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[Comparison of coronary arteriosclerosis in patients with myocardial infarction and angina pectoris]
W C Manfroi1, A J Zago, C B Leitão
1UFRGS-Hospital de Clínicas de Porto Alegre.
Insights
Patients with myocardial infarction (MI) show greater coronary heart disease severity and extent compared to angina patients. Smoking is identified as a key independent risk factor for MI.
Area of Science:
- Cardiology
- Cardiovascular Research
- Medical Imaging
Background:
- Coronary heart disease (CHD) is a leading cause of mortality worldwide.
- Differentiating between angina and myocardial infarction (MI) is crucial for patient management.
- Understanding the differences in CHD severity and risk factors between these conditions is essential for targeted interventions.
Purpose of the Study:
- To compare the severity and extent of coronary heart disease between patients diagnosed with angina and myocardial infarction (MI).
- To investigate the prevalence of coronary risk factors in patients with angina versus MI.
Main Methods:
- Coronary angiography was performed on 62 patients with MI and 129 patients with angina.
- Angiograms were evaluated for lesion occlusion, extent (number of vessels affected), and severity (degree of stenosis).
- Two independent observers performed blinded interpretation of the angiograms.
Main Results:
- Myocardial infarction patients exhibited significantly higher rates of coronary artery occlusion (50% vs 13.2%, p < 0.01).
- A greater proportion of MI patients had severe stenosis (>90%) compared to angina patients (79% vs 54.3%, p < 0.02).
- The extent of CHD was more widespread in the MI group (score 2.0 vs 0.87, p < 0.001), independent of risk factors and disease duration. Smoking emerged as the sole independent risk factor for MI (p < 0.001).
Conclusions:
- Coronary heart disease is demonstrably more severe and extensive in patients experiencing myocardial infarction compared to those with angina.
- The prevalence of smoking was also significantly higher in the MI cohort.
- These findings underscore the critical differences in disease pathology and highlight smoking as a significant independent risk factor for MI.
Purpose:
To compare the severity of the coronary heart disease and the presence of coronary risk factors between angina and myocardial infarction (MI) patients.
Methods:
We studied 62 patients with MI and 129 with angina through coronary angiography to evaluate occlusion (lesion of 99% or 100%), extent (with a score of 0-5 derived by the number of vessels affected) and severity (3 groups of different stenosis degrees). Two experiment observers blindly interpreted the angiograms.
Results:
Patients with MI had more occlusions (50% vs 13.2% [p < 0.01]), more severity (79% vs 54.3% with > 90% stenosis [p < 0.02]) and more extent (2.0 vs 0.87; [p < 0.001]), even when controlled for current coronary risk factors and disease duration. Smoking was the only independent risk factor related to MI (p < 0.001).
Conclusion:
Among the studied patients, coronary heart disease extent and severity was greater in the MI group, as well as the prevalence smoking.