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[Morphology of myocardial perfusion (author's transl)]
Insights
Obstructive coronary atherosclerosis is the primary cause of myocardial perfusion disturbances. Severe coronary stenoses are not linked to risk factors and affect large arteries more than smaller ones.
Area of Science:
- Cardiovascular pathology
- Coronary artery disease
- Myocardial perfusion imaging
Background:
- Myocardial perfusion disturbances are predominantly caused by obstructive coronary atherosclerosis.
- The morphology of the narrowed lumen in coronary arteries is variable.
- Risk factors do not influence the location of severe coronary stenoses.
Purpose of the Study:
- To investigate the characteristics of obstructive coronary atherosclerosis and its impact on myocardial perfusion.
- To examine the relationship between atherosclerotic changes in large coronary arteries and intramural vessels.
- To correlate the extent of atherosclerosis with infarct size and perfusion areas.
Main Methods:
- Analysis of coronary artery morphology and lumen narrowing.
- Assessment of atherosclerotic lesion localization.
- Correlation of stenosis severity with infarct size and perfusion deficits.
- Histopathological examination of intramural coronary arteries and arterioles.
Main Results:
- Obstructive coronary atherosclerosis is the main cause of myocardial perfusion issues.
- Severe stenoses' localization is independent of risk factors.
- Atherosclerotic changes are more prevalent in epicardial coronary arteries than in their branches.
- A strong correlation exists between stenosis location/severity and infarct size/perfusion area.
- Minimal atherosclerotic lesions are found in small intramural arteries and arterioles.
- No positive correlation was observed between atherosclerosis in large coronary arteries and intramural arterioles.
Conclusions:
- Obstructive coronary atherosclerosis significantly impairs myocardial perfusion.
- The distribution and severity of atherosclerotic lesions in large coronary arteries correlate with myocardial damage.
- Intramural coronary arteries and arterioles show limited atherosclerotic changes, independent of epicardial disease extent.
Abstract:
Disturbances of myocardial perfusion are mostly due to obstructive coronary atherosclerosis. The shape of the narrowed lumen is polymorphic. The localization of severe stenoses is not influenced by risk factors. Atherosclerotic changes are more frequent in the coronary arteries than in their large branches. There is a good agreement between the localization and the size of the infarct and the poststenotic or postocclusive perfusion area. As a rule there are only few atherosclerotic lesions within samll intramural arteries and arterioles of the myocardium. We could not find a positive correlation between the extent of sclerotic changes in large coronary arteries and arterioles.