Dual Antiplatelet Therapy Duration in Patients at High Bleeding Risk: A Systematic Review and Meta-Analysis.

Abstract (English)

IMPORTANCE: The optimal duration of dual antiplatelet therapy (DAPT) in patients at high bleeding risk (HBR) undergoing percutaneous coronary intervention (PCI) remains uncertain. OBJECTIVES: To evaluate the safety and efficacy of abbreviated DAPT durations in patients at HBR undergoing PCI. DATA SOURCES: PubMed, Embase, and Cochrane Central Register of Controlled Trials were searched from inception to October 26, 2025. STUDY SELECTION: Randomized clinical trials (RCTs) comparing abbreviated (ie, 1- to 3-month) vs standard (ie, 6- to 12-month) DAPT durations in patients at HBR without an indication for oral anticoagulation. DATA EXTRACTION AND SYNTHESIS: A pairwise meta-analysis was performed to compare abbreviated (ie, 1-month to 3-month) vs standard (ie, ≥6-month) DAPT durations. A frequentist network meta-analysis was performed to compare 1-month, 3-month, and standard DAPT. MAIN OUTCOMES AND MEASURES: The coprimary safety and efficacy end points were major or clinically relevant nonmajor bleeding (MCRB) and major adverse cardiovascular events (MACE; ie, a composite of cardiovascular death, myocardial infarction, or stroke). RESULTS: A total of 14 RCTs encompassing 11 398 patients at HBR (mean [range] age, 74.7 [68.6-80.0] years; 39.1% female and 60.9% male) were included. Compared with standard DAPT, abbreviated DAPT was associated with lower MCRB (risk ratio [RR], 0.71; 95% CI, 0.55-0.92; P = .009) and major bleeding (RR, 0.76; 95% CI, 0.59-0.99; P = .04). The risks of MACE (RR, 0.97; 95% CI, 0.81-1.16; P = .76) and its individual components did not differ between abbreviated and standard regimens. An increased risk of MACE was observed with 1-month vs 3-month DAPT in the single trial comparing these regimens, but the network estimate was nonsignificant (RR, 1.28; 95% CI, 0.96-1.72). CONCLUSIONS AND RELEVANCE: In this systematic review and meta-analysis, for patients at HBR undergoing PCI, abbreviated DAPT was associated with a lower risk of bleeding and, at least for 3-month regimens, was not associated with an increase in fatal or nonfatal ischemic cardiovascular or cerebrovascular events compared with standard 6- to 12-month DAPT.