Efficacy and Safety of Colchicine in Post-acute Myocardial Infarction Patients: A Systematic Review and Meta-Analysis of Randomized Controlled Trials

Background: Inflammation plays a key role in atherosclerotic plaque destabilization and adverse cardiac remodeling. Recent evidence has shown a promising role of colchicine in patients with coronary artery disease. We evaluated the efficacy and safety of colchicine in post-acute myocardial infarction (MI) patients. Methods: We searched five electronic databases from inception to January 18, 2021, for randomized controlled trials (RCTs) evaluating colchicine in post-acute MI patients. Primary outcomes were cardiovascular mortality and recurrent Ml. Secondary outcomes were all-cause mortality, stroke, urgent coronary revascularization, levels of follow-up high-sensitivity C-reactive protein (hs-CRP), and drug-related adverse events. All meta-analyses used inverse-variance random-effects models. Results: Six RCTs involving 6,005 patients were included. Colchicine did not significantly reduce cardiovascular mortality [risk ratio (RR), 0.91; 95% confidence interval (95% CI), 0.52-1.61; p = 0.64], recurrent MI (RR, 0.87; 95% CI, 0.62-1.22; p = 0.28), all-cause mortality (RR, 1.06; 95% CI, 0.61-1.85; p = 0.78), stroke (RR, 0.28; 95% CI, 0.07-1.09; p = 0.05), urgent coronary revascularization (RR, 0.46; 95% CI, 0.02-8.89; p = 0.19), or decreased levels of follow-up hs-CRP (mean difference, -1.95 mg/L; 95% CI, -12.88 to 8.98; p = 0.61) compared to the control group. There was no increase in any adverse events (RR, 0.97; 95% CI, 0.89-1.07; p = 0.34) or gastrointestinal adverse events (RR, 2.49; 95% CI, 0.48-12.99; p = 0.20). Subgroup analyses by colchicine dose (0.5 vs. 1 mg/day), time of follow-up (<1 vs. >= 1 year), and treatment duration (<= 30 vs. >30 days) showed no changes in the overall findings. Conclusion: In post-acute MI patients, colchicine does not reduce cardiovascular or all-cause mortality, recurrent MI, or other cardiovascular outcomes. Also, colchicine did not increase drug-related adverse events.