It is called conversion surgery when the patient has previously undergone a surgical procedure to lose weight but has not obtained the necessary result and wishes to switch to another procedure to obtain better ones. Also if the current surgery shows some complication that makes it imperative to convert the type of surgery.

The failure rate is small, if the patient is well studied, the type of operation well chosen and the patient follows the recommendations given by the medical team.

In this type of surgery, medical, endoscopic, psychological and nutritional evaluations must be carried out to give an accurate diagnosis of which surgery is most appropriate for the case and  reduce surgical risks.