Impact of the Admission Pathway on the Gender-Related Mortality of Patients With ST-Elevation Myocardial Infarction

Abstract

The mortality of women with ST-elevation myocardial infarction (STEMI) exceeds that of men, supposedly the result of older age and co-morbidities. Patients with STEMI can be transported directly to the catherization lab by the emergency medical service (EMS) or to the emergency department (ED) by the EMS, a regular ambulance, or independently. This raises the question whether gender disparity in the transport of patients with STEMI may affect time to therapy and consequently explain the disparate outcome in men and women with STEMI. We analyzed a large nationwide registry of prospectively-recorded patients with acute coronary syndromes in order to determine if there is a survival gap between men and women with STEMI, and to assess the gender-related effect of admission pathway on time intervals and 5-year mortality. Study population included 2,740 patients with STEMI who underwent primary percutaneous coronary interventions, comprising 464 women (17%, median-70 years) and 2,276 men (83%, median-58 years). The unadjusted 5-year mortality of women was higher compared with men (26.4% vs 15.6%, p = 0.001) but adjustment abrogated this survival difference. Regardless of adjustment, the 5-year mortality of patients with STEMI admitted directly to the catherization lab or to the ED by EMS was similar for men and women but significantly lower in the directly admitted patients (p <0.028). In contrast, admission to the ED by non-EMS was associated with markedly worse survival among women. These results indicate that women suspected of STEMI benefit from transportation by the EMS and should use this pathway exclusively to reach the hospital.