Impact of completeness of revascularization by coronary intervention on exercise capacity early after acute ST-elevation myocardial infarction.

Background The importance of achieving complete revascularization by percutaneous coronary intervention (PCI) in patients with acute myocardial infarction (MI) remains unclear. Objective To compare short-term exercise capacity following acute ST-elevation myocardial infarction (STEMI), in patients receiving PCI with stenting, between those completely revascularized (CR) and those incompletely revascularized (IR). Methods We retrospectively reviewed 326 patients [single-vessel disease (SVD) group, 118 patients; CR group, 112 patients; IR group, 96 patients] who underwent cardiopulmonary exercise testing 7-30 days after STEMI to measure peak oxygen uptake (VO2peak), oxygen uptake at anaerobic threshold (VO2AT), and peak oxygen pulse. Demographic data, presence of concomitant diseases, STEMI characteristics, and echocardiography and angiography findings were evaluated. Results Most patients were male (89.0%) and mean age was 55.6 ± 11.2 years. Ischemic ST deviation occurred in 7.1%, with no significant difference between groups. VO2peak and VO2AT did not differ significantly between groups, despite a trend to be lower in the CR and IR groups compared with the SVD group. Peak oxygen pulse was significantly higher in the SVD group than in the IR group (p = 0.005). After adjustment for age, gender, body mass index, cardiovascular risk factors, MI characteristics and echocardiography parameters, CR was not an independent predictor of VO2peak (OR = -0.123, 95% confidence interval [CI] -2.986 to 0.232, p = 0.093), VO2AT (OR = 0.002, 95%CI 1.735 to 1.773, p = 0.983), or peak oxygen pulse (OR = -0.102, 95%CI -1.435 to 0.105, p = 0.090). Conclusion CR in patients treated with PCI for multivessel disease might show no benefit on short-term exercise tolerance over IR. [ABSTRACT FROM AUTHOR]