Single-anastomosis Duodeno Ileal Bypass (SADI) Versus Roux-en-Y Gastric Bypass

Obesity is a major public health problem worldwide. Bariatric surgery has proved to be the most effective treatment of morbid obesity in terms of weight reduction and remission of co-morbid conditions during long-term follow-up. Nowadays, France is ranked 3rd in terms of bariatric surgeries performed per year.

Since the laparoscopic Roux-en-Y gastric bypass (RYGB) was described in 1977, this restrictive and malabsorptive procedure has become a gold standard for morbid obesity with an average Excess Weight Loss % (EWL%) of 72% at 2 years, and a strong metabolic effect, especially with regard to type 2 diabetes remission. Nevertheless, failures are observed (up to 20%), particularly in super obese patients, which are then difficult to manage. In this population, biliopancreatic diversion with duodenal switch (BPD-DS) is indicated due to its stronger weight loss and metabolic effect, but is still little performed worldwide because of its higher morbidity, surgical complexity and risk of malnutrition.

A novel technique combining the physiological advantages of pylorus preservation and the technical benefits of single-loop reconstruction was introduced in 2007 by Sanchez-Pernaute, who described the single-anastomosis duodeno-ileal bypass with sleeve gastrectomy (SADI-S) as an evolution of the BPD-DS. With a 2.5-meter common channel, SADI-S seems to offer good results for the treatment of both morbid obesity and its metabolic complications, with an EWL% of up to 95% at 2 years and potentially less nutritional consequences.

To date, there is only one Spanish randomized trial comparing SADI-S to BPD-DS, whereas BPD-DS represents less than 1% of bariatric procedures in France and is only allowed in super obese patients. Thus only preliminary data of poor scientific value exists. Nevertheless, facing very encouraging short-term outcomes, there is a real need for a prospective trial comparing SADI-S to a standard bariatric procedure.

The aim of the investigator's study is to assess weight loss efficiency and the morbi-mortality of the SADI-S in comparison to a standard (RYGB), in order to validate this procedure among bariatric techniques

HYPOTHESIS SADI-S is superior to the standard RYGB for weight loss, increasing the EWL% by 10% (82% vs 72%, respectively) at 2 years.


Eligibility Criteria:
Inclusion Criteria:

* Patient aged between 18 and 65 years old,
* Morbid obesity with BMI ≥40 kg/m2 or BMI ≥35 kg/m2 associated with one co-morbidity which will be improved by surgery (high blood pressure, type 2 diabetes mellitus, obstructive sleep apnea, dyslipidemia, arthrosis)
* Patient who has benefited from an upper GI endoscopy with biopsies to look for Helicobacter pylori , within the 12 months before surgery,
* Patient who has benefited from a pluridisciplinary evaluation, with a favorable opinion for SADI-S or RYGB as a primary surgery or after failure of sleeve gastrectomy (defined as insufficient weight loss at 18 months after surgery (EWL% \<50), or as weight regain (+ 20%)).
* Patient who understands and accepts the need for a long term follow-up,
* Patient who agrees to be included in the study and who signs the informed consent form,
* Patient affiliated with a healthcare insurance plan.

Exclusion Criteria:

* History of previous bariatric surgery, other than a sleeve gastrectomy,
* Presence of a severe and evolutive life threatening pathology, unrelated to obesity,
* History of type 1 diabete,
* History of chronic inflammatory bowel disease,
* Pregnancy or desire to be pregnant during the study,
* Presence of Helicobacter pylori resistant to medical treatment,
* Presence of a unhealed gastro-duodenal ulcer or diagnosed less than 2 months previously,
* Mentally unbalanced patients, under supervision or guardianship,
* Patient who does not understand French/ is unable to give consent,
* Patient not affiliated to a French or European healthcare insurance,
* Patient who has already been included in a trial which has a conflict of interests with the present study