Diabetes

Macular telangiectasia type 2 (MacTel2) is an uncommon, bilateral, and asymmetric condition that typically presents between the ages of 40 and 60 years without sex predilection.^1-9 Its estimated prevalence ranges from 0.02 to 0.10%.^2,8 The disease can manifest in either a nonproliferative or proliferative phase; the latter is far less common. The etiology of MacTel2 is poorly understood, but it is believed to have neurodegenerative as well as vascular components.^1-6,8-10 We present a case of MacTel2 and highlight the role of diagnostic imaging in early diagnosis prior to development of classic funduscopic features.

Case Presentation

A 66-year-old White male with a 10-year history of type 2 diabetes mellitus (T2DM) presented to the eye clinic for an annual eye examination. The patient was taking metformin, and 6 months prior to presentation, his hemoglobin A_1c was 7.4%. He had a history of mild nonproliferative diabetic retinopathy in the left eye without diabetic macular edema. He reported no ocular concerns.

On examination, best-corrected visual acuity (VA) was 20/20 in each eye. Slit-lamp examination was notable only for bilateral mild nuclear sclerosis. Dilated fundus examination showed a blunted foveal reflex consistent with the appearance of a macular pseudo-hole in the right eye and was unremarkable in the left eye (Figure 1).

Discussion

This case highlights several important management considerations in MacTel2. These include symptoms, disease stage, and diagnostic imaging, which can allow more precise staging of the disease.

The etiology of MacTel2 is unknown.⁶ It is believed to be primarily a neurodegenerative condition that damages Müller cells and photoreceptors, leading to vascular changes.^1-6,8-10 Müller cells may play a role in creating and maintaining the integrity of the blood-retinal barrier, particularly in the deep capillary plexus where the vascular abnormalities begin.^6,10 These early changes in the deep capillary plexus may evolve to include the superficial capillary plexus in intermediate stages with anastomoses forming between the 2 layers.^2,6-10 Late proliferative stages show significant alterations of the juxtafoveal capillary network, subretinal neovascularization and retinochoroidal anastomoses.^6,7,9,11 In one cohort study, 81% of patients with MacTel2 were White, and a genetic link is still under investigation.^2,4-9

Presentation

The most common symptoms of MacTel2 include blurred vision, microscotoma, metamorphopsia, and difficulty reading, with missing or distorted letters a common concern.^1,2,4-8 Best-corrected VA at presentation is usually better than 20/30, and disease progression tends to be slow.^2,6 Microscotomata are best mapped with microperimetry.^1-3,5-7

There are several classic fundus findings (Table). In the early stages, these findings are subtle or entirely absent funduscopically.^1,2,4-10 In intermediate stages, fundus findings become apparent and include a loss of retinal clarity (grayish perifoveal sheen), telangiectatic macular vessels, retinal pigment epithelium hypertrophy, blunted right-angled vessels, and superficial retinal crystalline deposits.^2,4-11 Right-angled vessels may have a greater association with choroidal neovascularization, with growth into the outer retina in particular being a marker of disease progression.⁹ The crystalline deposits have been hypothesized to be the footplates of degenerated Müller cells.⁶

Diagnostic Testing

Diagnostic retinal imaging is invaluable in the diagnosis of MacTel2. The OCT can detect hyporeflectivity within the ellipsoid zone in early disease corresponding to ellipsoid zone loss, which increases as the disease progresses.^1-8,10 This loss most often begins in the temporal parafoveal region and correlates with the progression of both relative and absolute scotomas perceived by affected individuals.^2,3,5,8

Intraretinal foveal hyporeflective spaces on the OCT represent cavity formation after Müller cell and photoreceptor loss and do not correlate with increased thickness.^1,2,4,6,7 This is important in differentiating from diabetic macular edema, which will often show thickening.⁶ In most cases of MacTel2, foveal thickness is decreased.^4-6 The ILM remains intact overlying this space and is referred to as ILM drape.^6,7 This can cause blunting or absence of the foveal light reflex and mimic the appearance of a macular pseudohole.⁴

The OCT-A allows visualization of capillary changes through every layer of the retina, which could not otherwise be appreciated, allowing early detection as well as precise staging of the disease.^2,6-10 Anastomoses present in late-stage disease also can be imaged using OCT-A.^7,9 These anastomoses can be seen as hyperreflective vasculature present between the retinal layers where there is little to no vasculature visible in normal eyes.⁷

A lesser-known occurrence in MacTel2 is the depletion of macular luteal pigment, with many eyes possessing an abnormal distribution.^2,4,6-8,10 This depletion and abnormal distribution can be visualized with FAF. In particular, short wavelength fundus autofluorescence (SW-FAF) is the most effective at highlighting these changes.¹⁰ The characteristic finding is a hyperreflective halo surrounding the fovea.^2,6 Fluorescence life imaging ophthalmoscopy (FLIO) is a recent development in FAF that measures FAF lifetime, which is the duration of time a structure autofluoresces.⁸ A cross-sectional study published in 2018 showed prolonged FAF lifetime in the temporal fovea of patients with early and moderate stage MacTel2 when compared with normal patients.⁸ More advanced stages showed a ring encircling the entire fovea.⁸

Classic FA findings in MacTel2 include early hyperfluorescence of temporal foveal telangiectatic capillaries and late-stage leakage with sparing of the central fovea.^1,2,4,6,7,11

Management and Prognosis

Management of MacTel2 depends on the stage of the disease. In the absence of proven treatment, management in nonproliferative stages is conservative.^2,6 Intravitreal anti-VEGF does not offer any benefit in nonproliferative disease.^2,5,6 Indeed, as VEGF may have a neuroprotective effect on the retina, anti-VEGF may result in more harm than benefit in earlier disease stages.⁵ In proliferative stages, intravitreal anti-VEGF can help limit scarring and prevent vision loss.^2,5

Long-term prognosis of MacTel2 is variable with VA typically better than 20/100.² Vision loss in MacTel2 most often begins paracentrally; it can then progress centrally, leading to significant reduction in VA.¹² The progression of this functional vision loss and corresponding structural damage is typically slow.³ VA worse than 20/100 is usually a result of proliferative disease; in such cases, there is potential for severe central vision loss and legal blindness.¹

Conclusions

This case of MacTel2 underscores the subtle retinal findings in the earliest stages of the disease and the importance of a complete retinal examination and diagnostic imaging with macula OCT, OCT-A, and FAF to establish the correct diagnosis.

Macular telangiectasia type 2 (MacTel2) is an uncommon, bilateral, and asymmetric condition that typically presents between the ages of 40 and 60 years without sex predilection.^1-9 Its estimated prevalence ranges from 0.02 to 0.10%.^2,8 The disease can manifest in either a nonproliferative or proliferative phase; the latter is far less common. The etiology of MacTel2 is poorly understood, but it is believed to have neurodegenerative as well as vascular components.^1-6,8-10 We present a case of MacTel2 and highlight the role of diagnostic imaging in early diagnosis prior to development of classic funduscopic features.

Case Presentation

A 66-year-old White male with a 10-year history of type 2 diabetes mellitus (T2DM) presented to the eye clinic for an annual eye examination. The patient was taking metformin, and 6 months prior to presentation, his hemoglobin A_1c was 7.4%. He had a history of mild nonproliferative diabetic retinopathy in the left eye without diabetic macular edema. He reported no ocular concerns.

On examination, best-corrected visual acuity (VA) was 20/20 in each eye. Slit-lamp examination was notable only for bilateral mild nuclear sclerosis. Dilated fundus examination showed a blunted foveal reflex consistent with the appearance of a macular pseudo-hole in the right eye and was unremarkable in the left eye (Figure 1).

Discussion

This case highlights several important management considerations in MacTel2. These include symptoms, disease stage, and diagnostic imaging, which can allow more precise staging of the disease.

The etiology of MacTel2 is unknown.⁶ It is believed to be primarily a neurodegenerative condition that damages Müller cells and photoreceptors, leading to vascular changes.^1-6,8-10 Müller cells may play a role in creating and maintaining the integrity of the blood-retinal barrier, particularly in the deep capillary plexus where the vascular abnormalities begin.^6,10 These early changes in the deep capillary plexus may evolve to include the superficial capillary plexus in intermediate stages with anastomoses forming between the 2 layers.^2,6-10 Late proliferative stages show significant alterations of the juxtafoveal capillary network, subretinal neovascularization and retinochoroidal anastomoses.^6,7,9,11 In one cohort study, 81% of patients with MacTel2 were White, and a genetic link is still under investigation.^2,4-9

Presentation

The most common symptoms of MacTel2 include blurred vision, microscotoma, metamorphopsia, and difficulty reading, with missing or distorted letters a common concern.^1,2,4-8 Best-corrected VA at presentation is usually better than 20/30, and disease progression tends to be slow.^2,6 Microscotomata are best mapped with microperimetry.^1-3,5-7

There are several classic fundus findings (Table). In the early stages, these findings are subtle or entirely absent funduscopically.^1,2,4-10 In intermediate stages, fundus findings become apparent and include a loss of retinal clarity (grayish perifoveal sheen), telangiectatic macular vessels, retinal pigment epithelium hypertrophy, blunted right-angled vessels, and superficial retinal crystalline deposits.^2,4-11 Right-angled vessels may have a greater association with choroidal neovascularization, with growth into the outer retina in particular being a marker of disease progression.⁹ The crystalline deposits have been hypothesized to be the footplates of degenerated Müller cells.⁶

Diagnostic Testing

Diagnostic retinal imaging is invaluable in the diagnosis of MacTel2. The OCT can detect hyporeflectivity within the ellipsoid zone in early disease corresponding to ellipsoid zone loss, which increases as the disease progresses.^1-8,10 This loss most often begins in the temporal parafoveal region and correlates with the progression of both relative and absolute scotomas perceived by affected individuals.^2,3,5,8

Intraretinal foveal hyporeflective spaces on the OCT represent cavity formation after Müller cell and photoreceptor loss and do not correlate with increased thickness.^1,2,4,6,7 This is important in differentiating from diabetic macular edema, which will often show thickening.⁶ In most cases of MacTel2, foveal thickness is decreased.^4-6 The ILM remains intact overlying this space and is referred to as ILM drape.^6,7 This can cause blunting or absence of the foveal light reflex and mimic the appearance of a macular pseudohole.⁴

The OCT-A allows visualization of capillary changes through every layer of the retina, which could not otherwise be appreciated, allowing early detection as well as precise staging of the disease.^2,6-10 Anastomoses present in late-stage disease also can be imaged using OCT-A.^7,9 These anastomoses can be seen as hyperreflective vasculature present between the retinal layers where there is little to no vasculature visible in normal eyes.⁷

A lesser-known occurrence in MacTel2 is the depletion of macular luteal pigment, with many eyes possessing an abnormal distribution.^2,4,6-8,10 This depletion and abnormal distribution can be visualized with FAF. In particular, short wavelength fundus autofluorescence (SW-FAF) is the most effective at highlighting these changes.¹⁰ The characteristic finding is a hyperreflective halo surrounding the fovea.^2,6 Fluorescence life imaging ophthalmoscopy (FLIO) is a recent development in FAF that measures FAF lifetime, which is the duration of time a structure autofluoresces.⁸ A cross-sectional study published in 2018 showed prolonged FAF lifetime in the temporal fovea of patients with early and moderate stage MacTel2 when compared with normal patients.⁸ More advanced stages showed a ring encircling the entire fovea.⁸

Classic FA findings in MacTel2 include early hyperfluorescence of temporal foveal telangiectatic capillaries and late-stage leakage with sparing of the central fovea.^1,2,4,6,7,11

Management and Prognosis

Management of MacTel2 depends on the stage of the disease. In the absence of proven treatment, management in nonproliferative stages is conservative.^2,6 Intravitreal anti-VEGF does not offer any benefit in nonproliferative disease.^2,5,6 Indeed, as VEGF may have a neuroprotective effect on the retina, anti-VEGF may result in more harm than benefit in earlier disease stages.⁵ In proliferative stages, intravitreal anti-VEGF can help limit scarring and prevent vision loss.^2,5

Long-term prognosis of MacTel2 is variable with VA typically better than 20/100.² Vision loss in MacTel2 most often begins paracentrally; it can then progress centrally, leading to significant reduction in VA.¹² The progression of this functional vision loss and corresponding structural damage is typically slow.³ VA worse than 20/100 is usually a result of proliferative disease; in such cases, there is potential for severe central vision loss and legal blindness.¹

Conclusions

This case of MacTel2 underscores the subtle retinal findings in the earliest stages of the disease and the importance of a complete retinal examination and diagnostic imaging with macula OCT, OCT-A, and FAF to establish the correct diagnosis.

Macular telangiectasia type 2 (MacTel2) is an uncommon, bilateral, and asymmetric condition that typically presents between the ages of 40 and 60 years without sex predilection.^1-9 Its estimated prevalence ranges from 0.02 to 0.10%.^2,8 The disease can manifest in either a nonproliferative or proliferative phase; the latter is far less common. The etiology of MacTel2 is poorly understood, but it is believed to have neurodegenerative as well as vascular components.^1-6,8-10 We present a case of MacTel2 and highlight the role of diagnostic imaging in early diagnosis prior to development of classic funduscopic features.

Case Presentation

A 66-year-old White male with a 10-year history of type 2 diabetes mellitus (T2DM) presented to the eye clinic for an annual eye examination. The patient was taking metformin, and 6 months prior to presentation, his hemoglobin A_1c was 7.4%. He had a history of mild nonproliferative diabetic retinopathy in the left eye without diabetic macular edema. He reported no ocular concerns.

On examination, best-corrected visual acuity (VA) was 20/20 in each eye. Slit-lamp examination was notable only for bilateral mild nuclear sclerosis. Dilated fundus examination showed a blunted foveal reflex consistent with the appearance of a macular pseudo-hole in the right eye and was unremarkable in the left eye (Figure 1).

Discussion

This case highlights several important management considerations in MacTel2. These include symptoms, disease stage, and diagnostic imaging, which can allow more precise staging of the disease.

The etiology of MacTel2 is unknown.⁶ It is believed to be primarily a neurodegenerative condition that damages Müller cells and photoreceptors, leading to vascular changes.^1-6,8-10 Müller cells may play a role in creating and maintaining the integrity of the blood-retinal barrier, particularly in the deep capillary plexus where the vascular abnormalities begin.^6,10 These early changes in the deep capillary plexus may evolve to include the superficial capillary plexus in intermediate stages with anastomoses forming between the 2 layers.^2,6-10 Late proliferative stages show significant alterations of the juxtafoveal capillary network, subretinal neovascularization and retinochoroidal anastomoses.^6,7,9,11 In one cohort study, 81% of patients with MacTel2 were White, and a genetic link is still under investigation.^2,4-9

Presentation

The most common symptoms of MacTel2 include blurred vision, microscotoma, metamorphopsia, and difficulty reading, with missing or distorted letters a common concern.^1,2,4-8 Best-corrected VA at presentation is usually better than 20/30, and disease progression tends to be slow.^2,6 Microscotomata are best mapped with microperimetry.^1-3,5-7

There are several classic fundus findings (Table). In the early stages, these findings are subtle or entirely absent funduscopically.^1,2,4-10 In intermediate stages, fundus findings become apparent and include a loss of retinal clarity (grayish perifoveal sheen), telangiectatic macular vessels, retinal pigment epithelium hypertrophy, blunted right-angled vessels, and superficial retinal crystalline deposits.^2,4-11 Right-angled vessels may have a greater association with choroidal neovascularization, with growth into the outer retina in particular being a marker of disease progression.⁹ The crystalline deposits have been hypothesized to be the footplates of degenerated Müller cells.⁶

Diagnostic Testing

Diagnostic retinal imaging is invaluable in the diagnosis of MacTel2. The OCT can detect hyporeflectivity within the ellipsoid zone in early disease corresponding to ellipsoid zone loss, which increases as the disease progresses.^1-8,10 This loss most often begins in the temporal parafoveal region and correlates with the progression of both relative and absolute scotomas perceived by affected individuals.^2,3,5,8

Intraretinal foveal hyporeflective spaces on the OCT represent cavity formation after Müller cell and photoreceptor loss and do not correlate with increased thickness.^1,2,4,6,7 This is important in differentiating from diabetic macular edema, which will often show thickening.⁶ In most cases of MacTel2, foveal thickness is decreased.^4-6 The ILM remains intact overlying this space and is referred to as ILM drape.^6,7 This can cause blunting or absence of the foveal light reflex and mimic the appearance of a macular pseudohole.⁴

The OCT-A allows visualization of capillary changes through every layer of the retina, which could not otherwise be appreciated, allowing early detection as well as precise staging of the disease.^2,6-10 Anastomoses present in late-stage disease also can be imaged using OCT-A.^7,9 These anastomoses can be seen as hyperreflective vasculature present between the retinal layers where there is little to no vasculature visible in normal eyes.⁷

A lesser-known occurrence in MacTel2 is the depletion of macular luteal pigment, with many eyes possessing an abnormal distribution.^2,4,6-8,10 This depletion and abnormal distribution can be visualized with FAF. In particular, short wavelength fundus autofluorescence (SW-FAF) is the most effective at highlighting these changes.¹⁰ The characteristic finding is a hyperreflective halo surrounding the fovea.^2,6 Fluorescence life imaging ophthalmoscopy (FLIO) is a recent development in FAF that measures FAF lifetime, which is the duration of time a structure autofluoresces.⁸ A cross-sectional study published in 2018 showed prolonged FAF lifetime in the temporal fovea of patients with early and moderate stage MacTel2 when compared with normal patients.⁸ More advanced stages showed a ring encircling the entire fovea.⁸

Classic FA findings in MacTel2 include early hyperfluorescence of temporal foveal telangiectatic capillaries and late-stage leakage with sparing of the central fovea.^1,2,4,6,7,11

Management and Prognosis

Management of MacTel2 depends on the stage of the disease. In the absence of proven treatment, management in nonproliferative stages is conservative.^2,6 Intravitreal anti-VEGF does not offer any benefit in nonproliferative disease.^2,5,6 Indeed, as VEGF may have a neuroprotective effect on the retina, anti-VEGF may result in more harm than benefit in earlier disease stages.⁵ In proliferative stages, intravitreal anti-VEGF can help limit scarring and prevent vision loss.^2,5

Long-term prognosis of MacTel2 is variable with VA typically better than 20/100.² Vision loss in MacTel2 most often begins paracentrally; it can then progress centrally, leading to significant reduction in VA.¹² The progression of this functional vision loss and corresponding structural damage is typically slow.³ VA worse than 20/100 is usually a result of proliferative disease; in such cases, there is potential for severe central vision loss and legal blindness.¹

Conclusions

This case of MacTel2 underscores the subtle retinal findings in the earliest stages of the disease and the importance of a complete retinal examination and diagnostic imaging with macula OCT, OCT-A, and FAF to establish the correct diagnosis.

One in 10 adults worldwide currently has diabetes, accounting for an estimated global health expenditure of $966 billion in U.S. dollars in 2021, according to the new International Diabetes Federation Diabetes Atlas.

The IDF Atlas, 10th edition, was published online Dec. 6, 2021.

Highlights from it were presented during two sessions at the IDF Virtual Congress 2021, covering global diabetes incidence and prevalence, mortality, and costs, as well as new sections in this edition devoted to adult-onset type 1 diabetes, childhood-onset type 2 diabetes, and the interactions between diabetes and COVID-19.

More detailed data from some of the Atlas chapters were also published Dec. 6, 2021, in separate papers in the IDF journal Diabetes Research and Clinical Practice, with more publications planned.

Information for the Atlas comes from peer-reviewed literature, unpublished reports, and national registries. This latest edition includes 219 data sources from 144 countries, with figures for other countries extrapolated.

Atlas cochair Dianna Magliano, PhD, reviewed some of the highlights. Half of those currently with diabetes, or about 240 million adults, are undiagnosed, and another 319 million have impaired fasting glucose. Over three-quarters of all adults with diabetes now live in low- and middle-income countries. And about 6.7 million deaths in 2021 can be attributed to diabetes.

The Atlas also predicts increases in these numbers over the coming decades if current trends continue.

“Our data and projections tell a sobering story. Diabetes prevalence is expected to increase globally. The number of adults with diabetes will rise from 537 million in 2021 to 786 million ... by the year 2045, an increase of 46%. Rises are expected in every region of the world, with the largest increases expected to occur in the regions of Africa, the Middle East, and Southeast Asia,” said Dr. Magliano, head of diabetes and population health at the Baker Heart and Diabetes Institute, Melbourne.

Since 2019, when the last Atlas was published, the 2021 numbers represent increases of 73.6 million more adults with diabetes including 7.8 million more undiagnosed, 2.5 million more deaths attributed to diabetes, and an additional global expenditure of $206 billion.

Increases have also occurred in the number of people with prediabetes, children with type 1 diabetes, and pregnancies affected by diabetes, Dr. Magliano reported.

“There is a strong need for effective intervention strategies and policies to stall the increase in the number of people developing diabetes across the world,” she added.
 

Projected rise in expenditures for diabetes will be ‘unsustainable’

The current $966 billion global health expenditure caused by diabetes represents a 316% increase from the $232 billion reported in 2006, according to William H. Herman, MD, professor of internal medicine and epidemiology at the University of Michigan, Ann Arbor.

By region, 43% of current diabetes-related global expenditures are in North America, 25% in the Western Pacific, and 20% in Europe, while 12% are from the regions of South and Central America, North Africa, Africa, and Southeast Asia combined, Herman said.

