Revisional surgery for malnutrition after SADI-S: prevalence, indications, techniques and outcomes

SADIS with short common limb (< 250 cm) is a malabsorptive operation. Reoperation is advised in patients requiring admission for severe malnutrition. Elongation of the common channel is the preferred revisional technique Introduction: Single-Anastomosis Duodeno-Ileal bypass with Sleeve gastrectomy (SADI-S) is a modification of the duodenal switch. Initial common channel's length was 200, and after malnutrition was detected in some patients, it was elongated to 250 or 300 cm. The present study analyzes presentation and treatment of malnutrition after SADI-S.

Three hundred and thirty-three consecutive patients undergoing SADI-S between May 2007 and February 2019 were included. The common limb length was 200 cm in 50 cases, 250 cm in 211, 300 in 71 and 350 in 1. Thirty-one patients were admitted for severe hypoalbuminemia and 17 patients were submitted to revisional surgery, and constitute the series of our study. Mean weight before reoperation was 57 kg and mean body mass index (BMI) was 21 kg/m². Mean number of daily bowel movements was 5,6.

Mean time to reoperation was 56 months. The limb was found shorter than expected in 6 cases. Revisional surgery was conversion into a Roux en Y duodenal switch in 3 cases, elongation of the common limb in 11 patients, duodeno-duodenostomy in 1 and duodeno-jejunostomy to the first jejunal loop in 2. Mean weight regain was 14 kg, and mean final BMI 26 kg/m². Daily bowel movements were reduced to 1,3. Factors related to hypoalbuminemia were hypertension, poor-controlled diabetes, shorter common limb and liver-test alterations.

SADI-S is expected to be less malabsorptive than previous biliopancreatic diversions. However, caution must be taken with certain patients to avoid postoperative malnutrition. Adequate follow up with long-term supplementation is required.