Endocrinology

The number of reported cases of Fourier gangrene in patients receiving sodium-glucose cotransporter-2 (SGLT2) inhibitors has surged since the US Food and Drug Administration (FDA) issued a 2018 warning about this rare but serious infection, researchers say.

Health care providers prescribing SGLT2 inhibitors to patients with diabetes should have a high index of suspicion for the signs and symptoms of Fournier gangrene, given its substantial morbidity and mortality, according to Susan J. Bersoff-Matcha, MD, and her colleagues at the FDA.

“Although the risk for [Fournier gangrene] is low, serious infection should be considered and weighed against the benefits of SGLT2 inhibitor therapy,” said Dr. Bersoff-Matcha and co-authors in their recent report published in the Annals of Internal Medicine (2019 May 6. doi: 10.7326/M19-0085).

In the previous warning, FDA officials said 12 cases of Fournier gangrene in patients taking an SGLT2 inhibitor had been reported to the agency or in medical literature from March 2013, when the first such inhibitor was approved, and May 2018.

In this latest report, a total of 55 Fournier gangrene cases had been reported in patients receiving SGLT2 inhibitors from March 2, 2013 through January 31, 2019.

The influx of reports may have been prompted by growing awareness of the safety issue, investigators said, but could also reflect the increasing prevalence of diabetes combined with SGLT2 inhibitor use. The researchers also noted that diabetes is a comorbidity in 32% to 66% of cases of Fournier gangrene.

But the likliehood that diabetes mellitus alone causes Fournier gangrene seems unlikley, given that Dr. Bersoff-Matcha and co-authors only found 19 Fournier gangrene cases associated with other classes of antiglycemic agents reported to the FDA or in the literature over a 35-year time frame.

“If Fournier gangrene were associated only with diabetes mellitus and not SGLT2 inhibitors, we would expect far more cases reported with the other antiglycemic agents, considering the 35-year timeframe and the large number of agents,” they said in their report.

Cases were reported for all FDA-approved SGLT2 inhibitors besides ertugliflozin, an agent approved for use in the U.S. in December 2017. The lack of cases reported for this drug could be related to its limited time on the market, the investigators said.

Fournier gangrene, marked by rapidly progressing necrotizing infection of the genitalia, perineum, and perianal region, requires antibiotics and immediate surgery, according to Dr. Bersoff-Matcha and colleagues.

“Serious complications and death are likely if Fournier gangrene is not recognized immediately and surgical intervention is not carried out within the first few hours of diagnosis,” they said in the report.

Of the 55 cases reported in patients receiving SGLT2 inhibitors, 39 were men and 16 were women, with an average of 9 months from the start of treatment to the event, investigators said.

At least 25 patients required multiple surgeries, including one patient who had 17 trips to the operating room, they said. A total of 8 patients had a fecal diversion procedure, and 4 patients had skin grafting.

Six patients had multiple encounters with a provider before being diagnosed, suggesting that the provider may have not recognized the infection due to its nonspecific symptoms, which include fatigue, fever, and malaise.

“Pain that seems out of proportion to findings on physical examination is a strong clinical indicator of necrotizing fasciitis and may be the most important diagnostic clue,” Dr. Bersoff-Matcha and co-authors said in their report.

The incidence of Fournier gangrene in patients taking SGLT2 inhibitors can’t be established by these cases reported to the FDA, which are spontaneously provided by health care providers and patients, investigators said.

“We suspect that our numbers underestimate the true burden,” they said in their report.

Dr. Bersoff-Matcha and co-authors disclosed no conflicts of interest related to their report.

SOURCE: Bersoff-Matcha SJ, et al. Ann Intern Med. 2019 May 6. Doi: doi:10.7326/M19-0085.

This article was updated May 9, 2019.

The number of reported cases of Fourier gangrene in patients receiving sodium-glucose cotransporter-2 (SGLT2) inhibitors has surged since the US Food and Drug Administration (FDA) issued a 2018 warning about this rare but serious infection, researchers say.

Health care providers prescribing SGLT2 inhibitors to patients with diabetes should have a high index of suspicion for the signs and symptoms of Fournier gangrene, given its substantial morbidity and mortality, according to Susan J. Bersoff-Matcha, MD, and her colleagues at the FDA.

“Although the risk for [Fournier gangrene] is low, serious infection should be considered and weighed against the benefits of SGLT2 inhibitor therapy,” said Dr. Bersoff-Matcha and co-authors in their recent report published in the Annals of Internal Medicine (2019 May 6. doi: 10.7326/M19-0085).

In the previous warning, FDA officials said 12 cases of Fournier gangrene in patients taking an SGLT2 inhibitor had been reported to the agency or in medical literature from March 2013, when the first such inhibitor was approved, and May 2018.

In this latest report, a total of 55 Fournier gangrene cases had been reported in patients receiving SGLT2 inhibitors from March 2, 2013 through January 31, 2019.

The influx of reports may have been prompted by growing awareness of the safety issue, investigators said, but could also reflect the increasing prevalence of diabetes combined with SGLT2 inhibitor use. The researchers also noted that diabetes is a comorbidity in 32% to 66% of cases of Fournier gangrene.

But the likliehood that diabetes mellitus alone causes Fournier gangrene seems unlikley, given that Dr. Bersoff-Matcha and co-authors only found 19 Fournier gangrene cases associated with other classes of antiglycemic agents reported to the FDA or in the literature over a 35-year time frame.

“If Fournier gangrene were associated only with diabetes mellitus and not SGLT2 inhibitors, we would expect far more cases reported with the other antiglycemic agents, considering the 35-year timeframe and the large number of agents,” they said in their report.

Cases were reported for all FDA-approved SGLT2 inhibitors besides ertugliflozin, an agent approved for use in the U.S. in December 2017. The lack of cases reported for this drug could be related to its limited time on the market, the investigators said.

Fournier gangrene, marked by rapidly progressing necrotizing infection of the genitalia, perineum, and perianal region, requires antibiotics and immediate surgery, according to Dr. Bersoff-Matcha and colleagues.

“Serious complications and death are likely if Fournier gangrene is not recognized immediately and surgical intervention is not carried out within the first few hours of diagnosis,” they said in the report.

Of the 55 cases reported in patients receiving SGLT2 inhibitors, 39 were men and 16 were women, with an average of 9 months from the start of treatment to the event, investigators said.

At least 25 patients required multiple surgeries, including one patient who had 17 trips to the operating room, they said. A total of 8 patients had a fecal diversion procedure, and 4 patients had skin grafting.

Six patients had multiple encounters with a provider before being diagnosed, suggesting that the provider may have not recognized the infection due to its nonspecific symptoms, which include fatigue, fever, and malaise.

“Pain that seems out of proportion to findings on physical examination is a strong clinical indicator of necrotizing fasciitis and may be the most important diagnostic clue,” Dr. Bersoff-Matcha and co-authors said in their report.

The incidence of Fournier gangrene in patients taking SGLT2 inhibitors can’t be established by these cases reported to the FDA, which are spontaneously provided by health care providers and patients, investigators said.

“We suspect that our numbers underestimate the true burden,” they said in their report.

Dr. Bersoff-Matcha and co-authors disclosed no conflicts of interest related to their report.

SOURCE: Bersoff-Matcha SJ, et al. Ann Intern Med. 2019 May 6. Doi: doi:10.7326/M19-0085.

This article was updated May 9, 2019.

The number of reported cases of Fourier gangrene in patients receiving sodium-glucose cotransporter-2 (SGLT2) inhibitors has surged since the US Food and Drug Administration (FDA) issued a 2018 warning about this rare but serious infection, researchers say.

Health care providers prescribing SGLT2 inhibitors to patients with diabetes should have a high index of suspicion for the signs and symptoms of Fournier gangrene, given its substantial morbidity and mortality, according to Susan J. Bersoff-Matcha, MD, and her colleagues at the FDA.

“Although the risk for [Fournier gangrene] is low, serious infection should be considered and weighed against the benefits of SGLT2 inhibitor therapy,” said Dr. Bersoff-Matcha and co-authors in their recent report published in the Annals of Internal Medicine (2019 May 6. doi: 10.7326/M19-0085).

In the previous warning, FDA officials said 12 cases of Fournier gangrene in patients taking an SGLT2 inhibitor had been reported to the agency or in medical literature from March 2013, when the first such inhibitor was approved, and May 2018.

In this latest report, a total of 55 Fournier gangrene cases had been reported in patients receiving SGLT2 inhibitors from March 2, 2013 through January 31, 2019.

The influx of reports may have been prompted by growing awareness of the safety issue, investigators said, but could also reflect the increasing prevalence of diabetes combined with SGLT2 inhibitor use. The researchers also noted that diabetes is a comorbidity in 32% to 66% of cases of Fournier gangrene.

But the likliehood that diabetes mellitus alone causes Fournier gangrene seems unlikley, given that Dr. Bersoff-Matcha and co-authors only found 19 Fournier gangrene cases associated with other classes of antiglycemic agents reported to the FDA or in the literature over a 35-year time frame.

“If Fournier gangrene were associated only with diabetes mellitus and not SGLT2 inhibitors, we would expect far more cases reported with the other antiglycemic agents, considering the 35-year timeframe and the large number of agents,” they said in their report.

Cases were reported for all FDA-approved SGLT2 inhibitors besides ertugliflozin, an agent approved for use in the U.S. in December 2017. The lack of cases reported for this drug could be related to its limited time on the market, the investigators said.

Fournier gangrene, marked by rapidly progressing necrotizing infection of the genitalia, perineum, and perianal region, requires antibiotics and immediate surgery, according to Dr. Bersoff-Matcha and colleagues.

“Serious complications and death are likely if Fournier gangrene is not recognized immediately and surgical intervention is not carried out within the first few hours of diagnosis,” they said in the report.

Of the 55 cases reported in patients receiving SGLT2 inhibitors, 39 were men and 16 were women, with an average of 9 months from the start of treatment to the event, investigators said.

At least 25 patients required multiple surgeries, including one patient who had 17 trips to the operating room, they said. A total of 8 patients had a fecal diversion procedure, and 4 patients had skin grafting.

Six patients had multiple encounters with a provider before being diagnosed, suggesting that the provider may have not recognized the infection due to its nonspecific symptoms, which include fatigue, fever, and malaise.

“Pain that seems out of proportion to findings on physical examination is a strong clinical indicator of necrotizing fasciitis and may be the most important diagnostic clue,” Dr. Bersoff-Matcha and co-authors said in their report.

The incidence of Fournier gangrene in patients taking SGLT2 inhibitors can’t be established by these cases reported to the FDA, which are spontaneously provided by health care providers and patients, investigators said.

“We suspect that our numbers underestimate the true burden,” they said in their report.

Dr. Bersoff-Matcha and co-authors disclosed no conflicts of interest related to their report.

SOURCE: Bersoff-Matcha SJ, et al. Ann Intern Med. 2019 May 6. Doi: doi:10.7326/M19-0085.

This article was updated May 9, 2019.

The addition of liraglutide to metformin shows significantly improved glycemic control in children and adolescents with type 2 diabetes, compared with metformin alone, according to data presented at the Pediatric Academic Societies annual meeting in Baltimore.

The phase 3 study, which was simultaneously published in the New England Journal of Medicine, involved 134 patients aged 10-17 years with type 2 diabetes who were managing their diabetes with diet and exercise, metformin, or insulin.

Participants were randomized either to subcutaneous liraglutide – dose-escalated up to 1.8 mg/day, depending on efficacy and side effects – or placebo for 52 weeks. The first 26 weeks were double blind and the second 26 weeks were an open-label extension period.

At 26 weeks, mean glycated hemoglobin levels in the liraglutide group had decreased by 0.64 percentage points from baseline, but in the placebo group they had increased by 0.42 percentage points, representing a treatment difference of –1.06 percentage points (P less than .001). By week 52, the treatment difference between the two groups had increased to –1.30 percentage points.

William V. Tamborlane, MD, from the department of pediatrics at Yale University, New Haven, Conn., and his coauthors wrote that metformin is the approved drug of choice for pediatric patients with type 2 diabetes, and that insulin currently is the only approved option for those who do not have an adequate response to metformin monotherapy.

“This discrepancy in available treatments for youth as compared with adults persists because of a lack of successfully completed trials needed for approval of new drugs for the treatment of type 2 diabetes in children since a trial of metformin was completed in 1999,” they wrote.

The study showed that significantly more patients in the liraglutide group (63.7%) achieved glycated hemoglobin levels below 7%, compared with 36.5% of patients in the placebo group. Fasting plasma glucose levels were decreased in the liraglutide group at both 26 and 52 weeks, but had increased in the placebo group.

Although the number of reported adverse events were similar between the two groups, there were significantly more reports of gastrointestinal adverse events – particularly nausea – in patients taking liraglutide, compared with those on placebo.

However, the study did not show a difference between liraglutide and placebo in lowering body mass index, although mean body weight decreases – which were seen in both groups – were maintained at week 52 only in the liraglutide group. The authors suggested this might be owing to the relatively small number of patients enrolled in the study and that some of the children were still growing.

Novo Nordisk, which manufactures liraglutide, supported the study. Twelve authors reported grants or support from Novo Nordisk in relation to the trial. Three authors were employees of Novo Nordisk. Eight authors reported unrelated grants and fees from Novo Nordisk and other pharmaceutical companies.

SOURCE: Tamborlane WV et al. N Engl J Med. 2019 Apr 28. doi: 10.1056/NEJMoa1903822.

The addition of liraglutide to metformin shows significantly improved glycemic control in children and adolescents with type 2 diabetes, compared with metformin alone, according to data presented at the Pediatric Academic Societies annual meeting in Baltimore.

The phase 3 study, which was simultaneously published in the New England Journal of Medicine, involved 134 patients aged 10-17 years with type 2 diabetes who were managing their diabetes with diet and exercise, metformin, or insulin.

Participants were randomized either to subcutaneous liraglutide – dose-escalated up to 1.8 mg/day, depending on efficacy and side effects – or placebo for 52 weeks. The first 26 weeks were double blind and the second 26 weeks were an open-label extension period.

At 26 weeks, mean glycated hemoglobin levels in the liraglutide group had decreased by 0.64 percentage points from baseline, but in the placebo group they had increased by 0.42 percentage points, representing a treatment difference of –1.06 percentage points (P less than .001). By week 52, the treatment difference between the two groups had increased to –1.30 percentage points.

William V. Tamborlane, MD, from the department of pediatrics at Yale University, New Haven, Conn., and his coauthors wrote that metformin is the approved drug of choice for pediatric patients with type 2 diabetes, and that insulin currently is the only approved option for those who do not have an adequate response to metformin monotherapy.

“This discrepancy in available treatments for youth as compared with adults persists because of a lack of successfully completed trials needed for approval of new drugs for the treatment of type 2 diabetes in children since a trial of metformin was completed in 1999,” they wrote.

The study showed that significantly more patients in the liraglutide group (63.7%) achieved glycated hemoglobin levels below 7%, compared with 36.5% of patients in the placebo group. Fasting plasma glucose levels were decreased in the liraglutide group at both 26 and 52 weeks, but had increased in the placebo group.

Although the number of reported adverse events were similar between the two groups, there were significantly more reports of gastrointestinal adverse events – particularly nausea – in patients taking liraglutide, compared with those on placebo.

However, the study did not show a difference between liraglutide and placebo in lowering body mass index, although mean body weight decreases – which were seen in both groups – were maintained at week 52 only in the liraglutide group. The authors suggested this might be owing to the relatively small number of patients enrolled in the study and that some of the children were still growing.

Novo Nordisk, which manufactures liraglutide, supported the study. Twelve authors reported grants or support from Novo Nordisk in relation to the trial. Three authors were employees of Novo Nordisk. Eight authors reported unrelated grants and fees from Novo Nordisk and other pharmaceutical companies.

SOURCE: Tamborlane WV et al. N Engl J Med. 2019 Apr 28. doi: 10.1056/NEJMoa1903822.

The addition of liraglutide to metformin shows significantly improved glycemic control in children and adolescents with type 2 diabetes, compared with metformin alone, according to data presented at the Pediatric Academic Societies annual meeting in Baltimore.

The phase 3 study, which was simultaneously published in the New England Journal of Medicine, involved 134 patients aged 10-17 years with type 2 diabetes who were managing their diabetes with diet and exercise, metformin, or insulin.

Participants were randomized either to subcutaneous liraglutide – dose-escalated up to 1.8 mg/day, depending on efficacy and side effects – or placebo for 52 weeks. The first 26 weeks were double blind and the second 26 weeks were an open-label extension period.

At 26 weeks, mean glycated hemoglobin levels in the liraglutide group had decreased by 0.64 percentage points from baseline, but in the placebo group they had increased by 0.42 percentage points, representing a treatment difference of –1.06 percentage points (P less than .001). By week 52, the treatment difference between the two groups had increased to –1.30 percentage points.

William V. Tamborlane, MD, from the department of pediatrics at Yale University, New Haven, Conn., and his coauthors wrote that metformin is the approved drug of choice for pediatric patients with type 2 diabetes, and that insulin currently is the only approved option for those who do not have an adequate response to metformin monotherapy.

“This discrepancy in available treatments for youth as compared with adults persists because of a lack of successfully completed trials needed for approval of new drugs for the treatment of type 2 diabetes in children since a trial of metformin was completed in 1999,” they wrote.

The study showed that significantly more patients in the liraglutide group (63.7%) achieved glycated hemoglobin levels below 7%, compared with 36.5% of patients in the placebo group. Fasting plasma glucose levels were decreased in the liraglutide group at both 26 and 52 weeks, but had increased in the placebo group.

Although the number of reported adverse events were similar between the two groups, there were significantly more reports of gastrointestinal adverse events – particularly nausea – in patients taking liraglutide, compared with those on placebo.

However, the study did not show a difference between liraglutide and placebo in lowering body mass index, although mean body weight decreases – which were seen in both groups – were maintained at week 52 only in the liraglutide group. The authors suggested this might be owing to the relatively small number of patients enrolled in the study and that some of the children were still growing.

