Bariatric Surgery

WASHINGTON – Antibiotics given in advance of gastric bypass surgery preferentially alter the microbiome, nudging it toward a more “lean” physiologic profile.

Given before a sleeve gastrectomy, vancomycin, which has little gut penetration, barely shifted the high ratio of Firmicutes to Bacteroidetes, a profile typically associated with obesity and insulin resistance. But cefazolin, which has much higher gut penetration, suppressed the presence of Firmicutes, which metabolize fat, and allowed the expansion of carbohydrate-loving Bacteroidetes – a profile generally seen in lean people.

Cyrus Jahansouz, MD, of the University of Minnesota, Minneapolis, and his colleagues wanted to examine whether a shift in preoperative antibiotics might affect the way the microbiome re-establishes itself in the wake of vertical sleeve gastrectomy. They enrolled 32 patients who were candidates for the procedure. None had undergone prior gastrointestinal surgery, and none had been exposed to antibiotics in the 3 months prior to bariatric surgery. They were similar in age, weight, body mass index, and fasting glucose. The mean HbA1c was about 6%.

Patients were randomized to three groups: maximal diet therapy (800 calories per day) without surgery; vertical sleeve gastrectomy with the usual preoperative antibiotic cefazolin and the postsurgical diet; and vertical sleeve gastrectomy with preoperative vancomycin and the postsurgical diet. All patients gave a fecal sample immediately before surgery and another one 6 days after surgery.

Preoperative cluster analysis of bacterial DNA showed that all of the samples had a similar composition, predominated by Firmicutes species (60%-70%). Bacteroidetes species made up about 20%-30%, with Proteobacteriae, Actinobacteriae, Verrucomicrobia, and other phyla comprising the remainder of the microbiome.

At the second sampling, the diet-only group showed no microbiome changes at all. The vancomycin group showed a very small but not significant expansion of Bacteroidetes and reduction of Firmicutes.

Patients in the cefazolin group showed a significant shift in the ratio – and it was quite striking, Dr. Jahansouz said. Among these patients, Firmicutes had decreased from 70% to 40% of the community. Bacteroidetes showed a corresponding shift, increasing from 20% of the community to 45%. The findings are quite surprising, he noted, considering that only one dose of antibiotic was associated with the changes and that they were evident within just a few days.

Although “a little hard to interpret” because of its small size and short follow-up, the study suggests that antibiotic choice might contribute to the success of weight-loss surgery, Dr. Jahansouz said at the annual clinical congress of the American College of Surgeons.

“There are still several factors in the perioperative period that we have to study to be able to identify what other things might have also influenced the shift,” he said in an interview. “But I do think that, in the future, these changes can be manipulated to benefit metabolic outcomes.”

Two phyla – Bacteroidetes and Firmicutes – dominate the human gut microbiome in a dynamic ratio that is highly associated with the way energy is extracted from food. Bacteroidetes species specialize in carbohydrate digestion and Firmicutes in fat digestion. “In a lean, insulin-sensitive state, Bacteroidetes dominates the human gut microbiome,” Dr. Jahansouz said. “With the progression of obesity and insulin resistance, there is a subsequent shift in the microbiome phenotype, favoring the growth of Firmicutes at the expense and reduction of Bacteroidetes. This is a significant change, because this obesity-associated phenotype has an increased capacity to harvest energy. It’s not the same for a lean person to consume 1,000 calories as it is for an obese person to consume them.”

Bariatric surgery has been shown to alter the gut microbiome, shifting it toward this more “lean” profile (Cell Metab. 2015 Aug 4;22[2]:228-38). This shift may be an important component of the still not fully elucidated mechanisms by which bariatric surgery causes weight loss and normalizes insulin signaling, Dr. Jahansouz said.

Dr. Jahansouz is following this group of patients to explore whether there are differences in weight loss and insulin signaling. He also will track whether the microbiome stabilizes at its early postsurgical profile, or continues to shift, either toward an even higher Bacteroidetes to Firmicutes ratio, or back to a more “obese” profile.

He and his colleagues are also investigating the effect of antibiotics and gastric bypass surgery in mouse models. “I can say that antibiotics seem to have a remarkable impact on the effect of mouse sleeve gastrectomy. We’re not quite there yet with humans,” but the data are compelling.

Dr. Jahansouz said that he had no financial disclosures.

[email protected]

On Twitter @Alz_Gal

WASHINGTON – Antibiotics given in advance of gastric bypass surgery preferentially alter the microbiome, nudging it toward a more “lean” physiologic profile.

Given before a sleeve gastrectomy, vancomycin, which has little gut penetration, barely shifted the high ratio of Firmicutes to Bacteroidetes, a profile typically associated with obesity and insulin resistance. But cefazolin, which has much higher gut penetration, suppressed the presence of Firmicutes, which metabolize fat, and allowed the expansion of carbohydrate-loving Bacteroidetes – a profile generally seen in lean people.

Cyrus Jahansouz, MD, of the University of Minnesota, Minneapolis, and his colleagues wanted to examine whether a shift in preoperative antibiotics might affect the way the microbiome re-establishes itself in the wake of vertical sleeve gastrectomy. They enrolled 32 patients who were candidates for the procedure. None had undergone prior gastrointestinal surgery, and none had been exposed to antibiotics in the 3 months prior to bariatric surgery. They were similar in age, weight, body mass index, and fasting glucose. The mean HbA1c was about 6%.

Patients were randomized to three groups: maximal diet therapy (800 calories per day) without surgery; vertical sleeve gastrectomy with the usual preoperative antibiotic cefazolin and the postsurgical diet; and vertical sleeve gastrectomy with preoperative vancomycin and the postsurgical diet. All patients gave a fecal sample immediately before surgery and another one 6 days after surgery.

Preoperative cluster analysis of bacterial DNA showed that all of the samples had a similar composition, predominated by Firmicutes species (60%-70%). Bacteroidetes species made up about 20%-30%, with Proteobacteriae, Actinobacteriae, Verrucomicrobia, and other phyla comprising the remainder of the microbiome.

At the second sampling, the diet-only group showed no microbiome changes at all. The vancomycin group showed a very small but not significant expansion of Bacteroidetes and reduction of Firmicutes.

Patients in the cefazolin group showed a significant shift in the ratio – and it was quite striking, Dr. Jahansouz said. Among these patients, Firmicutes had decreased from 70% to 40% of the community. Bacteroidetes showed a corresponding shift, increasing from 20% of the community to 45%. The findings are quite surprising, he noted, considering that only one dose of antibiotic was associated with the changes and that they were evident within just a few days.

Although “a little hard to interpret” because of its small size and short follow-up, the study suggests that antibiotic choice might contribute to the success of weight-loss surgery, Dr. Jahansouz said at the annual clinical congress of the American College of Surgeons.

“There are still several factors in the perioperative period that we have to study to be able to identify what other things might have also influenced the shift,” he said in an interview. “But I do think that, in the future, these changes can be manipulated to benefit metabolic outcomes.”

Two phyla – Bacteroidetes and Firmicutes – dominate the human gut microbiome in a dynamic ratio that is highly associated with the way energy is extracted from food. Bacteroidetes species specialize in carbohydrate digestion and Firmicutes in fat digestion. “In a lean, insulin-sensitive state, Bacteroidetes dominates the human gut microbiome,” Dr. Jahansouz said. “With the progression of obesity and insulin resistance, there is a subsequent shift in the microbiome phenotype, favoring the growth of Firmicutes at the expense and reduction of Bacteroidetes. This is a significant change, because this obesity-associated phenotype has an increased capacity to harvest energy. It’s not the same for a lean person to consume 1,000 calories as it is for an obese person to consume them.”

