Sleeve Gastrectomy vs Mini Gastric Bypass: Regain and GLP-1s

Sleeve gastrectomy vs mini gastric bypass is largely a question of reflux and durability. A sleeve removes about 80 percent of the stomach, takes about 30 minutes in Dr. Rakesh Durkhure's hands and brings 25 to 30 kilograms of weight loss, but acidity persists and weight regain can begin after about two years. For a patient with acidity, he advises a mini gastric bypass or a SASI bypass instead.

Bariatric surgery offers a menu of operations, and the central skill is matching the operation to the patient. Dr. Rakesh Durkhure, Head - General, MI & Bariatric Surgery (Unit IV), Artemis Hospitals, Gurugram, India, describes himself as a bariatric surgeon who can equally be called a metabolic surgeon: for many of his patients the target is not only weight but type 2 diabetes. His separate masterclass on obesity, metabolic syndrome and the role of bariatric surgery deals with diagnosis and outcomes. This article concentrates on the choice among the operations, why weight returns after a sleeve and how it is revised, the C-peptide test in diabetes surgery, and where the new weight-loss injections fit.

Sleeve gastrectomy vs mini gastric bypass: the five operations compared

Dr. Durkhure compared five options, each with a different trade-off:

• Intragastric balloon: placed endoscopically and temporary; a loss of only 15 to 20 kilograms.
• Sleeve gastrectomy: about 80 percent of the stomach removed; about 30 minutes and a one-day stay; 25 to 30 kilograms lost; acidity persists and regain can begin after about two years.
• Mini gastric bypass: a small pouch joined to a loop of intestine, with the length bypassed set to the patient's goals; his preference below a BMI of 55 or 60, and an alternative to the sleeve for patients with acidity.
• SASI bypass: a sleeve combined with a single connection to the ileum; the target weight can effectively be designed, and it controls diabetes.
• Roux-en-Y gastric bypass: the full bypass, reserved for a BMI above 55 or 60.

BMI, or body mass index, is weight in kilograms divided by the square of height in metres. Hospital costs for these operations are listed on the bariatric surgery cost page.

The intragastric balloon

The balloon is placed endoscopically: the stomach is inspected, the balloon is introduced and filled, and it then occupies part of the stomach cavity. Intragastric balloons are temporary devices, typically left in place for around six months before removal. Dr. Durkhure noted that surgeons rarely use the balloon now, because it produces a loss of only 15 to 20 kilograms. It remains available for a patient who prefers it.

Sleeve gastrectomy

In a sleeve gastrectomy, about 80 percent of the stomach is removed with a stapler, leaving a narrow, banana-shaped tube. Dr. Durkhure called it simple: a one-day stay, an operating time of about 30 minutes in his hands, and a weight loss of around 25 to 30 kilograms.

He was equally clear about its two weaknesses. Weight regain can begin after about two years. And acidity persists: a patient who has reflux before a sleeve will still have it afterwards. For a patient with acidity, he advises a mini gastric bypass or a SASI bypass instead.

Mini gastric bypass (one anastomosis gastric bypass)

The mini gastric bypass, also called the one anastomosis gastric bypass (OAGB), creates a small stomach pouch and joins it to a loop of small intestine, so that a defined length of intestine is bypassed. An anastomosis is a surgical join between two parts of the gut, and this operation has only one. How much intestine is bypassed is the surgeon's main lever, and Dr. Durkhure sets it according to how much weight the patient wants to lose, how severe the diabetes is, and what other comorbidities are present. Compared with the full gastric bypass, the pouch is larger, so the patient can eat and drink a little more comfortably.

SASI bypass

The SASI bypass, a sleeve gastrectomy with a single anastomosis sleeve-ileal bypass, combines a sleeve with a single connection to the ileum, the last part of the small intestine. Dr. Durkhure described it as an operation in which the target weight can effectively be designed, and as a metabolic operation in the full sense, because it controls the patient's diabetes.

Roux-en-Y gastric bypass

The full Roux-en-Y gastric bypass is the operation Dr. Durkhure reserves for the super-obese, with a BMI above 55 or 60. Below that range, his preference is the mini gastric bypass. For diabetic patients he also performs the bypass in Roux-en-Y fashion, and in selected cases an ileal interposition, in which a segment of ileum is moved higher in the intestine.

Weight regain after sleeve gastrectomy, and revision surgery

Weight regain after a sleeve gastrectomy, in Dr. Durkhure's account, stems from inadequate counselling, and the remedy is revision to another operation. In the live discussion after the masterclass, a doctor asked what the two-year recurrence on his sleeve gastrectomy slide meant. He explained that recurrence means regain of weight, and attributed it to not understanding the patient's food habits, work and daily life, and how much the patient walks or exercises.