Novo Nordisk, which manufactures liraglutide, supported the study. Twelve authors reported grants or support from Novo Nordisk in relation to the trial. Three authors were employees of Novo Nordisk. Eight authors reported unrelated grants and fees from Novo Nordisk and other pharmaceutical companies.

SOURCE: Tamborlane WV et al. N Engl J Med. 2019 Apr 28. doi: 10.1056/NEJMoa1903822.

Thyroid cancer rates are on the rise in U.S. pediatric patients, a large epidemiologic study shows, and researchers say the trend can’t be explained away purely as overdiagnosis.

However, the extent of a real increase in clinically significant cancers and what might be causing that increase remains unclear, according to authors of the study and two related editorials appearing in the journal Cancer.

Cases of pediatric differentiated thyroid cancer (DTC) cases increased by 4.43% per year in the study, which was based on data from 39 U.S. cancer registries. Increases were seen in both smaller early-stage and larger late-stage tumors, leading study authors to assert that the trend was “unlikely to be explained solely by increased medical surveillance or improved detection.”

“Environmental and individual factors may also have affected rising trends,” said Meredith S. Shiels, PhD, of the National Cancer Institute and coauthors in a report on the study.

A true increase in pediatric thyroid cancer incidence is a possibility, authors of a related editorial said; however, they also expressed concern that inferences drawn from this U.S. cancer epidemiology data may be “artifactual.”

“We believe that first it is most important to closely examine the reasons for the increase that could be attributable to overdiagnosis, given this appears to be a likely explanation,” said authors of one editorial, including Amy Y. Chen, MD, MPH, of Emory University, Atlanta, and Louise Davies, MD, MS, of the Dartmouth Institute for Health Policy and Clinical Practice in Lebanon, N.H.

Overdiagnosis does occur, but the “real component” of the rise in thyroid cancer incidence cannot be ignored, according to a second editorial by David Goldenberg, MD, of Penn State University, Hershey.

“Although many authors are quick to explain the rise in thyroid cancer as an artifact of the overdiagnosis of clinically insignificant thyroid cancers, multiple groups all over the world have shown that this is not sufficient to explain the rise in thyroid cancer,” Dr. Goldenberg said in his editorial.
 

New data in pediatric patients

Pediatric DTCs are rare, representing just 2%-4% of pediatric malignancies, and they’re particularly rare in relation to adult cases, comprising about 2.3% of thyroid cancer diagnoses overall, according to Dr. Shiels and coauthors of the current study.

“The rarity of pediatric DTC, the lack of information on histologic features, or both have prevented prior studies from analyzing trends by tumor size or cancer stage at diagnosis,” they said.

To address this knowledge gap, Dr. Shiels and colleagues analyzed a total of 7,296 primary DTCs in children aged 0-19 years in data obtained from the North American Association of Central Cancer Registries. Ninety-one percent of these pediatric patients had papillary thyroid cancer, 83% were female, and 76% were between the ages of 15 to 19 years.

The rate of pediatric DTCs increased from 4.77 per million in 1998 to 8.82 per million in 2013, representing an increase of 4.43% per year, they found.

Both localized and more aggressive tumors increased in incidence over that time period, they also found. The annual increase was 4.06% for local stage at diagnosis, 5.68% for regional, and 8.55% for distant disease.

Similarly, increases were seen in small and large tumors alike. The annual percentage increase was 9.46% for tumors smaller than 1 cm, and 4.69% for tumors greater than 2 cm, according to the report.

Looking at age, investigators found that the increases in incidence were significant only for 10- to 19-year-olds, while significant increases were consistently observed for both sexes and for all races and ethnicities.
 

Overdiagnosis vs. environmental factors and lifestyle changes

If further investigations point to detection of subclinical disease as the cause of the increases in pediatric DTC incidence then initiatives may be needed to curtail use of CT scans, ultrasound, and needle biopsies, as has been done in adults, Dr. Chen and Dr. Davies said in their editorial.

“When the American Thyroid Association modified their guidelines for needle biopsy of nodules to discourage sampling of small lesions, a corresponding decrease in incidence rates was observed, suggesting that, indeed, overdiagnosis was the culprit,” they said.

Although it’s not clear what environmental factors or lifestyle changes are driving an increase, obesity has been consistently linked to increases in thyroid cancer, Dr. Goldenberg said. Conversely, smoking has been linked to reduced thyroid cancer risk, which means reduced prevalence of smoking in the community could potentially contribute to increased thyroid cancer incidence.

“It is our role as physicians to protect our patients from complacency and undertreatment,” he concluded in his editorial. “Explaining away thyroid cancers as being subclinical or clinically insignificant is reminiscent of days past when we told our patients: ‘Don’t worry, it’s good cancer.’ ”

The research by Dr. Shiels and colleagues was supported by the Intramural Research Program of the National Cancer Institute. Dr. Shiels and coauthors made no conflict of interest disclosures related to their report.

SOURCE: Shiels MO et al. Cancer. 2019 Apr 23. doi: 10.1002/cncr.32125.

Thyroid cancer rates are on the rise in U.S. pediatric patients, a large epidemiologic study shows, and researchers say the trend can’t be explained away purely as overdiagnosis.

However, the extent of a real increase in clinically significant cancers and what might be causing that increase remains unclear, according to authors of the study and two related editorials appearing in the journal Cancer.

Cases of pediatric differentiated thyroid cancer (DTC) cases increased by 4.43% per year in the study, which was based on data from 39 U.S. cancer registries. Increases were seen in both smaller early-stage and larger late-stage tumors, leading study authors to assert that the trend was “unlikely to be explained solely by increased medical surveillance or improved detection.”

“Environmental and individual factors may also have affected rising trends,” said Meredith S. Shiels, PhD, of the National Cancer Institute and coauthors in a report on the study.

A true increase in pediatric thyroid cancer incidence is a possibility, authors of a related editorial said; however, they also expressed concern that inferences drawn from this U.S. cancer epidemiology data may be “artifactual.”

“We believe that first it is most important to closely examine the reasons for the increase that could be attributable to overdiagnosis, given this appears to be a likely explanation,” said authors of one editorial, including Amy Y. Chen, MD, MPH, of Emory University, Atlanta, and Louise Davies, MD, MS, of the Dartmouth Institute for Health Policy and Clinical Practice in Lebanon, N.H.

Overdiagnosis does occur, but the “real component” of the rise in thyroid cancer incidence cannot be ignored, according to a second editorial by David Goldenberg, MD, of Penn State University, Hershey.

“Although many authors are quick to explain the rise in thyroid cancer as an artifact of the overdiagnosis of clinically insignificant thyroid cancers, multiple groups all over the world have shown that this is not sufficient to explain the rise in thyroid cancer,” Dr. Goldenberg said in his editorial.
 

New data in pediatric patients

Pediatric DTCs are rare, representing just 2%-4% of pediatric malignancies, and they’re particularly rare in relation to adult cases, comprising about 2.3% of thyroid cancer diagnoses overall, according to Dr. Shiels and coauthors of the current study.

“The rarity of pediatric DTC, the lack of information on histologic features, or both have prevented prior studies from analyzing trends by tumor size or cancer stage at diagnosis,” they said.

To address this knowledge gap, Dr. Shiels and colleagues analyzed a total of 7,296 primary DTCs in children aged 0-19 years in data obtained from the North American Association of Central Cancer Registries. Ninety-one percent of these pediatric patients had papillary thyroid cancer, 83% were female, and 76% were between the ages of 15 to 19 years.

The rate of pediatric DTCs increased from 4.77 per million in 1998 to 8.82 per million in 2013, representing an increase of 4.43% per year, they found.

Both localized and more aggressive tumors increased in incidence over that time period, they also found. The annual increase was 4.06% for local stage at diagnosis, 5.68% for regional, and 8.55% for distant disease.

Similarly, increases were seen in small and large tumors alike. The annual percentage increase was 9.46% for tumors smaller than 1 cm, and 4.69% for tumors greater than 2 cm, according to the report.

Looking at age, investigators found that the increases in incidence were significant only for 10- to 19-year-olds, while significant increases were consistently observed for both sexes and for all races and ethnicities.
 

Overdiagnosis vs. environmental factors and lifestyle changes

If further investigations point to detection of subclinical disease as the cause of the increases in pediatric DTC incidence then initiatives may be needed to curtail use of CT scans, ultrasound, and needle biopsies, as has been done in adults, Dr. Chen and Dr. Davies said in their editorial.

“When the American Thyroid Association modified their guidelines for needle biopsy of nodules to discourage sampling of small lesions, a corresponding decrease in incidence rates was observed, suggesting that, indeed, overdiagnosis was the culprit,” they said.

Although it’s not clear what environmental factors or lifestyle changes are driving an increase, obesity has been consistently linked to increases in thyroid cancer, Dr. Goldenberg said. Conversely, smoking has been linked to reduced thyroid cancer risk, which means reduced prevalence of smoking in the community could potentially contribute to increased thyroid cancer incidence.

“It is our role as physicians to protect our patients from complacency and undertreatment,” he concluded in his editorial. “Explaining away thyroid cancers as being subclinical or clinically insignificant is reminiscent of days past when we told our patients: ‘Don’t worry, it’s good cancer.’ ”

The research by Dr. Shiels and colleagues was supported by the Intramural Research Program of the National Cancer Institute. Dr. Shiels and coauthors made no conflict of interest disclosures related to their report.

SOURCE: Shiels MO et al. Cancer. 2019 Apr 23. doi: 10.1002/cncr.32125.

Thyroid cancer rates are on the rise in U.S. pediatric patients, a large epidemiologic study shows, and researchers say the trend can’t be explained away purely as overdiagnosis.

However, the extent of a real increase in clinically significant cancers and what might be causing that increase remains unclear, according to authors of the study and two related editorials appearing in the journal Cancer.

Cases of pediatric differentiated thyroid cancer (DTC) cases increased by 4.43% per year in the study, which was based on data from 39 U.S. cancer registries. Increases were seen in both smaller early-stage and larger late-stage tumors, leading study authors to assert that the trend was “unlikely to be explained solely by increased medical surveillance or improved detection.”

“Environmental and individual factors may also have affected rising trends,” said Meredith S. Shiels, PhD, of the National Cancer Institute and coauthors in a report on the study.

A true increase in pediatric thyroid cancer incidence is a possibility, authors of a related editorial said; however, they also expressed concern that inferences drawn from this U.S. cancer epidemiology data may be “artifactual.”

“We believe that first it is most important to closely examine the reasons for the increase that could be attributable to overdiagnosis, given this appears to be a likely explanation,” said authors of one editorial, including Amy Y. Chen, MD, MPH, of Emory University, Atlanta, and Louise Davies, MD, MS, of the Dartmouth Institute for Health Policy and Clinical Practice in Lebanon, N.H.

Overdiagnosis does occur, but the “real component” of the rise in thyroid cancer incidence cannot be ignored, according to a second editorial by David Goldenberg, MD, of Penn State University, Hershey.

“Although many authors are quick to explain the rise in thyroid cancer as an artifact of the overdiagnosis of clinically insignificant thyroid cancers, multiple groups all over the world have shown that this is not sufficient to explain the rise in thyroid cancer,” Dr. Goldenberg said in his editorial.
 

New data in pediatric patients

Pediatric DTCs are rare, representing just 2%-4% of pediatric malignancies, and they’re particularly rare in relation to adult cases, comprising about 2.3% of thyroid cancer diagnoses overall, according to Dr. Shiels and coauthors of the current study.

“The rarity of pediatric DTC, the lack of information on histologic features, or both have prevented prior studies from analyzing trends by tumor size or cancer stage at diagnosis,” they said.

To address this knowledge gap, Dr. Shiels and colleagues analyzed a total of 7,296 primary DTCs in children aged 0-19 years in data obtained from the North American Association of Central Cancer Registries. Ninety-one percent of these pediatric patients had papillary thyroid cancer, 83% were female, and 76% were between the ages of 15 to 19 years.

The rate of pediatric DTCs increased from 4.77 per million in 1998 to 8.82 per million in 2013, representing an increase of 4.43% per year, they found.

Both localized and more aggressive tumors increased in incidence over that time period, they also found. The annual increase was 4.06% for local stage at diagnosis, 5.68% for regional, and 8.55% for distant disease.

Similarly, increases were seen in small and large tumors alike. The annual percentage increase was 9.46% for tumors smaller than 1 cm, and 4.69% for tumors greater than 2 cm, according to the report.

Looking at age, investigators found that the increases in incidence were significant only for 10- to 19-year-olds, while significant increases were consistently observed for both sexes and for all races and ethnicities.
 

Overdiagnosis vs. environmental factors and lifestyle changes

If further investigations point to detection of subclinical disease as the cause of the increases in pediatric DTC incidence then initiatives may be needed to curtail use of CT scans, ultrasound, and needle biopsies, as has been done in adults, Dr. Chen and Dr. Davies said in their editorial.

“When the American Thyroid Association modified their guidelines for needle biopsy of nodules to discourage sampling of small lesions, a corresponding decrease in incidence rates was observed, suggesting that, indeed, overdiagnosis was the culprit,” they said.

Although it’s not clear what environmental factors or lifestyle changes are driving an increase, obesity has been consistently linked to increases in thyroid cancer, Dr. Goldenberg said. Conversely, smoking has been linked to reduced thyroid cancer risk, which means reduced prevalence of smoking in the community could potentially contribute to increased thyroid cancer incidence.

“It is our role as physicians to protect our patients from complacency and undertreatment,” he concluded in his editorial. “Explaining away thyroid cancers as being subclinical or clinically insignificant is reminiscent of days past when we told our patients: ‘Don’t worry, it’s good cancer.’ ”

The research by Dr. Shiels and colleagues was supported by the Intramural Research Program of the National Cancer Institute. Dr. Shiels and coauthors made no conflict of interest disclosures related to their report.

SOURCE: Shiels MO et al. Cancer. 2019 Apr 23. doi: 10.1002/cncr.32125.

Long-term use of alendronate and zoledronic acid for more than 3 years reduces the rate of vertebral fracture in treatment-naive postmenopausal women with notable, yet rare, adverse events, but too little evidence exists to make determinations on the long-term benefit/risk profile of other bisphosphonates or other osteoporosis drugs besides raloxifene and oral hormone therapy, according to a report coming out of a recent National Institutes of Health workshop.

This situation leaves a large research gap that authors of an accompanying position paper hope to bridge with recommendations for studying therapy discontinuation and drug holidays during long-term osteoporosis drug treatment.

The NIH’s Pathways to Prevention (P2P) Workshop: Appropriate Use of Drug Therapies for Osteoporotic Fracture Prevention outlined the findings of the systematic review of long-term osteoporosis drug treatment (ODT), which was commissioned by the NIH Office of Disease Prevention. The systematic review and a position paper summarizing the workshop were published April 23 in Annals of Internal Medicine.

“Clinicians and patients need increased information on benefits and risks to inform shared decision making about the use of these treatments, taking into account patients’ values and preferences,” Albert Siu, MD, of the Brookdale Department of Geriatrics and Palliative Medicine at the Icahn School of Medicine at Mount Sinai in New York, and his colleagues wrote in the position paper (Ann Intern Med. 2019 Apr 23. doi: 10.7326/M19-0961). “The research ... is urgently needed to advance prevention of osteoporosis-related mortality and morbidity.”

In the systematic review, by a group of researchers separate from the workshop, 48 studies were identified (35 trials, 13 observational studies) that compared men and postmenopausal women 50 years or older who used treatments such as alendronate, raloxifene, zoledronic acid, and hormone therapy. The researchers found that use of alendronate for 4 years reduced the rate of clinical fractures (hazard ratio, 0.64; 95% confidence interval, 0.50-0.82) and radiographic vertebral fractures (HR, 0.50; 95% CI, 0.31-0.82) in women with osteoporosis. Raloxifene use for 4 years reduced the rate of clinical vertebral fractures (relative risk, 0.58; 95% CI, 0.43-0.79) and radiographic vertebral fractures (RR, 0.64; 95% CI, 0.53-0.76) but not nonvertebral fractures. Zoledronic acid use for 6 years was associated with a lower rate of nonvertebral fractures (HR, 0.66; 95% CI, 0.51-0.85) and clinical vertebral fractures (HR, 0.41; 95% CI, 0.22-0.75) in women with both osteoporosis and osteopenia. Estrogen-progestin use for 5.6 years and unopposed estrogen for 7 years was associated with clinical fracture reduction in women with unspecified osteoporosis and osteopenia when compared with placebo (Ann Intern Med. 2019 April 23. doi: 10.7326/M19-0533).

Controlled observational studies collectively show that long-term use of alendronate and of bisphosphonates as a class increased risk for radiologically confirmed atypical femoral fracture but by a small absolute amount, with less evidence for risks of subtrochanteric or femoral shaft fractures without radiologically confirmed atypical femoral fracture features and osteonecrosis of the jaw. However, there were no eligible observational studies with long-term use of zoledronic acid that evaluated risk for these adverse events.

Long-term raloxifene therapy was associated with a threefold increased risk for deep venous thrombosis and a three- to fourfold increased risk for pulmonary embolism, although not all results were statistically significant, the researchers said. In two long-term trials, both estrogen and estrogen-progestin compared with placebo increased risk for cardiovascular disease and cognitive impairment. Estrogen-progestin also increased risk for invasive breast cancer.

The researchers also studied abaloparatide, denosumab, ibandronate, risedronate, and teriparatide, but noted there were insufficient data to show the long-term effects of their use on fractures and other harms.

Dr. Siu and coauthors on the position paper made the following recommendations with regard to future research on long-term ODT:

• Using “innovative designs and approaches” for new research such as modeling studies, clinical trials, and observational studies of existing and potential treatments.

• Evaluating new agents or multicomponent interventions, such as fracture liaison services and oral care, that do not carry the downsides of antiresorptive therapies.

• Researching and preventing atypical femoral fracture and osteonecrosis of the jaw, particularly when associated with long-term denosumab or bisphosphonate use.

• Determining which patients are indicated for drug holidays, sequential therapies, and strategies for avoiding serious adverse events.

• Studying barriers to ODT.