Bariatric surgery has been shown to alter the gut microbiome, shifting it toward this more “lean” profile (Cell Metab. 2015 Aug 4;22[2]:228-38). This shift may be an important component of the still not fully elucidated mechanisms by which bariatric surgery causes weight loss and normalizes insulin signaling, Dr. Jahansouz said.

Dr. Jahansouz is following this group of patients to explore whether there are differences in weight loss and insulin signaling. He also will track whether the microbiome stabilizes at its early postsurgical profile, or continues to shift, either toward an even higher Bacteroidetes to Firmicutes ratio, or back to a more “obese” profile.

He and his colleagues are also investigating the effect of antibiotics and gastric bypass surgery in mouse models. “I can say that antibiotics seem to have a remarkable impact on the effect of mouse sleeve gastrectomy. We’re not quite there yet with humans,” but the data are compelling.

Dr. Jahansouz said that he had no financial disclosures.

[email protected]

On Twitter @Alz_Gal

WASHINGTON – Antibiotics given in advance of gastric bypass surgery preferentially alter the microbiome, nudging it toward a more “lean” physiologic profile.

Given before a sleeve gastrectomy, vancomycin, which has little gut penetration, barely shifted the high ratio of Firmicutes to Bacteroidetes, a profile typically associated with obesity and insulin resistance. But cefazolin, which has much higher gut penetration, suppressed the presence of Firmicutes, which metabolize fat, and allowed the expansion of carbohydrate-loving Bacteroidetes – a profile generally seen in lean people.

Cyrus Jahansouz, MD, of the University of Minnesota, Minneapolis, and his colleagues wanted to examine whether a shift in preoperative antibiotics might affect the way the microbiome re-establishes itself in the wake of vertical sleeve gastrectomy. They enrolled 32 patients who were candidates for the procedure. None had undergone prior gastrointestinal surgery, and none had been exposed to antibiotics in the 3 months prior to bariatric surgery. They were similar in age, weight, body mass index, and fasting glucose. The mean HbA1c was about 6%.

Patients were randomized to three groups: maximal diet therapy (800 calories per day) without surgery; vertical sleeve gastrectomy with the usual preoperative antibiotic cefazolin and the postsurgical diet; and vertical sleeve gastrectomy with preoperative vancomycin and the postsurgical diet. All patients gave a fecal sample immediately before surgery and another one 6 days after surgery.

Preoperative cluster analysis of bacterial DNA showed that all of the samples had a similar composition, predominated by Firmicutes species (60%-70%). Bacteroidetes species made up about 20%-30%, with Proteobacteriae, Actinobacteriae, Verrucomicrobia, and other phyla comprising the remainder of the microbiome.

At the second sampling, the diet-only group showed no microbiome changes at all. The vancomycin group showed a very small but not significant expansion of Bacteroidetes and reduction of Firmicutes.

Patients in the cefazolin group showed a significant shift in the ratio – and it was quite striking, Dr. Jahansouz said. Among these patients, Firmicutes had decreased from 70% to 40% of the community. Bacteroidetes showed a corresponding shift, increasing from 20% of the community to 45%. The findings are quite surprising, he noted, considering that only one dose of antibiotic was associated with the changes and that they were evident within just a few days.

Although “a little hard to interpret” because of its small size and short follow-up, the study suggests that antibiotic choice might contribute to the success of weight-loss surgery, Dr. Jahansouz said at the annual clinical congress of the American College of Surgeons.

“There are still several factors in the perioperative period that we have to study to be able to identify what other things might have also influenced the shift,” he said in an interview. “But I do think that, in the future, these changes can be manipulated to benefit metabolic outcomes.”

Two phyla – Bacteroidetes and Firmicutes – dominate the human gut microbiome in a dynamic ratio that is highly associated with the way energy is extracted from food. Bacteroidetes species specialize in carbohydrate digestion and Firmicutes in fat digestion. “In a lean, insulin-sensitive state, Bacteroidetes dominates the human gut microbiome,” Dr. Jahansouz said. “With the progression of obesity and insulin resistance, there is a subsequent shift in the microbiome phenotype, favoring the growth of Firmicutes at the expense and reduction of Bacteroidetes. This is a significant change, because this obesity-associated phenotype has an increased capacity to harvest energy. It’s not the same for a lean person to consume 1,000 calories as it is for an obese person to consume them.”

Bariatric surgery has been shown to alter the gut microbiome, shifting it toward this more “lean” profile (Cell Metab. 2015 Aug 4;22[2]:228-38). This shift may be an important component of the still not fully elucidated mechanisms by which bariatric surgery causes weight loss and normalizes insulin signaling, Dr. Jahansouz said.

Dr. Jahansouz is following this group of patients to explore whether there are differences in weight loss and insulin signaling. He also will track whether the microbiome stabilizes at its early postsurgical profile, or continues to shift, either toward an even higher Bacteroidetes to Firmicutes ratio, or back to a more “obese” profile.

He and his colleagues are also investigating the effect of antibiotics and gastric bypass surgery in mouse models. “I can say that antibiotics seem to have a remarkable impact on the effect of mouse sleeve gastrectomy. We’re not quite there yet with humans,” but the data are compelling.

Dr. Jahansouz said that he had no financial disclosures.

[email protected]

On Twitter @Alz_Gal

Clinical outcomes of surgery and patient-reported outcomes of function, disability, and health status are two different measures of surgical success.

A large study of patients who had bariatric surgery showed that patient-reported outcomes were correlated with long-term weight loss but not with short-term complication rates. In addition, obesity-specific patient-reported quality of life scores were associated with a reduction in medications required for the treatment of obesity-related conditions.

“Clinical outcomes, such as perioperative morbidity and mortality, are commonly used to benchmark hospital performance,” reported Jennifer F. Waljee, MD, and her associates at the University of Michigan, Ann Arbor (Ann Surg. 2016. doi: 10.1097/SLA.0000000000001852).

“However, for many surgical procedures, such as bariatric surgery ... complications may be rare, and may not entirely reflect treatment effectiveness. Alternatively, patient-reported measures of function, disability, and health status may offer a unique and more reliable assessment of provider quality and performance,” she explained. Yet despite growing interest in using patient-reported measures, many important questions regarding their accuracy, applicability, and clinical utility remain. The purpose of this study was, therefore, to evaluate how patient-reported quality of life measures compared to short-term and long-term clinical outcomes in patients who underwent bariatric surgery.

©Vasilis Varsakelis/fotolia.com

The majority of the study’s 11,420 participants were female (79.8%), were white (84.1%), and underwent Roux-en-Y laparoscopic gastric bypass (56.8%). For each study participant, both short-term and long-term clinical outcome measures were obtained from medical board review. Short-term clinical outcomes were defined as the rate of perioperative complications within 30 days of bariatric surgery. Percent excess weight loss at 1 year post surgery was used as a long-term clinical outcome.

In addition, two patient-reported outcomes were collected: an overall health-related quality of life score called the Health and Activities Limitations Index (HALex) and an obesity-specific quality of life score, the Bariatric Quality of Life (BQL) index, which measures well-being, social and physical functioning, and obesity-related symptoms.

Multivariate and linear regression models demonstrated that short-term complication rates were not correlated to the overall patient-reported quality of life score (P = .32) or to the obesity-specific BQL score (P = .74).

However, the long-term measure of excess weight loss at 1 year post surgery was significantly associated with both overall and obesity-specific patient-reported measures of health-related quality of life (P less than .002 and P less than .001 respectively).

Moreover, scores indicating improved quality of life were associated with greater weight loss.

Finally, comorbidity resolution, estimated by the reduction in the use of medications taken to treat conditions related to obesity, was significantly associated with the obesity-specific measure, BQL, but not the overall quality of life measure, HALex.

