Cardiology AdvisorSudden Cardiac Death Risk Highest with Right Coronary Artery Stenosis

ℹ️ Observational Association Only Evidence

Coronary stenosis location as a distinct SCD risk determinant has received limited systematic study, with clinical attention historically weighted toward LAD and left main disease. This registry analysis examined 8.1-year follow-up data across 22,495 patients undergoing angiography for chronic coronary syndromes or ACS at a Finnish tertiary center.

Clinical Considerations

• RCA stenosis carried the highest adjusted SCD risk (HR 1.53; 95% CI, 1.31–1.80) across the full cohort, exceeding associations seen with LAD and left main stenosis after multivariate adjustment
• LCx stenosis showed a significant independent association with SCD (HR 1.34); proximal LCx location conferred greater risk than mid- or distal segments
• LAD and left main stenoses did not reach independent significance for SCD in the overall adjusted model, though left main stenosis carried the highest SCD risk among noninvasively managed patients
• 91.4% of SCDs among CAD patients occurred in individuals who did not receive revascularization beyond the initial 3-month post-angiography window

Practice Applications

• Recognize RCA stenosis as an underweighted SCD risk contributor in patients with chronic coronary syndromes managed without revascularization
• Interpret findings as hypothesis-generating; single-center Finnish registry data limits direct application to broader or more diverse patient populations
• Consider proximal LCx stenosis when stratifying residual SCD risk in medically managed patients alongside traditional risk factors
• Monitor for prospective data examining whether revascularization timing and vessel-specific strategy modify SCD outcomes in RCA-predominant disease