Bariatric Surgery in Patients with Obesity and Ventricular Assist Devices Considered for Heart Transplantation: Systematic Review and Individual Participant Data Meta-analysis

Background: Class II obesity (body mass index BMI >= 35 kg/m(2)) is a contraindication to heart transplantation (HT). Although few single-center studies (case reports/series and small cohorts) have reported promising outcomes of bariatric surgery (BS) in patients with obesity and ventricular assist devices, low sample sizes have made their analysis and interpretation challenging. Methods and Results: We conducted a systematic search in ClinicalTrials.gov, Cochrane, Embase, PubMed, Google Scholar, and most relevant bariatric and heart failure journals. We extracted baseline and outcome individual participant data for every ventricular assist device patient undergoing BS with reported postoperative BMI and their respective timepoints when BMI data were measured. Fourteen references with 29 patients were included. The mean age was 41.9 +/- 12.2 years, 82.8% underwent laparoscopic sleeve gastrectomy, and 39.3% had reported perioperative adverse events. The mean pre-BS BMI was 45.5 +/- 6.6 kg/m(2) and decreased significantly during follow-up (rho -0.671; P < .00001). Among 23 patients with documented listing status, 78.3% were listed for HT. Thirteen of 28 patients (46.4%) underwent HT at 14.4 +/- 7.0 months. There were no reported deaths for the HT-free 1-year period. Median follow-up was 24 months (interquartile range, 12-30 months). Twenty-two of 28 patients (78.6%) achieved the composite outcome (BMI of < 35 kg/m(2)/HT/listing for HT/myocardial recovery) at 11 months (interquartile range, 3-17 months). Patients with a BMI < 45 kg/m(2) had a higher chance of achieving the composite outcome (P < .003). Conclusions: BS may help patients with obesity and ventricular assist devices to lose a significant amount of weight and improve their candidacy for HT or even achieve myocardial recovery.