“When we have information on these outcomes, such as how medication use after a fragility fracture is linked to future fractures or survival rates, we need to understand how to convey that information to patients so they can make more informed decisions about their care,” noted Dr. Siu and colleagues.

In an editorial related to both the position paper and the systematic review, Carolyn J. Crandall, MD, of the University of California, Los Angeles, agreed that clinical trial data do not answer questions about shared decision making for women with multiple comorbid conditions, the long-term effects of ODT with regard to rare fracture risk, and which patients are well-suited for drug holidays.

“The National Institutes of Health should support research to answer these high-impact clinical questions, in addition to encouraging approaches for clinicians to determine which individual patients are at greater risk for harms related to long-term bisphosphonate use,” she said. “The need to rigorously study patient preferences in the context of ODT is pressing because of the complex dosing instructions of oral bisphosphonates and the dramatic underutilization of ODT among persons who have already had a vertebral or hip fracture.”

The systematic review was funded by the National Institutes of Health and the Agency for Healthcare Research and Quality. The authors of the position paper and Dr. Crandall reported no conflicts of interest.

SOURCE: Siu A et al. Ann Intern Med. 2019 April 23. doi: 10.7326/M19-0961.

Long-term use of alendronate and zoledronic acid for more than 3 years reduces the rate of vertebral fracture in treatment-naive postmenopausal women with notable, yet rare, adverse events, but too little evidence exists to make determinations on the long-term benefit/risk profile of other bisphosphonates or other osteoporosis drugs besides raloxifene and oral hormone therapy, according to a report coming out of a recent National Institutes of Health workshop.

This situation leaves a large research gap that authors of an accompanying position paper hope to bridge with recommendations for studying therapy discontinuation and drug holidays during long-term osteoporosis drug treatment.

The NIH’s Pathways to Prevention (P2P) Workshop: Appropriate Use of Drug Therapies for Osteoporotic Fracture Prevention outlined the findings of the systematic review of long-term osteoporosis drug treatment (ODT), which was commissioned by the NIH Office of Disease Prevention. The systematic review and a position paper summarizing the workshop were published April 23 in Annals of Internal Medicine.

“Clinicians and patients need increased information on benefits and risks to inform shared decision making about the use of these treatments, taking into account patients’ values and preferences,” Albert Siu, MD, of the Brookdale Department of Geriatrics and Palliative Medicine at the Icahn School of Medicine at Mount Sinai in New York, and his colleagues wrote in the position paper (Ann Intern Med. 2019 Apr 23. doi: 10.7326/M19-0961). “The research ... is urgently needed to advance prevention of osteoporosis-related mortality and morbidity.”

In the systematic review, by a group of researchers separate from the workshop, 48 studies were identified (35 trials, 13 observational studies) that compared men and postmenopausal women 50 years or older who used treatments such as alendronate, raloxifene, zoledronic acid, and hormone therapy. The researchers found that use of alendronate for 4 years reduced the rate of clinical fractures (hazard ratio, 0.64; 95% confidence interval, 0.50-0.82) and radiographic vertebral fractures (HR, 0.50; 95% CI, 0.31-0.82) in women with osteoporosis. Raloxifene use for 4 years reduced the rate of clinical vertebral fractures (relative risk, 0.58; 95% CI, 0.43-0.79) and radiographic vertebral fractures (RR, 0.64; 95% CI, 0.53-0.76) but not nonvertebral fractures. Zoledronic acid use for 6 years was associated with a lower rate of nonvertebral fractures (HR, 0.66; 95% CI, 0.51-0.85) and clinical vertebral fractures (HR, 0.41; 95% CI, 0.22-0.75) in women with both osteoporosis and osteopenia. Estrogen-progestin use for 5.6 years and unopposed estrogen for 7 years was associated with clinical fracture reduction in women with unspecified osteoporosis and osteopenia when compared with placebo (Ann Intern Med. 2019 April 23. doi: 10.7326/M19-0533).

Controlled observational studies collectively show that long-term use of alendronate and of bisphosphonates as a class increased risk for radiologically confirmed atypical femoral fracture but by a small absolute amount, with less evidence for risks of subtrochanteric or femoral shaft fractures without radiologically confirmed atypical femoral fracture features and osteonecrosis of the jaw. However, there were no eligible observational studies with long-term use of zoledronic acid that evaluated risk for these adverse events.

Long-term raloxifene therapy was associated with a threefold increased risk for deep venous thrombosis and a three- to fourfold increased risk for pulmonary embolism, although not all results were statistically significant, the researchers said. In two long-term trials, both estrogen and estrogen-progestin compared with placebo increased risk for cardiovascular disease and cognitive impairment. Estrogen-progestin also increased risk for invasive breast cancer.

The researchers also studied abaloparatide, denosumab, ibandronate, risedronate, and teriparatide, but noted there were insufficient data to show the long-term effects of their use on fractures and other harms.

Dr. Siu and coauthors on the position paper made the following recommendations with regard to future research on long-term ODT:

• Using “innovative designs and approaches” for new research such as modeling studies, clinical trials, and observational studies of existing and potential treatments.

• Evaluating new agents or multicomponent interventions, such as fracture liaison services and oral care, that do not carry the downsides of antiresorptive therapies.

• Researching and preventing atypical femoral fracture and osteonecrosis of the jaw, particularly when associated with long-term denosumab or bisphosphonate use.

• Determining which patients are indicated for drug holidays, sequential therapies, and strategies for avoiding serious adverse events.

• Studying barriers to ODT.

“When we have information on these outcomes, such as how medication use after a fragility fracture is linked to future fractures or survival rates, we need to understand how to convey that information to patients so they can make more informed decisions about their care,” noted Dr. Siu and colleagues.

In an editorial related to both the position paper and the systematic review, Carolyn J. Crandall, MD, of the University of California, Los Angeles, agreed that clinical trial data do not answer questions about shared decision making for women with multiple comorbid conditions, the long-term effects of ODT with regard to rare fracture risk, and which patients are well-suited for drug holidays.

“The National Institutes of Health should support research to answer these high-impact clinical questions, in addition to encouraging approaches for clinicians to determine which individual patients are at greater risk for harms related to long-term bisphosphonate use,” she said. “The need to rigorously study patient preferences in the context of ODT is pressing because of the complex dosing instructions of oral bisphosphonates and the dramatic underutilization of ODT among persons who have already had a vertebral or hip fracture.”

The systematic review was funded by the National Institutes of Health and the Agency for Healthcare Research and Quality. The authors of the position paper and Dr. Crandall reported no conflicts of interest.

SOURCE: Siu A et al. Ann Intern Med. 2019 April 23. doi: 10.7326/M19-0961.

Long-term use of alendronate and zoledronic acid for more than 3 years reduces the rate of vertebral fracture in treatment-naive postmenopausal women with notable, yet rare, adverse events, but too little evidence exists to make determinations on the long-term benefit/risk profile of other bisphosphonates or other osteoporosis drugs besides raloxifene and oral hormone therapy, according to a report coming out of a recent National Institutes of Health workshop.

This situation leaves a large research gap that authors of an accompanying position paper hope to bridge with recommendations for studying therapy discontinuation and drug holidays during long-term osteoporosis drug treatment.

The NIH’s Pathways to Prevention (P2P) Workshop: Appropriate Use of Drug Therapies for Osteoporotic Fracture Prevention outlined the findings of the systematic review of long-term osteoporosis drug treatment (ODT), which was commissioned by the NIH Office of Disease Prevention. The systematic review and a position paper summarizing the workshop were published April 23 in Annals of Internal Medicine.

“Clinicians and patients need increased information on benefits and risks to inform shared decision making about the use of these treatments, taking into account patients’ values and preferences,” Albert Siu, MD, of the Brookdale Department of Geriatrics and Palliative Medicine at the Icahn School of Medicine at Mount Sinai in New York, and his colleagues wrote in the position paper (Ann Intern Med. 2019 Apr 23. doi: 10.7326/M19-0961). “The research ... is urgently needed to advance prevention of osteoporosis-related mortality and morbidity.”

In the systematic review, by a group of researchers separate from the workshop, 48 studies were identified (35 trials, 13 observational studies) that compared men and postmenopausal women 50 years or older who used treatments such as alendronate, raloxifene, zoledronic acid, and hormone therapy. The researchers found that use of alendronate for 4 years reduced the rate of clinical fractures (hazard ratio, 0.64; 95% confidence interval, 0.50-0.82) and radiographic vertebral fractures (HR, 0.50; 95% CI, 0.31-0.82) in women with osteoporosis. Raloxifene use for 4 years reduced the rate of clinical vertebral fractures (relative risk, 0.58; 95% CI, 0.43-0.79) and radiographic vertebral fractures (RR, 0.64; 95% CI, 0.53-0.76) but not nonvertebral fractures. Zoledronic acid use for 6 years was associated with a lower rate of nonvertebral fractures (HR, 0.66; 95% CI, 0.51-0.85) and clinical vertebral fractures (HR, 0.41; 95% CI, 0.22-0.75) in women with both osteoporosis and osteopenia. Estrogen-progestin use for 5.6 years and unopposed estrogen for 7 years was associated with clinical fracture reduction in women with unspecified osteoporosis and osteopenia when compared with placebo (Ann Intern Med. 2019 April 23. doi: 10.7326/M19-0533).

Controlled observational studies collectively show that long-term use of alendronate and of bisphosphonates as a class increased risk for radiologically confirmed atypical femoral fracture but by a small absolute amount, with less evidence for risks of subtrochanteric or femoral shaft fractures without radiologically confirmed atypical femoral fracture features and osteonecrosis of the jaw. However, there were no eligible observational studies with long-term use of zoledronic acid that evaluated risk for these adverse events.

Long-term raloxifene therapy was associated with a threefold increased risk for deep venous thrombosis and a three- to fourfold increased risk for pulmonary embolism, although not all results were statistically significant, the researchers said. In two long-term trials, both estrogen and estrogen-progestin compared with placebo increased risk for cardiovascular disease and cognitive impairment. Estrogen-progestin also increased risk for invasive breast cancer.

The researchers also studied abaloparatide, denosumab, ibandronate, risedronate, and teriparatide, but noted there were insufficient data to show the long-term effects of their use on fractures and other harms.

Dr. Siu and coauthors on the position paper made the following recommendations with regard to future research on long-term ODT:

• Using “innovative designs and approaches” for new research such as modeling studies, clinical trials, and observational studies of existing and potential treatments.

• Evaluating new agents or multicomponent interventions, such as fracture liaison services and oral care, that do not carry the downsides of antiresorptive therapies.

• Researching and preventing atypical femoral fracture and osteonecrosis of the jaw, particularly when associated with long-term denosumab or bisphosphonate use.

• Determining which patients are indicated for drug holidays, sequential therapies, and strategies for avoiding serious adverse events.

• Studying barriers to ODT.

“When we have information on these outcomes, such as how medication use after a fragility fracture is linked to future fractures or survival rates, we need to understand how to convey that information to patients so they can make more informed decisions about their care,” noted Dr. Siu and colleagues.

In an editorial related to both the position paper and the systematic review, Carolyn J. Crandall, MD, of the University of California, Los Angeles, agreed that clinical trial data do not answer questions about shared decision making for women with multiple comorbid conditions, the long-term effects of ODT with regard to rare fracture risk, and which patients are well-suited for drug holidays.

“The National Institutes of Health should support research to answer these high-impact clinical questions, in addition to encouraging approaches for clinicians to determine which individual patients are at greater risk for harms related to long-term bisphosphonate use,” she said. “The need to rigorously study patient preferences in the context of ODT is pressing because of the complex dosing instructions of oral bisphosphonates and the dramatic underutilization of ODT among persons who have already had a vertebral or hip fracture.”

The systematic review was funded by the National Institutes of Health and the Agency for Healthcare Research and Quality. The authors of the position paper and Dr. Crandall reported no conflicts of interest.

SOURCE: Siu A et al. Ann Intern Med. 2019 April 23. doi: 10.7326/M19-0961.

A 48-year-old man presents to his primary care physician because of progressively decreasing energy and gradual decline in both libido and erectile function for the past 18 months. He has noticed decreased morning erections as well. He rates his libido at 3 to 4 on a scale of 10 for the past 6 months. He also reports poor motivation, depressed mood, impaired concentration, and sleep disturbances. He reports no hair loss, headache, or dizziness, and no decrease in shaving frequency. Review of his systems is otherwise unremarkable.

He has had dyslipidemia for 3 years and is not known to have hypertension or diabetes. His medications include atorvastatin, vitamin E, and multivitamins.

He is married with 3 children and does not wish to have more. He works as a software engineer and leads a sedentary lifestyle. He is a nonsmoker and occasionally drinks alcohol on the weekends.

On physical examination, he is alert and oriented and appears well. His height is 5 feet 10 inches (178 cm), weight 230 lb (104 kg), and body mass index (BMI) 32.8 kg/m². His blood pressure is 115/83 mm Hg and pulse rate is 82 beats per minute and regular. Findings on cardiovascular and pulmonary examination are normal. He has large fatty breasts but without palpable glandular tissue.

Genitourinary examination reveals normal hair distribution, a normal-sized penis, and slightly soft testes with testicular volume of 18–20 mL bilaterally.

His primary care physician suspects that he has low testosterone and orders some basic laboratory tests; the results are normal except for a low total testosterone level (Table 1).

FURTHER TESTING

1. Which of the following tests should his physician order next?

• Repeat total testosterone measurement
• Free testosterone measurement by commercial assay
• Calculated free testosterone
• Bioavailable testosterone measurement
• Serum inhibin B measurement

This patient presents with several nonspecific symptoms. But collectively they suggest testosterone deficiency (hypogonadism).

Together, erectile dysfunction, low libido, and decreased morning erections strongly suggest hypogonadism.² Loss of body hair and decreased shaving frequency are specific symptoms of hypogonadism; however, they require years to develop.³ Gynecomastia can also occur due to loss of the inhibitory action of testosterone on breast growth and a relative increase in estradiol. This occurs more in primary hypogonadism, due to the increase in luteinizing hormone (LH), which stimulates the remaining Leydig cells to secrete estradiol rather than testosterone.⁴

To diagnose hypogonadism in men and to start treatment for it, current guidelines recommend that the patient should have clinical features as well as laboratory evidence of low testosterone.^5,6

Measuring testosterone: Total, free, bound, and bioavailable

Testosterone, a steroid hormone, circulates in the serum either as free testosterone or bound to several plasma proteins, mainly sex-hormone binding globulin (SHBG) and albumin.

Total testosterone includes both the free and bound fractions, whereas bioavailable testosterone includes both free and the portion bound to albumin, which has low affinity and can dissociate and be used at the tissue level.¹¹

Low levels of total testosterone do not necessarily reflect a hypogonadal state, as a man with altered SHBG levels or binding capabilities can have low total but normal free testosterone levels and no manifestations.¹² Several conditions can alter the levels of SHBG, including obesity, diabetes, aging, thyroid dysfunction, and others.^5,13

Because our patient is obese, his total testosterone level is not a reliable indicator of hypogonadism, and repeating its measurement will not add diagnostic value.

Therefore, an alternative measurement should be used to accurately reflect the testosterone levels. From a physiologic point of view, bioavailable testosterone is the active form of testosterone and is the most accurate to be measured in a patient with hypogonadism. Nevertheless, because of technical difficulties in its measurement and lack of evidence correlating bioavailable testosterone with the clinical picture of hypogonadism, it is recommended that the level of free testosterone be used.⁵

The gold standard for direct measurement of serum free testosterone is equilibrium dialysis, but this is expensive and time-consuming.¹⁴ Commercial assays for free testosterone exist but have been deemed unreliable.^14,15 It is recommended that free testosterone be measured by equilibrium dialysis or calculated using equations based on total testosterone, SHBG, and albumin levels.⁵ These equations are reliable and give results very close to the values obtained by equilibrium dialysis.¹⁵ Therefore, in our patient, it would be suitable to calculate the free testosterone level next.

Serum levels of free testosterone vary according to several factors. Diurnal variation of testosterone has been established: levels are highest in the morning and decline throughout the day.¹⁶ Food decreases testosterone levels.¹⁷ In addition, there is considerable day-to-day variation.¹8 Therefore, at least 2 readings of fasting morning testosterone on 2 separate days are recommended for the diagnosis of hypogonadism.⁵

Inhibin B is a hormone produced by Sertoli cells in the testes in response to follicle-stimulating hormone (FSH) stimulation. In turn, it acts as negative feedback, together with testosterone, to inhibit FSH release from the pituitary. Inhibin B has been shown to reflect spermatogenesis in the testes and therefore fertility.¹⁹ Inhibin B levels were found to be low in patients with central hypogonadism, due to less FSH release; however, they did not correlate with testosterone levels.²⁰

The patient’s physician orders morning fasting total testosterone, SHBG, and albumin testing and calculates the free testosterone level, which yields a value of 3 ng/dL (reference range 4.5–17). This is confirmed by a repeat measurement, which yields a value of 2.9 ng/dL. Laboratory test results combined with his clinical presentation are consistent with hypogonadism.

2. What is the most appropriate next step?

• Measurement of serum LH and FSH
• Measurement of serum prolactin
• Scrotal ultrasonography
• Gonadotropin-releasing hormone (GnRH) stimulation test
• Semen analysis

After hypogonadism is diagnosed, it is important to distinguish if it is primary or central. This is achieved by measuring serum LH and FSH.⁵ All biotin supplements should be stopped at least 72 hours before measuring LH and FSH, as biotin can interfere with the assays, yielding false values.²¹

Secretion of FSH and LH from the anterior pituitary is under the influence of pulsatile release of GnRH from the hypothalamus. LH acts on Leydig cells in the testes to produce testosterone, whereas FSH acts on Sertoli cells, together with testosterone, to bring about spermatogenesis in the seminiferous tubules. Testosterone acts centrally as negative feedback to decrease the release of LH and FSH.

