Prevalence of risk factors at presentation and early mortality in patients aged 80 years or older with ST-segment elevation myocardial infarction

BACKGROUND: Elderly patients with ST-segment elevation myocardial infarction (STEMI) are at high risk for complications and early mortality; still, they are underrepresented in clinical trials and observational studies. We studied the risk profiles at presentation and early mortality in elderly (≥80 years) versus younger (<80 years) STEMI patients. DESIGN: This was a prospective cohort study. METHODS: The study population comprised 4,092 consecutive STEMI patients admitted to Oslo University Hospital, Ulleval from 2006 to 2010. Baseline characteristics at admission were recorded, as well as in-hospital mortality. Etiologic strategy was used in the analyses. RESULTS: Patients ≥80 years of age (n=536) were more likely to be women and have prior myocardial infarction, angina, and stroke, but were less likely to be current smokers. The crude in-hospital mortality was 16.2% in patients aged 80 years and older versus 3.5% in those younger than 80 years. The adjusted odds ratio for mortality in patients aged 80 years and older versus those younger than 80 years increased with increasing levels of serum creatinine and total cholesterol. In patients with low levels of serum creatinine and total cholesterol, the odds ratio was 3.01 (95% confidence interval, 1.86-4.93; P=0.0001); increasing to 11.72 (95% confidence interval, 5.26-26.3; P=0.001) in patients with high levels. CONCLUSION: High levels of serum cholesterol and creatinine were important risk factors for early mortality in elderly patients. Depending on the levels of cholesterol and creatinine, in-hospital mortality in patients aged 80 years and older varied from a threefold to an almost twelvefold risk compared with younger patients.