Impact of standard modifiable cardiovascular risk factors on 2-year all-cause mortality: Insights from an international cohort of 23,489 patients with acute coronary syndrome

Abstract

Controversial findings have been reported in the literature regarding the impact of the absence of standard modifiable cardiovascular risk factors (SMuRFs) on long-term mortality risk in patients with acute coronary syndrome (ACS). While the prognostic additive value of SMuRFs has been well described, the prognostic role of prior cardiovascular disease (CVD) by sex is less well-known in patients with and without SMuRFs. EPICOR and EPICOR Asia are prospective, observational registries conducted between 2010 and 2014, which enrolled ACS patients in 28 countries across Europe, Latin America, and Asia. Association between SMuRFs (diabetes, dyslipidaemia, hypertension, and smoking) and 2-year post-discharge mortality was evaluated using adjusted Cox models stratified by geographical region. Among 23,489 patients, the mean age was 60.9±11.9 years, 24.3% were women, 4582 (20.1%) presented without SMuRFs, and 16,055 (69.5%) without prior CVD. Patients with SMuRFs had a higher crude 2-year post-discharge mortality (HR 1.86; 95%CI, 1.56-2.22; p<0.001), compared to those without SMuRFs. After adjustment for potential confounding, the association between SMuRFs and 2-year mortality risk was substantially attenuated (HR 1.17, 95%CI 0.98-1.41; p=0.087), regardless of the type of ACS. The risk conferred by prior CVD was added to the underlying risk of SMuRFs to provide risk-specific phenotypes (e.g., women with SMuRFs and with prior CVD were at higher risk of dying than women without SMuRFs and without CVD; HR 1.67, 95%CI 1.34-2.06). In this large-scale international ACS cohort the absence of SMuRFs was not associated with a lower adjusted 2-year post-discharge mortality risk. Patients with both SMuRFs and prior CVD had a higher mortality irrespective of their sex.