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Chronic degenerative changes in the myocardium supplied by bridged coronary arteries in eight postmortem samples
S T Karahan1, H S Sürücü, E Karaöz
1Department of Anatomy, Faculty of Medicine, Ankara University, Turkey. tkarahan@turk.net
Insights
Myocardial bridges, where coronary arteries run within the heart muscle, can cause silent, long-term ischemic heart disease. This study found increased connective tissue and inflammatory cells in affected heart tissue, indicating chronic degenerative changes.
Area of Science:
- Cardiovascular Pathology
- Human Anatomy
- Histology
Background:
- Coronary arteries can travel subepicardially or intramyocardially in humans.
- Intramyocardial coronary arteries may lead to acute ischemic heart disease or be asymptomatic.
Purpose of the Study:
- To investigate the long-term ischemic effects of myocardial bridges on heart muscle.
- To analyze the histological changes in myocardium associated with bridged coronary arteries.
Main Methods:
- Examination of 8 autopsy hearts with myocardial bridges and 2 control hearts.
- Light microscopy analysis of myocardial tissue samples.
Main Results:
- Increased intercellular connective tissue, rich in collagen, was observed in the myocardium supplied by bridged arteries.
- Presence of lymphocytes, fibroblasts, and macrophages indicated chronic inflammation and degeneration.
Conclusions:
- Compression of coronary arteries by myocardial bridges can induce chronic, potentially silent, degenerative changes in the myocardium.
- These findings highlight the long-term pathological consequences of intramyocardial coronary artery courses.
Abstract:
In humans, the coronary arteries course not only subepicardially but also intramyocardially. The intramyocardial course of the coronary artery is reported to lead to acute ischemic heart disease and, as well, it may be symptomless. The aim of this study was to investigate the long-term ischemic effects of bridged arteries on the myocardium, and was carried out on 8 autopsy hearts with myocardial bridges and 2 hearts without myocardial bridges. The samples from the myocardium were examined with light microscopy. In the myocardium supplied by the bridged arteries, it was observed that there was an increase in the intercellular connective tissue, which was rich in collagen bundles, lymphocytes, fibroblasts and macrophages. Compression of the coronary artery by myocardial bridges may cause chronic degenerative changes, which may remain silent for a long time.