The direct costs of diabetes are projected to grow to $1054 billion in 2045, an increase of just 9% over 25 years. The reason for the far lower increase going forward, compared with the tripling in the 15 years prior, is because of the anticipated diabetes rise in regions of the world where per-person spending on diabetes is low, a situation Dr. Herman called “unsustainable.”

“The keys to controlling the global costs of diabetes care are diabetes prevention and providing effective care to the largest number of people at the lowest possible cost,” he said.
 

Diabetes-related mortality: Some shifts since 2019

One third of the current 6.7 million diabetes-related deaths in 2021 were in people younger than 60 years, said Elbert S. Huang, MD, professor of medicine and public health sciences at the University of Chicago.

Overall, diabetes accounted for 11.8% of total global deaths in people younger than 60 years, but that varied widely, from 24.5% in the Middle East/North Africa to just 6.9% in Southeast Asia.

The regions with the highest number of diabetes-related deaths in people younger than 60 years in 2021 were the Western Pacific and the Middle East/North Africa, a major change from just 2 years ago, when Southeast Asia and Africa saw the greatest numbers of diabetes-related deaths in working-age adults.

“These findings mirror recent reports on inadequate uptake of diabetes prevention programs as well as stagnant quality of care trends for the past decade and reemphasize the need to address noncommunicable diseases across the globe,” Dr. Huang said.
 

Diabetes and COVID-19: Other factors partly explain the increased risk

Gillian Booth, MD, summarized the current literature on COVID-19 and diabetes including a meta-analysis her group conducted of 300 studies from around the world, with 58% from high-income countries.

The risk for increased COVID-19 severity in people with diabetes could be at least partly explained by factors such as age, sex, and comorbidities, said Dr. Booth, professor in the department of medicine and the Institute of Health Policy, Management, and Evaluation at the University of Toronto.

For example, the unadjusted pooled odds of hospitalization with COVID-19 in patients with diabetes, compared with those without diabetes, was 3.69, but dropped to 1.73 after adjustment for age, sex, and having one or more comorbidities. For COVID-19–related death, those odds ratios were 2.32 unadjusted versus 1.59 adjusted. In both cases, the values were still significant after adjustment, she emphasized.

Overall, hyperglycemia and hemoglobin A1c at admission emerged as significant independent predictors of severe outcomes.

“Further research is needed to understand the interplay between COVID-19 and diabetes and how best to address the disproportionate burden of COVID-19 among people living with diabetes,” she stressed.
 

Adult-onset type 1 diabetes: Growing recognition of the burden

Ascertainment of data for both adult-onset type 1 and type 2 diabetes in youth was subject to significant limitations.

For adult-onset type 1 diabetes, Jessica Harding, PhD, pointed to the fact that the epidemiology of adult-onset type 1 diabetes hasn’t been well characterized because of the historical focus on children, the difficulty of distinguishing it from type 2 diabetes in adults, and that many registries simply don’t include incident data across the lifespan for type 1 diabetes.

Nonetheless, she said, “there is growing recognition of the burden of adult-onset type 1,” noting that the American Diabetes Association and European Association for the Study of Diabetes just published a consensus statement addressing the topic.

A systematic review of 46 studies representing 32 countries or regions revealed that countries with the highest incidence of type 1 diabetes onset per population of 100,000 ages 20 or above were Eritrea, at 46.2, followed by Sweden and Ireland, both at 30.6, and Finland, at 0. The lowest rates were in Asian countries.

While the Nordic countries (Finland, Sweden, and Norway) are among the top for incidence of both childhood-onset (0-14 years) and adult-onset type 1 diabetes, Eritrea isn’t even among the top 10 for childhood onset.

The unusual situation in Eritrea is the subject of current study but the reasons aren’t yet clear, noted Dr. Magliano, of Emory University, Atlanta, during the question-and-answer period.

And only seven studies, 15%, used biomarkers to determine type 1 diabetes status, suggesting “there is a pressing need to improve the quality and quantity of information on adult-onset type 1 diabetes, particularly in those low- and middle-income countries,” Dr. Harding said.
 

Type 2 diabetes in youth: A call for better data

When presenting the data for childhood-onset type 2 diabetes, Andrea Luk, MD, noted: “The onset of advanced complications during the most productive time of life has significant impact on individuals, communities, and health economies.”

In 19 studies, the highest reported prevalence of type 2 diabetes in youth was in Brazil, Mexico, indigenous populations of the United States and Canada, and the Black population in the United States, with rates ranging from 160 per 100,000 to 3300 per 100,000. The lowest prevalence rates of 0.6 per 100,000 to 2.7 per 100,000 were reported in Europe. Incidence data were similar, with the highest rates from 31 per 100,000 to 94 per 100,000 and the lowest 0.1 per 100,000 to 0.8 per 100,000 per year.  

Of note, Dr. Luk pointed out that childhood obesity is an important factor but not the only one.

“Some populations that have a low prevalence of obesity, such as East Asians, reported higher incidence rates of youth-onset type 2 diabetes than populations with a greater burden of childhood obesity.”

There was variability in incidence rates for youth of similar ethnic background but from different countries. “Apart from genetic predisposition and background obesogenic environment, disparity in socioeconomic status, access to health care, and cultural practices are other contributors to differences in risk of type 2 diabetes in youth,” noted Dr. Luk, associate professor in the division of endocrinology, Department of Medicine and Therapeutics, Chinese University of Hong Kong.

She also noted that the incidence of type 2 diabetes was extremely low in prepubertal children and rises gradually during puberty, and that the incidence is higher in girls than boys but that reverses in adulthood.

Compared with adults with type 2 diabetes, youth with type 2 diabetes had a more adverse glycemic trajectory and higher rates of metformin failure.

And compared with youth with type 1 diabetes, those with type 2 diabetes had more adverse metabolic profiles and higher rates of vascular complications.

“A strong call must be made for the collection of trend data to assess global burden of type 2 diabetes in youth,” she concluded.

Dr. Luk reported serving as an advisory panel member for and/or receiving research support from Amgen, AstraZeneca, Boehringer Ingelheim, Sanofi, the Asia Diabetes Foundation, Bayer, Lee’s Pharmaceutical, MSD, Novo Nordisk, Roche, Sugardown, and Takeda. The other authors reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

One in 10 adults worldwide currently has diabetes, accounting for an estimated global health expenditure of $966 billion in U.S. dollars in 2021, according to the new International Diabetes Federation Diabetes Atlas.

The IDF Atlas, 10th edition, was published online Dec. 6, 2021.

Highlights from it were presented during two sessions at the IDF Virtual Congress 2021, covering global diabetes incidence and prevalence, mortality, and costs, as well as new sections in this edition devoted to adult-onset type 1 diabetes, childhood-onset type 2 diabetes, and the interactions between diabetes and COVID-19.

More detailed data from some of the Atlas chapters were also published Dec. 6, 2021, in separate papers in the IDF journal Diabetes Research and Clinical Practice, with more publications planned.

Information for the Atlas comes from peer-reviewed literature, unpublished reports, and national registries. This latest edition includes 219 data sources from 144 countries, with figures for other countries extrapolated.

Atlas cochair Dianna Magliano, PhD, reviewed some of the highlights. Half of those currently with diabetes, or about 240 million adults, are undiagnosed, and another 319 million have impaired fasting glucose. Over three-quarters of all adults with diabetes now live in low- and middle-income countries. And about 6.7 million deaths in 2021 can be attributed to diabetes.

The Atlas also predicts increases in these numbers over the coming decades if current trends continue.

“Our data and projections tell a sobering story. Diabetes prevalence is expected to increase globally. The number of adults with diabetes will rise from 537 million in 2021 to 786 million ... by the year 2045, an increase of 46%. Rises are expected in every region of the world, with the largest increases expected to occur in the regions of Africa, the Middle East, and Southeast Asia,” said Dr. Magliano, head of diabetes and population health at the Baker Heart and Diabetes Institute, Melbourne.

Since 2019, when the last Atlas was published, the 2021 numbers represent increases of 73.6 million more adults with diabetes including 7.8 million more undiagnosed, 2.5 million more deaths attributed to diabetes, and an additional global expenditure of $206 billion.

Increases have also occurred in the number of people with prediabetes, children with type 1 diabetes, and pregnancies affected by diabetes, Dr. Magliano reported.

“There is a strong need for effective intervention strategies and policies to stall the increase in the number of people developing diabetes across the world,” she added.
 

Projected rise in expenditures for diabetes will be ‘unsustainable’

The current $966 billion global health expenditure caused by diabetes represents a 316% increase from the $232 billion reported in 2006, according to William H. Herman, MD, professor of internal medicine and epidemiology at the University of Michigan, Ann Arbor.

By region, 43% of current diabetes-related global expenditures are in North America, 25% in the Western Pacific, and 20% in Europe, while 12% are from the regions of South and Central America, North Africa, Africa, and Southeast Asia combined, Herman said.

The direct costs of diabetes are projected to grow to $1054 billion in 2045, an increase of just 9% over 25 years. The reason for the far lower increase going forward, compared with the tripling in the 15 years prior, is because of the anticipated diabetes rise in regions of the world where per-person spending on diabetes is low, a situation Dr. Herman called “unsustainable.”

“The keys to controlling the global costs of diabetes care are diabetes prevention and providing effective care to the largest number of people at the lowest possible cost,” he said.
 

Diabetes-related mortality: Some shifts since 2019

One third of the current 6.7 million diabetes-related deaths in 2021 were in people younger than 60 years, said Elbert S. Huang, MD, professor of medicine and public health sciences at the University of Chicago.

Overall, diabetes accounted for 11.8% of total global deaths in people younger than 60 years, but that varied widely, from 24.5% in the Middle East/North Africa to just 6.9% in Southeast Asia.

The regions with the highest number of diabetes-related deaths in people younger than 60 years in 2021 were the Western Pacific and the Middle East/North Africa, a major change from just 2 years ago, when Southeast Asia and Africa saw the greatest numbers of diabetes-related deaths in working-age adults.

“These findings mirror recent reports on inadequate uptake of diabetes prevention programs as well as stagnant quality of care trends for the past decade and reemphasize the need to address noncommunicable diseases across the globe,” Dr. Huang said.
 

Diabetes and COVID-19: Other factors partly explain the increased risk

Gillian Booth, MD, summarized the current literature on COVID-19 and diabetes including a meta-analysis her group conducted of 300 studies from around the world, with 58% from high-income countries.

The risk for increased COVID-19 severity in people with diabetes could be at least partly explained by factors such as age, sex, and comorbidities, said Dr. Booth, professor in the department of medicine and the Institute of Health Policy, Management, and Evaluation at the University of Toronto.

For example, the unadjusted pooled odds of hospitalization with COVID-19 in patients with diabetes, compared with those without diabetes, was 3.69, but dropped to 1.73 after adjustment for age, sex, and having one or more comorbidities. For COVID-19–related death, those odds ratios were 2.32 unadjusted versus 1.59 adjusted. In both cases, the values were still significant after adjustment, she emphasized.

Overall, hyperglycemia and hemoglobin A1c at admission emerged as significant independent predictors of severe outcomes.

“Further research is needed to understand the interplay between COVID-19 and diabetes and how best to address the disproportionate burden of COVID-19 among people living with diabetes,” she stressed.
 

Adult-onset type 1 diabetes: Growing recognition of the burden

Ascertainment of data for both adult-onset type 1 and type 2 diabetes in youth was subject to significant limitations.

For adult-onset type 1 diabetes, Jessica Harding, PhD, pointed to the fact that the epidemiology of adult-onset type 1 diabetes hasn’t been well characterized because of the historical focus on children, the difficulty of distinguishing it from type 2 diabetes in adults, and that many registries simply don’t include incident data across the lifespan for type 1 diabetes.

Nonetheless, she said, “there is growing recognition of the burden of adult-onset type 1,” noting that the American Diabetes Association and European Association for the Study of Diabetes just published a consensus statement addressing the topic.

A systematic review of 46 studies representing 32 countries or regions revealed that countries with the highest incidence of type 1 diabetes onset per population of 100,000 ages 20 or above were Eritrea, at 46.2, followed by Sweden and Ireland, both at 30.6, and Finland, at 0. The lowest rates were in Asian countries.

While the Nordic countries (Finland, Sweden, and Norway) are among the top for incidence of both childhood-onset (0-14 years) and adult-onset type 1 diabetes, Eritrea isn’t even among the top 10 for childhood onset.

The unusual situation in Eritrea is the subject of current study but the reasons aren’t yet clear, noted Dr. Magliano, of Emory University, Atlanta, during the question-and-answer period.

And only seven studies, 15%, used biomarkers to determine type 1 diabetes status, suggesting “there is a pressing need to improve the quality and quantity of information on adult-onset type 1 diabetes, particularly in those low- and middle-income countries,” Dr. Harding said.
 

Type 2 diabetes in youth: A call for better data

When presenting the data for childhood-onset type 2 diabetes, Andrea Luk, MD, noted: “The onset of advanced complications during the most productive time of life has significant impact on individuals, communities, and health economies.”

In 19 studies, the highest reported prevalence of type 2 diabetes in youth was in Brazil, Mexico, indigenous populations of the United States and Canada, and the Black population in the United States, with rates ranging from 160 per 100,000 to 3300 per 100,000. The lowest prevalence rates of 0.6 per 100,000 to 2.7 per 100,000 were reported in Europe. Incidence data were similar, with the highest rates from 31 per 100,000 to 94 per 100,000 and the lowest 0.1 per 100,000 to 0.8 per 100,000 per year.  

Of note, Dr. Luk pointed out that childhood obesity is an important factor but not the only one.

“Some populations that have a low prevalence of obesity, such as East Asians, reported higher incidence rates of youth-onset type 2 diabetes than populations with a greater burden of childhood obesity.”

There was variability in incidence rates for youth of similar ethnic background but from different countries. “Apart from genetic predisposition and background obesogenic environment, disparity in socioeconomic status, access to health care, and cultural practices are other contributors to differences in risk of type 2 diabetes in youth,” noted Dr. Luk, associate professor in the division of endocrinology, Department of Medicine and Therapeutics, Chinese University of Hong Kong.

She also noted that the incidence of type 2 diabetes was extremely low in prepubertal children and rises gradually during puberty, and that the incidence is higher in girls than boys but that reverses in adulthood.

Compared with adults with type 2 diabetes, youth with type 2 diabetes had a more adverse glycemic trajectory and higher rates of metformin failure.

And compared with youth with type 1 diabetes, those with type 2 diabetes had more adverse metabolic profiles and higher rates of vascular complications.

“A strong call must be made for the collection of trend data to assess global burden of type 2 diabetes in youth,” she concluded.

Dr. Luk reported serving as an advisory panel member for and/or receiving research support from Amgen, AstraZeneca, Boehringer Ingelheim, Sanofi, the Asia Diabetes Foundation, Bayer, Lee’s Pharmaceutical, MSD, Novo Nordisk, Roche, Sugardown, and Takeda. The other authors reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

One in 10 adults worldwide currently has diabetes, accounting for an estimated global health expenditure of $966 billion in U.S. dollars in 2021, according to the new International Diabetes Federation Diabetes Atlas.

The IDF Atlas, 10th edition, was published online Dec. 6, 2021.

Highlights from it were presented during two sessions at the IDF Virtual Congress 2021, covering global diabetes incidence and prevalence, mortality, and costs, as well as new sections in this edition devoted to adult-onset type 1 diabetes, childhood-onset type 2 diabetes, and the interactions between diabetes and COVID-19.

More detailed data from some of the Atlas chapters were also published Dec. 6, 2021, in separate papers in the IDF journal Diabetes Research and Clinical Practice, with more publications planned.

Information for the Atlas comes from peer-reviewed literature, unpublished reports, and national registries. This latest edition includes 219 data sources from 144 countries, with figures for other countries extrapolated.

Atlas cochair Dianna Magliano, PhD, reviewed some of the highlights. Half of those currently with diabetes, or about 240 million adults, are undiagnosed, and another 319 million have impaired fasting glucose. Over three-quarters of all adults with diabetes now live in low- and middle-income countries. And about 6.7 million deaths in 2021 can be attributed to diabetes.

The Atlas also predicts increases in these numbers over the coming decades if current trends continue.

“Our data and projections tell a sobering story. Diabetes prevalence is expected to increase globally. The number of adults with diabetes will rise from 537 million in 2021 to 786 million ... by the year 2045, an increase of 46%. Rises are expected in every region of the world, with the largest increases expected to occur in the regions of Africa, the Middle East, and Southeast Asia,” said Dr. Magliano, head of diabetes and population health at the Baker Heart and Diabetes Institute, Melbourne.

Since 2019, when the last Atlas was published, the 2021 numbers represent increases of 73.6 million more adults with diabetes including 7.8 million more undiagnosed, 2.5 million more deaths attributed to diabetes, and an additional global expenditure of $206 billion.

Increases have also occurred in the number of people with prediabetes, children with type 1 diabetes, and pregnancies affected by diabetes, Dr. Magliano reported.

“There is a strong need for effective intervention strategies and policies to stall the increase in the number of people developing diabetes across the world,” she added.
 

Projected rise in expenditures for diabetes will be ‘unsustainable’

The current $966 billion global health expenditure caused by diabetes represents a 316% increase from the $232 billion reported in 2006, according to William H. Herman, MD, professor of internal medicine and epidemiology at the University of Michigan, Ann Arbor.

By region, 43% of current diabetes-related global expenditures are in North America, 25% in the Western Pacific, and 20% in Europe, while 12% are from the regions of South and Central America, North Africa, Africa, and Southeast Asia combined, Herman said.

The direct costs of diabetes are projected to grow to $1054 billion in 2045, an increase of just 9% over 25 years. The reason for the far lower increase going forward, compared with the tripling in the 15 years prior, is because of the anticipated diabetes rise in regions of the world where per-person spending on diabetes is low, a situation Dr. Herman called “unsustainable.”

“The keys to controlling the global costs of diabetes care are diabetes prevention and providing effective care to the largest number of people at the lowest possible cost,” he said.
 

Diabetes-related mortality: Some shifts since 2019

One third of the current 6.7 million diabetes-related deaths in 2021 were in people younger than 60 years, said Elbert S. Huang, MD, professor of medicine and public health sciences at the University of Chicago.

Overall, diabetes accounted for 11.8% of total global deaths in people younger than 60 years, but that varied widely, from 24.5% in the Middle East/North Africa to just 6.9% in Southeast Asia.

The regions with the highest number of diabetes-related deaths in people younger than 60 years in 2021 were the Western Pacific and the Middle East/North Africa, a major change from just 2 years ago, when Southeast Asia and Africa saw the greatest numbers of diabetes-related deaths in working-age adults.

“These findings mirror recent reports on inadequate uptake of diabetes prevention programs as well as stagnant quality of care trends for the past decade and reemphasize the need to address noncommunicable diseases across the globe,” Dr. Huang said.
 

Diabetes and COVID-19: Other factors partly explain the increased risk

Gillian Booth, MD, summarized the current literature on COVID-19 and diabetes including a meta-analysis her group conducted of 300 studies from around the world, with 58% from high-income countries.

The risk for increased COVID-19 severity in people with diabetes could be at least partly explained by factors such as age, sex, and comorbidities, said Dr. Booth, professor in the department of medicine and the Institute of Health Policy, Management, and Evaluation at the University of Toronto.

For example, the unadjusted pooled odds of hospitalization with COVID-19 in patients with diabetes, compared with those without diabetes, was 3.69, but dropped to 1.73 after adjustment for age, sex, and having one or more comorbidities. For COVID-19–related death, those odds ratios were 2.32 unadjusted versus 1.59 adjusted. In both cases, the values were still significant after adjustment, she emphasized.

Overall, hyperglycemia and hemoglobin A1c at admission emerged as significant independent predictors of severe outcomes.

“Further research is needed to understand the interplay between COVID-19 and diabetes and how best to address the disproportionate burden of COVID-19 among people living with diabetes,” she stressed.
 

Adult-onset type 1 diabetes: Growing recognition of the burden

Ascertainment of data for both adult-onset type 1 and type 2 diabetes in youth was subject to significant limitations.

For adult-onset type 1 diabetes, Jessica Harding, PhD, pointed to the fact that the epidemiology of adult-onset type 1 diabetes hasn’t been well characterized because of the historical focus on children, the difficulty of distinguishing it from type 2 diabetes in adults, and that many registries simply don’t include incident data across the lifespan for type 1 diabetes.

Nonetheless, she said, “there is growing recognition of the burden of adult-onset type 1,” noting that the American Diabetes Association and European Association for the Study of Diabetes just published a consensus statement addressing the topic.

A systematic review of 46 studies representing 32 countries or regions revealed that countries with the highest incidence of type 1 diabetes onset per population of 100,000 ages 20 or above were Eritrea, at 46.2, followed by Sweden and Ireland, both at 30.6, and Finland, at 0. The lowest rates were in Asian countries.

While the Nordic countries (Finland, Sweden, and Norway) are among the top for incidence of both childhood-onset (0-14 years) and adult-onset type 1 diabetes, Eritrea isn’t even among the top 10 for childhood onset.

The unusual situation in Eritrea is the subject of current study but the reasons aren’t yet clear, noted Dr. Magliano, of Emory University, Atlanta, during the question-and-answer period.

And only seven studies, 15%, used biomarkers to determine type 1 diabetes status, suggesting “there is a pressing need to improve the quality and quantity of information on adult-onset type 1 diabetes, particularly in those low- and middle-income countries,” Dr. Harding said.
 

