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Significance of the angiographic morphology of localized coronary stenoses: histopathologic correlations
Insights
Postmortem angiography can identify complicated atherosclerotic lesions in coronary arteries. Irregular borders or intraluminal lucencies on angiography suggest a higher risk of myocardial infarction or sudden death.
Area of Science:
- Cardiovascular Pathology
- Interventional Cardiology
- Diagnostic Imaging
Background:
- Atherosclerotic coronary artery stenosis is a leading cause of myocardial infarction and sudden death.
- Distinguishing between complicated and uncomplicated atherosclerotic lesions is crucial for risk stratification.
- Current diagnostic methods may not always accurately differentiate lesion complexity.
Purpose of the Study:
- To correlate postmortem coronary angiographic morphology with histologic findings.
- To determine if angiographic features can reliably detect complicated atherosclerotic lesions.
- To assess the clinical significance of angiographically identified lesion types.
Main Methods:
- Postmortem examination of 73 localized subtotal coronary artery stenoses (50-99% luminal reduction).
- Correlation of coronary angiographic morphology (Type I: smooth, hourglass; Type II: irregular borders/lucencies) with histologic sections.
- Histologic classification into uncomplicated (intact plaque, no thrombus) and complicated (rupture, hemorrhage, thrombus) lesions.
Main Results:
- Type I angiographic morphology (smooth borders) corresponded to uncomplicated lesions in 88.6% of cases.
- Type II angiographic morphology (irregular borders/lucencies) corresponded to complicated lesions in 78.9% of cases.
- Postmortem angiography demonstrated 88% sensitivity and 79% specificity for detecting complicated stenoses.
Conclusions:
- Angiographic features like irregular borders or intraluminal lucencies are indicative of "complicated" atherosclerotic lesions.
- Complicated lesions, often associated with acute thrombosis, pose a greater risk for acute myocardial infarction and sudden death.
- This study suggests angiographic morphology can help identify clinically significant, high-risk coronary stenoses.
Abstract:
Postmortem coronary angiographic morphology was correlated with histologic sections of 73 localized subtotal coronary artery stenoses (50-99% reduction of luminal diameter) to determine whether complicated or uncomplicated atherosclerotic lesions could be detected angiographically. Lesions were divided into two types, according to angiographic morphology: Type I stenoses had smooth borders, an hourglass configurations, and no intraluminal lucencies; type II stenoses had irregular borders or intraluminal lucencies. Histologic sections were also divided into two types: "uncomplicated" stenoses had fatty or fibrous plaques with intact intimal surfaces and no superimposed thrombus; "complicated" stenoses manifested plaque rupture, plaque hemorrhage, superimposed partially occluding thrombus, or recanalized thrombus. Among 35 lesions with type I angiographic morphology, four (11.4%) were complicated lesions histologically. Among the 38 stenoses showing type II angiographic morphology, 30 (78.9%) were complicated lesions. Postmortem angiography thus had a sensitivity of 88% and specificity of 79% for detecting complicated stenoses on the basis of irregular borders or intraluminal lucencies. Pathologic studies have shown that acute occlusive thrombosis of a coronary artery is usually associated with complicated atherosclerotic stenoses. Thus, complicated lesions represent a greater risk factor for acute myocardial infarction or sudden death than do uncomplicated lesions. This study suggests that coronary stenoses characterized angiographically by irregular borders or intraluminal lucencies are probably the clinically more dangerous "complicated" type.