The Impact of SYNTAX Score of Non-Infarct-Related Artery on Long- Term Outcome among Patients with Acute ST Segment Elevation Myocardial Infarction Undergoing Primary Percutaneous Coronary Intervention

OBJECTIVE We investigated the impact of the severity of stenosis in a non-infarct-related artery (IRA) on the long-term prognosis of patients with ST-segment elevation myocardial infarction (STEMI) undergoing primary percutaneous coronary intervention (PCI). METHODS Three hundred one consecutive patients (age: 59.7 ± 13.2 years, 85.5% men) underwent primary PCI during 2009-2012. Receiver operating characteristic curve analysis found the optimal cutoff for non-IRA SYNTAX score (SS) to be 2.5. We divided the patients into two groups according to this cutoff value. RESULTS By multivariable analysis, non-IRA SS (≥ 2.5) was an independent predictor of major adverse cardiac events (hazard ratio [HR]: 2.15, 95% confidence interval [CI]: 1.21-3.79, P  =  0.008) and all-cause mortality (HR: 3.49, 95% CI: 1.13-10.8, P  =  0.03). However, the prediction of cardiovascular mortality had only borderline significance (HR: 3.29, 95% CI: 0.90-12.08, P  =  0.07). CONCLUSION STEMI patients treated with primary PCI and moderate to severe non-IRA stenosis (SS ≥ 2.5) have more subsequent cardiac events. Those populations should be treated with more aggressive preventive and medical management.