“In conclusion, [patient-reported outcomes] are distinct from clinical outcomes,” investigators wrote. Patient-reported outcomes “provide an opportunity for improved population-based cost-effectiveness analyses using outcomes germane to procedures performed for symptomatology and improving QOL,” they added.

The Agency for Healthcare Research and Quality supported the research. The investigators reported having no disclosures.

[email protected]

On Twitter @jessnicolecraig

Clinical outcomes of surgery and patient-reported outcomes of function, disability, and health status are two different measures of surgical success.

A large study of patients who had bariatric surgery showed that patient-reported outcomes were correlated with long-term weight loss but not with short-term complication rates. In addition, obesity-specific patient-reported quality of life scores were associated with a reduction in medications required for the treatment of obesity-related conditions.

“Clinical outcomes, such as perioperative morbidity and mortality, are commonly used to benchmark hospital performance,” reported Jennifer F. Waljee, MD, and her associates at the University of Michigan, Ann Arbor (Ann Surg. 2016. doi: 10.1097/SLA.0000000000001852).

“However, for many surgical procedures, such as bariatric surgery ... complications may be rare, and may not entirely reflect treatment effectiveness. Alternatively, patient-reported measures of function, disability, and health status may offer a unique and more reliable assessment of provider quality and performance,” she explained. Yet despite growing interest in using patient-reported measures, many important questions regarding their accuracy, applicability, and clinical utility remain. The purpose of this study was, therefore, to evaluate how patient-reported quality of life measures compared to short-term and long-term clinical outcomes in patients who underwent bariatric surgery.

©Vasilis Varsakelis/fotolia.com

The majority of the study’s 11,420 participants were female (79.8%), were white (84.1%), and underwent Roux-en-Y laparoscopic gastric bypass (56.8%). For each study participant, both short-term and long-term clinical outcome measures were obtained from medical board review. Short-term clinical outcomes were defined as the rate of perioperative complications within 30 days of bariatric surgery. Percent excess weight loss at 1 year post surgery was used as a long-term clinical outcome.

In addition, two patient-reported outcomes were collected: an overall health-related quality of life score called the Health and Activities Limitations Index (HALex) and an obesity-specific quality of life score, the Bariatric Quality of Life (BQL) index, which measures well-being, social and physical functioning, and obesity-related symptoms.

Multivariate and linear regression models demonstrated that short-term complication rates were not correlated to the overall patient-reported quality of life score (P = .32) or to the obesity-specific BQL score (P = .74).

However, the long-term measure of excess weight loss at 1 year post surgery was significantly associated with both overall and obesity-specific patient-reported measures of health-related quality of life (P less than .002 and P less than .001 respectively).

Moreover, scores indicating improved quality of life were associated with greater weight loss.

Finally, comorbidity resolution, estimated by the reduction in the use of medications taken to treat conditions related to obesity, was significantly associated with the obesity-specific measure, BQL, but not the overall quality of life measure, HALex.

“In conclusion, [patient-reported outcomes] are distinct from clinical outcomes,” investigators wrote. Patient-reported outcomes “provide an opportunity for improved population-based cost-effectiveness analyses using outcomes germane to procedures performed for symptomatology and improving QOL,” they added.

The Agency for Healthcare Research and Quality supported the research. The investigators reported having no disclosures.

[email protected]

On Twitter @jessnicolecraig

Clinical outcomes of surgery and patient-reported outcomes of function, disability, and health status are two different measures of surgical success.

A large study of patients who had bariatric surgery showed that patient-reported outcomes were correlated with long-term weight loss but not with short-term complication rates. In addition, obesity-specific patient-reported quality of life scores were associated with a reduction in medications required for the treatment of obesity-related conditions.

“Clinical outcomes, such as perioperative morbidity and mortality, are commonly used to benchmark hospital performance,” reported Jennifer F. Waljee, MD, and her associates at the University of Michigan, Ann Arbor (Ann Surg. 2016. doi: 10.1097/SLA.0000000000001852).

“However, for many surgical procedures, such as bariatric surgery ... complications may be rare, and may not entirely reflect treatment effectiveness. Alternatively, patient-reported measures of function, disability, and health status may offer a unique and more reliable assessment of provider quality and performance,” she explained. Yet despite growing interest in using patient-reported measures, many important questions regarding their accuracy, applicability, and clinical utility remain. The purpose of this study was, therefore, to evaluate how patient-reported quality of life measures compared to short-term and long-term clinical outcomes in patients who underwent bariatric surgery.

©Vasilis Varsakelis/fotolia.com

The majority of the study’s 11,420 participants were female (79.8%), were white (84.1%), and underwent Roux-en-Y laparoscopic gastric bypass (56.8%). For each study participant, both short-term and long-term clinical outcome measures were obtained from medical board review. Short-term clinical outcomes were defined as the rate of perioperative complications within 30 days of bariatric surgery. Percent excess weight loss at 1 year post surgery was used as a long-term clinical outcome.

In addition, two patient-reported outcomes were collected: an overall health-related quality of life score called the Health and Activities Limitations Index (HALex) and an obesity-specific quality of life score, the Bariatric Quality of Life (BQL) index, which measures well-being, social and physical functioning, and obesity-related symptoms.

Multivariate and linear regression models demonstrated that short-term complication rates were not correlated to the overall patient-reported quality of life score (P = .32) or to the obesity-specific BQL score (P = .74).

However, the long-term measure of excess weight loss at 1 year post surgery was significantly associated with both overall and obesity-specific patient-reported measures of health-related quality of life (P less than .002 and P less than .001 respectively).

Moreover, scores indicating improved quality of life were associated with greater weight loss.

Finally, comorbidity resolution, estimated by the reduction in the use of medications taken to treat conditions related to obesity, was significantly associated with the obesity-specific measure, BQL, but not the overall quality of life measure, HALex.

“In conclusion, [patient-reported outcomes] are distinct from clinical outcomes,” investigators wrote. Patient-reported outcomes “provide an opportunity for improved population-based cost-effectiveness analyses using outcomes germane to procedures performed for symptomatology and improving QOL,” they added.

The Agency for Healthcare Research and Quality supported the research. The investigators reported having no disclosures.

[email protected]

On Twitter @jessnicolecraig

SAN DIEGO – Device companies are working hard to bring obesity management to the endoscopy suite.

The field is called endobariatrics, and its goal is to fill the gap between surgery and pharmacotherapy. Drugs and lifestyle counseling don’t work too well, but a lot of people don’t want to go under the knife, so something is needed in the middle. Endobariatrics has the potential to be a boon for both obese patients and gastroenterology practices.

Several new investigational devices and approaches were showcased at the annual Digestive Disease Week; some “are beginning to approach the kind of results we see with surgical techniques,” said Steven Edmundowicz, MD, medical director of the University of Colorado Digestive Health Center, Aurora.

“We are seeing a tremendous amount of development in this space, but it’s early, and we have to be cautious,” he said. There have already been a few disappointments, including the EndoBarrier, a fluoropolymer liner anchored in the duodenal bulb and unfurled down the duodenum to block food absorption. A key U.S. trial was recently halted due to liver abscesses.

Dr. Edmundowicz reviewed the latest developments presented at DDW.

Self-assembling magnets for dual-path enteral anastomoses

The goal of the GI Windows system is to create a partial jejunoileal, side to side bypass without surgery. A 28-mm magnet ring is introduced to the ileum by colonoscopy, and a second ring to the jejunum by endoscopy. The rings snap together and tissue caught between them dies from pressure necrosis, leaving patients with a jejunoileal communication. Once food reaches that point, it either diverts through the anastomosis or continues past it down the digestive track. The magnets pass after the anastomosis forms in a week or so.

