Bariatric Surgery and Glucagon-Like Receptor-1 Agonists' Effects on Weight, HbA1c and Cardiovascular Outcomes: A Meta-Analysis
Introduction: Obesity is a highly prevalent chronic disease and is associated with high morbidity. Bariatric surgery is an effective, durable management. Glucagon-like receptor-1 agonists (GLP-1 agonists) showed high effectiveness in weight management with cardiac and renal benefits. Studies comparing bariatric surgery and GLP-1 agonists are scarce. This meta-analysis aimed to compare the effects of bariatric surgery and GLP-1 agonists on weight, HbA1c, major adverse cardiovascular events (MACE) and heart failure. Methods: We searched PubMed/, Google Scholar, Cochrane Library and Web of Science for relevant articles. We used the keywords bariatric surgery, sleeve gastrectomy, gastric bypass, gastric banding, GLP-1 agonists, twin-cretins, semaglutide, tirzepatide and liraglutide, MACE, acute coronary syndrome, fatal, myocardial infarction, stroke and non-fatal infarction. Out of the 1142 articles retrieved, 716 remained after duplication removal, 22 full texts were reviewed and 7 full texts were included in the final meta-analysis. Results: Bariatric surgery reduced the BMI more than GLP-1 agonists, Standard mean difference (SMD), -8.23, 95% CI, -11.02-5.45, with no differences regarding the HbA1c, MD, 0.08, 95% CI, -0.45-0.6. however, HbA1c was lower in bariatric surgery after eliminating heterogeneity, MD, -0.35, 95% CI, -0.37--0.32. The MACE was lower in bariatric surgery compared to GLP-1 agonists, odds ratio, 1.50, 95% CI, 1.13-1.98 (the result was similar after eliminating heterogeneity, odds ratio, 1.34, 95% CI, 1.15-1.56) and heart failure was lower in bariatric surgery compared to GLP-1 agonists, odds ratio, 1.87, 95% CI, 1.46-2.40. Conclusion: Bariatric surgery reduced weight, MACE and heart failure more than GLP-1 agonists, with similar effects on the glycated haemoglobin. Further larger clinical trials investigating the best GLP-1 and bariatric surgery in obesity and its comorbidities management.