Incidence of symptomatic gallstones after bariatric surgery: the impact of expectant management

Abstract

Background: Bariatric surgery is the most effective treatment for sustained weight reduction and for obesity-related comorbidities. The development of gallstones, as a result of rapid weight loss, is a well-known consequence of bariatric procedures. It remains unclear, however, if there is an increased risk of these gallstones becoming symptomatic. Aim and methods: A retrospective analysis of 505 consecutive patients submitted to either Roux-en-Y Gastric Bypass or Sleeve Gastrectomy, between January and December 2019, was performed. The aim of our study was to determine the incidence of symptomatic cholelithiasis after bariatric surgery and to identify potential risk factors for its development. Results: Of the 505 patients included, 79 (15.6%) underwent either previous cholecystectomy (n = 67, 84.8%) or concomitant cholecystectomy during bariatric surgery (n = 12, 15.2%). Among the remaining 426 (84.4%) patients, only 8 (1.9%) became symptomatic during the 12-month follow-up. When compared with patients who remained asymptomatic, they had a higher median preoperative BMI (47.0 vs. 42.8, p = 0.046) and prevalence of cholelithiasis on preoperative ultrasound (62.5% vs. 10.7%, p = 0.001). Multivariate analysis revealed preoperative BMI and cholelithiasis on preoperative ultrasound as independent factors for symptomatic biliary disease (OR 1.187, 95%CI 1.025-1.376, p = 0.022 and OR 10.720, 95%CI 1.613 - 71.246, p = 0.014, respectively). Conclusion: Considering a low incidence of symptomatic gallstones after bariatric surgery, concomitant cholecystectomy should only be performed in symptomatic patients undergoing bariatric surgery. Preoperative factors, such as a higher BMI and positive ultrasound for cholelithiasis, may be related to the development of symptomatic gallstones, but further studies are needed for better stratification of risk.