Type 2 diabetes in youth: A call for better data

When presenting the data for childhood-onset type 2 diabetes, Andrea Luk, MD, noted: “The onset of advanced complications during the most productive time of life has significant impact on individuals, communities, and health economies.”

In 19 studies, the highest reported prevalence of type 2 diabetes in youth was in Brazil, Mexico, indigenous populations of the United States and Canada, and the Black population in the United States, with rates ranging from 160 per 100,000 to 3300 per 100,000. The lowest prevalence rates of 0.6 per 100,000 to 2.7 per 100,000 were reported in Europe. Incidence data were similar, with the highest rates from 31 per 100,000 to 94 per 100,000 and the lowest 0.1 per 100,000 to 0.8 per 100,000 per year.  

Of note, Dr. Luk pointed out that childhood obesity is an important factor but not the only one.

“Some populations that have a low prevalence of obesity, such as East Asians, reported higher incidence rates of youth-onset type 2 diabetes than populations with a greater burden of childhood obesity.”

There was variability in incidence rates for youth of similar ethnic background but from different countries. “Apart from genetic predisposition and background obesogenic environment, disparity in socioeconomic status, access to health care, and cultural practices are other contributors to differences in risk of type 2 diabetes in youth,” noted Dr. Luk, associate professor in the division of endocrinology, Department of Medicine and Therapeutics, Chinese University of Hong Kong.

She also noted that the incidence of type 2 diabetes was extremely low in prepubertal children and rises gradually during puberty, and that the incidence is higher in girls than boys but that reverses in adulthood.

Compared with adults with type 2 diabetes, youth with type 2 diabetes had a more adverse glycemic trajectory and higher rates of metformin failure.

And compared with youth with type 1 diabetes, those with type 2 diabetes had more adverse metabolic profiles and higher rates of vascular complications.

“A strong call must be made for the collection of trend data to assess global burden of type 2 diabetes in youth,” she concluded.

Dr. Luk reported serving as an advisory panel member for and/or receiving research support from Amgen, AstraZeneca, Boehringer Ingelheim, Sanofi, the Asia Diabetes Foundation, Bayer, Lee’s Pharmaceutical, MSD, Novo Nordisk, Roche, Sugardown, and Takeda. The other authors reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

The recent Practice Alert by Dr. Campos-Outcalt, “How to proceed when it comes to vitamin D” (J Fam Pract. 2021;70:289-292) claimed that the value of vitamin D supplements for prevention is nil or still unknown.¹ Most of the references cited in support of this statement were centered on randomized controlled trials (RCTs) based on vitamin D dose rather than achieved 25-­hydroxyvitamin D [25(OH)D] concentration. Since the health effects of vitamin D supplementation are correlated with 25(OH)D concentration, the latter should be used to evaluate the results of vitamin D RCTs—a point I made in my 2018 article on the topic.²

For example, in the Vitamin D and Type 2 Diabetes (D2d) Study, in which participants in the treatment arm received 4000 IU/d vitamin D₃, there was no reduced rate of progression from prediabetes to diabetes. However, when 25(OH)D concentrations were analyzed for those in the vitamin D arm during the trial, the risk was found to be reduced by 25% (hazard ratio [HR] = 0.75; 95% CI, 0.68-0.82) per 10 ng/mL increase in 25(OH)D.³

There are significant benefits of vitamin D supplementation to achieve a 25(OH)D concentration of 30 to 60 ng/mL for important health outcomes.

Another trial, the Harvard-led VITamin D and OmegA-3 TriaL (VITAL), enrolled more than 25,000 participants, with the treatment arm receiving 2000 IU/d vitamin D₃.⁴ There were no significant reductions in incidence of either cancer or cardiovascular disease for the entire group. The mean baseline 25(OH)D concentration for those for whom values were provided was 31 ng/mL (32.2 ng/mL for White participants, 24.9 ng/mL for Black participants). However, there were ~25% reductions in cancer risk among Black participants (who had lower 25(OH)D concentrations than White participants) and those with a body mass index < 25. A posthoc analysis suggested a possible benefit related to the rate of total cancer deaths.

A recent article reported the results of long-term vitamin D supplementation among Veterans Health Administration patients who had an initial 25(OH)D concentration of < 20 ng/mL.⁵ For those who were treated with vitamin D and achieved a 25(OH)D concentration of > 30 ng/mL (compared to those who were untreated and had an average concentration of < 20 ng/mL), the risk of myocardial infarction was 27% lower (HR = 0.73; 95% CI, 0.55-0.96) and the risk of all-cause mortality was reduced by 39% (HR = 0.61; 95% CI, 0.56-0.67).

An analysis of SARS-CoV-2 positivity examined data for more than 190,000 patients in the United States who had serum 25(OH)D concentration measurements taken up to 1 year prior to their SARS-CoV-2 test. Positivity rates were 12.5% (95% CI, 12.2%-12.8%) for those with a 25(OH)D concentration < 20 ng/mL vs 5.9% (95% CI, 5.5%-6.4%) for those with a 25(OH)D concentration ≥55 ng/mL.⁶

Thus, there are significant benefits of vitamin D supplementation to achieve a 25(OH)D concentration of 30 to 60 ng/mL for important health outcomes.

Continue to: Author's Response

Author's response

I appreciate the letter from Dr. Grant in response to my previous Practice Alert, as it provides an opportunity to make some important points about assessment of scientific evidence and drawing conclusions based on sound methodology. There is an overabundance of scientific literature published, much of which is of questionable quality, meaning a “study” or 2 can be found to support any preconceived point of view.

In 2011, the Institute of Medicine (now the National Academy of Medicine) published a series of recommendations on how trustworthy recommendations and guidelines should be produced.^1,2 Key among the steps recommended is a full assessment of the totality of the literature on the subject by an independent, nonconflicted panel. This should be based on a systematic review that includes standard search methods to find all pertinent articles, an assessment of the quality of each study using standardized tools, and an overall assessment of the quality of the evidence. A high-quality systematic review meeting these standards was the basis for my review article on vitamin D.³

A “study” or 2 can be found to support any preconceived point of view.

To challenge the findings of the unproven benefits of vitamin D, Dr. Grant cited 4 studies to support the purported benefit of achieving a specific serum 25(OH)D level to prevent cardiovascular disease, diabetes, cancer, and COVID-19. After reading these studies, I would not consider any of them a “game changer.”

The first study was restricted to those with prediabetes, had limited follow-up (mean of 2.5 years), and found different results for those with the same 25(OH)D concentrations in the placebo and treatment groups.⁴ The second study was a large, well-conducted clinical trial that found no benefit of vitamin D supplementation in preventing cancer and cardiovascular disease.⁵ While Dr. Grant claims that benefits were found for some subgroups, I could locate only the statistics on cancer incidence in Black participants, and the confidence intervals showed no statistically significant benefit. It is always questionable to look at multiple outcomes in multiple subgroups without a prior hypothesis because of the likely occurrence of chance findings in so many comparisons. The third was a retrospective observational study with all the potential biases and challenges to validity that such studies present.⁶ A single study, especially 1 with observational methods, almost never conclusively settles a point.

The role of vitamin D in the prevention or treatment of COVID-19 is an aspect that was not covered in the systematic review by the US Preventive Services Task Force. The study on this issuecited by Dr. Grant was a large retrospective observational study that found an inverse relationship between serum 25(OH)D levels and SARS-CoV-2 positivity rates.⁷ This is 1 observational study with interesting results. However, I believe the conclusion of the National Institutes of Health is currently still the correct one: “There is insufficient evidence to recommend either for or against the use of vitamin D for the prevention or treatment of COVID-19.”⁸

With time and further research, Dr. Grant may eventually prove to be correct on specific points. However, when challenging a high-quality systematic review, one must assess the quality of the studies used while also placing them in context of the totality of the literature.

Doug Campos-Outcalt, MD, MPA
Phoenix, AZ

References

1. Institute of Medicine. Finding What Works in Health Care. The National Academy Press, 2011.

2. Institute of Medicine. Clinical Practice Guidelines We Can Trust. The National Academy Press, 2011.

3. Kahwati LC, LeBlanc E, Weber RP, et al. Screening for vitamin D deficiency in adults; updated evidence report and systematic review for the US Preventive Services Task Force. JAMA. 2021;325:1443-1463. doi: 10.1001/jama.2020.26498

4. Dawson-Hughes B, Staten MA, Knowler WC, et al. Intratrial exposure to vitamin D and new-onset diabetes among adults with prediabetes: a secondary analysis from the Vitamin D and Type 2 Diabetes (D2d) Study. Diabetes Care. 2020;43:2916-2922. doi: 10.2337/dc20-1765

5. Manson JE, Cook NR, Lee I-M, et al. Vitamin D supplements and prevention of cancer and cardiovascular disease. N Engl J Med. 2019;380:33-44. doi: 10.1056/NEJMoa1809944

6. Acharya P, Dalia T, Ranka S, et al. The effects of vitamin D supplementation and 25-hydroxyvitamin D levels on the risk of myocardial infarction and mortality. J Endocr Soc. 2021;5:bvab124. doi: 10.1210/jendso/bvab124

7. Kaufman HW, Niles JK, Kroll MH, et al. SARS-CoV-2 positivity rates associated with circulating 25-hydroxyvitamin D levels. PLoS One. 2020;15:e0239252. doi: 10.1371/journal.pone.0239252

8. National Institutes of Health. Vitamin D. COVID-19 treatment guidelines. Updated April 21, 2021. Accessed November 18, 2021. www.covid19treatmentguidelines.nih.gov/therapies/supplements/vitamin-d/

The recent Practice Alert by Dr. Campos-Outcalt, “How to proceed when it comes to vitamin D” (J Fam Pract. 2021;70:289-292) claimed that the value of vitamin D supplements for prevention is nil or still unknown.¹ Most of the references cited in support of this statement were centered on randomized controlled trials (RCTs) based on vitamin D dose rather than achieved 25-­hydroxyvitamin D [25(OH)D] concentration. Since the health effects of vitamin D supplementation are correlated with 25(OH)D concentration, the latter should be used to evaluate the results of vitamin D RCTs—a point I made in my 2018 article on the topic.²

For example, in the Vitamin D and Type 2 Diabetes (D2d) Study, in which participants in the treatment arm received 4000 IU/d vitamin D₃, there was no reduced rate of progression from prediabetes to diabetes. However, when 25(OH)D concentrations were analyzed for those in the vitamin D arm during the trial, the risk was found to be reduced by 25% (hazard ratio [HR] = 0.75; 95% CI, 0.68-0.82) per 10 ng/mL increase in 25(OH)D.³

There are significant benefits of vitamin D supplementation to achieve a 25(OH)D concentration of 30 to 60 ng/mL for important health outcomes.

Another trial, the Harvard-led VITamin D and OmegA-3 TriaL (VITAL), enrolled more than 25,000 participants, with the treatment arm receiving 2000 IU/d vitamin D₃.⁴ There were no significant reductions in incidence of either cancer or cardiovascular disease for the entire group. The mean baseline 25(OH)D concentration for those for whom values were provided was 31 ng/mL (32.2 ng/mL for White participants, 24.9 ng/mL for Black participants). However, there were ~25% reductions in cancer risk among Black participants (who had lower 25(OH)D concentrations than White participants) and those with a body mass index < 25. A posthoc analysis suggested a possible benefit related to the rate of total cancer deaths.

A recent article reported the results of long-term vitamin D supplementation among Veterans Health Administration patients who had an initial 25(OH)D concentration of < 20 ng/mL.⁵ For those who were treated with vitamin D and achieved a 25(OH)D concentration of > 30 ng/mL (compared to those who were untreated and had an average concentration of < 20 ng/mL), the risk of myocardial infarction was 27% lower (HR = 0.73; 95% CI, 0.55-0.96) and the risk of all-cause mortality was reduced by 39% (HR = 0.61; 95% CI, 0.56-0.67).

An analysis of SARS-CoV-2 positivity examined data for more than 190,000 patients in the United States who had serum 25(OH)D concentration measurements taken up to 1 year prior to their SARS-CoV-2 test. Positivity rates were 12.5% (95% CI, 12.2%-12.8%) for those with a 25(OH)D concentration < 20 ng/mL vs 5.9% (95% CI, 5.5%-6.4%) for those with a 25(OH)D concentration ≥55 ng/mL.⁶

Thus, there are significant benefits of vitamin D supplementation to achieve a 25(OH)D concentration of 30 to 60 ng/mL for important health outcomes.

Continue to: Author's Response

Author's response

I appreciate the letter from Dr. Grant in response to my previous Practice Alert, as it provides an opportunity to make some important points about assessment of scientific evidence and drawing conclusions based on sound methodology. There is an overabundance of scientific literature published, much of which is of questionable quality, meaning a “study” or 2 can be found to support any preconceived point of view.

In 2011, the Institute of Medicine (now the National Academy of Medicine) published a series of recommendations on how trustworthy recommendations and guidelines should be produced.^1,2 Key among the steps recommended is a full assessment of the totality of the literature on the subject by an independent, nonconflicted panel. This should be based on a systematic review that includes standard search methods to find all pertinent articles, an assessment of the quality of each study using standardized tools, and an overall assessment of the quality of the evidence. A high-quality systematic review meeting these standards was the basis for my review article on vitamin D.³

A “study” or 2 can be found to support any preconceived point of view.

To challenge the findings of the unproven benefits of vitamin D, Dr. Grant cited 4 studies to support the purported benefit of achieving a specific serum 25(OH)D level to prevent cardiovascular disease, diabetes, cancer, and COVID-19. After reading these studies, I would not consider any of them a “game changer.”

The first study was restricted to those with prediabetes, had limited follow-up (mean of 2.5 years), and found different results for those with the same 25(OH)D concentrations in the placebo and treatment groups.⁴ The second study was a large, well-conducted clinical trial that found no benefit of vitamin D supplementation in preventing cancer and cardiovascular disease.⁵ While Dr. Grant claims that benefits were found for some subgroups, I could locate only the statistics on cancer incidence in Black participants, and the confidence intervals showed no statistically significant benefit. It is always questionable to look at multiple outcomes in multiple subgroups without a prior hypothesis because of the likely occurrence of chance findings in so many comparisons. The third was a retrospective observational study with all the potential biases and challenges to validity that such studies present.⁶ A single study, especially 1 with observational methods, almost never conclusively settles a point.

The role of vitamin D in the prevention or treatment of COVID-19 is an aspect that was not covered in the systematic review by the US Preventive Services Task Force. The study on this issuecited by Dr. Grant was a large retrospective observational study that found an inverse relationship between serum 25(OH)D levels and SARS-CoV-2 positivity rates.⁷ This is 1 observational study with interesting results. However, I believe the conclusion of the National Institutes of Health is currently still the correct one: “There is insufficient evidence to recommend either for or against the use of vitamin D for the prevention or treatment of COVID-19.”⁸

With time and further research, Dr. Grant may eventually prove to be correct on specific points. However, when challenging a high-quality systematic review, one must assess the quality of the studies used while also placing them in context of the totality of the literature.

Doug Campos-Outcalt, MD, MPA
Phoenix, AZ

References

1. Institute of Medicine. Finding What Works in Health Care. The National Academy Press, 2011.

2. Institute of Medicine. Clinical Practice Guidelines We Can Trust. The National Academy Press, 2011.

3. Kahwati LC, LeBlanc E, Weber RP, et al. Screening for vitamin D deficiency in adults; updated evidence report and systematic review for the US Preventive Services Task Force. JAMA. 2021;325:1443-1463. doi: 10.1001/jama.2020.26498

4. Dawson-Hughes B, Staten MA, Knowler WC, et al. Intratrial exposure to vitamin D and new-onset diabetes among adults with prediabetes: a secondary analysis from the Vitamin D and Type 2 Diabetes (D2d) Study. Diabetes Care. 2020;43:2916-2922. doi: 10.2337/dc20-1765

5. Manson JE, Cook NR, Lee I-M, et al. Vitamin D supplements and prevention of cancer and cardiovascular disease. N Engl J Med. 2019;380:33-44. doi: 10.1056/NEJMoa1809944

6. Acharya P, Dalia T, Ranka S, et al. The effects of vitamin D supplementation and 25-hydroxyvitamin D levels on the risk of myocardial infarction and mortality. J Endocr Soc. 2021;5:bvab124. doi: 10.1210/jendso/bvab124

7. Kaufman HW, Niles JK, Kroll MH, et al. SARS-CoV-2 positivity rates associated with circulating 25-hydroxyvitamin D levels. PLoS One. 2020;15:e0239252. doi: 10.1371/journal.pone.0239252

8. National Institutes of Health. Vitamin D. COVID-19 treatment guidelines. Updated April 21, 2021. Accessed November 18, 2021. www.covid19treatmentguidelines.nih.gov/therapies/supplements/vitamin-d/

The recent Practice Alert by Dr. Campos-Outcalt, “How to proceed when it comes to vitamin D” (J Fam Pract. 2021;70:289-292) claimed that the value of vitamin D supplements for prevention is nil or still unknown.¹ Most of the references cited in support of this statement were centered on randomized controlled trials (RCTs) based on vitamin D dose rather than achieved 25-­hydroxyvitamin D [25(OH)D] concentration. Since the health effects of vitamin D supplementation are correlated with 25(OH)D concentration, the latter should be used to evaluate the results of vitamin D RCTs—a point I made in my 2018 article on the topic.²

For example, in the Vitamin D and Type 2 Diabetes (D2d) Study, in which participants in the treatment arm received 4000 IU/d vitamin D₃, there was no reduced rate of progression from prediabetes to diabetes. However, when 25(OH)D concentrations were analyzed for those in the vitamin D arm during the trial, the risk was found to be reduced by 25% (hazard ratio [HR] = 0.75; 95% CI, 0.68-0.82) per 10 ng/mL increase in 25(OH)D.³

There are significant benefits of vitamin D supplementation to achieve a 25(OH)D concentration of 30 to 60 ng/mL for important health outcomes.

Another trial, the Harvard-led VITamin D and OmegA-3 TriaL (VITAL), enrolled more than 25,000 participants, with the treatment arm receiving 2000 IU/d vitamin D₃.⁴ There were no significant reductions in incidence of either cancer or cardiovascular disease for the entire group. The mean baseline 25(OH)D concentration for those for whom values were provided was 31 ng/mL (32.2 ng/mL for White participants, 24.9 ng/mL for Black participants). However, there were ~25% reductions in cancer risk among Black participants (who had lower 25(OH)D concentrations than White participants) and those with a body mass index < 25. A posthoc analysis suggested a possible benefit related to the rate of total cancer deaths.

A recent article reported the results of long-term vitamin D supplementation among Veterans Health Administration patients who had an initial 25(OH)D concentration of < 20 ng/mL.⁵ For those who were treated with vitamin D and achieved a 25(OH)D concentration of > 30 ng/mL (compared to those who were untreated and had an average concentration of < 20 ng/mL), the risk of myocardial infarction was 27% lower (HR = 0.73; 95% CI, 0.55-0.96) and the risk of all-cause mortality was reduced by 39% (HR = 0.61; 95% CI, 0.56-0.67).

An analysis of SARS-CoV-2 positivity examined data for more than 190,000 patients in the United States who had serum 25(OH)D concentration measurements taken up to 1 year prior to their SARS-CoV-2 test. Positivity rates were 12.5% (95% CI, 12.2%-12.8%) for those with a 25(OH)D concentration < 20 ng/mL vs 5.9% (95% CI, 5.5%-6.4%) for those with a 25(OH)D concentration ≥55 ng/mL.⁶

Thus, there are significant benefits of vitamin D supplementation to achieve a 25(OH)D concentration of 30 to 60 ng/mL for important health outcomes.

Continue to: Author's Response

Author's response

I appreciate the letter from Dr. Grant in response to my previous Practice Alert, as it provides an opportunity to make some important points about assessment of scientific evidence and drawing conclusions based on sound methodology. There is an overabundance of scientific literature published, much of which is of questionable quality, meaning a “study” or 2 can be found to support any preconceived point of view.

In 2011, the Institute of Medicine (now the National Academy of Medicine) published a series of recommendations on how trustworthy recommendations and guidelines should be produced.^1,2 Key among the steps recommended is a full assessment of the totality of the literature on the subject by an independent, nonconflicted panel. This should be based on a systematic review that includes standard search methods to find all pertinent articles, an assessment of the quality of each study using standardized tools, and an overall assessment of the quality of the evidence. A high-quality systematic review meeting these standards was the basis for my review article on vitamin D.³

A “study” or 2 can be found to support any preconceived point of view.

To challenge the findings of the unproven benefits of vitamin D, Dr. Grant cited 4 studies to support the purported benefit of achieving a specific serum 25(OH)D level to prevent cardiovascular disease, diabetes, cancer, and COVID-19. After reading these studies, I would not consider any of them a “game changer.”

The first study was restricted to those with prediabetes, had limited follow-up (mean of 2.5 years), and found different results for those with the same 25(OH)D concentrations in the placebo and treatment groups.⁴ The second study was a large, well-conducted clinical trial that found no benefit of vitamin D supplementation in preventing cancer and cardiovascular disease.⁵ While Dr. Grant claims that benefits were found for some subgroups, I could locate only the statistics on cancer incidence in Black participants, and the confidence intervals showed no statistically significant benefit. It is always questionable to look at multiple outcomes in multiple subgroups without a prior hypothesis because of the likely occurrence of chance findings in so many comparisons. The third was a retrospective observational study with all the potential biases and challenges to validity that such studies present.⁶ A single study, especially 1 with observational methods, almost never conclusively settles a point.

