Introduction: Genetic obesity susceptibility in postoperative bariatric surgery weight regain (PBSWR) remains largely unexplored.
Methods: A retrospective case series of adult (N = 27) PBSWR patients who had undergone genetic obesity testing was conducted between Sept. 2020 and March 2022.
Primary outcome: frequency of genetic variants in patients experiencing weight regain following bariatric surgery.
Secondary outcomes: prevalence of obesity-related comorbidities, nadir BMI achieved post-bariatric surgery, and percent total body weight loss (%TBWL) achieved with obesity pharmacotherapies.
Results: Heterozygous mutations were identified in 22 (81%) patients, with the most prevalent mutations occurring in CEP290, RPGR1P1L, and LEPR genes (3 patients each). Median age was 56 years (interquartile range (IQR) 46.8-65.5), 88% female. Types of surgery were 67% RYGB, 19% SG, 4% gastric band, and 13% revisions. Median nadir BMI postoperatively was 34.0 kg/m2 (IQR 29.0-38.5). A high prevalence of metabolic derangements was noted; patients presented median 80 months (IQR 39-168.5) postoperative for medical weight management with 40% weight regain. BMI at initiation of anti-obesity medication (AOMs) was 41.7 kg/m2 (36.8-44.4). All received AOM and required at least 3 AOMs for weight regain. Semaglutide (N = 21), topiramate (N = 14), and metformin (N = 12) were most prescribed. Median %TBWL for the cohort at the first, second, and third visit was 1.7, 5.0, and 6.5 respectively. Fourteen (52%) achieved 5%TBWL, 10 (37%) achieved 10%TBWL, and 4 (15%) achieved 15%TBWL with combination AOMs and supervised medical intervention.
Conclusion: An unusually high prevalence of genetic obesity variants in PBSWR was found, warranting further research.
Keywords: Bariatric surgery weight regain; Genetic obesity; Genetic obesity variants; Medical weight management; Recidivism; Weight loss pharmacotherapy.
© 2023. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.