Summary
The aim of this study was to investigate morphologic changes in chronic hibernation. Light and electron microscopy were performed on myocardium derived from the anterior wall of the left ventricle of 165 patients during coronary artery bypass grafting. The changes seen in a substantial part of the cardiomyocytes corresponded to “dedifferentiation” rather than atrophic “degeneration”. The affected cardiomyocytes showed a partial to complete loss of sarcomeres, sarcoplasmic reticulum, and T-tubules and presented an abundant amount of glycogen, and lots of small mitochondria. The volume of the cells was similar to that of normal cells. The number of the affected cells was consistently higher in endocardial parts than in epicardial ones. The cell changes occurred in the myocardium of patients both with and without a previous infarction. A significant relationship was found in noninfarcted patients between the presence of affected cells and the amount of connective tissue. It is proposed that myocardial segments in which these structural changes prevail will not recover immediately after revascularization but that they might show a delayed recovery of function, because structural remodeling requires time in order to regain sufficient contractile material and to normalize the amount of connective tissue between the cardiomyocytes.
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Ausma, J., Ramaekers, F., Shivalkar, B., Thone, F., Flameng, W., Borgers, M. (1994). Cellular Adaptation in Hibernating Myocardium in the Human. In: Hori, M., Maruyama, Y., Reneman, R.S. (eds) Cardiac Adaptation and Failure. Springer, Tokyo. https://doi.org/10.1007/978-4-431-67014-8_7
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DOI: https://doi.org/10.1007/978-4-431-67014-8_7
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