Related Experiment Videos
Quantitative angiographic morphology of coronary stenoses leading to myocardial infarction or unstable angina
Insights
Coronary lesions in patients with myocardial infarction or unstable angina show plaque disruption, differing from stable angina. Angiography revealed similar stenosis but distinct ulceration indices in high-risk groups.
Area of Science:
- Cardiology
- Interventional Cardiology
- Vascular Biology
Background:
- Identifying coronary lesions prone to myocardial infarction (MI) is crucial for prevention strategies.
- Atherosclerotic plaque disruption may characterize high-risk coronary lesions.
Purpose of the Study:
- To determine if coronary lesions associated with acute MI or unstable angina exhibit distinct angiographic morphology compared to stable angina.
- To assess quantitative angiographic features, including luminal irregularity and ulceration index, in different coronary artery disease presentations.
Main Methods:
- Quantitative coronary angiography using the Brown-Dodge method was performed on three patient groups: acute MI, unstable angina, and chronic stable angina.
- Measurements included serial arterial diameters, percent area stenosis, minimum luminal cross-sectional area, and an "ulceration" index to quantify luminal irregularity.
Main Results:
- All analyzed lesions demonstrated severe luminal stenosis (mean 78% area stenosis).
- Percent stenosis and minimum luminal area did not reliably differentiate lesions in MI/unstable angina from stable angina groups.
- A significantly higher "ulceration" index was observed in lesions associated with unstable angina (0.62 ± 0.05) and acute MI (0.61 ± 0.03) compared to stable angina.
Conclusions:
- While overall stenosis severity is similar, coronary lesions in acute MI and unstable angina exhibit greater angiographic evidence of plaque disruption (higher ulceration index).
- The "ulceration" index may serve as a valuable morphological marker for identifying high-risk coronary lesions.
- These findings support the potential for prospective evaluation of infarct prevention strategies based on lesion morphology.
Abstract:
Identification of a characteristic morphology of a coronary stenosis likely to result in myocardial infarction would facilitate the prospective evaluation of infarct prevention strategies and identification of high-risk patients. We postulated that coronary lesions associated with recent myocardial infarction or unstable angina would have an angiographic morphology suggesting disruption of an atherosclerotic plaque and would appear morphologically different from lesions associated with chronic stable angina. To test this hypothesis, quantitative coronary angiography (Brown-Dodge method) was performed in 15 patients 4 to 30 days after myocardial infarction, in 10 patients with the abrupt onset of unstable angina and single-vessel coronary disease, and in 15 patients with chronic stable angina without prior myocardial infarction. Serial arterial diameters (20 to 40) within each lesion were determined and the degree of luminal irregularity was quantitated by calculation of an "ulceration" index. The majority of all lesions analyzed resulted in severe luminal stenosis (mean 78% area stenosis, all groups). Despite small differences in mean lesion severity among groups, overlap in the degree of luminal compromise prevented precise classification of lesions associated with myocardial infarction or unstable angina based on percent stenosis or minimum luminal cross-sectional area. The mean ulceration index of lesions in patients with unstable angina and in the infarct-related vessel in those with acute myocardial infarction was 0.62 +/- 0.05 (+/- SEM) and 0.61 +/- 0.03, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)