Roux en Y (RNY) or gastric bypass is a restrictive procedure that staples off an approximate 5-35cc stomach pouch at the upper portion of the stomach. A section of small bowel is then attached to the pouch via a small opening. Narrowing and or blockages can take place at this small opening.
Ulceration can also happen at the area where the small bowel and the stomach tissue are attached. Due to the small pouch size vomiting can take place if food is not properly chewed or food is eaten too fast or in too large a volume.
Dumping syndrome also takes place when consuming high sugar food.
When the opening in between the pouch and the small bowel is stretched patient begins to regain weight. This generally occurs approximately 2 years after surgery.