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Predictors of non-fatal ischemic events after myocardial infarction
1Cardiac Unit, Hospital Clinic, University of Barcelona, Spain.
Insights
Multi-vessel coronary artery disease significantly increases the risk of reinfarction and angina after a heart attack. Identifying the number of diseased vessels is crucial for predicting future ischemic events in men under 60.
Area of Science:
- Cardiology
- Clinical Medicine
- Medical Research
Background:
- Myocardial infarction (MI) is a leading cause of cardiovascular morbidity and mortality.
- Predicting subsequent ischemic events like reinfarction and angina is crucial for patient management.
- Understanding risk factors post-MI aids in developing targeted prevention strategies.
Purpose of the Study:
- To identify independent predictors of reinfarction and angina in men aged 60 years or less following a qualifying myocardial infarction.
- To assess the impact of coronary artery disease severity on the risk of recurrent ischemic events.
Main Methods:
- A cohort of 403 men aged 60 or less, who underwent heart catheterization within one month post-MI, were analyzed.
- Coronary angiography was performed to assess the number of diseased vessels (obstructive lesions >= 50% diameter reduction).
- Cox regression analysis and risk stratification were used to identify predictors and probabilities of reinfarction and angina over a 57-month follow-up period.
Main Results:
- The number of diseased vessels was the sole independent predictor of reinfarction.
- Both the number of diseased vessels and a prior history of angina predicted future angina.
- Patients with one-vessel disease had significantly lower probabilities of reinfarction (12%) and angina (51%) at 6 years compared to those with two- (30%, 72%) or three-vessel disease (37%, 74%).
Conclusions:
- Multi-vessel coronary artery disease is the primary predictor of new non-fatal ischemic events after myocardial infarction.
- Risk stratification based on the number of diseased vessels can effectively identify patients at higher risk for reinfarction and angina.
- These findings underscore the importance of comprehensive coronary assessment and risk stratification in post-MI management.
Abstract:
We characterize predictors of reinfarction and angina in 403 consecutive men aged 60 years or less who underwent heart catheterization within one month (18 +/- 6 days) after a qualifying myocardial infarction. Angiography showed obstructive lesions (greater than or equal to 50% diameter reduction) in 380 patients. One-, two- and three-vessel disease was found in 143 (36%), 139 (35%) and 98 (29%) patients, respectively. After 57 months of follow-up there were 60 deaths (12%), 41 patients (10%) sustained a new infarction and 210 (52%) had angina. Cox regression analysis selected the number of diseased vessels as the only independent 'predictor of reinfarction; independent predictors of angina were the number of diseased vessels and a history of angina prior to the qualifying infarction. Risk stratification showed the probability of reinfarction at 6 years to be significantly lower (P less than 0.001) in patients with one-vessel disease (12%) than in those with two- (30%) and three-vessel disease (37%). Similarly the probability of angina was also lower (P less than 0.001) in patients with one-vessel disease (51%) as compared to those with two- (72%) and three-(74%) vessel involvement. Thus multi-vessel disease is the main predictor of new non-fatal ischemic events after myocardial infarction.