In a 6-month feasibility study from the Czech Republic, 10 obese patients lost 28.3% of their excess weight without diet restrictions. Those with diabetes had a mean hemoglobin A_1c drop of 1.8%, and normalization of fasting blood glucose levels. The procedure took just over an hour and a half after the first five cases.

“I am very excited about [this]; I really want to see where the data are going,” Dr. Edmundowicz said.

Duodenal mucosal resurfacing

The idea of the Revita System (Fractyl) is to ablate “diabetic mucosa” in the duodenum so that normal mucosa can replace it. Saline is injected endoscopically under a portion of the duodenal mucosa to lift it off the muscularis; once isolated, the mucosa is destroyed – some in the audience thought “cooked” was a better word – by exposure to a hot water balloon catheter threaded into the lumen.

Thirty-nine overweight or obese type 2 diabetics had a 1.2% improvement at 6 months from a baseline hemoglobin A_1c of 9.6% in a series from Santiago, Chile. Weight loss was modest in the trial; the system is being developed for type 2 diabetics.

There is some histologic support for the notion of a diabetic mucosa with both structural and hormonal aberrations, but it’s unclear if it’s a sign or cause of sickness. Even so, “the mucosa regenerates” and won’t be diabetic “for a while” after the procedure, said investigator Manoel Galvao Neto, MD, of the Gastro Obeso Center, São Paulo.

Gastric balloons

Inflating a balloon in the stomach to make people feel full isn’t new, but the notion of putting the balloon into a capsule that patients can swallow and inflating it through a tether is a more recent notion.

The Obalon (Obalon Therapeutics) is one such device. In an unblinded, sham-controlled trial with 336 obese patients, subjects who got the 250-mL, nitrogen-filled Obalons – most received three – lost about 3% more of their total body weight at 24 weeks than those who did not. Although swallowed, Obalon is removed endoscopically. Meanwhile, 34 obese patients who swallowed the 550-mL, fluid-filled Elipse balloon (Allurion) had a total body weight loss of 9.5% and mean excess weight loss of 37.2% at 4 months, by which time Elipse deflates on its own and passes without endoscopic retrieval.

“This is a very promising approach. I am very excited about digested balloons,” said Dr. Edmundowicz, an investigator in the Obalon study.

Endoscopic sleeve gastroplasty

Endoscopic sleeve gastroplasty duplicates sleeve gastrectomy with stitches placed endoscopically to seal off the greater curvature of the stomach; functionally, patients are left with a narrow sleeve of a stomach. In a multicenter series presented at DDW, 242 patients had a mean total body weight loss of 19.8% at 18 months, with a low incidence of complications. “Weight loss appears to be continuing,” Dr. Edmundowicz said. Investigators used the Apollo OverStitch (Apollo Endosurgery) to place the sutures.

Aspiration therapy

With Food and Drug Administration approval on June 14, AspireAssist (Aspire Bariatrics) is probably the best known of the newer approaches. Patients drain a portion of their meals through an endoscopically placed percutaneous gastrostomy tube a half hour or so after eating. It takes 5-10 minutes. The agency is eager to keep it out of the hands of bulimics.

One-year data were reported at DDW; 111 obese AspireAssist subjects lost a mean of 37.2% of their excess weight versus 13% in 60 patients randomized to lifestyle counseling alone.

“It may not be aesthetically pleasing, but it certainly works. It’s a viable technology,” said Dr. Edmundowicz, who was an investigator.

The studies were funded by companies developing the devices and techniques. Dr. Edmundowicz has stock options, or is a consultant or researcher, Aspire, Obalon, GI Dynamics, Elira, and other firms.

[email protected]

SAN DIEGO – Device companies are working hard to bring obesity management to the endoscopy suite.

The field is called endobariatrics, and its goal is to fill the gap between surgery and pharmacotherapy. Drugs and lifestyle counseling don’t work too well, but a lot of people don’t want to go under the knife, so something is needed in the middle. Endobariatrics has the potential to be a boon for both obese patients and gastroenterology practices.

Several new investigational devices and approaches were showcased at the annual Digestive Disease Week; some “are beginning to approach the kind of results we see with surgical techniques,” said Steven Edmundowicz, MD, medical director of the University of Colorado Digestive Health Center, Aurora.

“We are seeing a tremendous amount of development in this space, but it’s early, and we have to be cautious,” he said. There have already been a few disappointments, including the EndoBarrier, a fluoropolymer liner anchored in the duodenal bulb and unfurled down the duodenum to block food absorption. A key U.S. trial was recently halted due to liver abscesses.

Dr. Edmundowicz reviewed the latest developments presented at DDW.

Self-assembling magnets for dual-path enteral anastomoses

The goal of the GI Windows system is to create a partial jejunoileal, side to side bypass without surgery. A 28-mm magnet ring is introduced to the ileum by colonoscopy, and a second ring to the jejunum by endoscopy. The rings snap together and tissue caught between them dies from pressure necrosis, leaving patients with a jejunoileal communication. Once food reaches that point, it either diverts through the anastomosis or continues past it down the digestive track. The magnets pass after the anastomosis forms in a week or so.

In a 6-month feasibility study from the Czech Republic, 10 obese patients lost 28.3% of their excess weight without diet restrictions. Those with diabetes had a mean hemoglobin A_1c drop of 1.8%, and normalization of fasting blood glucose levels. The procedure took just over an hour and a half after the first five cases.

“I am very excited about [this]; I really want to see where the data are going,” Dr. Edmundowicz said.

Duodenal mucosal resurfacing

The idea of the Revita System (Fractyl) is to ablate “diabetic mucosa” in the duodenum so that normal mucosa can replace it. Saline is injected endoscopically under a portion of the duodenal mucosa to lift it off the muscularis; once isolated, the mucosa is destroyed – some in the audience thought “cooked” was a better word – by exposure to a hot water balloon catheter threaded into the lumen.

Thirty-nine overweight or obese type 2 diabetics had a 1.2% improvement at 6 months from a baseline hemoglobin A_1c of 9.6% in a series from Santiago, Chile. Weight loss was modest in the trial; the system is being developed for type 2 diabetics.

There is some histologic support for the notion of a diabetic mucosa with both structural and hormonal aberrations, but it’s unclear if it’s a sign or cause of sickness. Even so, “the mucosa regenerates” and won’t be diabetic “for a while” after the procedure, said investigator Manoel Galvao Neto, MD, of the Gastro Obeso Center, São Paulo.

Gastric balloons

Inflating a balloon in the stomach to make people feel full isn’t new, but the notion of putting the balloon into a capsule that patients can swallow and inflating it through a tether is a more recent notion.

The Obalon (Obalon Therapeutics) is one such device. In an unblinded, sham-controlled trial with 336 obese patients, subjects who got the 250-mL, nitrogen-filled Obalons – most received three – lost about 3% more of their total body weight at 24 weeks than those who did not. Although swallowed, Obalon is removed endoscopically. Meanwhile, 34 obese patients who swallowed the 550-mL, fluid-filled Elipse balloon (Allurion) had a total body weight loss of 9.5% and mean excess weight loss of 37.2% at 4 months, by which time Elipse deflates on its own and passes without endoscopic retrieval.

“This is a very promising approach. I am very excited about digested balloons,” said Dr. Edmundowicz, an investigator in the Obalon study.

Endoscopic sleeve gastroplasty

Endoscopic sleeve gastroplasty duplicates sleeve gastrectomy with stitches placed endoscopically to seal off the greater curvature of the stomach; functionally, patients are left with a narrow sleeve of a stomach. In a multicenter series presented at DDW, 242 patients had a mean total body weight loss of 19.8% at 18 months, with a low incidence of complications. “Weight loss appears to be continuing,” Dr. Edmundowicz said. Investigators used the Apollo OverStitch (Apollo Endosurgery) to place the sutures.

