Short term outcome following acute phase switch among P2Y inhibitors in patients presenting with acute coronary syndrome treated with PCI: A systematic review and meta-analysis including 22,500 patients from 14 studies.

Introduction: The efficacy and safety of switching P2Y receptor antagonists in patients admitted for acute coronary syndrome (ACS) remain unclear. We assessed the short-term clinical outcomes (in-hospital and within 30 days) of switching P2Y inhibitor (P2YI) drugs versus maintaining the same regimen by performing a comprehensive review and meta-analysis of available data.

Methods: MEDLINE/PubMed/SCOPUS/Cochrane databases were screened for studies regarding switching of P2YI in patients with ACS that reported 30 days follow-up. Major cardiac events (MACE) and bleeding were compared between patients who were switched/not switched.

Results: 22,500 patients from 14 studies were included. Unstable angina/non-ST elevation myocardial infarction (62.0%, interquartile range, 52.8%-68.0%) was the most common clinical presentation. The total number switched was 4294 (19.1%); escalation in 3416 (79.5%) patients (from clopidogrel to prasugrel, 62.9%) and de-escalation in 18.5%. Pooled analysis revealed no significant differences in MACE for any comparison; risk of bleeding was significantly increased among switched patients overall (odds ratio [OR], 1.60; 95% confidence interval [CI] 1.22-2.10) and increased in the escalation group (OR, 1.51; 95% CI, 1.06-2.16).

Conclusions: Among patients presenting with ACS, switching from one P2YI agent to another in the acute phase seems associated with a short-term increased risk of bleeding. Accurate upfront selection and prescription of a P2YI based on ischemic and bleeding risks is paramount to avoid adverse events switching-related during hospitalization and in the first 30 days.