title: [Myocardial ultrastructure in experimental stenosis of the thoracic aorta in dogs].
abstract: Myocardium of the left ventricle of the heart has been studied in 15 dogs with an experimental aortic stenosis and in 5 control dogs. It has been demonstrated that 15-30 min after stenosis of the thoracic aorta, certain destructuve changes occur, first of all in myocitic mitochondria; later, myofibrillar and capillary endothelial cells lesions are revealed. The destructive changes are mostly pronounced 1-2 days after the aortic stenosis. Mosaic picture depending on heterogeneity of cardiomyocitic ultrastructure is observed. At the same time, certain compensatory changes take place: increase in number of ribosomes, polysomes, outgrowth of the granular sarcoplasmic reticulum, division and increase in size of mitochondria. Myofibrillar hypertrophy, noted 1 week after the operation, stabilizes by the 2nd month. Later (more than in a year), structural rearrangement of myofibrillae and increased mitochondrial destruction are noted.
mesh_terms: D000818:Animals; D001013:Aorta, Thoracic / Q000473:pathology; D001018:Aortic Diseases / Q000473:pathology*; D003251:Constriction, Pathologic / Q000473:pathology; D004285:Dogs; D005260:Female; D006352:Heart Ventricles / Q000648:ultrastructure; D008297:Male; D008854:Microscopy, Electron; D009206:Myocardium / Q000648:ultrastructure*
vernacular_title: Ul'trastruktura miokarda pri éksperimentalnom stenoze grudnoĭ aorty u sobak.