Primary hypogonadism occurs due to testicular failure, ie, the testes themselves fail to produce testosterone, leading to hypogonadism. The decrease in testosterone levels, together with inhibin B if Sertoli cells are damaged, lead to loss of negative feedback on the hypothalamus and pituitary, and therefore increased levels of LH and FSH. This is termed hypergonadotropic hypogonadism. Testicular failure may also result in impaired spermatogenesis and infertility due to destruction of testicular structures, in which case fertility cannot be restored.

Central hypogonadism occurs when the pituitary fails to produce LH and FSH (secondary hypogonadism) or when the hypothalamus fails to produce GnRH and subsequently the lack of secretion of LH and FSH from the pituitary (tertiary hypogonadism). The lack of LH will result in no stimulation of Leydig cells to produce testosterone, and therefore its deficiency. Serum hormone levels in central hypogonadism will reveal low testosterone, with either low or inappropriately normal gonadotropins (LH and FSH). This is termed hypogonadotropic hypogonadism. The lack of FSH, together with testosterone deficiency will also result in decreased spermatogenesis and therefore infertility. Testicular structures are preserved, however, and fertility can be restored with appropriate therapy, as discussed below.

Prolactin should be measured only if the patient has central hypogonadism. Its measurement is not warranted at this point in the patient’s workup. The implications of prolactin and its relationship to hypogonadism will be discussed later.

Although, this stepwise approach is not convenient for many patients, some physicians follow it because it is cost-effective, especially in those who are not insured. However, other physicians order FSH, LH, and sometimes prolactin with the confirmatory low testosterone measurement. Laboratories can also be instructed to wait to measure the pituitary hormones and to do so only if low testosterone is confirmed.

Varicocele, a possible cause of male infertility, can also impair Leydig cell function and cause low testosterone. In fact, surgical repair of varicocele has been demonstrated to increase serum testosterone.²² Scrotal ultrasonography is used to diagnose varicocele, but this also should be ordered at a later stage in the workup if primary hypogonadism is diagnosed.

The GnRH stimulation test is important for the diagnosis and evaluation of precocious or delayed puberty in children. In boys with delayed puberty, a poorer response to GnRH stimulation indicates central hypogonadism rather than constitutional delay.²³ It has no role in the evaluation of postpubertal or adult-onset hypogonadism.

Semen analysis is important to evaluate fertility if the patient is interested in further procreation.⁵ Low testosterone levels may result in impaired spermatogenesis and therefore infertility. On the other hand, treatment with exogenous testosterone will also result in infertility, by feedback inhibition of LH and FSH and therefore inhibition of spermatogenesis. If the patient wishes to preserve fertility, treatment options other than testosterone should be considered; examples include clomiphene citrate, human menopausal gonadotropin, and human chorionic gonadotropin.^23,24

Our patient has no desire to expand his family; therefore, a semen analysis and attempts to preserve spermatogenesis are not indicated.

His physician orders testing of serum LH and FSH, yielding the following values:

• LH 1.6 mIU/mL (reference range 1.8–12)
• FSH 1.9 mIU/mL (reference range 1.5–12.5).

The diagnosis of central hypogonadism is established.

3. Which investigation is the least appropriate in the further evaluation of this patient?

• 
  Serum free thyroxine (T₄) and morning cortisol measurement
• Serum prolactin measurement
• Serum ferritin measurement
• Pituitary magnetic resonance imaging (MRI)
• Chromosomal karyotyping

The diagnosis of central hypogonadism warrants evaluation for possible causes. These are summarized in Table 4.

Serum free thyroxine and morning cortisol

Since this patient’s LH and FSH values are abnormal, it is important to evaluate the status of other anterior pituitary hormones. In patients with pituitary abnormalities, serum free T₄ is a more reliable test for assessing thyroid function than thyroid-stimulating hormone (TSH), because of loss of the negative feedback of thyroid hormones on the diseased pituitary. In contrast, serum TSH is considered the best single thyroid test to assess primary thyroid dysfunction.

Other measurements include prolactin and morning cortisol (reflecting adrenocorticotropic hormone status).

Prolactin measurement

Prolactin measurement is important to evaluate for hyperprolactinemia, as this will lead to hypogonadism by inhibition of GnRH secretion.²⁵ Different pathologic, pharmacologic, and physiologic conditions can result in hyperprolactinemia, including prolactinomas, other pituitary and hypothalamic lesions, primary hypothyroidism, and medications such as antipsychotics.²⁵ Dopamine agonists are the mainstay treatment for hyperprolactinemia.

Ferritin measurement

Ferritin measurement is indicated to diagnose iron overload conditions such as hemochromatosis, which can result in primary hypogonadism via testicular damage or in secondary hypogonadism via pituitary damage.²⁶

Pituitary MRI with contrast

Pituitary MRI with contrast is used to diagnose structural lesions of the pituitary or hypothalamus. This diagnostic modality is indicated for patients with pituitary dysfunction, including central hypogonadism, manifestations of a mass effect (headache, visual field defects), persistent hyperprolactinemia, and panhypopituitarism, among others. To improve the diagnostic yield of pituitary MRI, the Endocrine Society guidelines recommend it for men with serum total testosterone levels below 150 ng/dL.⁵ However, some clinicians have a lower threshold for ordering pituitary MRI for patients with central hypogonadism. Physician judgment and expertise should be exercised and the decision made on an individual basis.

Chromosomal karyotyping

Chromosomal karyotyping is not indicated in our patient. It is reserved for those with primary hypogonadism to diagnose Klinefelter syndrome, which has a karyotype of 47,XXY.

CASE RESUMED: MOSH SYNDROME

Our patient’s prolactin, free T₄, morning cortisol, and ferritin levels are measured, yielding normal values. No abnormalities are seen on pituitary MRI. A clinical reevaluation is conducted, revealing no history of head trauma or head and neck radiation. The lack of an obvious cause in our patient’s clinical presentation and workup, together with his obesity (BMI 32.8 kg/m²) supports the diagnosis of obesity as the cause of his hypogonadism.

Obesity can be a cause of secondary hypogonadism, which has led to the term “MOSH” (male obesity-associated secondary hypogonadism) syndrome. In fact, a cross-sectional study has demonstrated that 40% of nondiabetic obese (BMI ≥ 30 kg/m²) men over age 45 have low serum free testosterone levels, compared with 26% for lean (BMI < 25 kg/m²) men.²⁷ Moreover, obesity has been found to be a strong predictor of testosterone replacement therapy.²⁸ Other studies have also found an inverse relationship between BMI and testosterone levels.²⁹

Several mechanisms interact in the pathogenesis of MOSH syndrome. Adipose tissue possesses aromatase activity, which converts androgens into estrogens.³⁰ Peripheral estrogen production can in turn exert feedback inhibition on pituitary gonadotropin secretion.³¹ In obese men, increased adipose tissue leads to increased aromatase activity and more estrogen, so more feedback inhibition on the pituitary and subsequently secondary hypogonadism. 


Leptin, a hormone produced by adipocytes, is also increased in obesity, and was found to be inversely correlated with serum testosterone.³² Studies have demonstrated that leptin has an inhibitory effect on the enzymatic pathway that synthesizes testosterone in Leydig cells.³³

Proinflammatory cytokines have also been implicated, as central obesity is associated with an increase in these cytokines, which in turn act negatively on the hypothalamus and impair GnRH release leading to lower testosterone.^34,35

Treating obesity-related hypogonadism

In a pilot study,³⁶ lifestyle attempts to reduce obesity were shown to improve hormonal levels. Bariatric surgery has also been demonstrated to be successful.³⁷

Clomiphene citrate, a selective estrogen receptor modulator, increases endogenous testosterone secretion by inhibiting the negative feedback of estrogen on the hypothalamus and pituitary and thus increasing LH and FSH. It also preserves endogenous testosterone production, since it does not suppress the hypothalamic-pituitary-testicular axis.³⁸ This made clomiphene citrate a potential treatment for men with central hypogonadism including those with MOSH.³⁹

Nevertheless, there are no randomized trials to prove its safety and efficacy in the management of central hypogonadism.⁵ Regarding its use in men wishing to preserve fertility, most studies did not show improvement. However, a meta-analysis demonstrated statistically significant increased pregnancy rates in partners of men with idiopathic infertility if the men used 50 mg of clomiphene citrate daily.⁴⁰

Testosterone deficiency can be a marker of metabolic syndrome, which needs to be managed more urgently than hypogonadism. A cross-sectional study found not only an association between metabolic syndrome and low serum testosterone, but also with each individual component of metabolic syndrome on its own, all of which need to be addressed.¹⁰

The physician counsels the patient regarding the implications, potential adverse outcomes, and available treatments for his obesity, including lifestyle modification and bariatric surgery. The patient declines surgery and wishes to adopt a weight-reducing diet and exercise program, for which he is referred to a dietitian.

In addition, in view of the patient’s clinically and biochemically proven hypogonadism, his physician offers testosterone replacement therapy. He orders a serum prostate-specific antigen (PSA) level, which is 1.3 ng/dL (reference range < 4 ng/dL). The patient is prescribed 5 g of 1% testosterone gel daily.

TESTOSTERONE REPLACEMENT THERAPY

4. Which is the most common adverse effect of testosterone replacement therapy?

• Cardiovascular events
• Erythrocytosis
• Prostate cancer
• Infertility
• Obstructive sleep apnea

Clinicians should be very cautious in initiating testosterone replacement therapy in any patient with an unstable medical condition.

There are several formulations of testosterone replacement therapy, including intramuscular injections, transdermal gels or patches, buccal tablets, an intranasal gel, and oral tablets. Of note, there are 2 different forms of oral testosterone preparations: testosterone undecanoate and 17-alpha alkylated testosterone. The former is unavailable in the United States and the latter is not recommended for use due to its proven hepatic toxicity.⁴¹

Testosterone and erythrocytosis

Meta-analyses have concluded that the most frequent adverse event of testosterone replacement therapy is a significant rise in hematocrit.⁴² This rise was found to be dose-dependent and was more marked in older men.⁴³ Although all preparations can cause erythrocytosis, parenteral forms have been observed to raise it the most, particularly short-term injectables.^44,45

The mechanism behind this increase is attributed to increased erythropoietin levels and improved usage of iron for red blood cell synthesis.⁴⁶ In fact, testosterone replacement therapy has been shown to improve hemoglobin levels in patients with anemia.⁴⁷ On the other hand, increasing hematocrit levels may lead to thrombotic and vasoocclusive events.⁴⁴

Testosterone and prostate cancer

The relationship between testosterone treatment and prostate cancer has long been studied. Historically, testosterone replacement therapy was believed to increase the risk of prostate cancer; however, recent studies and meta-analyses have shown that this is not the case.^42,48 Nevertheless, clinical guidelines still recommend prostate monitoring for men on testosterone replacement therapy.^5,6

Testosterone and cardiovascular risk

The evidence regarding this issue has been contradictory and inconsistent. Meta-analyses have demonstrated that low testosterone is associated with higher risk of major adverse cardiovascular events.⁵⁰ These studies argue for the use of testosterone replacement therapy in hypogonadal men to decrease the risk. However, other studies and meta-analyses have found that testosterone replacement therapy is associated with increased cardiovascular risk and have concluded that major adverse cardiac events are in fact a risk of testosterone replacement therapy.⁵¹

Current recommendations advocate against the use of testosterone replacement therapy in men with uncontrolled heart failure or with cardiovascular events in the past 3 to 6 months.^5,6 Cardiovascular risk factors should be addressed and corrected, and patients should be educated on cardiovascular symptoms and the need to report them if they occur.

Testosterone and infertility

As described earlier, testosterone replacement therapy increases negative feedback on the pituitary and decreases LH and FSH production, leading to less spermatogenesis. Other treatment options should be sought for hypogonadal men wishing to preserve fertility.

Other adverse effects

Other adverse effects of testosterone replacement therapy include acne, oily skin, obstructive sleep apnea, gynecomastia, and balding.

Given all the adverse events that can be associated with testosterone replacement therapy, the risks and benefits of treating hypogonadism in each patient should be taken into consideration, and an individualized approach is required.

The patient presents 3 months later for follow-up. He reports significant improvement in his presenting symptoms including energy, libido, and erectile function. He also reports some improvement in his mood and concentration. He has lost 12 lb (5.4 kg) and is still trying to improve his diet and exercise program. He is compliant with his testosterone gel therapy.

His serum calculated free testosterone level is 7.8 ng/dL (4.5–17), and his hematocrit is 46%. The patient is instructed to continue his treatment and to return after 9 months for further follow-up.

TAKE-HOME POINTS

• Men with hypogonadism usually present with nonspecific manifestations, so clinicians should keep a high index of suspicion.
• Both clinical and biochemical evidence of hypogonadism should be present to diagnose and start treatment for it.
• Low levels of serum total testosterone do not necessarily reflect hypogonadism.
• The hormonal profile of central hypogonadism reveals low serum testosterone with low or inappropriately normal serum LH and FSH levels.

Obesity can cause central hypogonadism and should be suspected after pituitary and other systemic causes are excluded.

A 48-year-old man presents to his primary care physician because of progressively decreasing energy and gradual decline in both libido and erectile function for the past 18 months. He has noticed decreased morning erections as well. He rates his libido at 3 to 4 on a scale of 10 for the past 6 months. He also reports poor motivation, depressed mood, impaired concentration, and sleep disturbances. He reports no hair loss, headache, or dizziness, and no decrease in shaving frequency. Review of his systems is otherwise unremarkable.

He has had dyslipidemia for 3 years and is not known to have hypertension or diabetes. His medications include atorvastatin, vitamin E, and multivitamins.

He is married with 3 children and does not wish to have more. He works as a software engineer and leads a sedentary lifestyle. He is a nonsmoker and occasionally drinks alcohol on the weekends.

On physical examination, he is alert and oriented and appears well. His height is 5 feet 10 inches (178 cm), weight 230 lb (104 kg), and body mass index (BMI) 32.8 kg/m². His blood pressure is 115/83 mm Hg and pulse rate is 82 beats per minute and regular. Findings on cardiovascular and pulmonary examination are normal. He has large fatty breasts but without palpable glandular tissue.

Genitourinary examination reveals normal hair distribution, a normal-sized penis, and slightly soft testes with testicular volume of 18–20 mL bilaterally.

His primary care physician suspects that he has low testosterone and orders some basic laboratory tests; the results are normal except for a low total testosterone level (Table 1).

FURTHER TESTING

1. Which of the following tests should his physician order next?

• Repeat total testosterone measurement
• Free testosterone measurement by commercial assay
• Calculated free testosterone
• Bioavailable testosterone measurement
• Serum inhibin B measurement

This patient presents with several nonspecific symptoms. But collectively they suggest testosterone deficiency (hypogonadism).

Together, erectile dysfunction, low libido, and decreased morning erections strongly suggest hypogonadism.² Loss of body hair and decreased shaving frequency are specific symptoms of hypogonadism; however, they require years to develop.³ Gynecomastia can also occur due to loss of the inhibitory action of testosterone on breast growth and a relative increase in estradiol. This occurs more in primary hypogonadism, due to the increase in luteinizing hormone (LH), which stimulates the remaining Leydig cells to secrete estradiol rather than testosterone.⁴

To diagnose hypogonadism in men and to start treatment for it, current guidelines recommend that the patient should have clinical features as well as laboratory evidence of low testosterone.^5,6

Measuring testosterone: Total, free, bound, and bioavailable

Testosterone, a steroid hormone, circulates in the serum either as free testosterone or bound to several plasma proteins, mainly sex-hormone binding globulin (SHBG) and albumin.

Total testosterone includes both the free and bound fractions, whereas bioavailable testosterone includes both free and the portion bound to albumin, which has low affinity and can dissociate and be used at the tissue level.¹¹

Low levels of total testosterone do not necessarily reflect a hypogonadal state, as a man with altered SHBG levels or binding capabilities can have low total but normal free testosterone levels and no manifestations.¹² Several conditions can alter the levels of SHBG, including obesity, diabetes, aging, thyroid dysfunction, and others.^5,13

Because our patient is obese, his total testosterone level is not a reliable indicator of hypogonadism, and repeating its measurement will not add diagnostic value.

Therefore, an alternative measurement should be used to accurately reflect the testosterone levels. From a physiologic point of view, bioavailable testosterone is the active form of testosterone and is the most accurate to be measured in a patient with hypogonadism. Nevertheless, because of technical difficulties in its measurement and lack of evidence correlating bioavailable testosterone with the clinical picture of hypogonadism, it is recommended that the level of free testosterone be used.⁵

The gold standard for direct measurement of serum free testosterone is equilibrium dialysis, but this is expensive and time-consuming.¹⁴ Commercial assays for free testosterone exist but have been deemed unreliable.^14,15 It is recommended that free testosterone be measured by equilibrium dialysis or calculated using equations based on total testosterone, SHBG, and albumin levels.⁵ These equations are reliable and give results very close to the values obtained by equilibrium dialysis.¹⁵ Therefore, in our patient, it would be suitable to calculate the free testosterone level next.

Serum levels of free testosterone vary according to several factors. Diurnal variation of testosterone has been established: levels are highest in the morning and decline throughout the day.¹⁶ Food decreases testosterone levels.¹⁷ In addition, there is considerable day-to-day variation.¹8 Therefore, at least 2 readings of fasting morning testosterone on 2 separate days are recommended for the diagnosis of hypogonadism.⁵

Inhibin B is a hormone produced by Sertoli cells in the testes in response to follicle-stimulating hormone (FSH) stimulation. In turn, it acts as negative feedback, together with testosterone, to inhibit FSH release from the pituitary. Inhibin B has been shown to reflect spermatogenesis in the testes and therefore fertility.¹⁹ Inhibin B levels were found to be low in patients with central hypogonadism, due to less FSH release; however, they did not correlate with testosterone levels.²⁰

The patient’s physician orders morning fasting total testosterone, SHBG, and albumin testing and calculates the free testosterone level, which yields a value of 3 ng/dL (reference range 4.5–17). This is confirmed by a repeat measurement, which yields a value of 2.9 ng/dL. Laboratory test results combined with his clinical presentation are consistent with hypogonadism.

