Background:: Cardiogenic shock remained the leading cause of death in ST-segment elevation acute myocardial infarction (STEMI) patients even in the primary percutaneous coronary intervention era.
Methods:: Among 3942 STEMI patients with primary percutaneous coronary intervention within 24 h after symptom-onset in the Coronary Revascularization Demonstrating Outcome Study in Kyoto acute myocardial infarction registry, the study population of the current analysis consisted of 466 STEMI patients who were complicated by cardiogenic shock due to acute pump failure.
Results:: The cumulative incidence of all-cause death of cardiogenic shock due to acute pump failure was 25.4% at 30 days, 38.7% at one year, and 51.4% at five years. Cumulative five-year incidence of all-cause death in patients with left main coronary artery culprit lesion was extremely high (left main coronary artery: 70.4%, left anterior descending artery: 52.5%, left circumflex artery: 50.6%, and right coronary artery; 44.3%, respectively, log-rank p<0.001). The cumulative five-year incidence of all-cause death in patients with onset-to-balloon time ⩽3 h as well as those with door-to-balloon time ⩽90 min were significantly lower than those without (43.3% versus 55.5%, log-rank p=0.008, and 44.9% versus 55.8%, log-rank p=0.003, respectively). After adjusting for confounders, onset-to-balloon time ⩽3 h and door-to-balloon time ⩽90 min were independently associated with lower long-term risk for all-cause death (hazard ratio: 0.69, 95% confidence interval: 0.49-0.96, p=0.03, and hazard ratio: 0.73, 95% confidence interval: 0.53-0.98, p=0.04, respectively).
Conclusions:: The long-term mortality of STEMI patients complicated by cardiogenic shock due to acute pump failure remains high even in the current clinical practice. In this high-risk category of patients, shorter onset-to-balloon and door-to-balloon time were associated with significantly lower long-term risk for mortality.
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