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The pathological basis and microanatomy of occlusive thrombus formation in human coronary arteries
Insights
Myocardial infarction patterns vary. Regional infarction links to artery clots, while diffuse necrosis doesn't always. Thrombi often form from plaque dissection, compressing the artery lumen.
Area of Science:
- Cardiovascular Pathology
- Histopathology
Background:
- Myocardial necrosis (infarction) presents in distinct patterns, including regional and diffuse forms.
- Regional infarction is typically linked to acute occlusive thrombosis in the supplying coronary artery.
- Diffuse subendocardial necrosis is not consistently associated with thrombi.
Purpose of the Study:
- To investigate the pathological characteristics of myocardial infarction.
- To elucidate the relationship between thrombi formation and coronary artery pathology.
Main Methods:
- Reconstruction of occlusive thrombi from post-mortem coronary arteriograms using serial sections at 150-micron intervals.
- Histopathological examination of thrombi and associated atheromatous plaques.
Main Results:
- Occlusive thrombi were identified in regional myocardial infarction.
- Most thrombi were associated with dissection tracks into the intima at atheromatous plaques.
- The dissection into plaques was often extensive, involving spirals and significantly compressing the original lumen.
Conclusions:
- The formation of occlusive thrombi in myocardial infarction involves complex dissection into atheromatous plaques.
- Previous understandings of plaque rupture underestimated the extent of intimal dissection by blood.
Abstract:
Myocardial necrosis, usually called infarction, occurs in different patterns. A common form is necrosis of one segment of the left ventricle, i.e., anterior, septal, lateral or posterior. This regional infarction is consistently associated with an acute occlusive thrombosis of the artery supply that region. Diffuse necrosis involving the whole circumference, usually the subendocardial zone, of the ventricle is not consistently associated with thrombi. Occlusive thrombi identified in post-mortem coronary arterio-grams have been reconstructed in their entirety from serial sections at 150 micron intervals. Most occlusive thrombi were found to be associated with a dissection track into the intima at an atheromatous plaque. The break into the plaque usually extended over several millimeters, often in spirals, so that a mass of thrombus within the plaque compressed the original lumen. Previous accounts of plaque rupture or cracking greatly underestimated the magnitude of the dissection of blood into the intima.