Long-term Follow-up After OAGB

This study is designed to learn more about changes in the digestive system after one-anastomosis gastric bypass (OAGB), a widely used weight-loss operation. While this surgery is effective for reducing excess weight and improving obesity-related health problems, some people may develop changes in the stomach or esophagus over time, such as bile reflux (backflow of bile into the stomach or esophagus) or marginal ulcers (sores at the site where the stomach is joined to the small intestine). To better understand how often these problems occur, and whether they cause symptoms, the study follows patients for at least 5 years after surgery. All participants have an upper endoscopy (a camera test that looks at the esophagus, stomach, and the join with the small intestine) before surgery, and then again 1, 3, and 5 years afterwards. These check-ups are done even if the patient feels well, to detect any hidden changes early. The study also compares what patients report in symptom questionnaires-covering issues like heartburn, regurgitation, or stomach discomfort-with what is actually seen during endoscopy. This will help doctors understand how well symptoms match the real condition of the digestive tract. By using the same protocol across several specialized bariatric centers, and including all eligible patients, the study aims to provide reliable, long-term data to guide follow-up care after OAGB. The findings could help refine patient monitoring, improve early detection of problems, and identify risk factors that can be addressed to prevent complications.