2. What is the most appropriate next step?

• Measurement of serum LH and FSH
• Measurement of serum prolactin
• Scrotal ultrasonography
• Gonadotropin-releasing hormone (GnRH) stimulation test
• Semen analysis

After hypogonadism is diagnosed, it is important to distinguish if it is primary or central. This is achieved by measuring serum LH and FSH.⁵ All biotin supplements should be stopped at least 72 hours before measuring LH and FSH, as biotin can interfere with the assays, yielding false values.²¹

Secretion of FSH and LH from the anterior pituitary is under the influence of pulsatile release of GnRH from the hypothalamus. LH acts on Leydig cells in the testes to produce testosterone, whereas FSH acts on Sertoli cells, together with testosterone, to bring about spermatogenesis in the seminiferous tubules. Testosterone acts centrally as negative feedback to decrease the release of LH and FSH.

Primary hypogonadism occurs due to testicular failure, ie, the testes themselves fail to produce testosterone, leading to hypogonadism. The decrease in testosterone levels, together with inhibin B if Sertoli cells are damaged, lead to loss of negative feedback on the hypothalamus and pituitary, and therefore increased levels of LH and FSH. This is termed hypergonadotropic hypogonadism. Testicular failure may also result in impaired spermatogenesis and infertility due to destruction of testicular structures, in which case fertility cannot be restored.

Central hypogonadism occurs when the pituitary fails to produce LH and FSH (secondary hypogonadism) or when the hypothalamus fails to produce GnRH and subsequently the lack of secretion of LH and FSH from the pituitary (tertiary hypogonadism). The lack of LH will result in no stimulation of Leydig cells to produce testosterone, and therefore its deficiency. Serum hormone levels in central hypogonadism will reveal low testosterone, with either low or inappropriately normal gonadotropins (LH and FSH). This is termed hypogonadotropic hypogonadism. The lack of FSH, together with testosterone deficiency will also result in decreased spermatogenesis and therefore infertility. Testicular structures are preserved, however, and fertility can be restored with appropriate therapy, as discussed below.

Prolactin should be measured only if the patient has central hypogonadism. Its measurement is not warranted at this point in the patient’s workup. The implications of prolactin and its relationship to hypogonadism will be discussed later.

Although, this stepwise approach is not convenient for many patients, some physicians follow it because it is cost-effective, especially in those who are not insured. However, other physicians order FSH, LH, and sometimes prolactin with the confirmatory low testosterone measurement. Laboratories can also be instructed to wait to measure the pituitary hormones and to do so only if low testosterone is confirmed.

Varicocele, a possible cause of male infertility, can also impair Leydig cell function and cause low testosterone. In fact, surgical repair of varicocele has been demonstrated to increase serum testosterone.²² Scrotal ultrasonography is used to diagnose varicocele, but this also should be ordered at a later stage in the workup if primary hypogonadism is diagnosed.

The GnRH stimulation test is important for the diagnosis and evaluation of precocious or delayed puberty in children. In boys with delayed puberty, a poorer response to GnRH stimulation indicates central hypogonadism rather than constitutional delay.²³ It has no role in the evaluation of postpubertal or adult-onset hypogonadism.

Semen analysis is important to evaluate fertility if the patient is interested in further procreation.⁵ Low testosterone levels may result in impaired spermatogenesis and therefore infertility. On the other hand, treatment with exogenous testosterone will also result in infertility, by feedback inhibition of LH and FSH and therefore inhibition of spermatogenesis. If the patient wishes to preserve fertility, treatment options other than testosterone should be considered; examples include clomiphene citrate, human menopausal gonadotropin, and human chorionic gonadotropin.^23,24

Our patient has no desire to expand his family; therefore, a semen analysis and attempts to preserve spermatogenesis are not indicated.

His physician orders testing of serum LH and FSH, yielding the following values:

• LH 1.6 mIU/mL (reference range 1.8–12)
• FSH 1.9 mIU/mL (reference range 1.5–12.5).

The diagnosis of central hypogonadism is established.

3. Which investigation is the least appropriate in the further evaluation of this patient?

• 
  Serum free thyroxine (T₄) and morning cortisol measurement
• Serum prolactin measurement
• Serum ferritin measurement
• Pituitary magnetic resonance imaging (MRI)
• Chromosomal karyotyping

The diagnosis of central hypogonadism warrants evaluation for possible causes. These are summarized in Table 4.

Serum free thyroxine and morning cortisol

Since this patient’s LH and FSH values are abnormal, it is important to evaluate the status of other anterior pituitary hormones. In patients with pituitary abnormalities, serum free T₄ is a more reliable test for assessing thyroid function than thyroid-stimulating hormone (TSH), because of loss of the negative feedback of thyroid hormones on the diseased pituitary. In contrast, serum TSH is considered the best single thyroid test to assess primary thyroid dysfunction.

Other measurements include prolactin and morning cortisol (reflecting adrenocorticotropic hormone status).

Prolactin measurement

Prolactin measurement is important to evaluate for hyperprolactinemia, as this will lead to hypogonadism by inhibition of GnRH secretion.²⁵ Different pathologic, pharmacologic, and physiologic conditions can result in hyperprolactinemia, including prolactinomas, other pituitary and hypothalamic lesions, primary hypothyroidism, and medications such as antipsychotics.²⁵ Dopamine agonists are the mainstay treatment for hyperprolactinemia.

Ferritin measurement

Ferritin measurement is indicated to diagnose iron overload conditions such as hemochromatosis, which can result in primary hypogonadism via testicular damage or in secondary hypogonadism via pituitary damage.²⁶

Pituitary MRI with contrast

Pituitary MRI with contrast is used to diagnose structural lesions of the pituitary or hypothalamus. This diagnostic modality is indicated for patients with pituitary dysfunction, including central hypogonadism, manifestations of a mass effect (headache, visual field defects), persistent hyperprolactinemia, and panhypopituitarism, among others. To improve the diagnostic yield of pituitary MRI, the Endocrine Society guidelines recommend it for men with serum total testosterone levels below 150 ng/dL.⁵ However, some clinicians have a lower threshold for ordering pituitary MRI for patients with central hypogonadism. Physician judgment and expertise should be exercised and the decision made on an individual basis.

Chromosomal karyotyping

Chromosomal karyotyping is not indicated in our patient. It is reserved for those with primary hypogonadism to diagnose Klinefelter syndrome, which has a karyotype of 47,XXY.

CASE RESUMED: MOSH SYNDROME

Our patient’s prolactin, free T₄, morning cortisol, and ferritin levels are measured, yielding normal values. No abnormalities are seen on pituitary MRI. A clinical reevaluation is conducted, revealing no history of head trauma or head and neck radiation. The lack of an obvious cause in our patient’s clinical presentation and workup, together with his obesity (BMI 32.8 kg/m²) supports the diagnosis of obesity as the cause of his hypogonadism.

Obesity can be a cause of secondary hypogonadism, which has led to the term “MOSH” (male obesity-associated secondary hypogonadism) syndrome. In fact, a cross-sectional study has demonstrated that 40% of nondiabetic obese (BMI ≥ 30 kg/m²) men over age 45 have low serum free testosterone levels, compared with 26% for lean (BMI < 25 kg/m²) men.²⁷ Moreover, obesity has been found to be a strong predictor of testosterone replacement therapy.²⁸ Other studies have also found an inverse relationship between BMI and testosterone levels.²⁹

Several mechanisms interact in the pathogenesis of MOSH syndrome. Adipose tissue possesses aromatase activity, which converts androgens into estrogens.³⁰ Peripheral estrogen production can in turn exert feedback inhibition on pituitary gonadotropin secretion.³¹ In obese men, increased adipose tissue leads to increased aromatase activity and more estrogen, so more feedback inhibition on the pituitary and subsequently secondary hypogonadism. 


Leptin, a hormone produced by adipocytes, is also increased in obesity, and was found to be inversely correlated with serum testosterone.³² Studies have demonstrated that leptin has an inhibitory effect on the enzymatic pathway that synthesizes testosterone in Leydig cells.³³

Proinflammatory cytokines have also been implicated, as central obesity is associated with an increase in these cytokines, which in turn act negatively on the hypothalamus and impair GnRH release leading to lower testosterone.^34,35

Treating obesity-related hypogonadism

In a pilot study,³⁶ lifestyle attempts to reduce obesity were shown to improve hormonal levels. Bariatric surgery has also been demonstrated to be successful.³⁷

Clomiphene citrate, a selective estrogen receptor modulator, increases endogenous testosterone secretion by inhibiting the negative feedback of estrogen on the hypothalamus and pituitary and thus increasing LH and FSH. It also preserves endogenous testosterone production, since it does not suppress the hypothalamic-pituitary-testicular axis.³⁸ This made clomiphene citrate a potential treatment for men with central hypogonadism including those with MOSH.³⁹

Nevertheless, there are no randomized trials to prove its safety and efficacy in the management of central hypogonadism.⁵ Regarding its use in men wishing to preserve fertility, most studies did not show improvement. However, a meta-analysis demonstrated statistically significant increased pregnancy rates in partners of men with idiopathic infertility if the men used 50 mg of clomiphene citrate daily.⁴⁰

Testosterone deficiency can be a marker of metabolic syndrome, which needs to be managed more urgently than hypogonadism. A cross-sectional study found not only an association between metabolic syndrome and low serum testosterone, but also with each individual component of metabolic syndrome on its own, all of which need to be addressed.¹⁰

The physician counsels the patient regarding the implications, potential adverse outcomes, and available treatments for his obesity, including lifestyle modification and bariatric surgery. The patient declines surgery and wishes to adopt a weight-reducing diet and exercise program, for which he is referred to a dietitian.

In addition, in view of the patient’s clinically and biochemically proven hypogonadism, his physician offers testosterone replacement therapy. He orders a serum prostate-specific antigen (PSA) level, which is 1.3 ng/dL (reference range < 4 ng/dL). The patient is prescribed 5 g of 1% testosterone gel daily.

TESTOSTERONE REPLACEMENT THERAPY

4. Which is the most common adverse effect of testosterone replacement therapy?

• Cardiovascular events
• Erythrocytosis
• Prostate cancer
• Infertility
• Obstructive sleep apnea

Clinicians should be very cautious in initiating testosterone replacement therapy in any patient with an unstable medical condition.

There are several formulations of testosterone replacement therapy, including intramuscular injections, transdermal gels or patches, buccal tablets, an intranasal gel, and oral tablets. Of note, there are 2 different forms of oral testosterone preparations: testosterone undecanoate and 17-alpha alkylated testosterone. The former is unavailable in the United States and the latter is not recommended for use due to its proven hepatic toxicity.⁴¹

Testosterone and erythrocytosis

Meta-analyses have concluded that the most frequent adverse event of testosterone replacement therapy is a significant rise in hematocrit.⁴² This rise was found to be dose-dependent and was more marked in older men.⁴³ Although all preparations can cause erythrocytosis, parenteral forms have been observed to raise it the most, particularly short-term injectables.^44,45

The mechanism behind this increase is attributed to increased erythropoietin levels and improved usage of iron for red blood cell synthesis.⁴⁶ In fact, testosterone replacement therapy has been shown to improve hemoglobin levels in patients with anemia.⁴⁷ On the other hand, increasing hematocrit levels may lead to thrombotic and vasoocclusive events.⁴⁴

Testosterone and prostate cancer

The relationship between testosterone treatment and prostate cancer has long been studied. Historically, testosterone replacement therapy was believed to increase the risk of prostate cancer; however, recent studies and meta-analyses have shown that this is not the case.^42,48 Nevertheless, clinical guidelines still recommend prostate monitoring for men on testosterone replacement therapy.^5,6

Testosterone and cardiovascular risk

The evidence regarding this issue has been contradictory and inconsistent. Meta-analyses have demonstrated that low testosterone is associated with higher risk of major adverse cardiovascular events.⁵⁰ These studies argue for the use of testosterone replacement therapy in hypogonadal men to decrease the risk. However, other studies and meta-analyses have found that testosterone replacement therapy is associated with increased cardiovascular risk and have concluded that major adverse cardiac events are in fact a risk of testosterone replacement therapy.⁵¹

Current recommendations advocate against the use of testosterone replacement therapy in men with uncontrolled heart failure or with cardiovascular events in the past 3 to 6 months.^5,6 Cardiovascular risk factors should be addressed and corrected, and patients should be educated on cardiovascular symptoms and the need to report them if they occur.

Testosterone and infertility

As described earlier, testosterone replacement therapy increases negative feedback on the pituitary and decreases LH and FSH production, leading to less spermatogenesis. Other treatment options should be sought for hypogonadal men wishing to preserve fertility.

Other adverse effects

Other adverse effects of testosterone replacement therapy include acne, oily skin, obstructive sleep apnea, gynecomastia, and balding.

Given all the adverse events that can be associated with testosterone replacement therapy, the risks and benefits of treating hypogonadism in each patient should be taken into consideration, and an individualized approach is required.

The patient presents 3 months later for follow-up. He reports significant improvement in his presenting symptoms including energy, libido, and erectile function. He also reports some improvement in his mood and concentration. He has lost 12 lb (5.4 kg) and is still trying to improve his diet and exercise program. He is compliant with his testosterone gel therapy.

His serum calculated free testosterone level is 7.8 ng/dL (4.5–17), and his hematocrit is 46%. The patient is instructed to continue his treatment and to return after 9 months for further follow-up.

TAKE-HOME POINTS

• Men with hypogonadism usually present with nonspecific manifestations, so clinicians should keep a high index of suspicion.
• Both clinical and biochemical evidence of hypogonadism should be present to diagnose and start treatment for it.
• Low levels of serum total testosterone do not necessarily reflect hypogonadism.
• The hormonal profile of central hypogonadism reveals low serum testosterone with low or inappropriately normal serum LH and FSH levels.

Obesity can cause central hypogonadism and should be suspected after pituitary and other systemic causes are excluded.

A 48-year-old man presents to his primary care physician because of progressively decreasing energy and gradual decline in both libido and erectile function for the past 18 months. He has noticed decreased morning erections as well. He rates his libido at 3 to 4 on a scale of 10 for the past 6 months. He also reports poor motivation, depressed mood, impaired concentration, and sleep disturbances. He reports no hair loss, headache, or dizziness, and no decrease in shaving frequency. Review of his systems is otherwise unremarkable.

He has had dyslipidemia for 3 years and is not known to have hypertension or diabetes. His medications include atorvastatin, vitamin E, and multivitamins.

He is married with 3 children and does not wish to have more. He works as a software engineer and leads a sedentary lifestyle. He is a nonsmoker and occasionally drinks alcohol on the weekends.

On physical examination, he is alert and oriented and appears well. His height is 5 feet 10 inches (178 cm), weight 230 lb (104 kg), and body mass index (BMI) 32.8 kg/m². His blood pressure is 115/83 mm Hg and pulse rate is 82 beats per minute and regular. Findings on cardiovascular and pulmonary examination are normal. He has large fatty breasts but without palpable glandular tissue.

Genitourinary examination reveals normal hair distribution, a normal-sized penis, and slightly soft testes with testicular volume of 18–20 mL bilaterally.

His primary care physician suspects that he has low testosterone and orders some basic laboratory tests; the results are normal except for a low total testosterone level (Table 1).

FURTHER TESTING

1. Which of the following tests should his physician order next?

• Repeat total testosterone measurement
• Free testosterone measurement by commercial assay
• Calculated free testosterone
• Bioavailable testosterone measurement
• Serum inhibin B measurement

This patient presents with several nonspecific symptoms. But collectively they suggest testosterone deficiency (hypogonadism).

Together, erectile dysfunction, low libido, and decreased morning erections strongly suggest hypogonadism.² Loss of body hair and decreased shaving frequency are specific symptoms of hypogonadism; however, they require years to develop.³ Gynecomastia can also occur due to loss of the inhibitory action of testosterone on breast growth and a relative increase in estradiol. This occurs more in primary hypogonadism, due to the increase in luteinizing hormone (LH), which stimulates the remaining Leydig cells to secrete estradiol rather than testosterone.⁴

To diagnose hypogonadism in men and to start treatment for it, current guidelines recommend that the patient should have clinical features as well as laboratory evidence of low testosterone.^5,6

Measuring testosterone: Total, free, bound, and bioavailable

Testosterone, a steroid hormone, circulates in the serum either as free testosterone or bound to several plasma proteins, mainly sex-hormone binding globulin (SHBG) and albumin.

Total testosterone includes both the free and bound fractions, whereas bioavailable testosterone includes both free and the portion bound to albumin, which has low affinity and can dissociate and be used at the tissue level.¹¹

Low levels of total testosterone do not necessarily reflect a hypogonadal state, as a man with altered SHBG levels or binding capabilities can have low total but normal free testosterone levels and no manifestations.¹² Several conditions can alter the levels of SHBG, including obesity, diabetes, aging, thyroid dysfunction, and others.^5,13

Because our patient is obese, his total testosterone level is not a reliable indicator of hypogonadism, and repeating its measurement will not add diagnostic value.

Therefore, an alternative measurement should be used to accurately reflect the testosterone levels. From a physiologic point of view, bioavailable testosterone is the active form of testosterone and is the most accurate to be measured in a patient with hypogonadism. Nevertheless, because of technical difficulties in its measurement and lack of evidence correlating bioavailable testosterone with the clinical picture of hypogonadism, it is recommended that the level of free testosterone be used.⁵

The gold standard for direct measurement of serum free testosterone is equilibrium dialysis, but this is expensive and time-consuming.¹⁴ Commercial assays for free testosterone exist but have been deemed unreliable.^14,15 It is recommended that free testosterone be measured by equilibrium dialysis or calculated using equations based on total testosterone, SHBG, and albumin levels.⁵ These equations are reliable and give results very close to the values obtained by equilibrium dialysis.¹⁵ Therefore, in our patient, it would be suitable to calculate the free testosterone level next.

