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[10-year survival after myocardial infarction. Longitudinal study of a hospital population]
Insights
Long-term survival after acute myocardial infarction is poor, with high cardiac mortality and recurrence rates. Key risk factors include age, heart failure, and positive exercise tests post-infarction.
Area of Science:
- Cardiology
- Clinical Medicine
Context:
- Acute myocardial infarction (AMI) is a leading cause of mortality worldwide.
- Long-term outcomes and predictors of death after AMI require continued investigation.
Purpose:
- To evaluate the long-term (10-year) mortality and morbidity in patients surviving an acute myocardial infarction.
- To identify clinical and electrocardiographic predictors of death and recurrent infarction.
Summary:
- This 10-year follow-up study of 321 acute myocardial infarction survivors revealed a 46.4% death rate, with 30.8% of fatalities being sudden cardiac deaths, often occurring out-of-hospital.
- Significant mortality predictors included advanced age, female sex, prior infarction, diabetes, heart failure, specific cardiac findings (murmur, cardiomegaly, conduction defects), and post-infarction angina.
- A positive exercise test 6-17 months post-infarction was associated with a four-fold increase in mortality. Recurrent nonfatal infarction occurred in 22.1% of patients.
Impact:
- Findings highlight the substantial long-term risk following acute myocardial infarction, emphasizing the need for risk stratification and targeted interventions.
- Identifies specific patient characteristics and test results that predict poor prognosis, aiding clinical decision-making.
- The study underscores the importance of managing risk factors and monitoring patients closely in the years following an infarction.
Abstract:
In this study, 321 patients discharged from hospital after an acute myocardial infarction were followed for 10 years or until death. Death rate was 46.4% and 30.8% of all fatalities was sudden. In over 80% of the cases death was from cardiac causes and frequently occurred out of hospital. Univariate analysis showed that age, female sex, previous infarction, diabetes, heart failure during hospitalization, heart murmur, NYHA class III or IV, post-infarction angina, intraventricular conduction defects, cardiomegaly, ST displacement, were all associated with an increased death rate. A positive exercise test 6-17 months after infarction, was associated with a 4-fold mortality increase. Bypass played a minor role in this series since only 6.8% of the patients underwent this operation. A nonfatal infarction recurred in 71 patients (22.1%) with an annual rate of 2.2%. Annual death rate after the first 2 years of follow-up was 3.9%, as in most recent reports on survival after myocardial infarction.