The Impact of the Length of the Common Intestinal Loop on Metabolic and Nutritional Outcomes of Patients with Severe Obesity Who Undergo of Single Anastomosis Duodeno-Ileal Bypass with Sleeve Gastrectomy: 5-Year Follow-Up.

Introduction: Single-anastomosis duodeno-ileal bypass with sleeve gastrectomy (SADI-S) is a recent bariatric surgery technique, highly effective in terms of weight loss. Nevertheless, data regarding the impact of SADI-S at mid-long term (after >5 years of follow-up) are scarce. Objectives: To evaluate the effect of lengths of common intestinal loop on the evolution of patients with morbid obesity (MO), who undergo SADI-S. Materials and Methods: Descriptive study (case series), including patients with MO who underwent SADI-S procedure between January 2012 and December 2015 with at least 5 years of follow-up. Patients were classified as "Old-SADI-S" (OS) when length of the common alimentary loop was <2.5 m and "New-SADI-S" (NS) when length was >2.5 m. Clinical parameters and nutritional parameters were included. Results: Twenty-nine cases were included (17 OS; 12 NS), 86.2% women and mean age 46.7 ± 1 years. After 12 months, OS had significantly lower body mass index (29.7 ± 4.8 kg/m2 versus 32.0 ± 5.1 kg/m2, P = .01), without significant differences in the resolution of comorbidities. Nevertheless, OS group had severe malabsorptive complications requiring surgical conversion of OS to NS in 7 patients after 8 months. At 5 years of follow-up, no significant difference was seen between the two groups and resolution of comorbidities was maintained during this period of time. Conclusions: SADI-S is effective in terms of weight loss and resolution of comorbidities at 5 years of follow-up, regardless of the length of the common intestinal loop. However, a common intestinal loop <2.5 m was associated with severe malabsorptive complications that determined the surgical re-conversion in all cases.