Sex differences in the outcome after percutaneous coronary intervention – A propensity matching analysis

Background: Whether there are sex differences in the outcome of patients with coronary artery disease (CAD) undergoing percutaneous coronary intervention (PCI) remains controversial. We undertook this study to assess whether there are sex-related differences in the long-term mortality in a large series of patients with CAD after PCI. Methods: The study included 18,334 patients (4735 women and 13,599 men) with CAD treated with PCI. Propensity matching was performed to obtain a group of patients (3000 women and 3000 men) matched for all characteristics available in database. The primary outcome was a composite of cardiac mortality, myocardial infarction or stroke at 3 years of follow-up. Results: The primary outcome occurred in 660 women and 1440 men (Kaplan-Meier [KM] estimates, 15.2% in women and 11.6% in men, unadjusted hazard ratio [HR] = 1.35, 95% confidence interval [CI] 1.24 to 1.49; P < 0.001). Women were at higher risk of all-cause mortality (15.4% vs. 12.3%; P < 0.001), cardiac mortality (10.2% vs. 7.6%; P < 0.001) and stroke (2.6% vs. 1.4%; P < 0.001) than men. In matched patients, the primary outcome occurred in 371 women and 322 men (KM estimates, 13.4% vs. 11.6%, HR = 1.18 [1.01–1.36], P = 0.033). Women were at higher risk of myocardial infarction (4.2% vs. 3.1%; P = 0.044) but not cardiac (8.7% vs. 8.2%; P = 0.306) or all-cause death (12.5% vs. 12.9%; P = 0.991) or stroke (1.9% vs. 1.6%; P = 0.550) than men. Conclusions: After propensity matching, women remained at a higher risk of a composite of cardiac mortality, myocardial infarction or stroke up to 3 years after PCI than men.