Band slippage/pouch dilatation

Obstruction of the stomach-band outlet 

Esophageal dilatation or poor esophageal function

Leak or twist at the access port. 

Band erosion into the stomach

Port displacement, port site pain

Re-operation to fix a problem with the band or initial surgery

Reasons for revision of a Gastric Bypass may include:

Leaks

Bleeding

Hernias

Obstruction

Stricture