Serum levels of free testosterone vary according to several factors. Diurnal variation of testosterone has been established: levels are highest in the morning and decline throughout the day.¹⁶ Food decreases testosterone levels.¹⁷ In addition, there is considerable day-to-day variation.¹8 Therefore, at least 2 readings of fasting morning testosterone on 2 separate days are recommended for the diagnosis of hypogonadism.⁵

Inhibin B is a hormone produced by Sertoli cells in the testes in response to follicle-stimulating hormone (FSH) stimulation. In turn, it acts as negative feedback, together with testosterone, to inhibit FSH release from the pituitary. Inhibin B has been shown to reflect spermatogenesis in the testes and therefore fertility.¹⁹ Inhibin B levels were found to be low in patients with central hypogonadism, due to less FSH release; however, they did not correlate with testosterone levels.²⁰

The patient’s physician orders morning fasting total testosterone, SHBG, and albumin testing and calculates the free testosterone level, which yields a value of 3 ng/dL (reference range 4.5–17). This is confirmed by a repeat measurement, which yields a value of 2.9 ng/dL. Laboratory test results combined with his clinical presentation are consistent with hypogonadism.

2. What is the most appropriate next step?

• Measurement of serum LH and FSH
• Measurement of serum prolactin
• Scrotal ultrasonography
• Gonadotropin-releasing hormone (GnRH) stimulation test
• Semen analysis

After hypogonadism is diagnosed, it is important to distinguish if it is primary or central. This is achieved by measuring serum LH and FSH.⁵ All biotin supplements should be stopped at least 72 hours before measuring LH and FSH, as biotin can interfere with the assays, yielding false values.²¹

Secretion of FSH and LH from the anterior pituitary is under the influence of pulsatile release of GnRH from the hypothalamus. LH acts on Leydig cells in the testes to produce testosterone, whereas FSH acts on Sertoli cells, together with testosterone, to bring about spermatogenesis in the seminiferous tubules. Testosterone acts centrally as negative feedback to decrease the release of LH and FSH.

Primary hypogonadism occurs due to testicular failure, ie, the testes themselves fail to produce testosterone, leading to hypogonadism. The decrease in testosterone levels, together with inhibin B if Sertoli cells are damaged, lead to loss of negative feedback on the hypothalamus and pituitary, and therefore increased levels of LH and FSH. This is termed hypergonadotropic hypogonadism. Testicular failure may also result in impaired spermatogenesis and infertility due to destruction of testicular structures, in which case fertility cannot be restored.

Central hypogonadism occurs when the pituitary fails to produce LH and FSH (secondary hypogonadism) or when the hypothalamus fails to produce GnRH and subsequently the lack of secretion of LH and FSH from the pituitary (tertiary hypogonadism). The lack of LH will result in no stimulation of Leydig cells to produce testosterone, and therefore its deficiency. Serum hormone levels in central hypogonadism will reveal low testosterone, with either low or inappropriately normal gonadotropins (LH and FSH). This is termed hypogonadotropic hypogonadism. The lack of FSH, together with testosterone deficiency will also result in decreased spermatogenesis and therefore infertility. Testicular structures are preserved, however, and fertility can be restored with appropriate therapy, as discussed below.

Prolactin should be measured only if the patient has central hypogonadism. Its measurement is not warranted at this point in the patient’s workup. The implications of prolactin and its relationship to hypogonadism will be discussed later.

Although, this stepwise approach is not convenient for many patients, some physicians follow it because it is cost-effective, especially in those who are not insured. However, other physicians order FSH, LH, and sometimes prolactin with the confirmatory low testosterone measurement. Laboratories can also be instructed to wait to measure the pituitary hormones and to do so only if low testosterone is confirmed.

Varicocele, a possible cause of male infertility, can also impair Leydig cell function and cause low testosterone. In fact, surgical repair of varicocele has been demonstrated to increase serum testosterone.²² Scrotal ultrasonography is used to diagnose varicocele, but this also should be ordered at a later stage in the workup if primary hypogonadism is diagnosed.

The GnRH stimulation test is important for the diagnosis and evaluation of precocious or delayed puberty in children. In boys with delayed puberty, a poorer response to GnRH stimulation indicates central hypogonadism rather than constitutional delay.²³ It has no role in the evaluation of postpubertal or adult-onset hypogonadism.

Semen analysis is important to evaluate fertility if the patient is interested in further procreation.⁵ Low testosterone levels may result in impaired spermatogenesis and therefore infertility. On the other hand, treatment with exogenous testosterone will also result in infertility, by feedback inhibition of LH and FSH and therefore inhibition of spermatogenesis. If the patient wishes to preserve fertility, treatment options other than testosterone should be considered; examples include clomiphene citrate, human menopausal gonadotropin, and human chorionic gonadotropin.^23,24

Our patient has no desire to expand his family; therefore, a semen analysis and attempts to preserve spermatogenesis are not indicated.

His physician orders testing of serum LH and FSH, yielding the following values:

• LH 1.6 mIU/mL (reference range 1.8–12)
• FSH 1.9 mIU/mL (reference range 1.5–12.5).

The diagnosis of central hypogonadism is established.

3. Which investigation is the least appropriate in the further evaluation of this patient?

• 
  Serum free thyroxine (T₄) and morning cortisol measurement
• Serum prolactin measurement
• Serum ferritin measurement
• Pituitary magnetic resonance imaging (MRI)
• Chromosomal karyotyping

The diagnosis of central hypogonadism warrants evaluation for possible causes. These are summarized in Table 4.

Serum free thyroxine and morning cortisol

Since this patient’s LH and FSH values are abnormal, it is important to evaluate the status of other anterior pituitary hormones. In patients with pituitary abnormalities, serum free T₄ is a more reliable test for assessing thyroid function than thyroid-stimulating hormone (TSH), because of loss of the negative feedback of thyroid hormones on the diseased pituitary. In contrast, serum TSH is considered the best single thyroid test to assess primary thyroid dysfunction.

Other measurements include prolactin and morning cortisol (reflecting adrenocorticotropic hormone status).

Prolactin measurement

Prolactin measurement is important to evaluate for hyperprolactinemia, as this will lead to hypogonadism by inhibition of GnRH secretion.²⁵ Different pathologic, pharmacologic, and physiologic conditions can result in hyperprolactinemia, including prolactinomas, other pituitary and hypothalamic lesions, primary hypothyroidism, and medications such as antipsychotics.²⁵ Dopamine agonists are the mainstay treatment for hyperprolactinemia.

Ferritin measurement

Ferritin measurement is indicated to diagnose iron overload conditions such as hemochromatosis, which can result in primary hypogonadism via testicular damage or in secondary hypogonadism via pituitary damage.²⁶

Pituitary MRI with contrast

Pituitary MRI with contrast is used to diagnose structural lesions of the pituitary or hypothalamus. This diagnostic modality is indicated for patients with pituitary dysfunction, including central hypogonadism, manifestations of a mass effect (headache, visual field defects), persistent hyperprolactinemia, and panhypopituitarism, among others. To improve the diagnostic yield of pituitary MRI, the Endocrine Society guidelines recommend it for men with serum total testosterone levels below 150 ng/dL.⁵ However, some clinicians have a lower threshold for ordering pituitary MRI for patients with central hypogonadism. Physician judgment and expertise should be exercised and the decision made on an individual basis.

Chromosomal karyotyping

Chromosomal karyotyping is not indicated in our patient. It is reserved for those with primary hypogonadism to diagnose Klinefelter syndrome, which has a karyotype of 47,XXY.

CASE RESUMED: MOSH SYNDROME

Our patient’s prolactin, free T₄, morning cortisol, and ferritin levels are measured, yielding normal values. No abnormalities are seen on pituitary MRI. A clinical reevaluation is conducted, revealing no history of head trauma or head and neck radiation. The lack of an obvious cause in our patient’s clinical presentation and workup, together with his obesity (BMI 32.8 kg/m²) supports the diagnosis of obesity as the cause of his hypogonadism.

Obesity can be a cause of secondary hypogonadism, which has led to the term “MOSH” (male obesity-associated secondary hypogonadism) syndrome. In fact, a cross-sectional study has demonstrated that 40% of nondiabetic obese (BMI ≥ 30 kg/m²) men over age 45 have low serum free testosterone levels, compared with 26% for lean (BMI < 25 kg/m²) men.²⁷ Moreover, obesity has been found to be a strong predictor of testosterone replacement therapy.²⁸ Other studies have also found an inverse relationship between BMI and testosterone levels.²⁹

Several mechanisms interact in the pathogenesis of MOSH syndrome. Adipose tissue possesses aromatase activity, which converts androgens into estrogens.³⁰ Peripheral estrogen production can in turn exert feedback inhibition on pituitary gonadotropin secretion.³¹ In obese men, increased adipose tissue leads to increased aromatase activity and more estrogen, so more feedback inhibition on the pituitary and subsequently secondary hypogonadism. 


Leptin, a hormone produced by adipocytes, is also increased in obesity, and was found to be inversely correlated with serum testosterone.³² Studies have demonstrated that leptin has an inhibitory effect on the enzymatic pathway that synthesizes testosterone in Leydig cells.³³

Proinflammatory cytokines have also been implicated, as central obesity is associated with an increase in these cytokines, which in turn act negatively on the hypothalamus and impair GnRH release leading to lower testosterone.^34,35

Treating obesity-related hypogonadism

In a pilot study,³⁶ lifestyle attempts to reduce obesity were shown to improve hormonal levels. Bariatric surgery has also been demonstrated to be successful.³⁷

Clomiphene citrate, a selective estrogen receptor modulator, increases endogenous testosterone secretion by inhibiting the negative feedback of estrogen on the hypothalamus and pituitary and thus increasing LH and FSH. It also preserves endogenous testosterone production, since it does not suppress the hypothalamic-pituitary-testicular axis.³⁸ This made clomiphene citrate a potential treatment for men with central hypogonadism including those with MOSH.³⁹

Nevertheless, there are no randomized trials to prove its safety and efficacy in the management of central hypogonadism.⁵ Regarding its use in men wishing to preserve fertility, most studies did not show improvement. However, a meta-analysis demonstrated statistically significant increased pregnancy rates in partners of men with idiopathic infertility if the men used 50 mg of clomiphene citrate daily.⁴⁰

Testosterone deficiency can be a marker of metabolic syndrome, which needs to be managed more urgently than hypogonadism. A cross-sectional study found not only an association between metabolic syndrome and low serum testosterone, but also with each individual component of metabolic syndrome on its own, all of which need to be addressed.¹⁰

The physician counsels the patient regarding the implications, potential adverse outcomes, and available treatments for his obesity, including lifestyle modification and bariatric surgery. The patient declines surgery and wishes to adopt a weight-reducing diet and exercise program, for which he is referred to a dietitian.

In addition, in view of the patient’s clinically and biochemically proven hypogonadism, his physician offers testosterone replacement therapy. He orders a serum prostate-specific antigen (PSA) level, which is 1.3 ng/dL (reference range < 4 ng/dL). The patient is prescribed 5 g of 1% testosterone gel daily.

TESTOSTERONE REPLACEMENT THERAPY

4. Which is the most common adverse effect of testosterone replacement therapy?

• Cardiovascular events
• Erythrocytosis
• Prostate cancer
• Infertility
• Obstructive sleep apnea

Clinicians should be very cautious in initiating testosterone replacement therapy in any patient with an unstable medical condition.

There are several formulations of testosterone replacement therapy, including intramuscular injections, transdermal gels or patches, buccal tablets, an intranasal gel, and oral tablets. Of note, there are 2 different forms of oral testosterone preparations: testosterone undecanoate and 17-alpha alkylated testosterone. The former is unavailable in the United States and the latter is not recommended for use due to its proven hepatic toxicity.⁴¹

Testosterone and erythrocytosis

Meta-analyses have concluded that the most frequent adverse event of testosterone replacement therapy is a significant rise in hematocrit.⁴² This rise was found to be dose-dependent and was more marked in older men.⁴³ Although all preparations can cause erythrocytosis, parenteral forms have been observed to raise it the most, particularly short-term injectables.^44,45

The mechanism behind this increase is attributed to increased erythropoietin levels and improved usage of iron for red blood cell synthesis.⁴⁶ In fact, testosterone replacement therapy has been shown to improve hemoglobin levels in patients with anemia.⁴⁷ On the other hand, increasing hematocrit levels may lead to thrombotic and vasoocclusive events.⁴⁴

Testosterone and prostate cancer

The relationship between testosterone treatment and prostate cancer has long been studied. Historically, testosterone replacement therapy was believed to increase the risk of prostate cancer; however, recent studies and meta-analyses have shown that this is not the case.^42,48 Nevertheless, clinical guidelines still recommend prostate monitoring for men on testosterone replacement therapy.^5,6

Testosterone and cardiovascular risk

The evidence regarding this issue has been contradictory and inconsistent. Meta-analyses have demonstrated that low testosterone is associated with higher risk of major adverse cardiovascular events.⁵⁰ These studies argue for the use of testosterone replacement therapy in hypogonadal men to decrease the risk. However, other studies and meta-analyses have found that testosterone replacement therapy is associated with increased cardiovascular risk and have concluded that major adverse cardiac events are in fact a risk of testosterone replacement therapy.⁵¹

Current recommendations advocate against the use of testosterone replacement therapy in men with uncontrolled heart failure or with cardiovascular events in the past 3 to 6 months.^5,6 Cardiovascular risk factors should be addressed and corrected, and patients should be educated on cardiovascular symptoms and the need to report them if they occur.

Testosterone and infertility

As described earlier, testosterone replacement therapy increases negative feedback on the pituitary and decreases LH and FSH production, leading to less spermatogenesis. Other treatment options should be sought for hypogonadal men wishing to preserve fertility.

Other adverse effects

Other adverse effects of testosterone replacement therapy include acne, oily skin, obstructive sleep apnea, gynecomastia, and balding.

Given all the adverse events that can be associated with testosterone replacement therapy, the risks and benefits of treating hypogonadism in each patient should be taken into consideration, and an individualized approach is required.

The patient presents 3 months later for follow-up. He reports significant improvement in his presenting symptoms including energy, libido, and erectile function. He also reports some improvement in his mood and concentration. He has lost 12 lb (5.4 kg) and is still trying to improve his diet and exercise program. He is compliant with his testosterone gel therapy.

His serum calculated free testosterone level is 7.8 ng/dL (4.5–17), and his hematocrit is 46%. The patient is instructed to continue his treatment and to return after 9 months for further follow-up.

TAKE-HOME POINTS

• Men with hypogonadism usually present with nonspecific manifestations, so clinicians should keep a high index of suspicion.
• Both clinical and biochemical evidence of hypogonadism should be present to diagnose and start treatment for it.
• Low levels of serum total testosterone do not necessarily reflect hypogonadism.
• The hormonal profile of central hypogonadism reveals low serum testosterone with low or inappropriately normal serum LH and FSH levels.

Obesity can cause central hypogonadism and should be suspected after pituitary and other systemic causes are excluded.

Here are 5 articles from the May issue of Clinician Reviews (individual articles are valid for one year from date of publication—expiration dates below):

1. Subclinical hypothyroidism boosts immediate risk of heart failure

To take the posttest, go to: https://bit.ly/2IK0YiL
Expires January 24, 2020

2. Meta-analysis supports aspirin to reduce cardiovascular events

To take the posttest, go to: https://bit.ly/2GJLgSB
Expires January 24, 2020

3. Age of migraine onset may affect stroke risk

To take the posttest, go to: https://bit.ly/2ZAJ5YR
Expires January 24, 2020

4. Women with RA have reduced chance of live birth after assisted reproduction treatment

To take the posttest, go to: https://bit.ly/2VvKRLF
Expires January 27, 2020

5. New SLE disease activity measure beats SLEDAI-2K

To take the posttest, go to: https://bit.ly/2W8SVPA
Expires January 31, 2020

Here are 5 articles from the May issue of Clinician Reviews (individual articles are valid for one year from date of publication—expiration dates below):

1. Subclinical hypothyroidism boosts immediate risk of heart failure

To take the posttest, go to: https://bit.ly/2IK0YiL
Expires January 24, 2020

2. Meta-analysis supports aspirin to reduce cardiovascular events

To take the posttest, go to: https://bit.ly/2GJLgSB
Expires January 24, 2020

3. Age of migraine onset may affect stroke risk

To take the posttest, go to: https://bit.ly/2ZAJ5YR
Expires January 24, 2020

4. Women with RA have reduced chance of live birth after assisted reproduction treatment

To take the posttest, go to: https://bit.ly/2VvKRLF
Expires January 27, 2020

5. New SLE disease activity measure beats SLEDAI-2K

To take the posttest, go to: https://bit.ly/2W8SVPA
Expires January 31, 2020

Here are 5 articles from the May issue of Clinician Reviews (individual articles are valid for one year from date of publication—expiration dates below):

1. Subclinical hypothyroidism boosts immediate risk of heart failure

To take the posttest, go to: https://bit.ly/2IK0YiL
Expires January 24, 2020

2. Meta-analysis supports aspirin to reduce cardiovascular events

To take the posttest, go to: https://bit.ly/2GJLgSB
Expires January 24, 2020

3. Age of migraine onset may affect stroke risk

To take the posttest, go to: https://bit.ly/2ZAJ5YR
Expires January 24, 2020

4. Women with RA have reduced chance of live birth after assisted reproduction treatment

To take the posttest, go to: https://bit.ly/2VvKRLF
Expires January 27, 2020

5. New SLE disease activity measure beats SLEDAI-2K

To take the posttest, go to: https://bit.ly/2W8SVPA
Expires January 31, 2020

Adults with nonalcoholic fatty liver disease (NAFLD) were more likely to implement the Mediterranean diet when they had greater nutritional knowledge and skills, family support, nutritional care, and positive reinforcement in the media, according to an in-depth study of 19 patients.

snyferok/ThinkStock

Barriers to adopting the diet included “an obesogenic environment, life stressors, and demand for convenience. Poor understanding of the causes and significance of NAFLD adversely affected readiness to change dietary habits,” wrote Laura Haigh of Newcastle University in Newcastle Upon Tyne, England, and associates. The study, which included both standard quantitative methods and semistructured interviews, was published in Clinical Gastroenterology and Hepatology.