The role of vitamin D in the prevention or treatment of COVID-19 is an aspect that was not covered in the systematic review by the US Preventive Services Task Force. The study on this issuecited by Dr. Grant was a large retrospective observational study that found an inverse relationship between serum 25(OH)D levels and SARS-CoV-2 positivity rates.⁷ This is 1 observational study with interesting results. However, I believe the conclusion of the National Institutes of Health is currently still the correct one: “There is insufficient evidence to recommend either for or against the use of vitamin D for the prevention or treatment of COVID-19.”⁸

With time and further research, Dr. Grant may eventually prove to be correct on specific points. However, when challenging a high-quality systematic review, one must assess the quality of the studies used while also placing them in context of the totality of the literature.

Doug Campos-Outcalt, MD, MPA
Phoenix, AZ

References

1. Institute of Medicine. Finding What Works in Health Care. The National Academy Press, 2011.

2. Institute of Medicine. Clinical Practice Guidelines We Can Trust. The National Academy Press, 2011.

3. Kahwati LC, LeBlanc E, Weber RP, et al. Screening for vitamin D deficiency in adults; updated evidence report and systematic review for the US Preventive Services Task Force. JAMA. 2021;325:1443-1463. doi: 10.1001/jama.2020.26498

4. Dawson-Hughes B, Staten MA, Knowler WC, et al. Intratrial exposure to vitamin D and new-onset diabetes among adults with prediabetes: a secondary analysis from the Vitamin D and Type 2 Diabetes (D2d) Study. Diabetes Care. 2020;43:2916-2922. doi: 10.2337/dc20-1765

5. Manson JE, Cook NR, Lee I-M, et al. Vitamin D supplements and prevention of cancer and cardiovascular disease. N Engl J Med. 2019;380:33-44. doi: 10.1056/NEJMoa1809944

6. Acharya P, Dalia T, Ranka S, et al. The effects of vitamin D supplementation and 25-hydroxyvitamin D levels on the risk of myocardial infarction and mortality. J Endocr Soc. 2021;5:bvab124. doi: 10.1210/jendso/bvab124

7. Kaufman HW, Niles JK, Kroll MH, et al. SARS-CoV-2 positivity rates associated with circulating 25-hydroxyvitamin D levels. PLoS One. 2020;15:e0239252. doi: 10.1371/journal.pone.0239252

8. National Institutes of Health. Vitamin D. COVID-19 treatment guidelines. Updated April 21, 2021. Accessed November 18, 2021. www.covid19treatmentguidelines.nih.gov/therapies/supplements/vitamin-d/

A 73-year-old man with longstanding, poorly controlled type 1 diabetes (T1D) and worsening paresthesia presented to the dermatology clinic following a painless thermal burn of his fingertips from holding a hot cup of coffee. The patient’s paresthesia in a stocking-and-glove distribution was attributable to diabetes-associated polyneuropathy. Two years prior, he had been diagnosed with mildly symptomatic, diabetes-associated scleredema of his upper back and treated with topical corticosteroids.

Physical examination revealed tense bullae on the pads of all 5 digits of his right hand (FIGURE 1). Localized, waxy tightening of the skin was noted on all digits of both hands, along with mild tethering of thickened skin on the right palm.

WHAT IS YOUR DIAGNOSIS?
HOW WOULD YOU TREAT THIS PATIENT?

 

 

Diagnosis: Diabetic hand syndrome

Subtle, early signs of diabetic sclerodactyly and Dupuytren contracture (DC) were observed in the context of an existing diagnosis of T1D, leading to a diagnosis of diabetic hand syndrome.

Sclerodactyly, a thickening and tightening of the skin, is a characteristic component of limited and systemic sclerosis. Sclerodactyly is not commonly observed in association with type 1 and type 2 diabetes; however, when it does occur, it is typically found in patients who have had uncontrolled diabetes for some time.^1-3 (In the context of diabetes, this skin manifestation is known as pseudoscleroderma and scleredema diabeticorum.) In 1 study of 238 patients with T1D, the prevalence of this diabetes manifestation was 39%, with a range of 10% to 50% also reported.³

Diabetic hand syndrome is an umbrella term for the constellation of debilitating fibroproliferative sequelae of the hand rendered by diabetes.³ In addition to diabetic sclerodactyly, diabetic hand syndrome includes limited joint mobility (LJM), or diabetic cheiroarthropathy, which typically manifests with either the “prayer sign” (the inability of the palms to obtain full approximation while the wrists are maximally flexed) or the “tabletop sign” (the inability of the palm to flatten completely against the surface of a table) (FIGURE 2).^4,5 The prevalence of LJM has been reported to range from 8% to 50% of patients diagnosed with longstanding, uncontrolled diabetes.⁴

Other musculoskeletal abnormalities seen in this syndrome include: DC, often found clinically as a palpable palmar nodule that ultimately results in a flexion contracture of the affected finger; stenosing tenosynovitis, or trigger finger, in which a reproducible locking phenomenon occurs on flexion of a finger, typically in the first, third, and fourth digits; and carpal tunnel syndrome, a median nerve entrapment neuropathy that results in pain and/or paresthesia over the thumb, index, middle, and lateral half of the ring fingers.^3-5

Secondary symptoms can signal long-term degenerative disease

Stocking-and-glove distribution polyneuropathy with deterioration of tactile sensation is a common sequela of diabetes, especially as disease severity progresses.² Although the exact pathogenesis remains unclear, it has been proposed that both diabetic polyneuropathy and increased skin thickness occur secondary to long-term degenerative microvascular disease.

Continue to: Specifically, prolonged...

Specifically, prolonged hyperglycemia and secondary chronic inflammation set the stage for protein glycation, with formation of advanced glycation end products (AGEs). It is thought that these AGEs in cutaneous and connective tissues stiffen collagen, leading to scleroderma-like skin changes.²

These microvascular and fibroproliferative changes are also considered important contributors in the etiology of DC and trigger finger, ultimately leading to increased collagen deposition and fascial thickening.^4,5 In addition, increased activation of the polyol pathway may occur secondary to hyperglycemia, resulting in increased intracellular water and cellular edema.⁵

The differential is comprisedof components of systemic disease

The differential diagnosis includes tropical diabetic hand, autoimmune-related scleroderma (also called systemic sclerosis), complex regional pain syndrome, and diabetic scleredema.

Tropical diabetic hand, a potentially dangerous infection, is generally found only in tropical regions and in the setting of injury.^5,6

Autoimmune-related scleroderma may be diagnosed alongside other signs and symptoms of CREST: calcinosis, Raynaud phenomenon, esophageal dysmotility, sclerodactyly, and telangiectasia. In the absence of other signs and symptoms, and in the presence of uncontrolled diabetes, biopsy would be needed to definitively diagnose it. Clinically, diabetic hand can be distinguished with concurrent involvement of the upper back.

Continue to: Complex regional pain syndrome

Complex regional pain syndrome is characterized by chronic, disabling pain, swelling, and motor impairment that frequently affect the hand, often secondary to surgery or trauma.^5,7 This diagnosis differs from the generally painless skin hardening of diabetic hand.

The co-existence of diabetic scleredema and diabetic sclerodactyly has been previously reported, although the onset of each condition is often temporally distinct.⁸ In contrast to diabetic sclerodactyly, the firm indurated skin characteristic of diabetic scleredema (which our patient had) initially involves the shoulders and neck and may progress over the trunk, including the upper back, typically sparing the distal extremities. Of note, the dermis in scleredema is thickened with marked deposition of mucopolysaccharide.⁹

Glycemic control is paramount

Studies of patients with diabetes who have thick, waxy skin and LJM have shown that tight glycemic control may reduce skin thickness and palmar fascia fibrosis.^3,5,9 Thus, in this patient with poorly controlled T1D, diabetic sclerodactyly, early DC, and second-degree burns attributable to advanced polyneuropathy, tightened glycemic control is logical and warranted. Such control could potentially impact the trajectory and morbidity of skin and musculoskeletal manifestations in this broad-reaching disease.

The diabetic milieu necessitates clinicians’ close attention to patients’ hands.

Although there are limited treatments for mobility-related symptoms of diabetic hand syndrome, physiotherapy is recommended in more severe stages of disease to increase joint range of motion.^4,5 More severe cases of DC and trigger finger have been successfully treated with topical steroids, corticosteroid injections, and surgery.^4,5 Simply stated—and in line with compulsive foot care—the diabetic milieu necessitates clinicians’ close attention to the hands. Components of diabetic hand, LJM, DC, or trigger finger may indicate a need to screen not only for diabetes in a patient previously undiagnosed but also, importantly, for other sequelae of diabetes, including retinopathy.^4,5

Our patient was treated with a ­moderate-potency topical steroid, triamcinolone 0.1% cream, and was advised to continue optimizing glycemic control with the aid of his primary care physician. It was unclear whether the patient improved with use, as he was lost to follow-up.

A 73-year-old man with longstanding, poorly controlled type 1 diabetes (T1D) and worsening paresthesia presented to the dermatology clinic following a painless thermal burn of his fingertips from holding a hot cup of coffee. The patient’s paresthesia in a stocking-and-glove distribution was attributable to diabetes-associated polyneuropathy. Two years prior, he had been diagnosed with mildly symptomatic, diabetes-associated scleredema of his upper back and treated with topical corticosteroids.

Physical examination revealed tense bullae on the pads of all 5 digits of his right hand (FIGURE 1). Localized, waxy tightening of the skin was noted on all digits of both hands, along with mild tethering of thickened skin on the right palm.

WHAT IS YOUR DIAGNOSIS?
HOW WOULD YOU TREAT THIS PATIENT?

 

 

Diagnosis: Diabetic hand syndrome

Subtle, early signs of diabetic sclerodactyly and Dupuytren contracture (DC) were observed in the context of an existing diagnosis of T1D, leading to a diagnosis of diabetic hand syndrome.

Sclerodactyly, a thickening and tightening of the skin, is a characteristic component of limited and systemic sclerosis. Sclerodactyly is not commonly observed in association with type 1 and type 2 diabetes; however, when it does occur, it is typically found in patients who have had uncontrolled diabetes for some time.^1-3 (In the context of diabetes, this skin manifestation is known as pseudoscleroderma and scleredema diabeticorum.) In 1 study of 238 patients with T1D, the prevalence of this diabetes manifestation was 39%, with a range of 10% to 50% also reported.³

Diabetic hand syndrome is an umbrella term for the constellation of debilitating fibroproliferative sequelae of the hand rendered by diabetes.³ In addition to diabetic sclerodactyly, diabetic hand syndrome includes limited joint mobility (LJM), or diabetic cheiroarthropathy, which typically manifests with either the “prayer sign” (the inability of the palms to obtain full approximation while the wrists are maximally flexed) or the “tabletop sign” (the inability of the palm to flatten completely against the surface of a table) (FIGURE 2).^4,5 The prevalence of LJM has been reported to range from 8% to 50% of patients diagnosed with longstanding, uncontrolled diabetes.⁴

Other musculoskeletal abnormalities seen in this syndrome include: DC, often found clinically as a palpable palmar nodule that ultimately results in a flexion contracture of the affected finger; stenosing tenosynovitis, or trigger finger, in which a reproducible locking phenomenon occurs on flexion of a finger, typically in the first, third, and fourth digits; and carpal tunnel syndrome, a median nerve entrapment neuropathy that results in pain and/or paresthesia over the thumb, index, middle, and lateral half of the ring fingers.^3-5

Secondary symptoms can signal long-term degenerative disease

Stocking-and-glove distribution polyneuropathy with deterioration of tactile sensation is a common sequela of diabetes, especially as disease severity progresses.² Although the exact pathogenesis remains unclear, it has been proposed that both diabetic polyneuropathy and increased skin thickness occur secondary to long-term degenerative microvascular disease.

Continue to: Specifically, prolonged...

Specifically, prolonged hyperglycemia and secondary chronic inflammation set the stage for protein glycation, with formation of advanced glycation end products (AGEs). It is thought that these AGEs in cutaneous and connective tissues stiffen collagen, leading to scleroderma-like skin changes.²

These microvascular and fibroproliferative changes are also considered important contributors in the etiology of DC and trigger finger, ultimately leading to increased collagen deposition and fascial thickening.^4,5 In addition, increased activation of the polyol pathway may occur secondary to hyperglycemia, resulting in increased intracellular water and cellular edema.⁵

The differential is comprisedof components of systemic disease

The differential diagnosis includes tropical diabetic hand, autoimmune-related scleroderma (also called systemic sclerosis), complex regional pain syndrome, and diabetic scleredema.

Tropical diabetic hand, a potentially dangerous infection, is generally found only in tropical regions and in the setting of injury.^5,6

Autoimmune-related scleroderma may be diagnosed alongside other signs and symptoms of CREST: calcinosis, Raynaud phenomenon, esophageal dysmotility, sclerodactyly, and telangiectasia. In the absence of other signs and symptoms, and in the presence of uncontrolled diabetes, biopsy would be needed to definitively diagnose it. Clinically, diabetic hand can be distinguished with concurrent involvement of the upper back.

Continue to: Complex regional pain syndrome

Complex regional pain syndrome is characterized by chronic, disabling pain, swelling, and motor impairment that frequently affect the hand, often secondary to surgery or trauma.^5,7 This diagnosis differs from the generally painless skin hardening of diabetic hand.

The co-existence of diabetic scleredema and diabetic sclerodactyly has been previously reported, although the onset of each condition is often temporally distinct.⁸ In contrast to diabetic sclerodactyly, the firm indurated skin characteristic of diabetic scleredema (which our patient had) initially involves the shoulders and neck and may progress over the trunk, including the upper back, typically sparing the distal extremities. Of note, the dermis in scleredema is thickened with marked deposition of mucopolysaccharide.⁹

Glycemic control is paramount

Studies of patients with diabetes who have thick, waxy skin and LJM have shown that tight glycemic control may reduce skin thickness and palmar fascia fibrosis.^3,5,9 Thus, in this patient with poorly controlled T1D, diabetic sclerodactyly, early DC, and second-degree burns attributable to advanced polyneuropathy, tightened glycemic control is logical and warranted. Such control could potentially impact the trajectory and morbidity of skin and musculoskeletal manifestations in this broad-reaching disease.

The diabetic milieu necessitates clinicians’ close attention to patients’ hands.

Although there are limited treatments for mobility-related symptoms of diabetic hand syndrome, physiotherapy is recommended in more severe stages of disease to increase joint range of motion.^4,5 More severe cases of DC and trigger finger have been successfully treated with topical steroids, corticosteroid injections, and surgery.^4,5 Simply stated—and in line with compulsive foot care—the diabetic milieu necessitates clinicians’ close attention to the hands. Components of diabetic hand, LJM, DC, or trigger finger may indicate a need to screen not only for diabetes in a patient previously undiagnosed but also, importantly, for other sequelae of diabetes, including retinopathy.^4,5

Our patient was treated with a ­moderate-potency topical steroid, triamcinolone 0.1% cream, and was advised to continue optimizing glycemic control with the aid of his primary care physician. It was unclear whether the patient improved with use, as he was lost to follow-up.

A 73-year-old man with longstanding, poorly controlled type 1 diabetes (T1D) and worsening paresthesia presented to the dermatology clinic following a painless thermal burn of his fingertips from holding a hot cup of coffee. The patient’s paresthesia in a stocking-and-glove distribution was attributable to diabetes-associated polyneuropathy. Two years prior, he had been diagnosed with mildly symptomatic, diabetes-associated scleredema of his upper back and treated with topical corticosteroids.

Physical examination revealed tense bullae on the pads of all 5 digits of his right hand (FIGURE 1). Localized, waxy tightening of the skin was noted on all digits of both hands, along with mild tethering of thickened skin on the right palm.

WHAT IS YOUR DIAGNOSIS?
HOW WOULD YOU TREAT THIS PATIENT?

 

 

Diagnosis: Diabetic hand syndrome

Subtle, early signs of diabetic sclerodactyly and Dupuytren contracture (DC) were observed in the context of an existing diagnosis of T1D, leading to a diagnosis of diabetic hand syndrome.

Sclerodactyly, a thickening and tightening of the skin, is a characteristic component of limited and systemic sclerosis. Sclerodactyly is not commonly observed in association with type 1 and type 2 diabetes; however, when it does occur, it is typically found in patients who have had uncontrolled diabetes for some time.^1-3 (In the context of diabetes, this skin manifestation is known as pseudoscleroderma and scleredema diabeticorum.) In 1 study of 238 patients with T1D, the prevalence of this diabetes manifestation was 39%, with a range of 10% to 50% also reported.³

Diabetic hand syndrome is an umbrella term for the constellation of debilitating fibroproliferative sequelae of the hand rendered by diabetes.³ In addition to diabetic sclerodactyly, diabetic hand syndrome includes limited joint mobility (LJM), or diabetic cheiroarthropathy, which typically manifests with either the “prayer sign” (the inability of the palms to obtain full approximation while the wrists are maximally flexed) or the “tabletop sign” (the inability of the palm to flatten completely against the surface of a table) (FIGURE 2).^4,5 The prevalence of LJM has been reported to range from 8% to 50% of patients diagnosed with longstanding, uncontrolled diabetes.⁴

Other musculoskeletal abnormalities seen in this syndrome include: DC, often found clinically as a palpable palmar nodule that ultimately results in a flexion contracture of the affected finger; stenosing tenosynovitis, or trigger finger, in which a reproducible locking phenomenon occurs on flexion of a finger, typically in the first, third, and fourth digits; and carpal tunnel syndrome, a median nerve entrapment neuropathy that results in pain and/or paresthesia over the thumb, index, middle, and lateral half of the ring fingers.^3-5

Secondary symptoms can signal long-term degenerative disease

Stocking-and-glove distribution polyneuropathy with deterioration of tactile sensation is a common sequela of diabetes, especially as disease severity progresses.² Although the exact pathogenesis remains unclear, it has been proposed that both diabetic polyneuropathy and increased skin thickness occur secondary to long-term degenerative microvascular disease.

Continue to: Specifically, prolonged...

Specifically, prolonged hyperglycemia and secondary chronic inflammation set the stage for protein glycation, with formation of advanced glycation end products (AGEs). It is thought that these AGEs in cutaneous and connective tissues stiffen collagen, leading to scleroderma-like skin changes.²

These microvascular and fibroproliferative changes are also considered important contributors in the etiology of DC and trigger finger, ultimately leading to increased collagen deposition and fascial thickening.^4,5 In addition, increased activation of the polyol pathway may occur secondary to hyperglycemia, resulting in increased intracellular water and cellular edema.⁵

The differential is comprisedof components of systemic disease

The differential diagnosis includes tropical diabetic hand, autoimmune-related scleroderma (also called systemic sclerosis), complex regional pain syndrome, and diabetic scleredema.

Tropical diabetic hand, a potentially dangerous infection, is generally found only in tropical regions and in the setting of injury.^5,6

Autoimmune-related scleroderma may be diagnosed alongside other signs and symptoms of CREST: calcinosis, Raynaud phenomenon, esophageal dysmotility, sclerodactyly, and telangiectasia. In the absence of other signs and symptoms, and in the presence of uncontrolled diabetes, biopsy would be needed to definitively diagnose it. Clinically, diabetic hand can be distinguished with concurrent involvement of the upper back.

Continue to: Complex regional pain syndrome

Complex regional pain syndrome is characterized by chronic, disabling pain, swelling, and motor impairment that frequently affect the hand, often secondary to surgery or trauma.^5,7 This diagnosis differs from the generally painless skin hardening of diabetic hand.

The co-existence of diabetic scleredema and diabetic sclerodactyly has been previously reported, although the onset of each condition is often temporally distinct.⁸ In contrast to diabetic sclerodactyly, the firm indurated skin characteristic of diabetic scleredema (which our patient had) initially involves the shoulders and neck and may progress over the trunk, including the upper back, typically sparing the distal extremities. Of note, the dermis in scleredema is thickened with marked deposition of mucopolysaccharide.⁹

Glycemic control is paramount

Studies of patients with diabetes who have thick, waxy skin and LJM have shown that tight glycemic control may reduce skin thickness and palmar fascia fibrosis.^3,5,9 Thus, in this patient with poorly controlled T1D, diabetic sclerodactyly, early DC, and second-degree burns attributable to advanced polyneuropathy, tightened glycemic control is logical and warranted. Such control could potentially impact the trajectory and morbidity of skin and musculoskeletal manifestations in this broad-reaching disease.

The diabetic milieu necessitates clinicians’ close attention to patients’ hands.

Although there are limited treatments for mobility-related symptoms of diabetic hand syndrome, physiotherapy is recommended in more severe stages of disease to increase joint range of motion.^4,5 More severe cases of DC and trigger finger have been successfully treated with topical steroids, corticosteroid injections, and surgery.^4,5 Simply stated—and in line with compulsive foot care—the diabetic milieu necessitates clinicians’ close attention to the hands. Components of diabetic hand, LJM, DC, or trigger finger may indicate a need to screen not only for diabetes in a patient previously undiagnosed but also, importantly, for other sequelae of diabetes, including retinopathy.^4,5

Our patient was treated with a ­moderate-potency topical steroid, triamcinolone 0.1% cream, and was advised to continue optimizing glycemic control with the aid of his primary care physician. It was unclear whether the patient improved with use, as he was lost to follow-up.

People with thyroid cancer treated with thyroidectomy have as much as a 40% increased risk of developing type 2 diabetes, regardless of their age, with the elevated risk observed with low as well as high doses of postoperative levothyroxine, new research shows.

