Abstract
In Goldblatt rats, electron microscopic investigations of morphological changes in heart tissue during the compensatroy stage of pressure induced cardiac hypertrophy were performed. Myocardial cellular size enlarged considerably within the first 4 weeks after renal artery coarctation. An enlargement of the T-tubular system is particularly striking. The ratio of myofibril volume to total cell volume is significantly increased from the 4th-24th week and can at least partially explain a rise in developed tension which occurs in spite of a frequent disarrangement of myofibrils. In later stages severe changes in the vessel walls take place and there is an augmentation of connective tissue which impairs a correlation between myocardial cell alterations and mechanical parameters.
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