Aspiration therapy

With Food and Drug Administration approval on June 14, AspireAssist (Aspire Bariatrics) is probably the best known of the newer approaches. Patients drain a portion of their meals through an endoscopically placed percutaneous gastrostomy tube a half hour or so after eating. It takes 5-10 minutes. The agency is eager to keep it out of the hands of bulimics.

One-year data were reported at DDW; 111 obese AspireAssist subjects lost a mean of 37.2% of their excess weight versus 13% in 60 patients randomized to lifestyle counseling alone.

“It may not be aesthetically pleasing, but it certainly works. It’s a viable technology,” said Dr. Edmundowicz, who was an investigator.

The studies were funded by companies developing the devices and techniques. Dr. Edmundowicz has stock options, or is a consultant or researcher, Aspire, Obalon, GI Dynamics, Elira, and other firms.

[email protected]

SAN DIEGO – Device companies are working hard to bring obesity management to the endoscopy suite.

The field is called endobariatrics, and its goal is to fill the gap between surgery and pharmacotherapy. Drugs and lifestyle counseling don’t work too well, but a lot of people don’t want to go under the knife, so something is needed in the middle. Endobariatrics has the potential to be a boon for both obese patients and gastroenterology practices.

Several new investigational devices and approaches were showcased at the annual Digestive Disease Week; some “are beginning to approach the kind of results we see with surgical techniques,” said Steven Edmundowicz, MD, medical director of the University of Colorado Digestive Health Center, Aurora.

“We are seeing a tremendous amount of development in this space, but it’s early, and we have to be cautious,” he said. There have already been a few disappointments, including the EndoBarrier, a fluoropolymer liner anchored in the duodenal bulb and unfurled down the duodenum to block food absorption. A key U.S. trial was recently halted due to liver abscesses.

Dr. Edmundowicz reviewed the latest developments presented at DDW.

Self-assembling magnets for dual-path enteral anastomoses

The goal of the GI Windows system is to create a partial jejunoileal, side to side bypass without surgery. A 28-mm magnet ring is introduced to the ileum by colonoscopy, and a second ring to the jejunum by endoscopy. The rings snap together and tissue caught between them dies from pressure necrosis, leaving patients with a jejunoileal communication. Once food reaches that point, it either diverts through the anastomosis or continues past it down the digestive track. The magnets pass after the anastomosis forms in a week or so.

In a 6-month feasibility study from the Czech Republic, 10 obese patients lost 28.3% of their excess weight without diet restrictions. Those with diabetes had a mean hemoglobin A_1c drop of 1.8%, and normalization of fasting blood glucose levels. The procedure took just over an hour and a half after the first five cases.

“I am very excited about [this]; I really want to see where the data are going,” Dr. Edmundowicz said.

Duodenal mucosal resurfacing

The idea of the Revita System (Fractyl) is to ablate “diabetic mucosa” in the duodenum so that normal mucosa can replace it. Saline is injected endoscopically under a portion of the duodenal mucosa to lift it off the muscularis; once isolated, the mucosa is destroyed – some in the audience thought “cooked” was a better word – by exposure to a hot water balloon catheter threaded into the lumen.

Thirty-nine overweight or obese type 2 diabetics had a 1.2% improvement at 6 months from a baseline hemoglobin A_1c of 9.6% in a series from Santiago, Chile. Weight loss was modest in the trial; the system is being developed for type 2 diabetics.

There is some histologic support for the notion of a diabetic mucosa with both structural and hormonal aberrations, but it’s unclear if it’s a sign or cause of sickness. Even so, “the mucosa regenerates” and won’t be diabetic “for a while” after the procedure, said investigator Manoel Galvao Neto, MD, of the Gastro Obeso Center, São Paulo.

Gastric balloons

Inflating a balloon in the stomach to make people feel full isn’t new, but the notion of putting the balloon into a capsule that patients can swallow and inflating it through a tether is a more recent notion.

The Obalon (Obalon Therapeutics) is one such device. In an unblinded, sham-controlled trial with 336 obese patients, subjects who got the 250-mL, nitrogen-filled Obalons – most received three – lost about 3% more of their total body weight at 24 weeks than those who did not. Although swallowed, Obalon is removed endoscopically. Meanwhile, 34 obese patients who swallowed the 550-mL, fluid-filled Elipse balloon (Allurion) had a total body weight loss of 9.5% and mean excess weight loss of 37.2% at 4 months, by which time Elipse deflates on its own and passes without endoscopic retrieval.

“This is a very promising approach. I am very excited about digested balloons,” said Dr. Edmundowicz, an investigator in the Obalon study.

Endoscopic sleeve gastroplasty

Endoscopic sleeve gastroplasty duplicates sleeve gastrectomy with stitches placed endoscopically to seal off the greater curvature of the stomach; functionally, patients are left with a narrow sleeve of a stomach. In a multicenter series presented at DDW, 242 patients had a mean total body weight loss of 19.8% at 18 months, with a low incidence of complications. “Weight loss appears to be continuing,” Dr. Edmundowicz said. Investigators used the Apollo OverStitch (Apollo Endosurgery) to place the sutures.

Aspiration therapy

With Food and Drug Administration approval on June 14, AspireAssist (Aspire Bariatrics) is probably the best known of the newer approaches. Patients drain a portion of their meals through an endoscopically placed percutaneous gastrostomy tube a half hour or so after eating. It takes 5-10 minutes. The agency is eager to keep it out of the hands of bulimics.

One-year data were reported at DDW; 111 obese AspireAssist subjects lost a mean of 37.2% of their excess weight versus 13% in 60 patients randomized to lifestyle counseling alone.

“It may not be aesthetically pleasing, but it certainly works. It’s a viable technology,” said Dr. Edmundowicz, who was an investigator.

The studies were funded by companies developing the devices and techniques. Dr. Edmundowicz has stock options, or is a consultant or researcher, Aspire, Obalon, GI Dynamics, Elira, and other firms.

[email protected]

NEW ORLEANS – If the yardstick for measuring the cost-effectiveness of an operation or a medical treatment is that it costs less than $50,000 for each quality-adjusted life-year gained, then weight-loss surgery as a treatment for type 2 diabetes is cost-effective.

However, more long-term follow-up is needed to determine the true value of metabolic or bariatric surgery such as gastric bypass, compared with medical treatment for type 2 diabetes. Studies of bariatric surgery in the nondiabetic population found it was most cost-effective in the following scenarios: in women; in the morbidly obese vs. the moderately obese; in patients with obesity-related comorbidities including diabetes; when the procedures were performed laparoscopically; and when the studies themselves received industry support.

In people with diabetes, the results were similar. “Diabetes metabolic surgery is more cost-effective early in the course of type 2 diabetes compared to later in the course, when performed laparoscopically, and again when the study received support from industry,” reported Dr. William H. Herman, professor of epidemiology and internal medicine at the University of Michigan School of Public Health in Ann Arbor and director of the Michigan Center for Diabetes Translational Research.

He reviewed 11 economic analyses of bariatric surgery and concluded that all exceeded the benchmark for cost-effectiveness based on the cost per quality-adjusted life-year (QALY) gained. Six studies evaluated the general population of obese people and found that the cost-effectiveness ratios ranged from $1,600 to $44,000 per QALY gained. The remaining five studies involved obese patients with type 2 diabetes, two of which reported cost-effectiveness ratios of $2,000 to $23,000 per QALY gained; and the remaining three studies actually reporting a cost-savings. “In other words, the money spent on these interventions was more than recouped in the savings resulting from reduced downstream medical costs,” Dr. Herman reported at the American Diabetes Association scientific sessions.