“This is the first population-based study to demonstrate an elevated risk of type 2 diabetes in postthyroidectomy patients with thyroid cancer, compared with that in matched controls,” wrote the authors of the research, published recently in the Journal of Clinical Endocrinology & Metabolism.

“Notably, there was a U-shaped relationship between postoperative levothyroxine dosage, a surrogate marker of TSH suppression, and the risk of type 2 diabetes,” said Hye Jin Yoo, MD, of the division of endocrinology and metabolism, Korea University College of Medicine, Seoul, and colleagues.

While other studies have linked thyroidectomy for thyroid cancer with an elevated risk for other metabolic conditions, including coronary heart disease and ischemic stroke, the relatively high diabetes risk is unexpected, said Tyler Drake, MD, an endocrinologist with the Minneapolis VA Health Care System.

“A 40% increased risk of diabetes is a big surprise,” he said in an interview.

“Diabetes is very common, with about one in 10 U.S. adults having type 2 diabetes, but a 40% increased risk in thyroid cancer patients is higher than I see in my clinical practice. [However], it is important to note that the [highest] risk was predominantly among the groups on the lowest and highest doses of levothyroxine,” said Dr. Drake, assistant professor of medicine at the University of Minnesota, Minneapolis.
 

U-shaped relationship between levothyroxine dose and diabetes risk

The findings are from a study of 36,377 patients with thyroid cancer in the National Health Insurance Service (NHIS) database in Korea who had undergone a thyroidectomy between 2004 and 2013.

The patients were matched 1:1 with controls who had nonthyroid cancers. Their mean age was 46.6 years, about 30% were male, and their mean body mass index was 23.8 kg/m².

Over a mean follow-up of 6.6 years, the patients with thyroid cancer had a significantly higher risk of developing type 2 diabetes, at a rate of 47.5% (10,812) compared with 36.9% (9414; HR, 1.43; P < .001) in the control group, after adjustment for factors such as age, sex, BMI, smoking, drinking, systolic blood pressure, and fasting glucose.

The risk of type 2 diabetes among those with thyroid cancer was higher among the 83.2% of patients who underwent a total thyroidectomy compared with the 16.8% who had a unilateral lobectomy (HR, 1.06; P < .001).

In addition, those with thyroid cancer who received the lowest as well as highest dosages of levothyroxine had significantly higher risks of type 2 diabetes compared with controls (HR, 1.50 and 1.39, respectively; both P < .001).

A closer look at quartiles of levothyroxine dosing showed the first (lowest) quartile (defined as a mean levothyroxine dosage of < 101 mcg/day) was associated with an increased risk of type 2 diabetes compared with the second quartile group (101-127 mcg/day; HR, 1.45), as was the fourth quartile (≥ 150 mcg/day; HR, 1.37), while a decreased risk of type 2 diabetes was observed in the third quartile group (128-149 mcg/day versus the second quartile group; HR, 0.91).

“This result suggests a U-shaped relationship between the mean levothyroxine dosage and risk of type 2 diabetes in postthyroidectomy patients with thyroid cancer,” the authors said.

However, “consistent with previous studies, the present study showed that the highest risk of type 2 diabetes was observed in patients with thyroid cancer who were treated with the lowest mean dosage of levothyroxine,” they noted.

“This result suggests that inadequate supplementation of thyroid hormones may worsen glucose metabolism and should therefore be avoided.”
 

Potential mechanisms

Abnormal thyroid function, including hypo- and hyperthyroidism, following thyroidectomy and subsequent treatment with levothyroxine, is known to have potentially detrimental effects on glucose regulation among patients with thyroid cancer.

The potential mechanisms linking hypothyroidism with diabetes specifically include the possibility that insulin becomes unable to promote the utilization of glucose by muscles and adipose tissue. However, thyroid hormone replacement has been associated with a normalization of insulin sensitivity, the authors noted.

Meanwhile, glucose intolerance is common among patients with hyperthyroidism, largely due to an increase in hepatic glucose production, and likewise, the normalization of thyroid levels among those treated with methimazole has been linked to normalization of glucose and lipid metabolism alterations.

Dr. Drake noted that an important study limitation is that patients were analyzed based on their levothyroxine dose and not their TSH values, which the authors explain was due to the unavailability of the TSH values. 

“By looking at levothyroxine doses, and not TSH values, it is possible some patients were being improperly treated with either too much or too little levothyroxine,” Dr. Drake noted.
 

Control group should have had hypothyroidism

The findings nevertheless shed light on the risk of diabetes following thyroidectomy for thyroid cancer, Anupam Kotwal, MD, commented on the study.

“This study is significant because it addresses an important topic exploring the link between thyroid dysfunction and metabolic disease, in this case ... hypothyroidism, due to surgery for thyroid cancer and type 2 diabetes,” Dr. Kotwal, assistant professor of medicine in the division of diabetes, endocrinology & metabolism at the University of Nebraska Medical Center, Omaha, said in an interview.

In terms of other limitations, Dr. Kotwal noted that the controls did not have hypothyroidism; therefore, “from this study, it is impossible to confirm whether hypothyroidism from any cause would be associated with higher incidence of diabetes or if it is specific to thyroid surgery for thyroid cancer.

“It would have been useful to have a control group of autoimmune primary hypothyroidism to evaluate the rate of diabetes during a similar follow-up duration,” Dr. Kotwal said.

“Hence, cohort studies with more granular data such as degree of TSH suppression and having a control group of hypothyroid patients due to autoimmune thyroid disease are needed to better understand this risk.”

Dr. Kotwal and Dr. Drake have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

People with thyroid cancer treated with thyroidectomy have as much as a 40% increased risk of developing type 2 diabetes, regardless of their age, with the elevated risk observed with low as well as high doses of postoperative levothyroxine, new research shows.

“This is the first population-based study to demonstrate an elevated risk of type 2 diabetes in postthyroidectomy patients with thyroid cancer, compared with that in matched controls,” wrote the authors of the research, published recently in the Journal of Clinical Endocrinology & Metabolism.

“Notably, there was a U-shaped relationship between postoperative levothyroxine dosage, a surrogate marker of TSH suppression, and the risk of type 2 diabetes,” said Hye Jin Yoo, MD, of the division of endocrinology and metabolism, Korea University College of Medicine, Seoul, and colleagues.

While other studies have linked thyroidectomy for thyroid cancer with an elevated risk for other metabolic conditions, including coronary heart disease and ischemic stroke, the relatively high diabetes risk is unexpected, said Tyler Drake, MD, an endocrinologist with the Minneapolis VA Health Care System.

“A 40% increased risk of diabetes is a big surprise,” he said in an interview.

“Diabetes is very common, with about one in 10 U.S. adults having type 2 diabetes, but a 40% increased risk in thyroid cancer patients is higher than I see in my clinical practice. [However], it is important to note that the [highest] risk was predominantly among the groups on the lowest and highest doses of levothyroxine,” said Dr. Drake, assistant professor of medicine at the University of Minnesota, Minneapolis.
 

U-shaped relationship between levothyroxine dose and diabetes risk

The findings are from a study of 36,377 patients with thyroid cancer in the National Health Insurance Service (NHIS) database in Korea who had undergone a thyroidectomy between 2004 and 2013.

The patients were matched 1:1 with controls who had nonthyroid cancers. Their mean age was 46.6 years, about 30% were male, and their mean body mass index was 23.8 kg/m².

Over a mean follow-up of 6.6 years, the patients with thyroid cancer had a significantly higher risk of developing type 2 diabetes, at a rate of 47.5% (10,812) compared with 36.9% (9414; HR, 1.43; P < .001) in the control group, after adjustment for factors such as age, sex, BMI, smoking, drinking, systolic blood pressure, and fasting glucose.

The risk of type 2 diabetes among those with thyroid cancer was higher among the 83.2% of patients who underwent a total thyroidectomy compared with the 16.8% who had a unilateral lobectomy (HR, 1.06; P < .001).

In addition, those with thyroid cancer who received the lowest as well as highest dosages of levothyroxine had significantly higher risks of type 2 diabetes compared with controls (HR, 1.50 and 1.39, respectively; both P < .001).

A closer look at quartiles of levothyroxine dosing showed the first (lowest) quartile (defined as a mean levothyroxine dosage of < 101 mcg/day) was associated with an increased risk of type 2 diabetes compared with the second quartile group (101-127 mcg/day; HR, 1.45), as was the fourth quartile (≥ 150 mcg/day; HR, 1.37), while a decreased risk of type 2 diabetes was observed in the third quartile group (128-149 mcg/day versus the second quartile group; HR, 0.91).

“This result suggests a U-shaped relationship between the mean levothyroxine dosage and risk of type 2 diabetes in postthyroidectomy patients with thyroid cancer,” the authors said.

However, “consistent with previous studies, the present study showed that the highest risk of type 2 diabetes was observed in patients with thyroid cancer who were treated with the lowest mean dosage of levothyroxine,” they noted.

“This result suggests that inadequate supplementation of thyroid hormones may worsen glucose metabolism and should therefore be avoided.”
 

Potential mechanisms

Abnormal thyroid function, including hypo- and hyperthyroidism, following thyroidectomy and subsequent treatment with levothyroxine, is known to have potentially detrimental effects on glucose regulation among patients with thyroid cancer.

The potential mechanisms linking hypothyroidism with diabetes specifically include the possibility that insulin becomes unable to promote the utilization of glucose by muscles and adipose tissue. However, thyroid hormone replacement has been associated with a normalization of insulin sensitivity, the authors noted.

Meanwhile, glucose intolerance is common among patients with hyperthyroidism, largely due to an increase in hepatic glucose production, and likewise, the normalization of thyroid levels among those treated with methimazole has been linked to normalization of glucose and lipid metabolism alterations.

Dr. Drake noted that an important study limitation is that patients were analyzed based on their levothyroxine dose and not their TSH values, which the authors explain was due to the unavailability of the TSH values. 

“By looking at levothyroxine doses, and not TSH values, it is possible some patients were being improperly treated with either too much or too little levothyroxine,” Dr. Drake noted.
 

Control group should have had hypothyroidism

The findings nevertheless shed light on the risk of diabetes following thyroidectomy for thyroid cancer, Anupam Kotwal, MD, commented on the study.

“This study is significant because it addresses an important topic exploring the link between thyroid dysfunction and metabolic disease, in this case ... hypothyroidism, due to surgery for thyroid cancer and type 2 diabetes,” Dr. Kotwal, assistant professor of medicine in the division of diabetes, endocrinology & metabolism at the University of Nebraska Medical Center, Omaha, said in an interview.

In terms of other limitations, Dr. Kotwal noted that the controls did not have hypothyroidism; therefore, “from this study, it is impossible to confirm whether hypothyroidism from any cause would be associated with higher incidence of diabetes or if it is specific to thyroid surgery for thyroid cancer.

“It would have been useful to have a control group of autoimmune primary hypothyroidism to evaluate the rate of diabetes during a similar follow-up duration,” Dr. Kotwal said.

“Hence, cohort studies with more granular data such as degree of TSH suppression and having a control group of hypothyroid patients due to autoimmune thyroid disease are needed to better understand this risk.”

Dr. Kotwal and Dr. Drake have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

People with thyroid cancer treated with thyroidectomy have as much as a 40% increased risk of developing type 2 diabetes, regardless of their age, with the elevated risk observed with low as well as high doses of postoperative levothyroxine, new research shows.

“This is the first population-based study to demonstrate an elevated risk of type 2 diabetes in postthyroidectomy patients with thyroid cancer, compared with that in matched controls,” wrote the authors of the research, published recently in the Journal of Clinical Endocrinology & Metabolism.

“Notably, there was a U-shaped relationship between postoperative levothyroxine dosage, a surrogate marker of TSH suppression, and the risk of type 2 diabetes,” said Hye Jin Yoo, MD, of the division of endocrinology and metabolism, Korea University College of Medicine, Seoul, and colleagues.

While other studies have linked thyroidectomy for thyroid cancer with an elevated risk for other metabolic conditions, including coronary heart disease and ischemic stroke, the relatively high diabetes risk is unexpected, said Tyler Drake, MD, an endocrinologist with the Minneapolis VA Health Care System.

“A 40% increased risk of diabetes is a big surprise,” he said in an interview.

“Diabetes is very common, with about one in 10 U.S. adults having type 2 diabetes, but a 40% increased risk in thyroid cancer patients is higher than I see in my clinical practice. [However], it is important to note that the [highest] risk was predominantly among the groups on the lowest and highest doses of levothyroxine,” said Dr. Drake, assistant professor of medicine at the University of Minnesota, Minneapolis.
 

U-shaped relationship between levothyroxine dose and diabetes risk

The findings are from a study of 36,377 patients with thyroid cancer in the National Health Insurance Service (NHIS) database in Korea who had undergone a thyroidectomy between 2004 and 2013.

The patients were matched 1:1 with controls who had nonthyroid cancers. Their mean age was 46.6 years, about 30% were male, and their mean body mass index was 23.8 kg/m².

Over a mean follow-up of 6.6 years, the patients with thyroid cancer had a significantly higher risk of developing type 2 diabetes, at a rate of 47.5% (10,812) compared with 36.9% (9414; HR, 1.43; P < .001) in the control group, after adjustment for factors such as age, sex, BMI, smoking, drinking, systolic blood pressure, and fasting glucose.

The risk of type 2 diabetes among those with thyroid cancer was higher among the 83.2% of patients who underwent a total thyroidectomy compared with the 16.8% who had a unilateral lobectomy (HR, 1.06; P < .001).

In addition, those with thyroid cancer who received the lowest as well as highest dosages of levothyroxine had significantly higher risks of type 2 diabetes compared with controls (HR, 1.50 and 1.39, respectively; both P < .001).

A closer look at quartiles of levothyroxine dosing showed the first (lowest) quartile (defined as a mean levothyroxine dosage of < 101 mcg/day) was associated with an increased risk of type 2 diabetes compared with the second quartile group (101-127 mcg/day; HR, 1.45), as was the fourth quartile (≥ 150 mcg/day; HR, 1.37), while a decreased risk of type 2 diabetes was observed in the third quartile group (128-149 mcg/day versus the second quartile group; HR, 0.91).

“This result suggests a U-shaped relationship between the mean levothyroxine dosage and risk of type 2 diabetes in postthyroidectomy patients with thyroid cancer,” the authors said.

However, “consistent with previous studies, the present study showed that the highest risk of type 2 diabetes was observed in patients with thyroid cancer who were treated with the lowest mean dosage of levothyroxine,” they noted.

“This result suggests that inadequate supplementation of thyroid hormones may worsen glucose metabolism and should therefore be avoided.”
 

Potential mechanisms

Abnormal thyroid function, including hypo- and hyperthyroidism, following thyroidectomy and subsequent treatment with levothyroxine, is known to have potentially detrimental effects on glucose regulation among patients with thyroid cancer.

The potential mechanisms linking hypothyroidism with diabetes specifically include the possibility that insulin becomes unable to promote the utilization of glucose by muscles and adipose tissue. However, thyroid hormone replacement has been associated with a normalization of insulin sensitivity, the authors noted.

Meanwhile, glucose intolerance is common among patients with hyperthyroidism, largely due to an increase in hepatic glucose production, and likewise, the normalization of thyroid levels among those treated with methimazole has been linked to normalization of glucose and lipid metabolism alterations.

Dr. Drake noted that an important study limitation is that patients were analyzed based on their levothyroxine dose and not their TSH values, which the authors explain was due to the unavailability of the TSH values. 

“By looking at levothyroxine doses, and not TSH values, it is possible some patients were being improperly treated with either too much or too little levothyroxine,” Dr. Drake noted.
 

Control group should have had hypothyroidism

The findings nevertheless shed light on the risk of diabetes following thyroidectomy for thyroid cancer, Anupam Kotwal, MD, commented on the study.

“This study is significant because it addresses an important topic exploring the link between thyroid dysfunction and metabolic disease, in this case ... hypothyroidism, due to surgery for thyroid cancer and type 2 diabetes,” Dr. Kotwal, assistant professor of medicine in the division of diabetes, endocrinology & metabolism at the University of Nebraska Medical Center, Omaha, said in an interview.

In terms of other limitations, Dr. Kotwal noted that the controls did not have hypothyroidism; therefore, “from this study, it is impossible to confirm whether hypothyroidism from any cause would be associated with higher incidence of diabetes or if it is specific to thyroid surgery for thyroid cancer.

“It would have been useful to have a control group of autoimmune primary hypothyroidism to evaluate the rate of diabetes during a similar follow-up duration,” Dr. Kotwal said.

“Hence, cohort studies with more granular data such as degree of TSH suppression and having a control group of hypothyroid patients due to autoimmune thyroid disease are needed to better understand this risk.”

Dr. Kotwal and Dr. Drake have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

As the pandemic shows no signs of ending, primary care doctors may be reassured that delivering care via video teleconferencing can be as effective as usual in-person consultation for several common health conditions.

This was a finding of a new study published in Annals of Internal Medicine involving a review of literature on video teleconferencing (VTC) visits, which was authored by Jordan Albritton, PhD, MPH and his colleagues.

The authors found generally comparable patient outcomes as well as no differences in health care use, patient satisfaction, and quality of life when visits conducted using VTC were compared with usual care.

While VTC may work best for monitoring patients with chronic conditions, it can also be effective for acute care, said Dr. Albritton, who is a research public health analyst at RTI International in Research Triangle Park, N.C., in an interview.

The investigators analyzed 20 randomized controlled trials of at least 50 patients and acceptable risk of bias in which VTC was used either for main or adjunct care delivery. Published from 2013 to 2019, these studies looked at care for diabetes and pain management, as well as some respiratory, neurologic, and cardiovascular conditions. Studies comparing VTC with usual care that did not involve any added in-person care were more likely to favor the VTC group, the investigators found.

“We excluded conditions such as substance use disorders, maternal care, and weight management for which there was sufficient prior evidence of the benefit of VTC,” Dr. Albritton said in an interview. “But I don’t think our results would have been substantially different if we had included these other diseases. We found general evidence in the literature that VTC is effective for a broader range of conditions.”

In some cases, such as if changes in a patient’s condition triggered an automatic virtual visit, the author said he thinks VTC may lead to even greater effectiveness.

“The doctor and patient could figure out on the spot what’s going on and perhaps change the medication,” Dr. Albritton explained.

In general agreement is Julia L. Frydman, MD, assistant professor in the Brookdale Department of Geriatric and Palliative Medicine at Icahn School of Medicine at Mount Sinai in New York, who was not involved in the RTI research.

“Telemedicine has promise across many medical subspecialties, and what we need now are more studies to understand the perspectives of patients, caregivers, and clinicians as well as the impact of telemedicine on health outcomes and healthcare utilization.”

In acknowledgment of their utility, video visits are on the rise in the United States. A 2020 survey found that 22% of patients and 80% of physicians reported having participated in a video visit, three times the rate of the previous year. The authors noted that policy changes enacted to support telehealth strategies during the pandemic are expected to remain in place, and although patients are returning to in-person care, the virtual visit market will likely continue growing.
 

Increased telemedicine use by older adults

“We’ve seen an exciting expansion of telemedicine use among older adults, and we need to focus on continuing to meet their needs,” Dr. Frydman said.

In a recent study of televisits during the pandemic, Dr. Frydman’s group found a fivefold greater uptake of remote consultations by seniors – from 5% to 25%. Although in-person visits were far more common among older adults.

A specific advantage of video-based over audio-only telehealth, noted Dr. Albritton, is that physicians can directly observe patients in their home environment. Sharing that view is Deepa Iyengar, MBBS/MD,MPH, professor of family medicine at McGovern Medical School at The University of Texas Health Science Center at Houston, where, she said, “the pandemic has put VTC use into overdrive.”

According to Dr. Iyengar, who was not involved in the RTI research, the video component definitely represents value-added over phone calls. “You can pick up visual cues on video that you might not see if the patient came in and you can see what the home environment is like – whether there are a lot of loose rugs on the floor or broken or missing light bulbs,” she said in an interview.
 

‘VTC is here to stay’

In other parts of the country, doctors are finding virtual care useful – and more common. “VTC is here to stay, for sure – the horse is out of the barn,” said Cheryl L. Wilkes, MD, an internist at Northwestern Medicine and assistant professor of medicine at Northwestern University in Chicago. “The RTI study shows no harm from VTC and also shows it may even improve clinical outcomes.”

Video visits can also save patients high parking fees at clinics and spare the sick or elderly from having to hire caregivers to bring them into the office or from having to walk blocks in dangerous weather conditions, she added. “And I can do a virtual visit on the fly or at night when a relative or caregiver is home from work to be there with the patient.”

In addition to being beneficial for following up with patients with chronic diseases such as hypertension or diabetes, VTC may be able to replace some visits that have traditionally required hands-on care, said Dr. Wilkes.

She said she knows a cardiologist who has refined a process whereby a patient – say, one who may have edema – is asked to perform a maneuver via VTC and then display the result to the doctor: The doctor says, “put your leg up and press on it hard for 10 seconds and then show me what it looks like,” according to Dr. Wilkes.

The key now is to identify the best persons across specialties from neurology to rheumatology to videotape ways they’ve created to help their patients participate virtually in consults traditionally done at the office, Dr. Wilkes noted.

But some conditions will always require palpation and the use of a stethoscope, according Dr. Iyengar.

“If someone has an ulcer, I have to be able to feel it,” she said.

And while some maternity care can be given virtually – for instance, if a mother-to be develops a bad cold – hands-on obstetrical care to check the position and health of the baby obviously has to be done in person. “So VTC is definitely going to be a welcome addition but not a replacement,” Dr. Iyengar said.

