Abstract

Purpose
To evaluate the efficacy and safety of early aspirin discontinuation followed by P2Y12 inhibitor monotherapy versus standard dual antiplatelet therapy (DAPT) in patients with acute coronary syndrome (ACS) undergoing percutaneous coronary intervention (PCI).

Methods
This systematic review and meta-analysis followed PRISMA 2020 guidelines and a prespecified protocol registered in PROSPERO (CRD420261293472). MEDLINE, Embase, Scopus, and CENTRAL were searched through December 2025 for randomized controlled trials comparing early aspirin discontinuation (≤ 3 months) with standard DAPT in ACS patients undergoing PCI with drug-eluting stents. Two reviewers independently conducted study selection, data extraction, and risk of bias assessment (Cochrane RoB 2.0). Pooled risk ratios (RRs) with 95% confidence intervals (CIs) were estimated using a random-effects model.

Results
Seven trials including 20,501 patients (10,246 early discontinuation; 10,255 standard DAPT) were analyzed. Early aspirin discontinuation significantly reduced bleeding (RR, 0.46; 95% CI, 0.36–0.60; p < 0.001; I²=21.9%). There was no significant difference in major adverse cardiovascular events (RR, 0.98; 95% CI, 0.77–1.26) or in myocardial infarction, stroke, repeat revascularization, or all-cause mortality. However, early aspirin discontinuation was associated with an increased risk of stent thrombosis (RR, 1.72; 95% CI, 1.07–2.78). In trials with aspirin discontinuation within 1 month, bleeding reduction remained substantial, with numerically higher but nonsignificant ischemic outcomes.

Conclusion
In ACS patients undergoing PCI, early aspirin discontinuation reduces bleeding without a statistically significant increase in overall ischemic events; however, a significant increase in stent thrombosis was observed. These results support individualized decision-making, particularly favoring patients at high bleeding risk and low thrombotic risk treated with potent P2Y12 inhibitors. Further adequately powered studies focused on rare ischemic outcomes, including stent thrombosis, are warranted.