Liver transplantation and bariatric surgery: a new surgical reality: a systematic review of the best time for bariatric surgery.

Non-alcoholic fatty liver disease has increased in parallel with the obesity. This situation represents a new reality for patients with an indication for liver transplant (LT) and bariatric surgery (BS). We undertook a systematic review of BS and LT using the terms 'liver transplant', 'obesity' and 'bariatric surgery'. The variables analyzed were number of patients, technique and timing of BS, surgical complications, follow-up and mortality. A total of 190 papers were identified and, 28 articles were discussed (6 papers with BS before a LT, 6 with both procedures simultaneously and 16 studies with BS after a LT). In the last 7 years, 22 of the 28 papers (78.6%) were published on this subject. A total of 144 patients had both procedures: 27 (18.8%) before, 42 (29.1%) simultaneously and 75 (52.1%) after. Sleeve gastrectomy was the most performed BS (121 cases-84%) followed by a Roux-en-Y gastric bypass (20 cases-13.9%). The number of publications has increased substantially in recent years. The majority papers of BS after LT could be explained because of commodity of the flow of these patients. The best moment to perform BS in these patients has yet to be established.