The Mediterranean diet emphasizes vegetables, legumes, fish, fruits, whole grains, nuts, and olive oil in lieu of processed foods, sweets, saturated fats, and red meat. This diet has been definitively shown to improve insulin sensitivity and steatosis, even when patients do not lose weight. This has sparked interest in its use for NAFLD disease, but keys to its successful adoption in Northern Europe are not well understood.

Therefore, the researchers recruited 19 NAFLD patients from a tertiary care center in the United Kingdom for a 12-week Mediterranean diet intervention. Most were female, white, in their late 50s, obese, and had type 2 diabetes. “Participants were taught behavioral strategies through the provision of shopping lists, meal planners, and recipes. No advice was given on calorie allowances or physical activities,” the investigators noted.

By using a 14-point assessment tool, they found that dietary adherence rose significantly at 12 weeks, compared with baseline (P = .006). In all, 79% of patients lost weight (mean, 2.4 kg; P = .001 versus baseline), and 72% significantly increased their serum level of HDL cholesterol. Interviews linked successful adoption of the diet with diverse factors, such as believing that NAFLD is lifestyle associated, realizing that healthier nutrition can improve health outcomes, and having access to transportation and budget grocery stories. Patients generally saw the Mediterranean diet as flexible and affordable, but they struggled to adopt it if they worked irregular hours, experienced substantial life stress or were very busy, or tended to eat for self-reward or self-comfort.

Other cited barriers included “diet saboteurs” (including spouses), the plethora of unhealthy foods available in patients’ environments, low nutritional or medical knowledge, and cultural, social, or taste incompatibility, the researchers reported. Taken together, the findings underscore “the futility of a one-size-fits-all approach” when implementing the Mediterranean diet in this population, they concluded. Instead, their patients valued a collaborative, tailored approach – ideally one that incorporated in-person and group-based treatment, as well as online support.

Funders included the North East of England hub of the Allied Health Professions Research Network, the Elucidating Pathways of Steatohepatitis consortium, the Horizon 2020 Framework Program of the European Union, and the Newcastle NIHR Biomedical Research Centre. The researchers reported having no conflicts of interest.

SOURCE: Haigh L et al. Clin Gastroenterol Hepatol. 2018 Oct 31. doi: 10.1016/j.cgh.2018.10.044.

Adults with nonalcoholic fatty liver disease (NAFLD) were more likely to implement the Mediterranean diet when they had greater nutritional knowledge and skills, family support, nutritional care, and positive reinforcement in the media, according to an in-depth study of 19 patients.

snyferok/ThinkStock

Barriers to adopting the diet included “an obesogenic environment, life stressors, and demand for convenience. Poor understanding of the causes and significance of NAFLD adversely affected readiness to change dietary habits,” wrote Laura Haigh of Newcastle University in Newcastle Upon Tyne, England, and associates. The study, which included both standard quantitative methods and semistructured interviews, was published in Clinical Gastroenterology and Hepatology.

The Mediterranean diet emphasizes vegetables, legumes, fish, fruits, whole grains, nuts, and olive oil in lieu of processed foods, sweets, saturated fats, and red meat. This diet has been definitively shown to improve insulin sensitivity and steatosis, even when patients do not lose weight. This has sparked interest in its use for NAFLD disease, but keys to its successful adoption in Northern Europe are not well understood.

Therefore, the researchers recruited 19 NAFLD patients from a tertiary care center in the United Kingdom for a 12-week Mediterranean diet intervention. Most were female, white, in their late 50s, obese, and had type 2 diabetes. “Participants were taught behavioral strategies through the provision of shopping lists, meal planners, and recipes. No advice was given on calorie allowances or physical activities,” the investigators noted.

By using a 14-point assessment tool, they found that dietary adherence rose significantly at 12 weeks, compared with baseline (P = .006). In all, 79% of patients lost weight (mean, 2.4 kg; P = .001 versus baseline), and 72% significantly increased their serum level of HDL cholesterol. Interviews linked successful adoption of the diet with diverse factors, such as believing that NAFLD is lifestyle associated, realizing that healthier nutrition can improve health outcomes, and having access to transportation and budget grocery stories. Patients generally saw the Mediterranean diet as flexible and affordable, but they struggled to adopt it if they worked irregular hours, experienced substantial life stress or were very busy, or tended to eat for self-reward or self-comfort.

Other cited barriers included “diet saboteurs” (including spouses), the plethora of unhealthy foods available in patients’ environments, low nutritional or medical knowledge, and cultural, social, or taste incompatibility, the researchers reported. Taken together, the findings underscore “the futility of a one-size-fits-all approach” when implementing the Mediterranean diet in this population, they concluded. Instead, their patients valued a collaborative, tailored approach – ideally one that incorporated in-person and group-based treatment, as well as online support.

Funders included the North East of England hub of the Allied Health Professions Research Network, the Elucidating Pathways of Steatohepatitis consortium, the Horizon 2020 Framework Program of the European Union, and the Newcastle NIHR Biomedical Research Centre. The researchers reported having no conflicts of interest.

SOURCE: Haigh L et al. Clin Gastroenterol Hepatol. 2018 Oct 31. doi: 10.1016/j.cgh.2018.10.044.

Adults with nonalcoholic fatty liver disease (NAFLD) were more likely to implement the Mediterranean diet when they had greater nutritional knowledge and skills, family support, nutritional care, and positive reinforcement in the media, according to an in-depth study of 19 patients.

snyferok/ThinkStock

Barriers to adopting the diet included “an obesogenic environment, life stressors, and demand for convenience. Poor understanding of the causes and significance of NAFLD adversely affected readiness to change dietary habits,” wrote Laura Haigh of Newcastle University in Newcastle Upon Tyne, England, and associates. The study, which included both standard quantitative methods and semistructured interviews, was published in Clinical Gastroenterology and Hepatology.

The Mediterranean diet emphasizes vegetables, legumes, fish, fruits, whole grains, nuts, and olive oil in lieu of processed foods, sweets, saturated fats, and red meat. This diet has been definitively shown to improve insulin sensitivity and steatosis, even when patients do not lose weight. This has sparked interest in its use for NAFLD disease, but keys to its successful adoption in Northern Europe are not well understood.

Therefore, the researchers recruited 19 NAFLD patients from a tertiary care center in the United Kingdom for a 12-week Mediterranean diet intervention. Most were female, white, in their late 50s, obese, and had type 2 diabetes. “Participants were taught behavioral strategies through the provision of shopping lists, meal planners, and recipes. No advice was given on calorie allowances or physical activities,” the investigators noted.

By using a 14-point assessment tool, they found that dietary adherence rose significantly at 12 weeks, compared with baseline (P = .006). In all, 79% of patients lost weight (mean, 2.4 kg; P = .001 versus baseline), and 72% significantly increased their serum level of HDL cholesterol. Interviews linked successful adoption of the diet with diverse factors, such as believing that NAFLD is lifestyle associated, realizing that healthier nutrition can improve health outcomes, and having access to transportation and budget grocery stories. Patients generally saw the Mediterranean diet as flexible and affordable, but they struggled to adopt it if they worked irregular hours, experienced substantial life stress or were very busy, or tended to eat for self-reward or self-comfort.

Other cited barriers included “diet saboteurs” (including spouses), the plethora of unhealthy foods available in patients’ environments, low nutritional or medical knowledge, and cultural, social, or taste incompatibility, the researchers reported. Taken together, the findings underscore “the futility of a one-size-fits-all approach” when implementing the Mediterranean diet in this population, they concluded. Instead, their patients valued a collaborative, tailored approach – ideally one that incorporated in-person and group-based treatment, as well as online support.

Funders included the North East of England hub of the Allied Health Professions Research Network, the Elucidating Pathways of Steatohepatitis consortium, the Horizon 2020 Framework Program of the European Union, and the Newcastle NIHR Biomedical Research Centre. The researchers reported having no conflicts of interest.

SOURCE: Haigh L et al. Clin Gastroenterol Hepatol. 2018 Oct 31. doi: 10.1016/j.cgh.2018.10.044.

LOS ANGELES – In patients with end-stage renal disease, women older than 50 years have a significantly higher mortality, compared with their male counterparts, results from an analysis of national data showed.

“The racial and ethnic disparities in the prevalence, treatment, risks, and outcomes of [hypertension] in patients with CKD [chronic kidney disease], are well recognized,” the study’s senior author, Ricardo Correa, MD, said in an interview in advance of the annual scientific and clinical congress of the American Association of Clinical Endocrinologists. “Whites have better control of blood pressure, compared with Hispanics or African Americans with CKD, for example. On the other hand, gender differences in the outcome of blood pressure control and mortality across the different CKD stages have been very poorly studied, with conflicting results.”

The importance of gender difference has been mostly the focus in cardiovascular diseases, he continued, with compelling data revealing a higher incidence in men than in women of similar age, and a menopause-associated increase in cardiovascular disease in women.

“Whether the same can be said for hypertension, remains to be elucidated,” said Dr. Correa, an endocrinologist who directs the diabetes and metabolism fellowship at the University of Arizona in Phoenix.

In what he said is the first study of its kind, Dr. Correa and his colleagues set out to determine if gender in the U.S. population and menopausal age affect the inpatient survival rate in hypertensive patients across different stages of CKD. They drew from the 2005-2012 National Inpatient Sample to identify 2,121,750 hospitalized hypertensive patients and compared a number of factors between men and women, including crude mortality and mortality per CKD stage, menopausal age, length of stay, and total hospital charges.

Of the 2,121,750 patients, 1,092,931 (52%) were men and 1,028,819 (48%) were women; their mean age was 65 years. Among women, 32% had stage 3 CKD, 15% had stage 4 disease, 3% had stage 5 CKD, and 54% had end-stage renal disease (ESRD). Among men, 33% had stage 3 CKD, 13% had stage 4 disease, 3% had stage 5 CKD, and 51% had ESRD. The researchers observed that in-hospital crude mortality was significantly higher for men, compared with a matched group of women at CKD stages 3 and 4 (3.09% vs. 3.29% for CDK 3; P less than .0001 and 4.05% vs. 4.36% for CDK 4; P = .0004), yet was nonsignificant among those with ESRD (4.68% vs. 4.83%; P = .45).

“One could hypothesize that cardiac remodeling in hemodialysis women may be different than that in hemodialysis men to the extent that it affects mortality,” Dr. Correa said. “However, it is unclear if the survival benefit for dialysis men is owing to the possibility of a selection bias or not. Dialysis women may not be receiving equal access to cardiovascular procedures or surgical interventions (arteriovenous fistula, for example) or women may not be offered adequate hemodialysis to the same extent as men are. Further investigations regarding sex-based differences in dialysis treatment are required.”

He acknowledged certain limitations of the study, including its observational design. “We lacked detailed information regarding the cause of death, dialysis efficiency, types of dialysis accesses, and left ventricular hypertrophy measurements. We did not account for transitions between different hemodialysis modalities [and] we do not have information about distances or traveling time to dialysis units.”

The study’s first author was Kelvin Tran, MD. The researchers reported having no financial disclosures.

[email protected]

LOS ANGELES – In patients with end-stage renal disease, women older than 50 years have a significantly higher mortality, compared with their male counterparts, results from an analysis of national data showed.

“The racial and ethnic disparities in the prevalence, treatment, risks, and outcomes of [hypertension] in patients with CKD [chronic kidney disease], are well recognized,” the study’s senior author, Ricardo Correa, MD, said in an interview in advance of the annual scientific and clinical congress of the American Association of Clinical Endocrinologists. “Whites have better control of blood pressure, compared with Hispanics or African Americans with CKD, for example. On the other hand, gender differences in the outcome of blood pressure control and mortality across the different CKD stages have been very poorly studied, with conflicting results.”

The importance of gender difference has been mostly the focus in cardiovascular diseases, he continued, with compelling data revealing a higher incidence in men than in women of similar age, and a menopause-associated increase in cardiovascular disease in women.

“Whether the same can be said for hypertension, remains to be elucidated,” said Dr. Correa, an endocrinologist who directs the diabetes and metabolism fellowship at the University of Arizona in Phoenix.

In what he said is the first study of its kind, Dr. Correa and his colleagues set out to determine if gender in the U.S. population and menopausal age affect the inpatient survival rate in hypertensive patients across different stages of CKD. They drew from the 2005-2012 National Inpatient Sample to identify 2,121,750 hospitalized hypertensive patients and compared a number of factors between men and women, including crude mortality and mortality per CKD stage, menopausal age, length of stay, and total hospital charges.

Of the 2,121,750 patients, 1,092,931 (52%) were men and 1,028,819 (48%) were women; their mean age was 65 years. Among women, 32% had stage 3 CKD, 15% had stage 4 disease, 3% had stage 5 CKD, and 54% had end-stage renal disease (ESRD). Among men, 33% had stage 3 CKD, 13% had stage 4 disease, 3% had stage 5 CKD, and 51% had ESRD. The researchers observed that in-hospital crude mortality was significantly higher for men, compared with a matched group of women at CKD stages 3 and 4 (3.09% vs. 3.29% for CDK 3; P less than .0001 and 4.05% vs. 4.36% for CDK 4; P = .0004), yet was nonsignificant among those with ESRD (4.68% vs. 4.83%; P = .45).

“One could hypothesize that cardiac remodeling in hemodialysis women may be different than that in hemodialysis men to the extent that it affects mortality,” Dr. Correa said. “However, it is unclear if the survival benefit for dialysis men is owing to the possibility of a selection bias or not. Dialysis women may not be receiving equal access to cardiovascular procedures or surgical interventions (arteriovenous fistula, for example) or women may not be offered adequate hemodialysis to the same extent as men are. Further investigations regarding sex-based differences in dialysis treatment are required.”

He acknowledged certain limitations of the study, including its observational design. “We lacked detailed information regarding the cause of death, dialysis efficiency, types of dialysis accesses, and left ventricular hypertrophy measurements. We did not account for transitions between different hemodialysis modalities [and] we do not have information about distances or traveling time to dialysis units.”

The study’s first author was Kelvin Tran, MD. The researchers reported having no financial disclosures.

[email protected]

LOS ANGELES – In patients with end-stage renal disease, women older than 50 years have a significantly higher mortality, compared with their male counterparts, results from an analysis of national data showed.

“The racial and ethnic disparities in the prevalence, treatment, risks, and outcomes of [hypertension] in patients with CKD [chronic kidney disease], are well recognized,” the study’s senior author, Ricardo Correa, MD, said in an interview in advance of the annual scientific and clinical congress of the American Association of Clinical Endocrinologists. “Whites have better control of blood pressure, compared with Hispanics or African Americans with CKD, for example. On the other hand, gender differences in the outcome of blood pressure control and mortality across the different CKD stages have been very poorly studied, with conflicting results.”

The importance of gender difference has been mostly the focus in cardiovascular diseases, he continued, with compelling data revealing a higher incidence in men than in women of similar age, and a menopause-associated increase in cardiovascular disease in women.

“Whether the same can be said for hypertension, remains to be elucidated,” said Dr. Correa, an endocrinologist who directs the diabetes and metabolism fellowship at the University of Arizona in Phoenix.

In what he said is the first study of its kind, Dr. Correa and his colleagues set out to determine if gender in the U.S. population and menopausal age affect the inpatient survival rate in hypertensive patients across different stages of CKD. They drew from the 2005-2012 National Inpatient Sample to identify 2,121,750 hospitalized hypertensive patients and compared a number of factors between men and women, including crude mortality and mortality per CKD stage, menopausal age, length of stay, and total hospital charges.

Of the 2,121,750 patients, 1,092,931 (52%) were men and 1,028,819 (48%) were women; their mean age was 65 years. Among women, 32% had stage 3 CKD, 15% had stage 4 disease, 3% had stage 5 CKD, and 54% had end-stage renal disease (ESRD). Among men, 33% had stage 3 CKD, 13% had stage 4 disease, 3% had stage 5 CKD, and 51% had ESRD. The researchers observed that in-hospital crude mortality was significantly higher for men, compared with a matched group of women at CKD stages 3 and 4 (3.09% vs. 3.29% for CDK 3; P less than .0001 and 4.05% vs. 4.36% for CDK 4; P = .0004), yet was nonsignificant among those with ESRD (4.68% vs. 4.83%; P = .45).

“One could hypothesize that cardiac remodeling in hemodialysis women may be different than that in hemodialysis men to the extent that it affects mortality,” Dr. Correa said. “However, it is unclear if the survival benefit for dialysis men is owing to the possibility of a selection bias or not. Dialysis women may not be receiving equal access to cardiovascular procedures or surgical interventions (arteriovenous fistula, for example) or women may not be offered adequate hemodialysis to the same extent as men are. Further investigations regarding sex-based differences in dialysis treatment are required.”

He acknowledged certain limitations of the study, including its observational design. “We lacked detailed information regarding the cause of death, dialysis efficiency, types of dialysis accesses, and left ventricular hypertrophy measurements. We did not account for transitions between different hemodialysis modalities [and] we do not have information about distances or traveling time to dialysis units.”

The study’s first author was Kelvin Tran, MD. The researchers reported having no financial disclosures.

[email protected]

Although stroke is a risk factor for osteoporosis, falls, and fractures, very few people who have experienced a recent stroke are either screened for osteoporosis or treated, research suggests.

Writing in Stroke, researchers presented an analysis of Ontario registry data from 16,581 patients who were aged 65 years or older and presented with stroke between 2003 and 2013.

Overall, just 5.1% of patients underwent bone mineral density testing. Of the 1,577 patients who had experienced a prior fracture, 71 (4.7%) had bone mineral density testing, and only 2.9% of those who had not had prior bone mineral density testing were tested after their stroke. Bone mineral density testing was more likely in patients who were younger, who were female, and who experienced a low-trauma fracture in the year after their stroke.

In total, 15.5% of patients were prescribed osteoporosis drugs in the first year after their stroke. However, only 7.8% of those who had fractures before the stroke and 14.8% of those with fractures after the stroke received osteoporosis treatment after the stroke. Patients who were female, had prior osteoporosis, had experienced prior fracture, had previously undergone bone mineral density testing, or had experienced a fracture or fall after their stroke were more likely to receive osteoporosis pharmacotherapy.

