Effect of Incretin-Based Therapies on Blood Pressure: A Systematic Review and Meta-Analysis.

AIMS: Hypertension and obesity frequently coexist and synergistically increase cardiovascular (CV) risk. Incretin-based therapies with glucagon-like peptide-1 receptor agonists (GLP-1-RAs), gastric inhibitory polypeptide (GIP)/GLP1-RAs, and glucagon/GIP/GLP-1RAs lead to substantial weight loss. However, their antihypertensive efficacy and safety profile have not been comprehensively quantified. Our study aimed to evaluate the effects of incretin-based therapies on office systolic blood pressure (BP) (SBP), diastolic BP (DBP), all-cause mortality, and key safety outcomes, i.e. hypoglycaemia and pancreatitis episodes, in adults with overweight or obesity. METHODS AND RESULTS: We searched PubMed, EMBASE, and ClinicalTrial.gov from inception to 30 April 2024 for randomized controlled trials (RCTs) comparing incretin-based therapy with placebo and ≥1 month of follow-up. The primary outcome was change in SBP; secondary outcomes were change in DBP, all-cause mortality, hypoglycaemia, and pancreatitis. Random effects meta-analyses generated mean differences (MDs) or risk ratios (RRs) along with 95% confidence intervals (CIs). Heterogeneity was explored with I2 statistics, subgroup analyses, and meta-regression. Eighty-five RCTs encompassing 90 977 participants (median follow-up time 8 months) met the eligibility criteria. GLP1-RAs reduced SBP by 3.4 mmHg (95% CI 2.8-4.0) and DBP by 0.9 mmHg (95% CI 0.5-1.2). A higher weight loss was significantly associated with a greater reduction in BP. The most significant BP reduction was associated with dual (SBP 5.1 mmHg; DBP 1.8 mmHg) and triple (SBP 6.6 mmHg; DBP 2.1 mmHg) receptor agonists. All-cause mortality was reduced by 18% (RR 0.82, 95% CI 0.76-0.90). Incretin-based therapy did not increase the risk of hypoglycaemia (RR 1.05, 95% CI 0.83-1.33) or pancreatitis (RR 0.84, 95% CI 0.61-1.15). CONCLUSION: Incretin-based therapy led to a modest but clinically meaningful BP reduction and lower all-cause mortality in adults with overweight or obesity, without excess in hypoglycaemia or pancreatitis episodes. There was a significant association between weight loss and the reduction in SBP and DBP. Dual and triple agonists exhibited the most pronounced antihypertensive effect. These findings support the use of incretin-based therapies as part of an integrated and multidisciplinary approach to managing obesity and hypertension, with multiple agonists showing particular promise. Our findings also underscore the need for long-term RCTs to clarify weight-independent mechanisms and the durability effect of BP reduction.