Does the stomach change after a sleeve?

Asked whether the anatomy changes, he was precise. The stomach cannot return to its original form, but the sleeve starts to dilate. The remedy is revision: converting the sleeve into a mini gastric bypass, a SASI bypass, or another option, chosen according to the patient's habitus, or body build.

Can weight return if the patient follows the plan?

Asked whether weight can return in a patient who follows the recommended diet, exercise and lifestyle changes, he pointed to lifestyle: in his view, it is the decisive factor in whether weight returns after a sleeve.

Revision bariatric surgery

Dr. Durkhure also performs revision bariatric surgery for patients whose first operation has failed or who have regained weight. He stresses that revision begins with proper counselling and an assessment of the stomach before any decision on the second operation.

Metabolic surgery for type 2 diabetes: the role of C-peptide

Dr. Durkhure regards surgery as the most decisive of the three routes for treating type 2 diabetes, and he uses the C-peptide test to judge whether it will work. He frames the choice as oral tablets and insulin, injectable drugs such as Mounjaro or Ozempic, or surgery. In his own practice he has seen HbA1c, the measure of average blood sugar over the previous two to three months, fall from 12.5 to 5.5, with the patient off insulin, and he has seen insulin stopped within seven days of surgery. The indication is type 2 diabetes, not type 1.

C-peptide is released in equal amounts with insulin, so its level indicates how much insulin the patient's own pancreas can still produce. That reserve tells him whether the pancreas will be able to produce more insulin after metabolic surgery, and therefore whether surgery can realistically change the patient's diabetic status and make the patient euglycaemic, with blood sugar in the normal range.

Choosing the specific metabolic operation is, in his description, a calculation. He weighs the duration of the diabetes, how poorly controlled it is, the patient's general stability, and the patient's lifestyle. Everything, he said, matters.

Who qualifies for bariatric surgery, and who is on the team

Dr. Durkhure's selection criteria are deliberately broader than a BMI number:

• BMI is one criterion, not the only one.
• Prior effort: the patient must already have tried to lose weight.
• Motivation: the patient must be motivated.
• Age: the patient must fall within the department's age criteria.
• Psychological health: the patient must have no psychological problems.

The work is done by a team. Alongside the surgeon and the anaesthetist, his bariatric team includes a physiotherapist, a psychologist, an endocrinologist and a cardiologist, the last because excess weight can bring cardiac problems with it.

Hospital stay after bariatric surgery: one day, no ICU

The hospital stay after Dr. Durkhure's bariatric operations is one day, or two days at most in around 10 percent of cases. None of his bariatric patients, he said, goes to the intensive care unit. Part of his explanation is technical: before the patient leaves theatre, his team washes out the carbon dioxide, including from the fatty tissue, in theatre at the end of the operation.

He performs an on-table leak test and gives the patient the complete video, specifically including the leak test, so that the patient can see there was no leak at the end of the operation.

GLP-1 injections vs bariatric surgery: complement, not substitute

GLP-1 injections cannot replace bariatric surgery for severe obesity, in Dr. Durkhure's view, but they work for modest goals and alongside surgery. GLP-1 drugs mimic a gut hormone that reduces appetite. With drugs such as Mounjaro now approved for weight control, the moderator asked whether injections could replace bariatric surgery, and Dr. Durkhure's answer drew a clear line.

Injections must be taken every week, and they are not a permanent cure. They work well for modest goals: a patient of 100 kilograms aiming for 85, or of 125 kilograms aiming for 110, can use injections alone, without surgery. They cannot do the work of surgery for severe obesity. A patient with a BMI above 45 or 50 cannot reach a BMI of 25 on injections; a patient of 150 kilograms cannot become 75 kilograms by injections alone, and needs a permanent, anatomical treatment.

Surgery, in his framework, is for patients whose weight is too high, and for those with comorbidities such as sleep apnoea, knee joint problems, back pain or stress urinary incontinence. For them, bariatric surgery is the best option.

The two treatments also work in sequence. Dr. Durkhure prescribes the injections himself, and sometimes gives them for two or three months before surgery to improve the patient's condition so that the anaesthetist accepts the patient for the operation. His conclusion: the two go hand in hand, and one cannot replace the other.

The robotic platform, consultation model and other procedures Dr. Durkhure presented are summarised in the complete guide to robotic and laparoscopic surgery, and other surgeons in the field are listed under general and bariatric surgery.