Gaps in research on VTC visits

Many questions remain regarding the overall usefulness of VTC visits for certain patient groups, according to the authors.

They highlighted, for example, the dearth of data on subgroups or on underserved and vulnerable populations, with no head-to-head studies identified in their review. In addition, they found no studies examining VTC versus usual care for patients with concurrent conditions or on its effect on health equity and disparities.

“It’s now our job to understand the ongoing barriers to telemedicine access, including the digital divide and the usability of telemedicine platforms, and design interventions that overcome them,” Dr. Frydman said. “At the same time, we need to make sure we’re understanding and respecting the preferences of older adults in terms of how they access health care.”

This study was supported by the Patient-Centered Outcomes Research Institute (PCORI). Dr. Albritton is employed by RTI International, the contractor responsible for conducting the research and developing the manuscript. Several coauthors disclosed support from or contracts with PCORI. One coauthor’s spouse holds stock in private health companies. Dr. Frydman, Dr. Iyengar, and Dr. Wilkes disclosed no competing interests relevant to their comments.

As the pandemic shows no signs of ending, primary care doctors may be reassured that delivering care via video teleconferencing can be as effective as usual in-person consultation for several common health conditions.

This was a finding of a new study published in Annals of Internal Medicine involving a review of literature on video teleconferencing (VTC) visits, which was authored by Jordan Albritton, PhD, MPH and his colleagues.

The authors found generally comparable patient outcomes as well as no differences in health care use, patient satisfaction, and quality of life when visits conducted using VTC were compared with usual care.

While VTC may work best for monitoring patients with chronic conditions, it can also be effective for acute care, said Dr. Albritton, who is a research public health analyst at RTI International in Research Triangle Park, N.C., in an interview.

The investigators analyzed 20 randomized controlled trials of at least 50 patients and acceptable risk of bias in which VTC was used either for main or adjunct care delivery. Published from 2013 to 2019, these studies looked at care for diabetes and pain management, as well as some respiratory, neurologic, and cardiovascular conditions. Studies comparing VTC with usual care that did not involve any added in-person care were more likely to favor the VTC group, the investigators found.

“We excluded conditions such as substance use disorders, maternal care, and weight management for which there was sufficient prior evidence of the benefit of VTC,” Dr. Albritton said in an interview. “But I don’t think our results would have been substantially different if we had included these other diseases. We found general evidence in the literature that VTC is effective for a broader range of conditions.”

In some cases, such as if changes in a patient’s condition triggered an automatic virtual visit, the author said he thinks VTC may lead to even greater effectiveness.

“The doctor and patient could figure out on the spot what’s going on and perhaps change the medication,” Dr. Albritton explained.

In general agreement is Julia L. Frydman, MD, assistant professor in the Brookdale Department of Geriatric and Palliative Medicine at Icahn School of Medicine at Mount Sinai in New York, who was not involved in the RTI research.

“Telemedicine has promise across many medical subspecialties, and what we need now are more studies to understand the perspectives of patients, caregivers, and clinicians as well as the impact of telemedicine on health outcomes and healthcare utilization.”

In acknowledgment of their utility, video visits are on the rise in the United States. A 2020 survey found that 22% of patients and 80% of physicians reported having participated in a video visit, three times the rate of the previous year. The authors noted that policy changes enacted to support telehealth strategies during the pandemic are expected to remain in place, and although patients are returning to in-person care, the virtual visit market will likely continue growing.
 

Increased telemedicine use by older adults

“We’ve seen an exciting expansion of telemedicine use among older adults, and we need to focus on continuing to meet their needs,” Dr. Frydman said.

In a recent study of televisits during the pandemic, Dr. Frydman’s group found a fivefold greater uptake of remote consultations by seniors – from 5% to 25%. Although in-person visits were far more common among older adults.

A specific advantage of video-based over audio-only telehealth, noted Dr. Albritton, is that physicians can directly observe patients in their home environment. Sharing that view is Deepa Iyengar, MBBS/MD,MPH, professor of family medicine at McGovern Medical School at The University of Texas Health Science Center at Houston, where, she said, “the pandemic has put VTC use into overdrive.”

According to Dr. Iyengar, who was not involved in the RTI research, the video component definitely represents value-added over phone calls. “You can pick up visual cues on video that you might not see if the patient came in and you can see what the home environment is like – whether there are a lot of loose rugs on the floor or broken or missing light bulbs,” she said in an interview.
 

‘VTC is here to stay’

In other parts of the country, doctors are finding virtual care useful – and more common. “VTC is here to stay, for sure – the horse is out of the barn,” said Cheryl L. Wilkes, MD, an internist at Northwestern Medicine and assistant professor of medicine at Northwestern University in Chicago. “The RTI study shows no harm from VTC and also shows it may even improve clinical outcomes.”

Video visits can also save patients high parking fees at clinics and spare the sick or elderly from having to hire caregivers to bring them into the office or from having to walk blocks in dangerous weather conditions, she added. “And I can do a virtual visit on the fly or at night when a relative or caregiver is home from work to be there with the patient.”

In addition to being beneficial for following up with patients with chronic diseases such as hypertension or diabetes, VTC may be able to replace some visits that have traditionally required hands-on care, said Dr. Wilkes.

She said she knows a cardiologist who has refined a process whereby a patient – say, one who may have edema – is asked to perform a maneuver via VTC and then display the result to the doctor: The doctor says, “put your leg up and press on it hard for 10 seconds and then show me what it looks like,” according to Dr. Wilkes.

The key now is to identify the best persons across specialties from neurology to rheumatology to videotape ways they’ve created to help their patients participate virtually in consults traditionally done at the office, Dr. Wilkes noted.

But some conditions will always require palpation and the use of a stethoscope, according Dr. Iyengar.

“If someone has an ulcer, I have to be able to feel it,” she said.

And while some maternity care can be given virtually – for instance, if a mother-to be develops a bad cold – hands-on obstetrical care to check the position and health of the baby obviously has to be done in person. “So VTC is definitely going to be a welcome addition but not a replacement,” Dr. Iyengar said.

Gaps in research on VTC visits

Many questions remain regarding the overall usefulness of VTC visits for certain patient groups, according to the authors.

They highlighted, for example, the dearth of data on subgroups or on underserved and vulnerable populations, with no head-to-head studies identified in their review. In addition, they found no studies examining VTC versus usual care for patients with concurrent conditions or on its effect on health equity and disparities.

“It’s now our job to understand the ongoing barriers to telemedicine access, including the digital divide and the usability of telemedicine platforms, and design interventions that overcome them,” Dr. Frydman said. “At the same time, we need to make sure we’re understanding and respecting the preferences of older adults in terms of how they access health care.”

This study was supported by the Patient-Centered Outcomes Research Institute (PCORI). Dr. Albritton is employed by RTI International, the contractor responsible for conducting the research and developing the manuscript. Several coauthors disclosed support from or contracts with PCORI. One coauthor’s spouse holds stock in private health companies. Dr. Frydman, Dr. Iyengar, and Dr. Wilkes disclosed no competing interests relevant to their comments.

As the pandemic shows no signs of ending, primary care doctors may be reassured that delivering care via video teleconferencing can be as effective as usual in-person consultation for several common health conditions.

This was a finding of a new study published in Annals of Internal Medicine involving a review of literature on video teleconferencing (VTC) visits, which was authored by Jordan Albritton, PhD, MPH and his colleagues.

The authors found generally comparable patient outcomes as well as no differences in health care use, patient satisfaction, and quality of life when visits conducted using VTC were compared with usual care.

While VTC may work best for monitoring patients with chronic conditions, it can also be effective for acute care, said Dr. Albritton, who is a research public health analyst at RTI International in Research Triangle Park, N.C., in an interview.

The investigators analyzed 20 randomized controlled trials of at least 50 patients and acceptable risk of bias in which VTC was used either for main or adjunct care delivery. Published from 2013 to 2019, these studies looked at care for diabetes and pain management, as well as some respiratory, neurologic, and cardiovascular conditions. Studies comparing VTC with usual care that did not involve any added in-person care were more likely to favor the VTC group, the investigators found.

“We excluded conditions such as substance use disorders, maternal care, and weight management for which there was sufficient prior evidence of the benefit of VTC,” Dr. Albritton said in an interview. “But I don’t think our results would have been substantially different if we had included these other diseases. We found general evidence in the literature that VTC is effective for a broader range of conditions.”

In some cases, such as if changes in a patient’s condition triggered an automatic virtual visit, the author said he thinks VTC may lead to even greater effectiveness.

“The doctor and patient could figure out on the spot what’s going on and perhaps change the medication,” Dr. Albritton explained.

In general agreement is Julia L. Frydman, MD, assistant professor in the Brookdale Department of Geriatric and Palliative Medicine at Icahn School of Medicine at Mount Sinai in New York, who was not involved in the RTI research.

“Telemedicine has promise across many medical subspecialties, and what we need now are more studies to understand the perspectives of patients, caregivers, and clinicians as well as the impact of telemedicine on health outcomes and healthcare utilization.”

In acknowledgment of their utility, video visits are on the rise in the United States. A 2020 survey found that 22% of patients and 80% of physicians reported having participated in a video visit, three times the rate of the previous year. The authors noted that policy changes enacted to support telehealth strategies during the pandemic are expected to remain in place, and although patients are returning to in-person care, the virtual visit market will likely continue growing.
 

Increased telemedicine use by older adults

“We’ve seen an exciting expansion of telemedicine use among older adults, and we need to focus on continuing to meet their needs,” Dr. Frydman said.

In a recent study of televisits during the pandemic, Dr. Frydman’s group found a fivefold greater uptake of remote consultations by seniors – from 5% to 25%. Although in-person visits were far more common among older adults.

A specific advantage of video-based over audio-only telehealth, noted Dr. Albritton, is that physicians can directly observe patients in their home environment. Sharing that view is Deepa Iyengar, MBBS/MD,MPH, professor of family medicine at McGovern Medical School at The University of Texas Health Science Center at Houston, where, she said, “the pandemic has put VTC use into overdrive.”

According to Dr. Iyengar, who was not involved in the RTI research, the video component definitely represents value-added over phone calls. “You can pick up visual cues on video that you might not see if the patient came in and you can see what the home environment is like – whether there are a lot of loose rugs on the floor or broken or missing light bulbs,” she said in an interview.
 

‘VTC is here to stay’

In other parts of the country, doctors are finding virtual care useful – and more common. “VTC is here to stay, for sure – the horse is out of the barn,” said Cheryl L. Wilkes, MD, an internist at Northwestern Medicine and assistant professor of medicine at Northwestern University in Chicago. “The RTI study shows no harm from VTC and also shows it may even improve clinical outcomes.”

Video visits can also save patients high parking fees at clinics and spare the sick or elderly from having to hire caregivers to bring them into the office or from having to walk blocks in dangerous weather conditions, she added. “And I can do a virtual visit on the fly or at night when a relative or caregiver is home from work to be there with the patient.”

In addition to being beneficial for following up with patients with chronic diseases such as hypertension or diabetes, VTC may be able to replace some visits that have traditionally required hands-on care, said Dr. Wilkes.

She said she knows a cardiologist who has refined a process whereby a patient – say, one who may have edema – is asked to perform a maneuver via VTC and then display the result to the doctor: The doctor says, “put your leg up and press on it hard for 10 seconds and then show me what it looks like,” according to Dr. Wilkes.

The key now is to identify the best persons across specialties from neurology to rheumatology to videotape ways they’ve created to help their patients participate virtually in consults traditionally done at the office, Dr. Wilkes noted.

But some conditions will always require palpation and the use of a stethoscope, according Dr. Iyengar.

“If someone has an ulcer, I have to be able to feel it,” she said.

And while some maternity care can be given virtually – for instance, if a mother-to be develops a bad cold – hands-on obstetrical care to check the position and health of the baby obviously has to be done in person. “So VTC is definitely going to be a welcome addition but not a replacement,” Dr. Iyengar said.

Gaps in research on VTC visits

Many questions remain regarding the overall usefulness of VTC visits for certain patient groups, according to the authors.

They highlighted, for example, the dearth of data on subgroups or on underserved and vulnerable populations, with no head-to-head studies identified in their review. In addition, they found no studies examining VTC versus usual care for patients with concurrent conditions or on its effect on health equity and disparities.

“It’s now our job to understand the ongoing barriers to telemedicine access, including the digital divide and the usability of telemedicine platforms, and design interventions that overcome them,” Dr. Frydman said. “At the same time, we need to make sure we’re understanding and respecting the preferences of older adults in terms of how they access health care.”

This study was supported by the Patient-Centered Outcomes Research Institute (PCORI). Dr. Albritton is employed by RTI International, the contractor responsible for conducting the research and developing the manuscript. Several coauthors disclosed support from or contracts with PCORI. One coauthor’s spouse holds stock in private health companies. Dr. Frydman, Dr. Iyengar, and Dr. Wilkes disclosed no competing interests relevant to their comments.

Going to bed later than usual and/or getting a poor night’s sleep are both associated with impaired glycemic response to breakfast the following morning in healthy adults, according to a multiple test-meal challenge study conducted over 14 days.

“Our data suggest that sleep duration, efficiency, and midpoint are important determinants of postprandial glycemic control at a population level,” Neil Tsereteli, MD, Lund University Diabetes Centre, Malmo, Sweden, and colleagues wrote in their article, published online Nov. 30, 2021, in Diabetologia.

“And [the results] suggest that one-size-fits-all sleep recommendations are suboptimal, particularly in the context of postprandial glycemic control, a key component of diabetes prevention,” they added.
 

Prior research on sleep quality and control of glucose lacking

Diet, exercise, and sleep are fundamental components of a healthy lifestyle; however, the role that sleep plays in affecting blood glucose control in generally healthy people has been studied little so far, the researchers wrote.

Sleep disorders can act as a measure of general health as they often occur alongside other health problems. Sleep quality also has a direct causal effect on many conditions such as cardiovascular disease, obesity, and type 2 diabetes. And disturbed sleep caused by conditions such as obstructive sleep apnea is associated with the prevalence of type 2 diabetes and risk of associated complications.

This and other evidence suggest a strong link between glucose regulation and the quality and duration of sleep.

Dr. Tsereteli and colleagues set out to examine this further in the Personalized Responses to Dietary Composition Trial 1, which involved 953 healthy adults who consumed standardized meals over 2 weeks in a clinic setting and at home.

“The meals were consumed either for breakfast or lunch in a randomized meal order and consisted of eight different standardized meals,”  the researchers wrote.

Activity and sleep were monitored using a wearable device with an accelerometer. Postprandial blood glucose levels were measured using a continuous glucose monitor.

Sleep variables including quality, duration, and timing and their impact on glycemic response to breakfast the following morning, and were compared between participants and within each individual.
 

Better sleep efficiency, better glucose control

The study found that, although there was no significant association between length of sleep period and postmeal glycemic response, there was a significant interaction when the nutritional content of the breakfast meal was also considered.

Longer sleep periods were associated with lower blood glucose following high-carbohydrate and high-fat breakfasts, indicating better blood glucose control.

Additionally, the researchers observed a within-person effect in which a study participant who slept for longer than they typically would was likely to have reduced postprandial blood glucose following a high-carbohydrate or high-fat breakfast the next day.

The authors also found a significant link between sleep efficiency (ratio of time asleep to total length of sleep period) and glycemic control. When a participant slept more efficiently than usual, their postprandial blood glucose also tended to be lower than usual.

“This effect was largely driven by sleep onset (going to bed later) rather than sleep offset (waking up later),” Dr. Tsereteli and colleagues noted.
 

Sleep a key pillar of health

Asked whether these particular sleep effects might be exacerbated in patients with diabetes, senior author Paul Franks, MD, also from the Lund University Diabetes Centre, felt they could not meaningfully extrapolate results to people with diabetes, given that many take glucose-lowering medications.

“However, it is likely that these results would be similar or exacerbated in people with prediabetes, as glucose fluctuations in this subgroup of patients are generally greater than in people with normoglycemia,” he noted in an interview.

“Sleep is a key pillar of health, and focusing on both sleep and diet is key for healthy blood glucose control,” he added.

“Compensating for a bad night’s sleep by consuming a very sugary breakfast or energy drinks is likely to be especially detrimental for blood glucose control,” Dr. Franks said.

The study was funded by Lund University. Dr. Tsereteli and Dr. Franks reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Going to bed later than usual and/or getting a poor night’s sleep are both associated with impaired glycemic response to breakfast the following morning in healthy adults, according to a multiple test-meal challenge study conducted over 14 days.

“Our data suggest that sleep duration, efficiency, and midpoint are important determinants of postprandial glycemic control at a population level,” Neil Tsereteli, MD, Lund University Diabetes Centre, Malmo, Sweden, and colleagues wrote in their article, published online Nov. 30, 2021, in Diabetologia.

“And [the results] suggest that one-size-fits-all sleep recommendations are suboptimal, particularly in the context of postprandial glycemic control, a key component of diabetes prevention,” they added.
 

Prior research on sleep quality and control of glucose lacking

Diet, exercise, and sleep are fundamental components of a healthy lifestyle; however, the role that sleep plays in affecting blood glucose control in generally healthy people has been studied little so far, the researchers wrote.

Sleep disorders can act as a measure of general health as they often occur alongside other health problems. Sleep quality also has a direct causal effect on many conditions such as cardiovascular disease, obesity, and type 2 diabetes. And disturbed sleep caused by conditions such as obstructive sleep apnea is associated with the prevalence of type 2 diabetes and risk of associated complications.

This and other evidence suggest a strong link between glucose regulation and the quality and duration of sleep.

Dr. Tsereteli and colleagues set out to examine this further in the Personalized Responses to Dietary Composition Trial 1, which involved 953 healthy adults who consumed standardized meals over 2 weeks in a clinic setting and at home.

“The meals were consumed either for breakfast or lunch in a randomized meal order and consisted of eight different standardized meals,”  the researchers wrote.

Activity and sleep were monitored using a wearable device with an accelerometer. Postprandial blood glucose levels were measured using a continuous glucose monitor.

Sleep variables including quality, duration, and timing and their impact on glycemic response to breakfast the following morning, and were compared between participants and within each individual.
 

Better sleep efficiency, better glucose control

The study found that, although there was no significant association between length of sleep period and postmeal glycemic response, there was a significant interaction when the nutritional content of the breakfast meal was also considered.

Longer sleep periods were associated with lower blood glucose following high-carbohydrate and high-fat breakfasts, indicating better blood glucose control.

Additionally, the researchers observed a within-person effect in which a study participant who slept for longer than they typically would was likely to have reduced postprandial blood glucose following a high-carbohydrate or high-fat breakfast the next day.

The authors also found a significant link between sleep efficiency (ratio of time asleep to total length of sleep period) and glycemic control. When a participant slept more efficiently than usual, their postprandial blood glucose also tended to be lower than usual.

“This effect was largely driven by sleep onset (going to bed later) rather than sleep offset (waking up later),” Dr. Tsereteli and colleagues noted.
 

Sleep a key pillar of health

Asked whether these particular sleep effects might be exacerbated in patients with diabetes, senior author Paul Franks, MD, also from the Lund University Diabetes Centre, felt they could not meaningfully extrapolate results to people with diabetes, given that many take glucose-lowering medications.

“However, it is likely that these results would be similar or exacerbated in people with prediabetes, as glucose fluctuations in this subgroup of patients are generally greater than in people with normoglycemia,” he noted in an interview.

“Sleep is a key pillar of health, and focusing on both sleep and diet is key for healthy blood glucose control,” he added.

“Compensating for a bad night’s sleep by consuming a very sugary breakfast or energy drinks is likely to be especially detrimental for blood glucose control,” Dr. Franks said.

The study was funded by Lund University. Dr. Tsereteli and Dr. Franks reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Going to bed later than usual and/or getting a poor night’s sleep are both associated with impaired glycemic response to breakfast the following morning in healthy adults, according to a multiple test-meal challenge study conducted over 14 days.

“Our data suggest that sleep duration, efficiency, and midpoint are important determinants of postprandial glycemic control at a population level,” Neil Tsereteli, MD, Lund University Diabetes Centre, Malmo, Sweden, and colleagues wrote in their article, published online Nov. 30, 2021, in Diabetologia.

“And [the results] suggest that one-size-fits-all sleep recommendations are suboptimal, particularly in the context of postprandial glycemic control, a key component of diabetes prevention,” they added.
 

Prior research on sleep quality and control of glucose lacking

Diet, exercise, and sleep are fundamental components of a healthy lifestyle; however, the role that sleep plays in affecting blood glucose control in generally healthy people has been studied little so far, the researchers wrote.

Sleep disorders can act as a measure of general health as they often occur alongside other health problems. Sleep quality also has a direct causal effect on many conditions such as cardiovascular disease, obesity, and type 2 diabetes. And disturbed sleep caused by conditions such as obstructive sleep apnea is associated with the prevalence of type 2 diabetes and risk of associated complications.

This and other evidence suggest a strong link between glucose regulation and the quality and duration of sleep.

Dr. Tsereteli and colleagues set out to examine this further in the Personalized Responses to Dietary Composition Trial 1, which involved 953 healthy adults who consumed standardized meals over 2 weeks in a clinic setting and at home.

“The meals were consumed either for breakfast or lunch in a randomized meal order and consisted of eight different standardized meals,”  the researchers wrote.

Activity and sleep were monitored using a wearable device with an accelerometer. Postprandial blood glucose levels were measured using a continuous glucose monitor.

