| Summary: | Background: Despite improvements in ST elevation myocardial infarction (STEMI) care, total ischemic time remains long in patients who present late. Our goal was to identify predictors of very late presentation (≥12 h) of STEMI and determine long-term mortality. Methods: We retrospectively examined consecutive patients admitted with STEMI to our institution using the ACTION Registry™. Time of symptom onset to first medical contact (FMC) was calculated and categorized as <12 h or ≥12 h. Predictors of very late presentation were determined. Results: Compared to patients who presented <12 h (n = 365), those who presented ≥12 h (n = 49) after symptom onset were more likely women, diabetics, and those with prior coronary revascularization. In addition, patients who presented ≥12 h had worse ventricular function, were less likely to report chest pain, and were less likely to be transported by ambulance and to undergo coronary angiography. Late presenters had higher rates of heart failure, longer hospitalizations, and were less likely to be discharged home. Diabetes, female sex, and absence of chest pain were strong predictors of late presentation. Long-term survival was significantly lower in late presenters (73% vs. 93%, p = 0.007). Conclusions: Female sex, diabetes, and absence of chest pain are strong predictors of presentation delay, and long-term mortality is significantly increased in those presenting very late. Keywords: Late presentation, STEMI
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