• Fabrizio Rebecchi, Marco E Allaix, Elettra Ugliono, Claudio Giaccone, Mauro Toppino, and Mario Morino.
• General Surgery and Center for Minimal Invasive Surgery, Department of Surgical Sciences - University of Turin, corso A.M. Dogliotti, Turin, Italy.
• Ann. Surg. 2016 Nov 1; 264 (5): 871-877.

ObjectiveTo evaluate the long-term effects of laparoscopic Roux-en-Y Gastric Bypass (LRYGB) on gastroesophageal function.BackgroundLRYGB is considered the weight loss procedure of choice for obese patients with gastroesophageal reflux disease (GERD). However, long-term instrumental evaluations of GERD after LRYGB are not available.MethodsMorbidly obese patients selected for LRYGB were included in a prospective study. We performed clinical evaluation with GERD-HRQoL questionnaire, upper endoscopy, esophageal manometry, and 24-hour impedance pH (24-hour MII-pH) monitoring preoperatively and at 12 and 60 months after surgery. This trial is registered with ClinicalTrials.gov (no. NCT02618044).ResultsFrom May 2006 to May 2009, 86 patients entered the study and 72 (84%) completed the 5-year protocol. At preoperative 24-hour MII-pH monitoring, 54 patients (group A) had normal values, whereas 32 (group B) had diagnosis of GERD: 23 had acidic reflux, whereas 9 had combined reflux [acidic + weakly acidic reflux (WAR)]. The groups were similar in preoperative age, body mass index, and comorbidities. At 12 and 60 months, significant improvement in questionnaire scores was observed in group B patients. No manometric changes occurred in both groups; 24-hour MII-pH monitoring showed a significant reduction in acid exposure, but an increase of WAR in both group A (from 0% to 52% to 74%) and group B (from 35% to 42% to 77%). At long-term follow-up, esophagitis was found in 14 group A (30%) and in 18 group B patients (69%) (P < 0.001).ConclusionsLRYGB allows to obtain an effective GERD symptom amelioration and a reduction in acid exposure. However, 3 out 4 patients present with distal esophagus exposure to WAR.

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