The studies that found gastric bypass cost-saving in diabetes are noteworthy, Dr. Herman said. “If an intervention is more effective and less costly than a comparator intervention, then it is cost-saving, and that really is an unusual finding in health or medicine; perhaps 10% or 15% of interventions turn out to be cost-saving,” he said. “These are interventions that we want to adopt and put into practice pretty much without question.”

By the same measure, if an intervention is more costly and less effective, it’s easy to dismiss “out of hand,” Dr. Herman said. However, interpreting some of the studies he evaluated was more nuanced. “The problem occurs when a new treatment is both more effective but more costly, which was the case with two of the five analyses of metabolic surgery, and all of the analysis of bariatric surgery in the nondiabetic population,” he said

While gastric bypass surgery for type 2 diabetes is a good value, Dr. Herman added a few caveats. “When one looks at other interventions in similar categories, metformin for diabetes prevention has recently been shown to be cost-saving,” he said. He also said surgery is more cost-effective than marginally cost-effective interventions like intensive glycemic management for people with newly diagnosed type 2 diabetes or retinal screening every year vs. every 2 years.

One key issue with the existing evidence on cost-effectiveness of metabolic surgery for type 2 diabetes that Dr. Herman elucidated is how the studies accounted for participants lost to follow-up. “We know that a patient lost to follow-up may have a less favorable outcome than one who returns for follow-up,” he said. There are two ways studies can account for lost patients: the available-case analysis, which assumes that the patients lost to follow-up have the same rates of remission; and the attrition-adjusted available case follow-up, which uses a worst-case imputation. “I would argue that to account for attrition bias, remission rates calculated using the cases available for follow-up should be adjusted using worst-case imputation,” Dr. Herman said.

He pointed out another limitation when calculating the value of gastric bypass surgery for type 2 diabetes: “There are no randomized clinical trials of metabolic surgery that describe its long-term impact on diabetes treatments, complications, comorbidities, and survival. And it really is going be very important to get these data to confirm the cost-effectiveness of metabolic surgery.”

Among the shortcomings of the existing literature he noted are the assumptions that treatment-related adverse events are self-limited, that body mass index (BMI) achieved up to 5 years after surgery will remain stable, and that diabetes will not relapse. “The data are pretty good now on reversal, remission, hernia repair, and those sorts of things, but we need to look at longer downstream costs associated with surgery, including the need for cholecystectomy, joint replacements, and nutritional deficiencies that may occur and do clearly have financial implications,” he said.

At the same time, the analyses on gastric bypass surgery for type 2 diabetes could be more favorable if they account for improvements in health-related quality-of-life and rely less on cross-sectional data. Dr. Herman said, “I would argue that using cross-sectional data to estimate changes in health-related quality of life as a function of BMI underestimates the improvements on health-related quality-of-life associated with weight loss and will in fact underestimate the cost utility of interventions for obesity treatment,” he said.

Dr. Herman added, “Clearly the evidence to date suggests that metabolic surgery is cost-effective, but I’ll be more assured when I see longer-term follow-up.”

Dr. Herman has no financial relationships to disclose.

NEW ORLEANS – If the yardstick for measuring the cost-effectiveness of an operation or a medical treatment is that it costs less than $50,000 for each quality-adjusted life-year gained, then weight-loss surgery as a treatment for type 2 diabetes is cost-effective.

However, more long-term follow-up is needed to determine the true value of metabolic or bariatric surgery such as gastric bypass, compared with medical treatment for type 2 diabetes. Studies of bariatric surgery in the nondiabetic population found it was most cost-effective in the following scenarios: in women; in the morbidly obese vs. the moderately obese; in patients with obesity-related comorbidities including diabetes; when the procedures were performed laparoscopically; and when the studies themselves received industry support.

In people with diabetes, the results were similar. “Diabetes metabolic surgery is more cost-effective early in the course of type 2 diabetes compared to later in the course, when performed laparoscopically, and again when the study received support from industry,” reported Dr. William H. Herman, professor of epidemiology and internal medicine at the University of Michigan School of Public Health in Ann Arbor and director of the Michigan Center for Diabetes Translational Research.

He reviewed 11 economic analyses of bariatric surgery and concluded that all exceeded the benchmark for cost-effectiveness based on the cost per quality-adjusted life-year (QALY) gained. Six studies evaluated the general population of obese people and found that the cost-effectiveness ratios ranged from $1,600 to $44,000 per QALY gained. The remaining five studies involved obese patients with type 2 diabetes, two of which reported cost-effectiveness ratios of $2,000 to $23,000 per QALY gained; and the remaining three studies actually reporting a cost-savings. “In other words, the money spent on these interventions was more than recouped in the savings resulting from reduced downstream medical costs,” Dr. Herman reported at the American Diabetes Association scientific sessions.

The studies that found gastric bypass cost-saving in diabetes are noteworthy, Dr. Herman said. “If an intervention is more effective and less costly than a comparator intervention, then it is cost-saving, and that really is an unusual finding in health or medicine; perhaps 10% or 15% of interventions turn out to be cost-saving,” he said. “These are interventions that we want to adopt and put into practice pretty much without question.”

By the same measure, if an intervention is more costly and less effective, it’s easy to dismiss “out of hand,” Dr. Herman said. However, interpreting some of the studies he evaluated was more nuanced. “The problem occurs when a new treatment is both more effective but more costly, which was the case with two of the five analyses of metabolic surgery, and all of the analysis of bariatric surgery in the nondiabetic population,” he said

While gastric bypass surgery for type 2 diabetes is a good value, Dr. Herman added a few caveats. “When one looks at other interventions in similar categories, metformin for diabetes prevention has recently been shown to be cost-saving,” he said. He also said surgery is more cost-effective than marginally cost-effective interventions like intensive glycemic management for people with newly diagnosed type 2 diabetes or retinal screening every year vs. every 2 years.

One key issue with the existing evidence on cost-effectiveness of metabolic surgery for type 2 diabetes that Dr. Herman elucidated is how the studies accounted for participants lost to follow-up. “We know that a patient lost to follow-up may have a less favorable outcome than one who returns for follow-up,” he said. There are two ways studies can account for lost patients: the available-case analysis, which assumes that the patients lost to follow-up have the same rates of remission; and the attrition-adjusted available case follow-up, which uses a worst-case imputation. “I would argue that to account for attrition bias, remission rates calculated using the cases available for follow-up should be adjusted using worst-case imputation,” Dr. Herman said.

He pointed out another limitation when calculating the value of gastric bypass surgery for type 2 diabetes: “There are no randomized clinical trials of metabolic surgery that describe its long-term impact on diabetes treatments, complications, comorbidities, and survival. And it really is going be very important to get these data to confirm the cost-effectiveness of metabolic surgery.”

Among the shortcomings of the existing literature he noted are the assumptions that treatment-related adverse events are self-limited, that body mass index (BMI) achieved up to 5 years after surgery will remain stable, and that diabetes will not relapse. “The data are pretty good now on reversal, remission, hernia repair, and those sorts of things, but we need to look at longer downstream costs associated with surgery, including the need for cholecystectomy, joint replacements, and nutritional deficiencies that may occur and do clearly have financial implications,” he said.

At the same time, the analyses on gastric bypass surgery for type 2 diabetes could be more favorable if they account for improvements in health-related quality-of-life and rely less on cross-sectional data. Dr. Herman said, “I would argue that using cross-sectional data to estimate changes in health-related quality of life as a function of BMI underestimates the improvements on health-related quality-of-life associated with weight loss and will in fact underestimate the cost utility of interventions for obesity treatment,” he said.

