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Predictors of spontaneous predischarge ischemia following acute myocardial infarction
L A Piérard1, A Albert, H E Kulbertus
1Department of Medicine, University Hospital, Liège, Belgium.
Insights
Spontaneous predischarge ischemia after heart attack is predictable with early factors like age and smoking history. This condition impacts 1-year mortality but not overall 3-year survival rates.
Area of Science:
- Cardiology
- Clinical Medicine
- Internal Medicine
Background:
- Spontaneous predischarge ischemia following acute myocardial infarction (MI) can impact patient outcomes.
- Predicting this ischemia early is crucial for risk stratification and management.
Purpose of the Study:
- To identify early predictors of spontaneous predischarge ischemia after acute myocardial infarction.
- To determine the consequences of this ischemia on long-term mortality.
Main Methods:
- A consecutive series of 943 acute myocardial infarction patients (no thrombolysis) were studied.
- Spontaneous predischarge ischemia was defined as rest angina with ECG changes before discharge, >3 days post-MI.
- Patients were followed for 3 years to assess mortality.
Main Results:
- 17.5% of patients experienced spontaneous predischarge ischemia.
- Predictors included prior angina, non-Q-wave MI, older age, and non-smoking status.
- Ischemia was associated with higher 1-year mortality (16% vs. 10%) but not significantly different 3-year mortality.
Conclusions:
- Early identification of patients at risk for spontaneous predischarge ischemia is possible using readily available clinical data.
- Left ventricular function, prior MI history, and smoking status predict mortality in patients with ischemia.
Abstract:
To determine if the occurrence and the consequences of spontaneous predischarge postinfarction ischemia could be predicted early after hospital admission, a consecutive series of patients with acute myocardial infarction was studied and followed for 3 years. No patient was treated by thrombolysis. Spontaneous predischarge ischemia was defined as angina that occurred at rest before hospital discharge, at least 3 days after the acute event, and that was accompanied by electrocardiographic changes, but not by an increase in cardiac enzymes. Patients who died within the first 3 days were excluded from analysis. Among the 943 patients who survived at least 3 days, 165 (17.5%) had spontaneous ischemia before discharge. They had a higher 1-year post-hospital mortality (16 vs. 10%), but did not have significantly higher total 3-year mortality rates. Four independent, early available variables predictive of the occurrence of spontaneous ischemia were selected from a stepwise logistic discriminant analysis: history of angina before infarction, non-Q-wave infarct, absence of smoking, and higher age. Among the 165 patients with spontaneous ischemia, 3 independent variables predictive of 3-year mortality were selected stepwise: left ventricular function score, history of previous infarction, and absence of smoking.