부산대학교 도서관

Introduction: Premature coronary artery disease (CAD) incidence is increasing globally. South Asians (SA) have a disproportionately high burden of atherosclerotic cardiovascular disease (ASCVD). However, the effect of SA ethnicity on the risk of recurrent events in patients with premature CAD has not been prospectively evaluated.Methods: Patients in the SAVEBC and UK biobank (UKB) registries were enrolled and stratified by ethnicity and presence of premature CAD. The co-primary outcomes were to compare proportion of premature CAD and the incidence of recurrent ASVCD events. Secondary exploratory outcomes included describing demographic, physical, biochemical variables between cohorts.Results: 11,136 patients were included, 1,129 (143 SA; 21%) were from SAVEBC and 10,007 (400 SA; 4.0%) from UKB. There was a higher proportion of premature CAD in SA compared to Caucasians in UKB (5.2% vs. 2.0%, p < 0.001). Similarly, SA were overrepresented in SAVEBC (21% of cohort vs. 7.9% of British Columbia population). SA compared to Caucasians with premature CAD had increased prevalence of diabetes (SAVEBC: 20.1% vs 13.8%, p=0.08; UKB: 37.5% vs 18.0%, p<0.001), and lower mean HDL cholesterol (SAVEBC: 1.4±0.4 vs 1.5±0.4, p=0.21; UKB: 1.1±0.3 vs 1.2±0.3, p<0.001). SA had more diffuse disease reflected by more coronary segments affected (4.9±3.0 vs. 4.1±2.6, p=0.05), and a trend towards more affected coronary vessels compared to Caucasians (1.31±1.4 vs. 0.61±0.91, p=0.14). SA had greater incidence of recurrent ASCVD vs. Caucasians (4.19 vs. 3.08 events per 100 P-Y; incidence rate ratio p-value < 0.001). SA had higher risk of recurrent ASCVD events (HR 1.35, 95% CI 1.13,1.61, p<0.001). SA ethnicity remained a predictor of recurrent events on adjusted COX regression (HR 1.24, 95% CI 1.03,1.48, p=0.02).Conclusion: Using two prospective registries, SA had a higher proportion of premature CAD and recurrent cardiovascular events with shorter time to recurrent events. Some risk may be explained by adverse cardiometabolic profiles, however significant risk mechanisms are yet to be elucidated. Understanding the unique mechanisms of cardiovascular risk in SA is critical to appropriately identify high-risk individuals and initiate contemporary preventative therapies.