Dr. Herman added, “Clearly the evidence to date suggests that metabolic surgery is cost-effective, but I’ll be more assured when I see longer-term follow-up.”

Dr. Herman has no financial relationships to disclose.

NEW ORLEANS – If the yardstick for measuring the cost-effectiveness of an operation or a medical treatment is that it costs less than $50,000 for each quality-adjusted life-year gained, then weight-loss surgery as a treatment for type 2 diabetes is cost-effective.

However, more long-term follow-up is needed to determine the true value of metabolic or bariatric surgery such as gastric bypass, compared with medical treatment for type 2 diabetes. Studies of bariatric surgery in the nondiabetic population found it was most cost-effective in the following scenarios: in women; in the morbidly obese vs. the moderately obese; in patients with obesity-related comorbidities including diabetes; when the procedures were performed laparoscopically; and when the studies themselves received industry support.

In people with diabetes, the results were similar. “Diabetes metabolic surgery is more cost-effective early in the course of type 2 diabetes compared to later in the course, when performed laparoscopically, and again when the study received support from industry,” reported Dr. William H. Herman, professor of epidemiology and internal medicine at the University of Michigan School of Public Health in Ann Arbor and director of the Michigan Center for Diabetes Translational Research.

He reviewed 11 economic analyses of bariatric surgery and concluded that all exceeded the benchmark for cost-effectiveness based on the cost per quality-adjusted life-year (QALY) gained. Six studies evaluated the general population of obese people and found that the cost-effectiveness ratios ranged from $1,600 to $44,000 per QALY gained. The remaining five studies involved obese patients with type 2 diabetes, two of which reported cost-effectiveness ratios of $2,000 to $23,000 per QALY gained; and the remaining three studies actually reporting a cost-savings. “In other words, the money spent on these interventions was more than recouped in the savings resulting from reduced downstream medical costs,” Dr. Herman reported at the American Diabetes Association scientific sessions.

The studies that found gastric bypass cost-saving in diabetes are noteworthy, Dr. Herman said. “If an intervention is more effective and less costly than a comparator intervention, then it is cost-saving, and that really is an unusual finding in health or medicine; perhaps 10% or 15% of interventions turn out to be cost-saving,” he said. “These are interventions that we want to adopt and put into practice pretty much without question.”

By the same measure, if an intervention is more costly and less effective, it’s easy to dismiss “out of hand,” Dr. Herman said. However, interpreting some of the studies he evaluated was more nuanced. “The problem occurs when a new treatment is both more effective but more costly, which was the case with two of the five analyses of metabolic surgery, and all of the analysis of bariatric surgery in the nondiabetic population,” he said

While gastric bypass surgery for type 2 diabetes is a good value, Dr. Herman added a few caveats. “When one looks at other interventions in similar categories, metformin for diabetes prevention has recently been shown to be cost-saving,” he said. He also said surgery is more cost-effective than marginally cost-effective interventions like intensive glycemic management for people with newly diagnosed type 2 diabetes or retinal screening every year vs. every 2 years.

One key issue with the existing evidence on cost-effectiveness of metabolic surgery for type 2 diabetes that Dr. Herman elucidated is how the studies accounted for participants lost to follow-up. “We know that a patient lost to follow-up may have a less favorable outcome than one who returns for follow-up,” he said. There are two ways studies can account for lost patients: the available-case analysis, which assumes that the patients lost to follow-up have the same rates of remission; and the attrition-adjusted available case follow-up, which uses a worst-case imputation. “I would argue that to account for attrition bias, remission rates calculated using the cases available for follow-up should be adjusted using worst-case imputation,” Dr. Herman said.

He pointed out another limitation when calculating the value of gastric bypass surgery for type 2 diabetes: “There are no randomized clinical trials of metabolic surgery that describe its long-term impact on diabetes treatments, complications, comorbidities, and survival. And it really is going be very important to get these data to confirm the cost-effectiveness of metabolic surgery.”

Among the shortcomings of the existing literature he noted are the assumptions that treatment-related adverse events are self-limited, that body mass index (BMI) achieved up to 5 years after surgery will remain stable, and that diabetes will not relapse. “The data are pretty good now on reversal, remission, hernia repair, and those sorts of things, but we need to look at longer downstream costs associated with surgery, including the need for cholecystectomy, joint replacements, and nutritional deficiencies that may occur and do clearly have financial implications,” he said.

At the same time, the analyses on gastric bypass surgery for type 2 diabetes could be more favorable if they account for improvements in health-related quality-of-life and rely less on cross-sectional data. Dr. Herman said, “I would argue that using cross-sectional data to estimate changes in health-related quality of life as a function of BMI underestimates the improvements on health-related quality-of-life associated with weight loss and will in fact underestimate the cost utility of interventions for obesity treatment,” he said.

Dr. Herman added, “Clearly the evidence to date suggests that metabolic surgery is cost-effective, but I’ll be more assured when I see longer-term follow-up.”

Dr. Herman has no financial relationships to disclose.

Until recently, bariatric surgery was considered a cosmetic operation with little physiologic importance. A series of preliminary randomized clinical trials, however, have suggested that bariatric surgery may have importance in mitigating the adverse pathophysiology associated with obesity, including type 2 diabetes and some cardiovascular risk factors.

The finding of a surgical method of modifying this disease, which has occupied research for the last century, is somewhat unexpected after the many false starts associated with medical interventions. The two most popular surgical procedures, the gastric bypass and the sleeve gastrectomy performed using laparoscopic techniques, are currently being performed in obese patients with BMIs of greater than 35 with very low morbidly and rare mortality events. Several nonrandomized and prospective trials have examined the effect of bariatric surgery and reported beneficial effects on diabetes regression and significant reduction in major cardiovascular disease ( JAMA 2012;307:56-65).

The recent report of the 3-year follow-up of the STAMPEDE (Surgical Therapy And Medications Potentially Eradicate Diabetes Efficiently) trial ( N. Engl. J. Med. 2014;370:2002-13) provides additional physiologic information on the benefits of bariatric surgery in 150 obese diabetic patients aged 20-60 years with BMIs of 27-43, compared with intensive medical therapy. Patients were randomized to three arms: intensive medical therapy, gastric bypass, or sleeve gastrectomy. Most of the patients were white women with a history of diabetes for 8.3 years; the mean hemoglobin A_1c was 9.3%. At baseline, 43% of the patients required insulin therapy. The primary endpoint was the achievement of HbA_1c of 6% or less, which was achieved in 5% of the medically treated patients, compared with 38% in the gastric bypass group and 24% in the sleeve gastrectomy group. Decrease in BMI was the only measure that predicted the achievement of the HbA_1c endpoint. Body weight decreased by 4.5% in the intensive medical group, 24.5% in the gastric bypass group, and 21.1% in the sleeve gastrectomy group. Significant decreases in low-density lipoprotein cholesterol and increases in high-density lipoprotein cholesterol were achieved in both surgical intervention groups, compared with the intensive medical care group. In addition, medical control of diabetes was improved and 69% and 43% of the gastrectomy and sleeve bypass group, respectively, were no longer requiring insulin therapy. There was, however, no significant difference in the change in blood pressure in the three groups. There were no life-threatening complications or deaths in the groups, but there were a number of complications associated with the procedure.

The metabolic changes associated with bariatric surgery reported in STAMPEDE open the door for future randomized studies examining long-term morbidity and mortality benefits that may be attributed to this therapy. Bariatric surgery is being performed widely in the United States with very low mortality and morbidity. Previous short-term studies have reported the benefit of bariatric surgery, compared with intensive medical therapy. The longer duration of follow-up in STAMPEDE emphasizes the need for larger randomized trials of this method of therapy. The study of the surgical patients may also provide new insight into the relationship of body fat to the expression of type 2 diabetes.