The authors found that the neither the severity of stroke nor the presence of other comorbidities was associated with an increased likelihood of screening or treatment of osteoporosis after the stroke.

Stroke is associated with up to a fourfold increased risk of osteoporosis and fracture, compared with healthy controls, most probably because of reduced mobility and an increased risk of falls, wrote Eshita Kapoor of the department of medicine at the University of Toronto and her coauthors.

“Screening and treatment may be particularly low poststroke because of under-recognition of osteoporosis as a consequence of stroke, a selective focus on the management of cardiovascular risk and stroke recovery, or factors such as dysphagia precluding use of oral bisphosphonates,” the authors wrote.

While the association is noted in U.S. stroke guidelines, there are few recommendations for treatment aside from fall prevention strategies, which the authors noted was a missed opportunity for prevention.

“Use of a risk prediction score to identify those at particularly high short-term risk of fractures after stroke may help to prioritize patients for osteoporosis testing and treatment,” they suggested.

The study was funded by the Heart and Stroke Foundation of Canada and was supported by ICES (Institute for Clinical Evaluative Sciences) and the Ontario Ministry of Health and Long-Term Care. One author declared consultancies for the pharmaceutical sector. No other conflicts of interest were declared.

SOURCE: Kapoor E et al. Stroke. 2019 April 25. doi: 10.1161/STROKEAHA.118.024685
 

Although stroke is a risk factor for osteoporosis, falls, and fractures, very few people who have experienced a recent stroke are either screened for osteoporosis or treated, research suggests.

Writing in Stroke, researchers presented an analysis of Ontario registry data from 16,581 patients who were aged 65 years or older and presented with stroke between 2003 and 2013.

Overall, just 5.1% of patients underwent bone mineral density testing. Of the 1,577 patients who had experienced a prior fracture, 71 (4.7%) had bone mineral density testing, and only 2.9% of those who had not had prior bone mineral density testing were tested after their stroke. Bone mineral density testing was more likely in patients who were younger, who were female, and who experienced a low-trauma fracture in the year after their stroke.

In total, 15.5% of patients were prescribed osteoporosis drugs in the first year after their stroke. However, only 7.8% of those who had fractures before the stroke and 14.8% of those with fractures after the stroke received osteoporosis treatment after the stroke. Patients who were female, had prior osteoporosis, had experienced prior fracture, had previously undergone bone mineral density testing, or had experienced a fracture or fall after their stroke were more likely to receive osteoporosis pharmacotherapy.

The authors found that the neither the severity of stroke nor the presence of other comorbidities was associated with an increased likelihood of screening or treatment of osteoporosis after the stroke.

Stroke is associated with up to a fourfold increased risk of osteoporosis and fracture, compared with healthy controls, most probably because of reduced mobility and an increased risk of falls, wrote Eshita Kapoor of the department of medicine at the University of Toronto and her coauthors.

“Screening and treatment may be particularly low poststroke because of under-recognition of osteoporosis as a consequence of stroke, a selective focus on the management of cardiovascular risk and stroke recovery, or factors such as dysphagia precluding use of oral bisphosphonates,” the authors wrote.

While the association is noted in U.S. stroke guidelines, there are few recommendations for treatment aside from fall prevention strategies, which the authors noted was a missed opportunity for prevention.

“Use of a risk prediction score to identify those at particularly high short-term risk of fractures after stroke may help to prioritize patients for osteoporosis testing and treatment,” they suggested.

The study was funded by the Heart and Stroke Foundation of Canada and was supported by ICES (Institute for Clinical Evaluative Sciences) and the Ontario Ministry of Health and Long-Term Care. One author declared consultancies for the pharmaceutical sector. No other conflicts of interest were declared.

SOURCE: Kapoor E et al. Stroke. 2019 April 25. doi: 10.1161/STROKEAHA.118.024685
 

Although stroke is a risk factor for osteoporosis, falls, and fractures, very few people who have experienced a recent stroke are either screened for osteoporosis or treated, research suggests.

Writing in Stroke, researchers presented an analysis of Ontario registry data from 16,581 patients who were aged 65 years or older and presented with stroke between 2003 and 2013.

Overall, just 5.1% of patients underwent bone mineral density testing. Of the 1,577 patients who had experienced a prior fracture, 71 (4.7%) had bone mineral density testing, and only 2.9% of those who had not had prior bone mineral density testing were tested after their stroke. Bone mineral density testing was more likely in patients who were younger, who were female, and who experienced a low-trauma fracture in the year after their stroke.

In total, 15.5% of patients were prescribed osteoporosis drugs in the first year after their stroke. However, only 7.8% of those who had fractures before the stroke and 14.8% of those with fractures after the stroke received osteoporosis treatment after the stroke. Patients who were female, had prior osteoporosis, had experienced prior fracture, had previously undergone bone mineral density testing, or had experienced a fracture or fall after their stroke were more likely to receive osteoporosis pharmacotherapy.

The authors found that the neither the severity of stroke nor the presence of other comorbidities was associated with an increased likelihood of screening or treatment of osteoporosis after the stroke.

Stroke is associated with up to a fourfold increased risk of osteoporosis and fracture, compared with healthy controls, most probably because of reduced mobility and an increased risk of falls, wrote Eshita Kapoor of the department of medicine at the University of Toronto and her coauthors.

“Screening and treatment may be particularly low poststroke because of under-recognition of osteoporosis as a consequence of stroke, a selective focus on the management of cardiovascular risk and stroke recovery, or factors such as dysphagia precluding use of oral bisphosphonates,” the authors wrote.

While the association is noted in U.S. stroke guidelines, there are few recommendations for treatment aside from fall prevention strategies, which the authors noted was a missed opportunity for prevention.

“Use of a risk prediction score to identify those at particularly high short-term risk of fractures after stroke may help to prioritize patients for osteoporosis testing and treatment,” they suggested.

The study was funded by the Heart and Stroke Foundation of Canada and was supported by ICES (Institute for Clinical Evaluative Sciences) and the Ontario Ministry of Health and Long-Term Care. One author declared consultancies for the pharmaceutical sector. No other conflicts of interest were declared.

SOURCE: Kapoor E et al. Stroke. 2019 April 25. doi: 10.1161/STROKEAHA.118.024685
 

LOS ANGELES – A significantly higher proportion of euthyroid patients with thyroid disease suffer from anxiety than from depression, regardless of Hashimoto’s autoimmunity, results from a cross-sectional study have shown.

“Thyroid disease is often associated with impaired quality of life and psychological well-being,” lead study author Anette Merke, MD, MS, said in an interview in advance of the annual scientific and clinical congress of the American Association of Clinical Endocrinologists. “In daily practice, anxiety and depression complaints are common in patients with thyroid dysfunctions. While depressive symptoms are often associated with hypothyroidism, anxiety is claimed to be mainly linked to hyperthyroidism. Data on euthyroid patients with thyroid disease are controversial. Some studies point out that autoimmunity itself contributes to psychosomatic malfunctions. Overall, the mechanisms underlying the interaction between thyroid dysfunction and neuropsychiatric processes are still unknown.”

Dr. Merke, of the Thyroid Center Bergstrasse in Bensheim, Germany, and her husband/coauthor Jüergen Merke, MD, PhD, used the self-administered German version of the validated Hospital Anxiety and Depression Scale (HADS-D) to perform a cross-sectional study of 215 euthyroid adults with thyroid disease between January and February of 2019. Of the 14 items on the measure, half relate to anxiety and the other half to depression. Each item on the HADS-D is scored from 0-3, and a score of 10 or higher is considered a positive case of anxiety or depression. Patients completed the HADS-D within 3 months of routine lab testing, and the researchers collected the patients’ demographic data after they had assessed the individual scores.

Of the 215 study participants, most (89%) were women, the mean age was 47 years, and the mean anxiety and depression scores were 6.68 and 4.68, respectively (P = .0001). There was no significant difference in severity with respect to anxiety or depression. Of the 70 patients (33%) with antibody-positive Hashimoto’s thyroiditis, the mean anxiety and depression scores were 7.26 and 4.17.


In patients with HADS-D scores of 10 or greater, 50 (23%) had prominent anxiety scores (mean, 12.4), whereas 22 (10%) had prominent depression scores (mean, 13.18). Among the subset of Hashimoto’s thyroiditis patients, 18 (26%) had a mean anxiety score of 12.6 and 8 (11%) had a mean depression score of 13.18. Overall, significantly more cases were found in those who met criteria for anxiety, compared with those who met criteria for depression (P = .0001), with no significant difference in severity of either condition.

Depressive symptoms are usually more closely associated with thyroid disease, and there are more studies that have examined that relationship, so “we were surprised to find no significant difference in depressive symptoms between our study cohort and the German general population,” Dr. Merke said. “We were also surprised that anxiety had a significantly higher incidence in the cohort.”

The findings suggest that clinicians should focus on signs of anxiety symptoms when dealing with euthyroid patients with thyroid disease who report psychosomatic impairments, she continued, especially when patients complain of not being able to relax and release somatic tension.

“According to HADS, fears and worries are an expression of anxiety, and not of depression,” Dr. Merke said. “With this in mind, doctors [should] actively ask [about] the above-mentioned symptoms and advise patients to learn relaxation techniques to improve their quality of life. Interdisciplinary collaboration is needed between clinicians and psychotherapeutic professionals for the sake of the patients and to evaluate a cause-and-effect relationship and potential risk factors for development of psychosomatic cofactors in thyroid and other chronic somatic diseases. We should all be aware that misinterpretation or even denial of psychosomatic complaints may lead to complications and even a higher mortality of somatic diseases, as shown for chronic heart failure. This could also be true for thyroid disease.”

Dr Merke acknowledged certain limitations of the study, including the fact that neither the duration of thyroid disease nor the use of specific thyroid medications was assessed. In addition, “the definition of euthyroidism in our study is somewhat broad, especially compared with the recommendations of the [American Association of Clinical Endocrinologists],” she said. “Division of the respective thyroid hormone status into quartiles may be helpful to indicate the critical thyroid hormone serum concentration, which may be associated with clinically relevant anxiety symptoms in euthyroid patients.”

Dr. Merke reported having no financial disclosures or conflict of interest.

[email protected]

LOS ANGELES – A significantly higher proportion of euthyroid patients with thyroid disease suffer from anxiety than from depression, regardless of Hashimoto’s autoimmunity, results from a cross-sectional study have shown.

“Thyroid disease is often associated with impaired quality of life and psychological well-being,” lead study author Anette Merke, MD, MS, said in an interview in advance of the annual scientific and clinical congress of the American Association of Clinical Endocrinologists. “In daily practice, anxiety and depression complaints are common in patients with thyroid dysfunctions. While depressive symptoms are often associated with hypothyroidism, anxiety is claimed to be mainly linked to hyperthyroidism. Data on euthyroid patients with thyroid disease are controversial. Some studies point out that autoimmunity itself contributes to psychosomatic malfunctions. Overall, the mechanisms underlying the interaction between thyroid dysfunction and neuropsychiatric processes are still unknown.”

Dr. Merke, of the Thyroid Center Bergstrasse in Bensheim, Germany, and her husband/coauthor Jüergen Merke, MD, PhD, used the self-administered German version of the validated Hospital Anxiety and Depression Scale (HADS-D) to perform a cross-sectional study of 215 euthyroid adults with thyroid disease between January and February of 2019. Of the 14 items on the measure, half relate to anxiety and the other half to depression. Each item on the HADS-D is scored from 0-3, and a score of 10 or higher is considered a positive case of anxiety or depression. Patients completed the HADS-D within 3 months of routine lab testing, and the researchers collected the patients’ demographic data after they had assessed the individual scores.

Of the 215 study participants, most (89%) were women, the mean age was 47 years, and the mean anxiety and depression scores were 6.68 and 4.68, respectively (P = .0001). There was no significant difference in severity with respect to anxiety or depression. Of the 70 patients (33%) with antibody-positive Hashimoto’s thyroiditis, the mean anxiety and depression scores were 7.26 and 4.17.


In patients with HADS-D scores of 10 or greater, 50 (23%) had prominent anxiety scores (mean, 12.4), whereas 22 (10%) had prominent depression scores (mean, 13.18). Among the subset of Hashimoto’s thyroiditis patients, 18 (26%) had a mean anxiety score of 12.6 and 8 (11%) had a mean depression score of 13.18. Overall, significantly more cases were found in those who met criteria for anxiety, compared with those who met criteria for depression (P = .0001), with no significant difference in severity of either condition.

Depressive symptoms are usually more closely associated with thyroid disease, and there are more studies that have examined that relationship, so “we were surprised to find no significant difference in depressive symptoms between our study cohort and the German general population,” Dr. Merke said. “We were also surprised that anxiety had a significantly higher incidence in the cohort.”

The findings suggest that clinicians should focus on signs of anxiety symptoms when dealing with euthyroid patients with thyroid disease who report psychosomatic impairments, she continued, especially when patients complain of not being able to relax and release somatic tension.

“According to HADS, fears and worries are an expression of anxiety, and not of depression,” Dr. Merke said. “With this in mind, doctors [should] actively ask [about] the above-mentioned symptoms and advise patients to learn relaxation techniques to improve their quality of life. Interdisciplinary collaboration is needed between clinicians and psychotherapeutic professionals for the sake of the patients and to evaluate a cause-and-effect relationship and potential risk factors for development of psychosomatic cofactors in thyroid and other chronic somatic diseases. We should all be aware that misinterpretation or even denial of psychosomatic complaints may lead to complications and even a higher mortality of somatic diseases, as shown for chronic heart failure. This could also be true for thyroid disease.”

Dr Merke acknowledged certain limitations of the study, including the fact that neither the duration of thyroid disease nor the use of specific thyroid medications was assessed. In addition, “the definition of euthyroidism in our study is somewhat broad, especially compared with the recommendations of the [American Association of Clinical Endocrinologists],” she said. “Division of the respective thyroid hormone status into quartiles may be helpful to indicate the critical thyroid hormone serum concentration, which may be associated with clinically relevant anxiety symptoms in euthyroid patients.”

Dr. Merke reported having no financial disclosures or conflict of interest.

[email protected]

LOS ANGELES – A significantly higher proportion of euthyroid patients with thyroid disease suffer from anxiety than from depression, regardless of Hashimoto’s autoimmunity, results from a cross-sectional study have shown.

“Thyroid disease is often associated with impaired quality of life and psychological well-being,” lead study author Anette Merke, MD, MS, said in an interview in advance of the annual scientific and clinical congress of the American Association of Clinical Endocrinologists. “In daily practice, anxiety and depression complaints are common in patients with thyroid dysfunctions. While depressive symptoms are often associated with hypothyroidism, anxiety is claimed to be mainly linked to hyperthyroidism. Data on euthyroid patients with thyroid disease are controversial. Some studies point out that autoimmunity itself contributes to psychosomatic malfunctions. Overall, the mechanisms underlying the interaction between thyroid dysfunction and neuropsychiatric processes are still unknown.”

Dr. Merke, of the Thyroid Center Bergstrasse in Bensheim, Germany, and her husband/coauthor Jüergen Merke, MD, PhD, used the self-administered German version of the validated Hospital Anxiety and Depression Scale (HADS-D) to perform a cross-sectional study of 215 euthyroid adults with thyroid disease between January and February of 2019. Of the 14 items on the measure, half relate to anxiety and the other half to depression. Each item on the HADS-D is scored from 0-3, and a score of 10 or higher is considered a positive case of anxiety or depression. Patients completed the HADS-D within 3 months of routine lab testing, and the researchers collected the patients’ demographic data after they had assessed the individual scores.

Of the 215 study participants, most (89%) were women, the mean age was 47 years, and the mean anxiety and depression scores were 6.68 and 4.68, respectively (P = .0001). There was no significant difference in severity with respect to anxiety or depression. Of the 70 patients (33%) with antibody-positive Hashimoto’s thyroiditis, the mean anxiety and depression scores were 7.26 and 4.17.


In patients with HADS-D scores of 10 or greater, 50 (23%) had prominent anxiety scores (mean, 12.4), whereas 22 (10%) had prominent depression scores (mean, 13.18). Among the subset of Hashimoto’s thyroiditis patients, 18 (26%) had a mean anxiety score of 12.6 and 8 (11%) had a mean depression score of 13.18. Overall, significantly more cases were found in those who met criteria for anxiety, compared with those who met criteria for depression (P = .0001), with no significant difference in severity of either condition.

Depressive symptoms are usually more closely associated with thyroid disease, and there are more studies that have examined that relationship, so “we were surprised to find no significant difference in depressive symptoms between our study cohort and the German general population,” Dr. Merke said. “We were also surprised that anxiety had a significantly higher incidence in the cohort.”

The findings suggest that clinicians should focus on signs of anxiety symptoms when dealing with euthyroid patients with thyroid disease who report psychosomatic impairments, she continued, especially when patients complain of not being able to relax and release somatic tension.

“According to HADS, fears and worries are an expression of anxiety, and not of depression,” Dr. Merke said. “With this in mind, doctors [should] actively ask [about] the above-mentioned symptoms and advise patients to learn relaxation techniques to improve their quality of life. Interdisciplinary collaboration is needed between clinicians and psychotherapeutic professionals for the sake of the patients and to evaluate a cause-and-effect relationship and potential risk factors for development of psychosomatic cofactors in thyroid and other chronic somatic diseases. We should all be aware that misinterpretation or even denial of psychosomatic complaints may lead to complications and even a higher mortality of somatic diseases, as shown for chronic heart failure. This could also be true for thyroid disease.”

Dr Merke acknowledged certain limitations of the study, including the fact that neither the duration of thyroid disease nor the use of specific thyroid medications was assessed. In addition, “the definition of euthyroidism in our study is somewhat broad, especially compared with the recommendations of the [American Association of Clinical Endocrinologists],” she said. “Division of the respective thyroid hormone status into quartiles may be helpful to indicate the critical thyroid hormone serum concentration, which may be associated with clinically relevant anxiety symptoms in euthyroid patients.”

Dr. Merke reported having no financial disclosures or conflict of interest.

[email protected]