Abstract
INTRODUCTION: Roux-en-Y gastric bypass (RYGB) is one of the most commonly performed bariatric operations worldwide. Leaks following RYGB are rare, but the consequences can be devastating. Although most leaks occur at the gastrojejunostomy (GJ) anastomosis, there is a lack of data on modifiable technical factors that can reduce the risk of leaks. Therefore, we evaluated whether the leak pressure of a GJ linear stapled anastomosis is dependent on the closure technique. METHODS: Two expert surgeons constructed gastric pouches and GJ anastomoses on ex vivo porcine models in a laparoscopic simulator using 30-mm and 45-mm endoscopic staplers. The GJ anastomosis was closed using either a single layer suture, double layer suture or stapler. The endpoints were leak pressure to air insufflation, measured by two independent observers, site of leak and internal circumference of the GJ anastomosis. RESULTS: In total, 30 GJ anastomoses were constructed (30 mm, n = 15; 45 mm, n = 15). The GJ anastomosis was closed using single layer (n = 9), double layer (n = 9) and stapled techniques (n = 12). Inter-observer agreement was high. Stapled and double layer closures were more resilient than a single layer closure, with 75% (9/12) stapled closures remaining intact at < 70 mmHg. GJ stoma circumference was lower using a 30-mm stapler (64.8 mm vs 80.2 mm; p < 0.05) but independent of closure technique. The most common leak site was the corner of the closure (67%). CONCLUSION: In summary, the GJ anastomosis closure technique may be a modifiable factor to prevent anastomotic leak.