Deadly association of cardiogenic shock and chronic total occlusion in acute ST-elevation myocardial infarction

Background The association between cardiogenic shock and 1 or >1 chronic total occlusion (CTO) in unselected patients presenting with ST-elevation myocardial infarction (MI) (STEMI) has not been characterized. Methods Patients with STEMI referred with or without cardiogenic shock were categorized into no CTO, 1 CTO, and >1 CTO. The primary end point was the 30-day mortality. Results Between 2006 and 2011, 2,020 consecutive patients were included. A total of 141 patients (7%) presented with cardiogenic shock on admission. The prevalence of 1 CTO and >1 CTO in a non–infarct-related artery was 23% and 5%, respectively, among patients with shock compared with 6% and 0.5% in patients without shock ( P < .0001). Independent predictors of cardiogenic shock included left main–related MI (odds ratio [OR] 6.55, 95% CI 1.39-26.82, P = .019), CTO (OR 4.20, 95% CI 2.64-6.57, P < .001), creatinine clearance 1 CTO, 65.6% with 1 CTO, and 40.2% in patients without CTO ( P < .0001). After adjustment for left ventricular ejection fraction and renal function, CTO remained an independent predictor for 30-day mortality (hazard ratio [HR] 1.83; 95% CI 1.10-3.01, P = .02). Conclusion In patients with STEMI, CTO was strongly associated with cardiogenic shock on admission. In this setting, mortality was substantially higher in patients with 1 CTO and exceedingly high in those with >1 CTO. The presence of CTO was an independent predictor of early mortality.