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Angiographic morphology and the pathogenesis of unstable angina pectoris
Insights
Type II eccentric coronary lesions are more common in unstable angina patients, likely indicating ruptured plaques or thrombi. This morphology may explain chest pain in unstable angina by reducing coronary blood flow.
Area of Science:
- Cardiology
- Vascular Biology
- Medical Imaging
Background:
- Coronary artery disease (CAD) manifests as stable or unstable angina.
- Understanding coronary lesion morphology is crucial for diagnosing and managing angina.
Purpose of the Study:
- To investigate the association between coronary artery lesion morphology and angina type (stable vs. unstable).
- To characterize the specific lesion types linked to unstable angina.
Main Methods:
- Qualitative assessment of coronary artery lesions in 110 patients using angiography.
- Categorization of lesions into concentric, type I eccentric, type II eccentric, and multiple irregular narrowings.
- Statistical analysis to compare lesion morphology between stable and unstable angina groups.
Main Results:
- Type II eccentric lesions were significantly more frequent in patients with unstable angina (p < 0.001).
- Concentric and type I eccentric lesions were more prevalent in stable angina patients (p < 0.05).
- Type II eccentric lesions were found in a higher proportion of arteries in unstable angina patients (p < 0.0001).
Conclusions:
- Type II eccentric lesions are strongly associated with unstable angina.
- These lesions may represent ruptured atherosclerotic plaques or thrombi.
- Reduced coronary perfusion due to type II eccentric lesions likely contributes to chest pain in unstable angina.
Abstract:
In 110 patients with either stable or unstable angina, the morphology of coronary artery lesions was qualitatively assessed at angiography. Each obstruction reducing the luminal diameter of the vessel by 50% or greater was categorized into one of the following morphologic groups: concentric (symmetric narrowing); type I eccentric (asymmetric narrowing with smooth borders and a broad neck); type II eccentric (asymmetric with a narrow neck or irregular borders, or both); and multiple irregular coronary narrowings in series. For the entire group, type II eccentric lesions were significantly more frequent in the 63 patients with unstable angina (p less than 0.001), whereas concentric and type I eccentric lesions were seen more frequently in the 47 patients with stable angina (p less than 0.05). Type II eccentric lesions were also present in 29 of 41 arteries in patients with unstable angina compared with 4 of 25 arteries in those with stable angina (p less than 0.0001) in whom an "angina-producing" artery could be identified. Therefore, type II eccentric lesions are frequent in patients with unstable angina and probably represent ruptured atherosclerotic plaques or partially occlusive thrombi, or both. A temporary decrease in coronary perfusion secondary to these plaques with or without superimposed transient platelet thrombi or altered vasomotor tone may be responsible for chest pain in some of these patients with unstable angina.