Sleep variables including quality, duration, and timing and their impact on glycemic response to breakfast the following morning, and were compared between participants and within each individual.
 

Better sleep efficiency, better glucose control

The study found that, although there was no significant association between length of sleep period and postmeal glycemic response, there was a significant interaction when the nutritional content of the breakfast meal was also considered.

Longer sleep periods were associated with lower blood glucose following high-carbohydrate and high-fat breakfasts, indicating better blood glucose control.

Additionally, the researchers observed a within-person effect in which a study participant who slept for longer than they typically would was likely to have reduced postprandial blood glucose following a high-carbohydrate or high-fat breakfast the next day.

The authors also found a significant link between sleep efficiency (ratio of time asleep to total length of sleep period) and glycemic control. When a participant slept more efficiently than usual, their postprandial blood glucose also tended to be lower than usual.

“This effect was largely driven by sleep onset (going to bed later) rather than sleep offset (waking up later),” Dr. Tsereteli and colleagues noted.
 

Sleep a key pillar of health

Asked whether these particular sleep effects might be exacerbated in patients with diabetes, senior author Paul Franks, MD, also from the Lund University Diabetes Centre, felt they could not meaningfully extrapolate results to people with diabetes, given that many take glucose-lowering medications.

“However, it is likely that these results would be similar or exacerbated in people with prediabetes, as glucose fluctuations in this subgroup of patients are generally greater than in people with normoglycemia,” he noted in an interview.

“Sleep is a key pillar of health, and focusing on both sleep and diet is key for healthy blood glucose control,” he added.

“Compensating for a bad night’s sleep by consuming a very sugary breakfast or energy drinks is likely to be especially detrimental for blood glucose control,” Dr. Franks said.

The study was funded by Lund University. Dr. Tsereteli and Dr. Franks reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Clinicians need to pay more attention to high levels of lipoprotein cholesterol (LDL-C) – a marker of cardiovascular disease (CVD) risk – in patients with type 2 diabetes, a new population-based study in Finland suggests.

In the study, recently published online in Scientific Reports , the authors showed that LDL-C control and statin prescriptions remain suboptimal in this patient population in clinical practice.

They identified four 5-year trajectories of LDL-C along with concurrent levels of statin treatment. The percentages of patients in each group were:

• Moderately stable LDL-C: 2.3 mmol/L (90 mg/dL): 86%  
• High stable LDL-C: 3.9 mmol/L (152 mg/dL): 7.7%
• Decreasing LDL-C: 3.8%
• Increasing LDL-C: 2.5% 

“The second-largest group consisted of predominantly untreated patients (7.7%) with alarmingly ‘high stable’ LDL-C levels around 3.9 mmol/L,” the researchers noted.

And among patients with “increasing” LDL-C cholesterol, statin treatment “declined drastically.”

Moreover, 42% of patients had no statins prescribed at the end of follow-up.

These findings show that “efforts to control LDL-C should be increased – especially in patients with continuously elevated levels – by initiating and intensifying statin treatment earlier and reinitiating the treatment after discontinuation, if possible,” lead author Laura Inglin, MPH, told this news organization.
 

Discuss risks vs. benefits of statins with patients

Patients may not understand the benefits versus potential side effects of statins, said Ms. Inglin, of the Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio.

To improve management of cholesterol levels, she said, “clinician-patient discussions are crucial, addressing risk/benefits and treatment goals, and offering reputable sources” of information about statins.

When patients discontinue statin treatment, Ms. Inglin continued, “physicians should try to reinitiate another statin or to lower the dose if possible, following guidelines on how to do that,” as other research has reported that more than 70% of patients who stopped a statin because of side effects tolerated it when it was restarted.

The study also identified gender differences, she continued. Compared with men, women had significantly higher average LDL-C levels, but were less likely to be prescribed a statin or were prescribed a lower-dose statin, and they were more likely to discontinue statin therapy. 
 

Four LDL-C trajectories with statin treatment differences

Suboptimal lipid profiles, especially elevated LDL-C, are strongly associated with atherosclerotic CVD in individuals with type 2 diabetes, Ms. Inglin and colleagues write.

“To prevent or at least delay complications, regular follow-up visits and good control of A1c, LDL-C, blood pressure, and other CVD risk factors are vital in diabetes management,” they continued. “Guidelines have consistently identified statins as the principal lipid-lowering therapy, recommended particularly at moderate- to high-intensity.” 

The researchers aimed to identify LDL-C level trajectories and concomitant statin treatment in patients with type 2 diabetes.

They identified 8,592 patients – 4,622 men (54%) and 3,970 women (46%) – with type 2 diabetes seen by primary care physicians or specialists in North Karelia, Eastern Finland, during 2011-2017.

As with other international guidelines, the Finnish Current Care Guideline recommended assessing LDL-C levels every 1-3 years in patients with type 2 diabetes, with LDL-C treatment targets of < 2.5 mmol/L (< 100 mg/dL) for those at high CVD risk due to diabetes, and targets of < 1.8 mmol/L (< 70 mg/dL) or a 50% reduction from baseline in those at very high CVD risk due to additional risk factors.

At baseline, on average, men in the current study were aged 66 years and had had diabetes for 8 years; 60% were receiving a statin and 56% had an LDL-C < 2.5 mmol/L.

Women were, on average, age 69 years and had had diabetes for 8 years; 56% were receiving a statin and 51% had an LDL-C < 2.5 mmol/L.

The researchers identified the four distinct LDL-C trajectories, each with differences in statin treatment.

In the “moderate-stable” LDL-C group, 67% of men and 64% of women were receiving a statin, and the rates of high-intensity statin increased in both men and women.

In the “high-stable” LDL-C group, rates of statin use decreased from 42% to 27% among men and from 34% to 23% among women.

In the “decreasing” LDL-C group, the proportion of patients who received a statin increased; the percentage of patients who received a high-intensity statin also increased among men (6.2% to 29%) and women (7.7% to 14%).

In the “increasing” LDL-C group, the percentage of patients receiving a statin decreased from more than 64% to less than 43%.

“Physicians should increase efforts to achieve the LDL-C treatment targets – especially in the patient group with constantly elevated LDL-C levels – by paying attention to earlier initiation of statin treatment, intensification of treatments when necessary, and reinitiating if possible,” the researchers reiterated.

“The results of our study may support physicians to identify patients who need to be monitored more closely beyond a single time point measurement,” they concluded.

The study was partly funded by the Strategic Research Council of the Academy of Finland (project IMPRO), the Finnish Diabetes Association, and the Research Committee of the Kuopio University Hospital Catchment Area for the State Research Funding (project QCARE). The authors have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Clinicians need to pay more attention to high levels of lipoprotein cholesterol (LDL-C) – a marker of cardiovascular disease (CVD) risk – in patients with type 2 diabetes, a new population-based study in Finland suggests.

In the study, recently published online in Scientific Reports , the authors showed that LDL-C control and statin prescriptions remain suboptimal in this patient population in clinical practice.

They identified four 5-year trajectories of LDL-C along with concurrent levels of statin treatment. The percentages of patients in each group were:

• Moderately stable LDL-C: 2.3 mmol/L (90 mg/dL): 86%  
• High stable LDL-C: 3.9 mmol/L (152 mg/dL): 7.7%
• Decreasing LDL-C: 3.8%
• Increasing LDL-C: 2.5% 

“The second-largest group consisted of predominantly untreated patients (7.7%) with alarmingly ‘high stable’ LDL-C levels around 3.9 mmol/L,” the researchers noted.

And among patients with “increasing” LDL-C cholesterol, statin treatment “declined drastically.”

Moreover, 42% of patients had no statins prescribed at the end of follow-up.

These findings show that “efforts to control LDL-C should be increased – especially in patients with continuously elevated levels – by initiating and intensifying statin treatment earlier and reinitiating the treatment after discontinuation, if possible,” lead author Laura Inglin, MPH, told this news organization.
 

Discuss risks vs. benefits of statins with patients

Patients may not understand the benefits versus potential side effects of statins, said Ms. Inglin, of the Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio.

To improve management of cholesterol levels, she said, “clinician-patient discussions are crucial, addressing risk/benefits and treatment goals, and offering reputable sources” of information about statins.

When patients discontinue statin treatment, Ms. Inglin continued, “physicians should try to reinitiate another statin or to lower the dose if possible, following guidelines on how to do that,” as other research has reported that more than 70% of patients who stopped a statin because of side effects tolerated it when it was restarted.

The study also identified gender differences, she continued. Compared with men, women had significantly higher average LDL-C levels, but were less likely to be prescribed a statin or were prescribed a lower-dose statin, and they were more likely to discontinue statin therapy. 
 

Four LDL-C trajectories with statin treatment differences

Suboptimal lipid profiles, especially elevated LDL-C, are strongly associated with atherosclerotic CVD in individuals with type 2 diabetes, Ms. Inglin and colleagues write.

“To prevent or at least delay complications, regular follow-up visits and good control of A1c, LDL-C, blood pressure, and other CVD risk factors are vital in diabetes management,” they continued. “Guidelines have consistently identified statins as the principal lipid-lowering therapy, recommended particularly at moderate- to high-intensity.” 

The researchers aimed to identify LDL-C level trajectories and concomitant statin treatment in patients with type 2 diabetes.

They identified 8,592 patients – 4,622 men (54%) and 3,970 women (46%) – with type 2 diabetes seen by primary care physicians or specialists in North Karelia, Eastern Finland, during 2011-2017.

As with other international guidelines, the Finnish Current Care Guideline recommended assessing LDL-C levels every 1-3 years in patients with type 2 diabetes, with LDL-C treatment targets of < 2.5 mmol/L (< 100 mg/dL) for those at high CVD risk due to diabetes, and targets of < 1.8 mmol/L (< 70 mg/dL) or a 50% reduction from baseline in those at very high CVD risk due to additional risk factors.

At baseline, on average, men in the current study were aged 66 years and had had diabetes for 8 years; 60% were receiving a statin and 56% had an LDL-C < 2.5 mmol/L.

Women were, on average, age 69 years and had had diabetes for 8 years; 56% were receiving a statin and 51% had an LDL-C < 2.5 mmol/L.

The researchers identified the four distinct LDL-C trajectories, each with differences in statin treatment.

In the “moderate-stable” LDL-C group, 67% of men and 64% of women were receiving a statin, and the rates of high-intensity statin increased in both men and women.

In the “high-stable” LDL-C group, rates of statin use decreased from 42% to 27% among men and from 34% to 23% among women.

In the “decreasing” LDL-C group, the proportion of patients who received a statin increased; the percentage of patients who received a high-intensity statin also increased among men (6.2% to 29%) and women (7.7% to 14%).

In the “increasing” LDL-C group, the percentage of patients receiving a statin decreased from more than 64% to less than 43%.

“Physicians should increase efforts to achieve the LDL-C treatment targets – especially in the patient group with constantly elevated LDL-C levels – by paying attention to earlier initiation of statin treatment, intensification of treatments when necessary, and reinitiating if possible,” the researchers reiterated.

“The results of our study may support physicians to identify patients who need to be monitored more closely beyond a single time point measurement,” they concluded.

The study was partly funded by the Strategic Research Council of the Academy of Finland (project IMPRO), the Finnish Diabetes Association, and the Research Committee of the Kuopio University Hospital Catchment Area for the State Research Funding (project QCARE). The authors have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Clinicians need to pay more attention to high levels of lipoprotein cholesterol (LDL-C) – a marker of cardiovascular disease (CVD) risk – in patients with type 2 diabetes, a new population-based study in Finland suggests.

In the study, recently published online in Scientific Reports , the authors showed that LDL-C control and statin prescriptions remain suboptimal in this patient population in clinical practice.

They identified four 5-year trajectories of LDL-C along with concurrent levels of statin treatment. The percentages of patients in each group were:

• Moderately stable LDL-C: 2.3 mmol/L (90 mg/dL): 86%  
• High stable LDL-C: 3.9 mmol/L (152 mg/dL): 7.7%
• Decreasing LDL-C: 3.8%
• Increasing LDL-C: 2.5% 

“The second-largest group consisted of predominantly untreated patients (7.7%) with alarmingly ‘high stable’ LDL-C levels around 3.9 mmol/L,” the researchers noted.

And among patients with “increasing” LDL-C cholesterol, statin treatment “declined drastically.”

Moreover, 42% of patients had no statins prescribed at the end of follow-up.

These findings show that “efforts to control LDL-C should be increased – especially in patients with continuously elevated levels – by initiating and intensifying statin treatment earlier and reinitiating the treatment after discontinuation, if possible,” lead author Laura Inglin, MPH, told this news organization.
 

Discuss risks vs. benefits of statins with patients

Patients may not understand the benefits versus potential side effects of statins, said Ms. Inglin, of the Institute of Public Health and Clinical Nutrition, University of Eastern Finland, Kuopio.

To improve management of cholesterol levels, she said, “clinician-patient discussions are crucial, addressing risk/benefits and treatment goals, and offering reputable sources” of information about statins.

When patients discontinue statin treatment, Ms. Inglin continued, “physicians should try to reinitiate another statin or to lower the dose if possible, following guidelines on how to do that,” as other research has reported that more than 70% of patients who stopped a statin because of side effects tolerated it when it was restarted.

The study also identified gender differences, she continued. Compared with men, women had significantly higher average LDL-C levels, but were less likely to be prescribed a statin or were prescribed a lower-dose statin, and they were more likely to discontinue statin therapy. 
 

Four LDL-C trajectories with statin treatment differences

Suboptimal lipid profiles, especially elevated LDL-C, are strongly associated with atherosclerotic CVD in individuals with type 2 diabetes, Ms. Inglin and colleagues write.

“To prevent or at least delay complications, regular follow-up visits and good control of A1c, LDL-C, blood pressure, and other CVD risk factors are vital in diabetes management,” they continued. “Guidelines have consistently identified statins as the principal lipid-lowering therapy, recommended particularly at moderate- to high-intensity.” 

The researchers aimed to identify LDL-C level trajectories and concomitant statin treatment in patients with type 2 diabetes.

They identified 8,592 patients – 4,622 men (54%) and 3,970 women (46%) – with type 2 diabetes seen by primary care physicians or specialists in North Karelia, Eastern Finland, during 2011-2017.

As with other international guidelines, the Finnish Current Care Guideline recommended assessing LDL-C levels every 1-3 years in patients with type 2 diabetes, with LDL-C treatment targets of < 2.5 mmol/L (< 100 mg/dL) for those at high CVD risk due to diabetes, and targets of < 1.8 mmol/L (< 70 mg/dL) or a 50% reduction from baseline in those at very high CVD risk due to additional risk factors.

At baseline, on average, men in the current study were aged 66 years and had had diabetes for 8 years; 60% were receiving a statin and 56% had an LDL-C < 2.5 mmol/L.

Women were, on average, age 69 years and had had diabetes for 8 years; 56% were receiving a statin and 51% had an LDL-C < 2.5 mmol/L.

The researchers identified the four distinct LDL-C trajectories, each with differences in statin treatment.

In the “moderate-stable” LDL-C group, 67% of men and 64% of women were receiving a statin, and the rates of high-intensity statin increased in both men and women.

In the “high-stable” LDL-C group, rates of statin use decreased from 42% to 27% among men and from 34% to 23% among women.

In the “decreasing” LDL-C group, the proportion of patients who received a statin increased; the percentage of patients who received a high-intensity statin also increased among men (6.2% to 29%) and women (7.7% to 14%).

In the “increasing” LDL-C group, the percentage of patients receiving a statin decreased from more than 64% to less than 43%.

“Physicians should increase efforts to achieve the LDL-C treatment targets – especially in the patient group with constantly elevated LDL-C levels – by paying attention to earlier initiation of statin treatment, intensification of treatments when necessary, and reinitiating if possible,” the researchers reiterated.

“The results of our study may support physicians to identify patients who need to be monitored more closely beyond a single time point measurement,” they concluded.

The study was partly funded by the Strategic Research Council of the Academy of Finland (project IMPRO), the Finnish Diabetes Association, and the Research Committee of the Kuopio University Hospital Catchment Area for the State Research Funding (project QCARE). The authors have reported no relevant financial relationships.

A version of this article first appeared on Medscape.com.

Children diagnosed with type 2 diabetes (T2D) appear significantly more likely to develop retinopathy and other ocular complications over time than children who are diagnosed with type 1 diabetes (T1D), researchers report.

Among a population-based cohort of children (defined as younger than 22 years), the risk of diabetic retinopathy was 88% greater in those with T2D than T1D within the first 15 years of disease diagnosis.

“The purpose of this study was to assess the risk of developing diabetes-associated ocular complications among a population-based cohort of children diagnosed with either T1D or T2D during a 50-year period,” lead author Patricia Bai, BA, of Mayo Clinic, Phoenix, and colleagues reported in JAMA Ophthalmology.

The researchers retrospectively reviewed medical records from all residents of Olmsted County, Minn., from 1970 to 2019. The study cohort included 606 children with a confirmed a diagnosis of T1D or T2D, 525 (87%) of whom had at least one ocular examination.

The mean age at diabetes diagnosis was 12 years (standard deviation, 5.4 years); most participants were White (95.7% in 1990), and half (50%) were male. Diabetes-associated ocular complications occurred in 31.9% and 26.6% of children with T1D and T2D, respectively.

The hazard ratios illustrating the risk between T2D and T1D rates were 1.88 (95% confidence interval, 1.13-3.12; P = .02) for any diabetic retinopathy, 2.33 (95% CI, 0.99-5.50; P = .048) for proliferative diabetic retinopathy, 1.49 (95% CI, 0.46-4.89; P = .50) for diabetic macular edema, 2.43 (95% CI, 0.54-11.07; P = .24) for a visually significant cataract, and 4.06 (95% CI, 1.34-12.33; P = .007) for requiring pars plana vitrectomy within the first 15 years of diagnosis.

These results suggest that earlier surveillance and intervention may help prevent vision-threatening complications, the researchers explained.

“After adjusting for race using self-identified categories of White or not White, the adjusted HR of developing any retinopathy was 1.63 (95% CI, 0.96-2.79; P = .07), and the adjusted HR of developing proliferative diabetic retinopathy was 2.02 (95% CI, 0.79-5.16; P = .14)” in T2D versus T1D patients, the researchers wrote.

“We would expect the reported rate of type 2 diabetes to be potentially underestimated in our study cohort,” Ms. Bai commented in an interview. “Race has been suggested to be a surrogate for other social determinants of health, such as lower rates of optimal follow-up care received by racial and ethnic minorities, which could influence subsequent retinopathy rates.”
 

Understanding retinopathy outcomes in youth

In an accompanying editorial, Jennifer K. Sun, MD, MPH, from Harvard Medical School, Boston, wrote that the present study indicates the natural history of retinopathy may differ between patients with T1D and T2D.

While the pathophysiology of diabetic retinopathy in T1D and T2D appears similar, other patient-related factors such as lipid profiles, the presence of hypertension, and body mass index may differ between the two disease states.

She wrote that “there is a particular need to document retinopathy outcomes and risk factors for advanced disease in youth with T2D, for whom there is a paucity of information.”

Ms. Bai and colleagues acknowledged that a key limitation of the study was the retrospective design. As a result, irregular follow-up and incomplete data may limit the applicability of the findings.

“Some children with milder forms of diabetes may have eluded detection, a limitation that is more likely to affect T2D, which may exist undetected for years before a diagnosis,” Bai explained.

Dr. Sun recommended that further epidemiologic studies are needed to help optimize guidelines for screening and follow-up for young people diagnosed with diabetes. “Such efforts may potentially lead to increased understanding of the mechanistic differences between pathology in T1D versus T2D,” she concluded.

This study used the resources of the Rochester Epidemiology Project (REP) medical records linkage system, which is supported by grant funding from the National Institute on Aging, the Mayo Clinic Research Committee, and by fees paid annually by REP users. The study authors disclosed no conflicts of interest.

Children diagnosed with type 2 diabetes (T2D) appear significantly more likely to develop retinopathy and other ocular complications over time than children who are diagnosed with type 1 diabetes (T1D), researchers report.

Among a population-based cohort of children (defined as younger than 22 years), the risk of diabetic retinopathy was 88% greater in those with T2D than T1D within the first 15 years of disease diagnosis.

“The purpose of this study was to assess the risk of developing diabetes-associated ocular complications among a population-based cohort of children diagnosed with either T1D or T2D during a 50-year period,” lead author Patricia Bai, BA, of Mayo Clinic, Phoenix, and colleagues reported in JAMA Ophthalmology.

The researchers retrospectively reviewed medical records from all residents of Olmsted County, Minn., from 1970 to 2019. The study cohort included 606 children with a confirmed a diagnosis of T1D or T2D, 525 (87%) of whom had at least one ocular examination.

The mean age at diabetes diagnosis was 12 years (standard deviation, 5.4 years); most participants were White (95.7% in 1990), and half (50%) were male. Diabetes-associated ocular complications occurred in 31.9% and 26.6% of children with T1D and T2D, respectively.

The hazard ratios illustrating the risk between T2D and T1D rates were 1.88 (95% confidence interval, 1.13-3.12; P = .02) for any diabetic retinopathy, 2.33 (95% CI, 0.99-5.50; P = .048) for proliferative diabetic retinopathy, 1.49 (95% CI, 0.46-4.89; P = .50) for diabetic macular edema, 2.43 (95% CI, 0.54-11.07; P = .24) for a visually significant cataract, and 4.06 (95% CI, 1.34-12.33; P = .007) for requiring pars plana vitrectomy within the first 15 years of diagnosis.

