Comparison of One Anastomisis Gastric Bypass and Duodeno-Jejunostomy for Treating SMA Syndrome

Participants will undergo One Anastomosis Gastric Bypass (OAGB), a laparoscopic bariatric procedure that creates a long narrow gastric pouch and anastomoses it to a loop of jejunum approximately 150-200 cm from the ligament of Treitz. This bypasses the compressed duodenum to relieve symptoms of SMAS while promoting weight gain or nutritional restoration in undernourished patients.

Participants will undergo Duodenojejunostomy (DJ), a standard surgical procedure to bypass the compressed segment of the duodenum. It involves creating an anastomosis between the duodenum and the jejunum distal to the point of compression, allowing normal food passage and relieving symptoms of Superior Mesenteric Artery Syndrome.