The prevention of medical disease using surgical techniques in clinical medicine has not been a particularly fertile road of investigation. Intervention in the treatment of coronary artery disease with bypass surgery although associated with symptomatic benefit and with some exceptions, has not been overwhelmingly successful in affecting the long-term mortality of that disease. Bariatric surgery may be the first surgical intervention that can arrest or even reverse type 2 diabetes and its many sequelae.

Dr. Goldstein, medical editor of Cardiology News, is professor of medicine at Wayne State University and division head emeritus of cardiovascular medicine at Henry Ford Hospital, both in Detroit. He is on data safety monitoring committees for the National Institutes of Health and several pharmaceutical companies.

Until recently, bariatric surgery was considered a cosmetic operation with little physiologic importance. A series of preliminary randomized clinical trials, however, have suggested that bariatric surgery may have importance in mitigating the adverse pathophysiology associated with obesity, including type 2 diabetes and some cardiovascular risk factors.

The finding of a surgical method of modifying this disease, which has occupied research for the last century, is somewhat unexpected after the many false starts associated with medical interventions. The two most popular surgical procedures, the gastric bypass and the sleeve gastrectomy performed using laparoscopic techniques, are currently being performed in obese patients with BMIs of greater than 35 with very low morbidly and rare mortality events. Several nonrandomized and prospective trials have examined the effect of bariatric surgery and reported beneficial effects on diabetes regression and significant reduction in major cardiovascular disease ( JAMA 2012;307:56-65).

The recent report of the 3-year follow-up of the STAMPEDE (Surgical Therapy And Medications Potentially Eradicate Diabetes Efficiently) trial ( N. Engl. J. Med. 2014;370:2002-13) provides additional physiologic information on the benefits of bariatric surgery in 150 obese diabetic patients aged 20-60 years with BMIs of 27-43, compared with intensive medical therapy. Patients were randomized to three arms: intensive medical therapy, gastric bypass, or sleeve gastrectomy. Most of the patients were white women with a history of diabetes for 8.3 years; the mean hemoglobin A_1c was 9.3%. At baseline, 43% of the patients required insulin therapy. The primary endpoint was the achievement of HbA_1c of 6% or less, which was achieved in 5% of the medically treated patients, compared with 38% in the gastric bypass group and 24% in the sleeve gastrectomy group. Decrease in BMI was the only measure that predicted the achievement of the HbA_1c endpoint. Body weight decreased by 4.5% in the intensive medical group, 24.5% in the gastric bypass group, and 21.1% in the sleeve gastrectomy group. Significant decreases in low-density lipoprotein cholesterol and increases in high-density lipoprotein cholesterol were achieved in both surgical intervention groups, compared with the intensive medical care group. In addition, medical control of diabetes was improved and 69% and 43% of the gastrectomy and sleeve bypass group, respectively, were no longer requiring insulin therapy. There was, however, no significant difference in the change in blood pressure in the three groups. There were no life-threatening complications or deaths in the groups, but there were a number of complications associated with the procedure.

The metabolic changes associated with bariatric surgery reported in STAMPEDE open the door for future randomized studies examining long-term morbidity and mortality benefits that may be attributed to this therapy. Bariatric surgery is being performed widely in the United States with very low mortality and morbidity. Previous short-term studies have reported the benefit of bariatric surgery, compared with intensive medical therapy. The longer duration of follow-up in STAMPEDE emphasizes the need for larger randomized trials of this method of therapy. The study of the surgical patients may also provide new insight into the relationship of body fat to the expression of type 2 diabetes.

The prevention of medical disease using surgical techniques in clinical medicine has not been a particularly fertile road of investigation. Intervention in the treatment of coronary artery disease with bypass surgery although associated with symptomatic benefit and with some exceptions, has not been overwhelmingly successful in affecting the long-term mortality of that disease. Bariatric surgery may be the first surgical intervention that can arrest or even reverse type 2 diabetes and its many sequelae.

Dr. Goldstein, medical editor of Cardiology News, is professor of medicine at Wayne State University and division head emeritus of cardiovascular medicine at Henry Ford Hospital, both in Detroit. He is on data safety monitoring committees for the National Institutes of Health and several pharmaceutical companies.

Until recently, bariatric surgery was considered a cosmetic operation with little physiologic importance. A series of preliminary randomized clinical trials, however, have suggested that bariatric surgery may have importance in mitigating the adverse pathophysiology associated with obesity, including type 2 diabetes and some cardiovascular risk factors.

The finding of a surgical method of modifying this disease, which has occupied research for the last century, is somewhat unexpected after the many false starts associated with medical interventions. The two most popular surgical procedures, the gastric bypass and the sleeve gastrectomy performed using laparoscopic techniques, are currently being performed in obese patients with BMIs of greater than 35 with very low morbidly and rare mortality events. Several nonrandomized and prospective trials have examined the effect of bariatric surgery and reported beneficial effects on diabetes regression and significant reduction in major cardiovascular disease ( JAMA 2012;307:56-65).

The recent report of the 3-year follow-up of the STAMPEDE (Surgical Therapy And Medications Potentially Eradicate Diabetes Efficiently) trial ( N. Engl. J. Med. 2014;370:2002-13) provides additional physiologic information on the benefits of bariatric surgery in 150 obese diabetic patients aged 20-60 years with BMIs of 27-43, compared with intensive medical therapy. Patients were randomized to three arms: intensive medical therapy, gastric bypass, or sleeve gastrectomy. Most of the patients were white women with a history of diabetes for 8.3 years; the mean hemoglobin A_1c was 9.3%. At baseline, 43% of the patients required insulin therapy. The primary endpoint was the achievement of HbA_1c of 6% or less, which was achieved in 5% of the medically treated patients, compared with 38% in the gastric bypass group and 24% in the sleeve gastrectomy group. Decrease in BMI was the only measure that predicted the achievement of the HbA_1c endpoint. Body weight decreased by 4.5% in the intensive medical group, 24.5% in the gastric bypass group, and 21.1% in the sleeve gastrectomy group. Significant decreases in low-density lipoprotein cholesterol and increases in high-density lipoprotein cholesterol were achieved in both surgical intervention groups, compared with the intensive medical care group. In addition, medical control of diabetes was improved and 69% and 43% of the gastrectomy and sleeve bypass group, respectively, were no longer requiring insulin therapy. There was, however, no significant difference in the change in blood pressure in the three groups. There were no life-threatening complications or deaths in the groups, but there were a number of complications associated with the procedure.

The metabolic changes associated with bariatric surgery reported in STAMPEDE open the door for future randomized studies examining long-term morbidity and mortality benefits that may be attributed to this therapy. Bariatric surgery is being performed widely in the United States with very low mortality and morbidity. Previous short-term studies have reported the benefit of bariatric surgery, compared with intensive medical therapy. The longer duration of follow-up in STAMPEDE emphasizes the need for larger randomized trials of this method of therapy. The study of the surgical patients may also provide new insight into the relationship of body fat to the expression of type 2 diabetes.

The prevention of medical disease using surgical techniques in clinical medicine has not been a particularly fertile road of investigation. Intervention in the treatment of coronary artery disease with bypass surgery although associated with symptomatic benefit and with some exceptions, has not been overwhelmingly successful in affecting the long-term mortality of that disease. Bariatric surgery may be the first surgical intervention that can arrest or even reverse type 2 diabetes and its many sequelae.

Dr. Goldstein, medical editor of Cardiology News, is professor of medicine at Wayne State University and division head emeritus of cardiovascular medicine at Henry Ford Hospital, both in Detroit. He is on data safety monitoring committees for the National Institutes of Health and several pharmaceutical companies.