Among patients who have undergone percutaneous coronary intervention (PCI), the use of dual antiplatelet therapy (DAPT) is associated with increased risk of bleeding, but decreased stent thrombosis and myocardial infarction unrelated to the stent. As PCI techniques and devices have progressed, the optimal duration of DAPT has come into question. We identified all randomized controlled trials (RCTs) of patients undergoing PCI, who received one or more drug eluting stents (DES) for stable coronary artery disease (CAD) or acute coronary syndrome (ACS), and randomized to short (1-3 months) versus standard duration DAPT. The prespecified primary outcome was major adverse cardiovascular events (MACE). Important secondary outcomes were net adverse clinical events (NACE) defined as MACE and major bleeding; any bleeding; major bleeding; all-cause death; cardiovascular death. We calculated hazard ratios (HR) and 95% confidence intervals (CI) using random-effects model. Analysis included 7 RCTs, comprising 35,857 patients and 53,321 patient-years of follow-up. The mean (SD) age of patients was 64.4 (10.6) years, 49.6% of patients presented with ACS, and 25.5% were female. There was no difference between short and standard-length DAPT in regards to MACE (HR = 0.93; 95% CI 0.84-1.03; p = 0.19), NACE (HR = 0.93; 95% CI 0.85-1.02; p = 0.12), all-cause death (HR = 0.92; 95% CI 0.80-1.05; p = 0.21), or cardiovascular death (HR = 0.85; 95% CI 0.64-1.13; p = 0.26). However, short-term DAPT was associated with significantly reduced major bleeding events (HR = 0.67; 95% CI 0.47-0.95; p = 0.03) and any bleeding event (HR = 0.63; 95% CI 0.44-0.90; p = 0.01) compared with standard-length DAPT. Among patients undergoing PCI for CAD, the use of short-term DAPT (1-3 months) followed by single antiplatelet therapy was associated with a lower incidence of clinically relevant bleeding events, but with similar risk of MACE, all-cause death, and cardiovascular death compared with standard duration DAPT.
Keywords: ACS; Antiplatelet monotherapy; Meta-analysis; PCI; Short DAPT.