Clinical Trial for Weight Regain Post-RYGB: APC Versus APC Plus Endoscopic Suture Technique

Obesity is a worldwide health and sociopolitical issue. Excessive body-weight currently affects over 50% of the Brazilian population and around 13% of all world population. It has been well established that obesity is an independent risk factor. Obese individuals are at increased risk of diseases and earlier death compared to those with normal weight and waist circumferences. The increased disease susceptibility of this subset of patients includes hypertension, stroke, hyperlipidemia, sleep apnea, Type 2 diabetes, neoplasms, GERD, and musculoskeletal disorders.

Obese patients and their physicians have increasingly turned to surgery to solve the excess weight issue and the frequent co-morbid conditions that impact their health and quality of life. Roux-en-Y Gastric Bypass (RYGB) and Laparoscopic Gastric Banding (LGB) comprise around 70% of all weight loss procedures performed every year. They induce significant and perennial weight loss and reduce or eliminate associated co-morbid diseases, including Type 2 diabetes. Despite improvements in postoperative morbidity and mortality rates over the years, (in part due to the use of a laparoscopic approach), these procedures still carry significant risk. Recent studies have shown mortality rates with RYGB as high as 1.9%, and complications associated with LGB as high as 13%. Nonetheless, a secondary bariatric procedure due to weight regain carries significant complication rates and worse outcomes, compared to the primary procedure. Consequently, less invasive techniques are needed to reduce such risks.

Gastric restriction is an important principle of both RYGB and LGB. The OverStitchTM Endoscopic Suturing System (Apollo Endosurgery, Inc. Austin, Texas) is an approved device designed to endoscopic placement of suture(s) and approximation of soft tissue. This system offers the assistant doctor the ability to restrict gastric pouch size by approximating tissue endoluminally through an incisionless (per-oral) approach. The use of this system has the potential to reduce the complications associated with the current surgical approach but still reaching the desired gastric restriction. The OverStitch has safely been used clinically for a great number of procedures that demanded an incisionless or minimally invasive approach, including endoluminal revisions for post-bypass gastric stoma and/or pouch dilatation, post-bypass fistulae repair, and oversewing of marginal ulcers.

Besides this suturing device, other endoscopic methods have already been used to reduce dilated stoma. Among them, ablation with argon plasma coagulation (APC) is one of the most important since this device is worldly available and presents an acceptable cost. Recent studies associate APC prior to endoscopic suture and initial evidence supports superiority of this association.

However, literature is still lacking of studies to support the use of APC associated with endoscopic suturing instead of APC alone. Therefore, the main focus of this study is to directly compare short and long-term effectiveness and safety of APC versus APC plus Endoscopic Full-thickness suture with OverStitch device in patients suffering from weight regain following RYGB.

Moreover, gut hormones regulation regarding bariatric and revisional procedures have been studied recently and evidence suggests that hormonal changes may be an important factor in weight loss. Three of the most important gut hormones regarding weight balance are ghrelin, GLP1 and peptide YY. Ghrelin is known as hunger hormone. It is produced by cells in gastric fundus. Glucagon-like Peptide 1 (GLP1) and Peptide YY (PYY) are both hormones that regulate satiety and are produced by L cells along distal intestine. Evidence in bariatric show that after long-term ghrelin levels diminish while GLP and PYY reach higher post-prandial peak. Regarding revisional endoscopic therapy, gut hormone changes have never been studied. That is also focus of this study as secondary outcome.