These results suggest that earlier surveillance and intervention may help prevent vision-threatening complications, the researchers explained.

“After adjusting for race using self-identified categories of White or not White, the adjusted HR of developing any retinopathy was 1.63 (95% CI, 0.96-2.79; P = .07), and the adjusted HR of developing proliferative diabetic retinopathy was 2.02 (95% CI, 0.79-5.16; P = .14)” in T2D versus T1D patients, the researchers wrote.

“We would expect the reported rate of type 2 diabetes to be potentially underestimated in our study cohort,” Ms. Bai commented in an interview. “Race has been suggested to be a surrogate for other social determinants of health, such as lower rates of optimal follow-up care received by racial and ethnic minorities, which could influence subsequent retinopathy rates.”
 

Understanding retinopathy outcomes in youth

In an accompanying editorial, Jennifer K. Sun, MD, MPH, from Harvard Medical School, Boston, wrote that the present study indicates the natural history of retinopathy may differ between patients with T1D and T2D.

While the pathophysiology of diabetic retinopathy in T1D and T2D appears similar, other patient-related factors such as lipid profiles, the presence of hypertension, and body mass index may differ between the two disease states.

She wrote that “there is a particular need to document retinopathy outcomes and risk factors for advanced disease in youth with T2D, for whom there is a paucity of information.”

Ms. Bai and colleagues acknowledged that a key limitation of the study was the retrospective design. As a result, irregular follow-up and incomplete data may limit the applicability of the findings.

“Some children with milder forms of diabetes may have eluded detection, a limitation that is more likely to affect T2D, which may exist undetected for years before a diagnosis,” Bai explained.

Dr. Sun recommended that further epidemiologic studies are needed to help optimize guidelines for screening and follow-up for young people diagnosed with diabetes. “Such efforts may potentially lead to increased understanding of the mechanistic differences between pathology in T1D versus T2D,” she concluded.

This study used the resources of the Rochester Epidemiology Project (REP) medical records linkage system, which is supported by grant funding from the National Institute on Aging, the Mayo Clinic Research Committee, and by fees paid annually by REP users. The study authors disclosed no conflicts of interest.

Children diagnosed with type 2 diabetes (T2D) appear significantly more likely to develop retinopathy and other ocular complications over time than children who are diagnosed with type 1 diabetes (T1D), researchers report.

Among a population-based cohort of children (defined as younger than 22 years), the risk of diabetic retinopathy was 88% greater in those with T2D than T1D within the first 15 years of disease diagnosis.

“The purpose of this study was to assess the risk of developing diabetes-associated ocular complications among a population-based cohort of children diagnosed with either T1D or T2D during a 50-year period,” lead author Patricia Bai, BA, of Mayo Clinic, Phoenix, and colleagues reported in JAMA Ophthalmology.

The researchers retrospectively reviewed medical records from all residents of Olmsted County, Minn., from 1970 to 2019. The study cohort included 606 children with a confirmed a diagnosis of T1D or T2D, 525 (87%) of whom had at least one ocular examination.

The mean age at diabetes diagnosis was 12 years (standard deviation, 5.4 years); most participants were White (95.7% in 1990), and half (50%) were male. Diabetes-associated ocular complications occurred in 31.9% and 26.6% of children with T1D and T2D, respectively.

The hazard ratios illustrating the risk between T2D and T1D rates were 1.88 (95% confidence interval, 1.13-3.12; P = .02) for any diabetic retinopathy, 2.33 (95% CI, 0.99-5.50; P = .048) for proliferative diabetic retinopathy, 1.49 (95% CI, 0.46-4.89; P = .50) for diabetic macular edema, 2.43 (95% CI, 0.54-11.07; P = .24) for a visually significant cataract, and 4.06 (95% CI, 1.34-12.33; P = .007) for requiring pars plana vitrectomy within the first 15 years of diagnosis.

These results suggest that earlier surveillance and intervention may help prevent vision-threatening complications, the researchers explained.

“After adjusting for race using self-identified categories of White or not White, the adjusted HR of developing any retinopathy was 1.63 (95% CI, 0.96-2.79; P = .07), and the adjusted HR of developing proliferative diabetic retinopathy was 2.02 (95% CI, 0.79-5.16; P = .14)” in T2D versus T1D patients, the researchers wrote.

“We would expect the reported rate of type 2 diabetes to be potentially underestimated in our study cohort,” Ms. Bai commented in an interview. “Race has been suggested to be a surrogate for other social determinants of health, such as lower rates of optimal follow-up care received by racial and ethnic minorities, which could influence subsequent retinopathy rates.”
 

Understanding retinopathy outcomes in youth

In an accompanying editorial, Jennifer K. Sun, MD, MPH, from Harvard Medical School, Boston, wrote that the present study indicates the natural history of retinopathy may differ between patients with T1D and T2D.

While the pathophysiology of diabetic retinopathy in T1D and T2D appears similar, other patient-related factors such as lipid profiles, the presence of hypertension, and body mass index may differ between the two disease states.

She wrote that “there is a particular need to document retinopathy outcomes and risk factors for advanced disease in youth with T2D, for whom there is a paucity of information.”

Ms. Bai and colleagues acknowledged that a key limitation of the study was the retrospective design. As a result, irregular follow-up and incomplete data may limit the applicability of the findings.

“Some children with milder forms of diabetes may have eluded detection, a limitation that is more likely to affect T2D, which may exist undetected for years before a diagnosis,” Bai explained.

Dr. Sun recommended that further epidemiologic studies are needed to help optimize guidelines for screening and follow-up for young people diagnosed with diabetes. “Such efforts may potentially lead to increased understanding of the mechanistic differences between pathology in T1D versus T2D,” she concluded.

This study used the resources of the Rochester Epidemiology Project (REP) medical records linkage system, which is supported by grant funding from the National Institute on Aging, the Mayo Clinic Research Committee, and by fees paid annually by REP users. The study authors disclosed no conflicts of interest.

Patients with cardiac implantable electronic devices (CIEDs) who received treatment with an sodium-glucose cotransporter 2 inhibitor had significantly fewer atrial arrhythmia events, compared with those who never received such a drug, in a prospective analysis of nearly 14,000 patients with a device who were followed for an average of nearly 2 years.

The findings suggest that use of an agent from the class of SGLT2 inhibitors “is associated with a pronounced reduction in atrial arrhythmia burden and all-cause mortality in patients with a CIED in a real-world setting,” said Ilan Goldenberg, MD, at the American Heart Association scientific sessions. “These data indicate possible antiarrhythmic properties of SGLT2 inhibitors that are incremental to the beneficial effects of the drug on heart failure outcomes,” added Dr. Goldenberg, director of the Clinical Cardiovascular Research Center at the University of Rochester (N.Y.).

In a propensity score–matched analysis that included more than 5,000 of the enrolled patients with a CIED, treatment with an SGLT2 inhibitor was tied to a significant 23% relative reduction in atrial arrhythmia events and a 44% relative drop in all-cause death, he reported.
 

Effect mediated by reduced left atrial pressure?

“Other heart failure drugs have shown some decrease in the rate of sudden cardiac death, but this is the first [heart failure] drug to associate with a reduction in atrial arrhythmias,” Dr. Goldenberg noted. “We think that a reduction in left atrial pressure” produced by treatment with an SGLT2 inhibitor “may be linked to the reduction in atrial arrhythmias.”

The study did not show an association of SGLT2-inhibitor use and a change in ventricular arrhythmias, compared with patients with CIEDs who did not receive an agent from this class.

The findings suggest “expanding the possible indications for SGLT2 inhibitors,” commented Harriette G.C. Van Spall, MD, a cardiologist at McMaster University, Hamilton, Ont., who moderated the session where Dr. Goldenberg gave his report.

The study included 13,890 consecutive, prospectively enrolled patients who received a CIED during January 2015–April 2020 at any of five hospitals operated by either of two tertiary health care systems, one run by the University of Rochester and the second based at Sheba Medical Center in Tel HaShomer, Israel. The devices that made patients eligible for the study included permanent pacemakers, implantable cardioverter defibrillators, cardiac resynchronization therapy devices, and implantable cardiac monitors. A blinded adjudication committee composed of electrophysiologists identified the arrhythmic episodes.

At entry into the study (the time of device implantation), 12,992 patients were not receiving an SGLT2 inhibitor (94%) and 898 (6%) were receiving a drug from this class. Of those, 39% were on dapagliflozin (Farxiga), 35% were on empagliflozin (Jardiance), and 26% were on canagliflozin (Invokana).

Patients receiving an SGLT2 inhibitor at baseline were on average substantially younger than the patients not on this drug class (59 years vs. 69 years); they had a substantially higher prevalence of diabetes (78% vs. 25%), and ischemic cardiomyopathy (63% vs. 39%). Patients on an SGLT2 inhibitor at baseline also had more modestly higher prevalence rates of prior heart failure (38% vs. 31%), and hypertension (69% vs. 63%). Prevalence of a history of atrial fibrillation (AFib) was nearly the same in both groups: 31% in patients on an SGLT2 inhibitor and 35% in those not on these drugs.

The study’s primary endpoint was the total number of arrhythmia events during follow-up of 24,442 patient-years, during which patients exhibited 19,633 atrial arrhythmia events and 3,231 ventricular arrhythmia events.
 

1% absolute reduction in atrial arrhythmias

A multivariate analysis of the entire population – adjusted for baseline differences in age, diabetes, sex, and history of AFib – showed that treatment with an SGLT2 inhibitor at baseline was linked with a significant 24% relative reduction in incident atrial arrhythmia events, a significant 24% reduction in both atrial and ventricular arrhythmia events, and a 42% relative reduction in all-cause deaths, compared with no SGLT2-inhibitor treatment.

The only analyzed endpoint that showed no significant between-group difference was incidence of ventricular arrhythmias, which was a relative 7% lower in the SGLT2-inhibitor group.

On an absolute basis, treatment with an SGLT2 inhibitor was tied to about a 1% lower rate of atrial arrhythmia events per year, a reduction from a 2.5% rate in those not on an SGLT2 inhibitor to about a 1.5% rate in those taking this drug class.

A second, confirmatory analysis used propensity score matching to identify 5,323 patients not on an SGLT2 inhibitor at baseline who closely matched the 898 patients on an SGLT2 inhibitor. The multivariate modeling for this analysis also adjusted for age, diabetes, sex, and history of AFib.

The results of these analyses closely matched the calculations that used the entire study population. Relative to patients not on an SGLT2 inhibitor those on a drug from this class had 23% fewer atrial arrhythmias, 44% fewer total death, and 22% fewer atrial or ventricular arrhythmias, all significant differences. However, ventricular arrhythmias only reduced by a relative 5%, a nonsignificant difference.

In the propensity score–matched analysis, the absolute reduction in atrial arrhythmias in those on an SGLT2 inhibitor at baseline was roughly 1.3% fewer per year, compared with those not on this drug class.

The study was funded by an unrestricted grant to the University of Rochester from AstraZeneca, the company that markets the SGLT2 inhibitor dapagliflozin (Farxiga). Dr. Goldenberg and Dr. Van Spall had no disclosures.

[email protected]

Patients with cardiac implantable electronic devices (CIEDs) who received treatment with an sodium-glucose cotransporter 2 inhibitor had significantly fewer atrial arrhythmia events, compared with those who never received such a drug, in a prospective analysis of nearly 14,000 patients with a device who were followed for an average of nearly 2 years.

The findings suggest that use of an agent from the class of SGLT2 inhibitors “is associated with a pronounced reduction in atrial arrhythmia burden and all-cause mortality in patients with a CIED in a real-world setting,” said Ilan Goldenberg, MD, at the American Heart Association scientific sessions. “These data indicate possible antiarrhythmic properties of SGLT2 inhibitors that are incremental to the beneficial effects of the drug on heart failure outcomes,” added Dr. Goldenberg, director of the Clinical Cardiovascular Research Center at the University of Rochester (N.Y.).

In a propensity score–matched analysis that included more than 5,000 of the enrolled patients with a CIED, treatment with an SGLT2 inhibitor was tied to a significant 23% relative reduction in atrial arrhythmia events and a 44% relative drop in all-cause death, he reported.
 

Effect mediated by reduced left atrial pressure?

“Other heart failure drugs have shown some decrease in the rate of sudden cardiac death, but this is the first [heart failure] drug to associate with a reduction in atrial arrhythmias,” Dr. Goldenberg noted. “We think that a reduction in left atrial pressure” produced by treatment with an SGLT2 inhibitor “may be linked to the reduction in atrial arrhythmias.”

The study did not show an association of SGLT2-inhibitor use and a change in ventricular arrhythmias, compared with patients with CIEDs who did not receive an agent from this class.

The findings suggest “expanding the possible indications for SGLT2 inhibitors,” commented Harriette G.C. Van Spall, MD, a cardiologist at McMaster University, Hamilton, Ont., who moderated the session where Dr. Goldenberg gave his report.

The study included 13,890 consecutive, prospectively enrolled patients who received a CIED during January 2015–April 2020 at any of five hospitals operated by either of two tertiary health care systems, one run by the University of Rochester and the second based at Sheba Medical Center in Tel HaShomer, Israel. The devices that made patients eligible for the study included permanent pacemakers, implantable cardioverter defibrillators, cardiac resynchronization therapy devices, and implantable cardiac monitors. A blinded adjudication committee composed of electrophysiologists identified the arrhythmic episodes.

At entry into the study (the time of device implantation), 12,992 patients were not receiving an SGLT2 inhibitor (94%) and 898 (6%) were receiving a drug from this class. Of those, 39% were on dapagliflozin (Farxiga), 35% were on empagliflozin (Jardiance), and 26% were on canagliflozin (Invokana).

Patients receiving an SGLT2 inhibitor at baseline were on average substantially younger than the patients not on this drug class (59 years vs. 69 years); they had a substantially higher prevalence of diabetes (78% vs. 25%), and ischemic cardiomyopathy (63% vs. 39%). Patients on an SGLT2 inhibitor at baseline also had more modestly higher prevalence rates of prior heart failure (38% vs. 31%), and hypertension (69% vs. 63%). Prevalence of a history of atrial fibrillation (AFib) was nearly the same in both groups: 31% in patients on an SGLT2 inhibitor and 35% in those not on these drugs.

The study’s primary endpoint was the total number of arrhythmia events during follow-up of 24,442 patient-years, during which patients exhibited 19,633 atrial arrhythmia events and 3,231 ventricular arrhythmia events.
 

1% absolute reduction in atrial arrhythmias

A multivariate analysis of the entire population – adjusted for baseline differences in age, diabetes, sex, and history of AFib – showed that treatment with an SGLT2 inhibitor at baseline was linked with a significant 24% relative reduction in incident atrial arrhythmia events, a significant 24% reduction in both atrial and ventricular arrhythmia events, and a 42% relative reduction in all-cause deaths, compared with no SGLT2-inhibitor treatment.

The only analyzed endpoint that showed no significant between-group difference was incidence of ventricular arrhythmias, which was a relative 7% lower in the SGLT2-inhibitor group.

On an absolute basis, treatment with an SGLT2 inhibitor was tied to about a 1% lower rate of atrial arrhythmia events per year, a reduction from a 2.5% rate in those not on an SGLT2 inhibitor to about a 1.5% rate in those taking this drug class.

A second, confirmatory analysis used propensity score matching to identify 5,323 patients not on an SGLT2 inhibitor at baseline who closely matched the 898 patients on an SGLT2 inhibitor. The multivariate modeling for this analysis also adjusted for age, diabetes, sex, and history of AFib.

The results of these analyses closely matched the calculations that used the entire study population. Relative to patients not on an SGLT2 inhibitor those on a drug from this class had 23% fewer atrial arrhythmias, 44% fewer total death, and 22% fewer atrial or ventricular arrhythmias, all significant differences. However, ventricular arrhythmias only reduced by a relative 5%, a nonsignificant difference.

In the propensity score–matched analysis, the absolute reduction in atrial arrhythmias in those on an SGLT2 inhibitor at baseline was roughly 1.3% fewer per year, compared with those not on this drug class.

The study was funded by an unrestricted grant to the University of Rochester from AstraZeneca, the company that markets the SGLT2 inhibitor dapagliflozin (Farxiga). Dr. Goldenberg and Dr. Van Spall had no disclosures.

[email protected]

Patients with cardiac implantable electronic devices (CIEDs) who received treatment with an sodium-glucose cotransporter 2 inhibitor had significantly fewer atrial arrhythmia events, compared with those who never received such a drug, in a prospective analysis of nearly 14,000 patients with a device who were followed for an average of nearly 2 years.

The findings suggest that use of an agent from the class of SGLT2 inhibitors “is associated with a pronounced reduction in atrial arrhythmia burden and all-cause mortality in patients with a CIED in a real-world setting,” said Ilan Goldenberg, MD, at the American Heart Association scientific sessions. “These data indicate possible antiarrhythmic properties of SGLT2 inhibitors that are incremental to the beneficial effects of the drug on heart failure outcomes,” added Dr. Goldenberg, director of the Clinical Cardiovascular Research Center at the University of Rochester (N.Y.).

In a propensity score–matched analysis that included more than 5,000 of the enrolled patients with a CIED, treatment with an SGLT2 inhibitor was tied to a significant 23% relative reduction in atrial arrhythmia events and a 44% relative drop in all-cause death, he reported.
 

Effect mediated by reduced left atrial pressure?

“Other heart failure drugs have shown some decrease in the rate of sudden cardiac death, but this is the first [heart failure] drug to associate with a reduction in atrial arrhythmias,” Dr. Goldenberg noted. “We think that a reduction in left atrial pressure” produced by treatment with an SGLT2 inhibitor “may be linked to the reduction in atrial arrhythmias.”

The study did not show an association of SGLT2-inhibitor use and a change in ventricular arrhythmias, compared with patients with CIEDs who did not receive an agent from this class.

The findings suggest “expanding the possible indications for SGLT2 inhibitors,” commented Harriette G.C. Van Spall, MD, a cardiologist at McMaster University, Hamilton, Ont., who moderated the session where Dr. Goldenberg gave his report.

The study included 13,890 consecutive, prospectively enrolled patients who received a CIED during January 2015–April 2020 at any of five hospitals operated by either of two tertiary health care systems, one run by the University of Rochester and the second based at Sheba Medical Center in Tel HaShomer, Israel. The devices that made patients eligible for the study included permanent pacemakers, implantable cardioverter defibrillators, cardiac resynchronization therapy devices, and implantable cardiac monitors. A blinded adjudication committee composed of electrophysiologists identified the arrhythmic episodes.

At entry into the study (the time of device implantation), 12,992 patients were not receiving an SGLT2 inhibitor (94%) and 898 (6%) were receiving a drug from this class. Of those, 39% were on dapagliflozin (Farxiga), 35% were on empagliflozin (Jardiance), and 26% were on canagliflozin (Invokana).

Patients receiving an SGLT2 inhibitor at baseline were on average substantially younger than the patients not on this drug class (59 years vs. 69 years); they had a substantially higher prevalence of diabetes (78% vs. 25%), and ischemic cardiomyopathy (63% vs. 39%). Patients on an SGLT2 inhibitor at baseline also had more modestly higher prevalence rates of prior heart failure (38% vs. 31%), and hypertension (69% vs. 63%). Prevalence of a history of atrial fibrillation (AFib) was nearly the same in both groups: 31% in patients on an SGLT2 inhibitor and 35% in those not on these drugs.

The study’s primary endpoint was the total number of arrhythmia events during follow-up of 24,442 patient-years, during which patients exhibited 19,633 atrial arrhythmia events and 3,231 ventricular arrhythmia events.
 

1% absolute reduction in atrial arrhythmias

A multivariate analysis of the entire population – adjusted for baseline differences in age, diabetes, sex, and history of AFib – showed that treatment with an SGLT2 inhibitor at baseline was linked with a significant 24% relative reduction in incident atrial arrhythmia events, a significant 24% reduction in both atrial and ventricular arrhythmia events, and a 42% relative reduction in all-cause deaths, compared with no SGLT2-inhibitor treatment.

The only analyzed endpoint that showed no significant between-group difference was incidence of ventricular arrhythmias, which was a relative 7% lower in the SGLT2-inhibitor group.

On an absolute basis, treatment with an SGLT2 inhibitor was tied to about a 1% lower rate of atrial arrhythmia events per year, a reduction from a 2.5% rate in those not on an SGLT2 inhibitor to about a 1.5% rate in those taking this drug class.

A second, confirmatory analysis used propensity score matching to identify 5,323 patients not on an SGLT2 inhibitor at baseline who closely matched the 898 patients on an SGLT2 inhibitor. The multivariate modeling for this analysis also adjusted for age, diabetes, sex, and history of AFib.

The results of these analyses closely matched the calculations that used the entire study population. Relative to patients not on an SGLT2 inhibitor those on a drug from this class had 23% fewer atrial arrhythmias, 44% fewer total death, and 22% fewer atrial or ventricular arrhythmias, all significant differences. However, ventricular arrhythmias only reduced by a relative 5%, a nonsignificant difference.

In the propensity score–matched analysis, the absolute reduction in atrial arrhythmias in those on an SGLT2 inhibitor at baseline was roughly 1.3% fewer per year, compared with those not on this drug class.

The study was funded by an unrestricted grant to the University of Rochester from AstraZeneca, the company that markets the SGLT2 inhibitor dapagliflozin (Farxiga). Dr. Goldenberg and Dr. Van Spall had no disclosures.

[email protected]