[Structural changes in the vessels of the heart in different hemodynamic disorders in the coronary basin]

Coarctation of the aorta was created in 15 and stenosis of the pulmonary arteri in 20 puppies. In the first experimental defect the blood inflow into the coronary basin increased, in the second the outflow from it was disturbed. The proposed method of complex histomicrometria was used to study changes in coronary vessels of various calibers. In both disorders of the coronary hemodynamics, hypertrophy of tunica media of arteries of all levels, an increase in their walls of the amount and power of obliquelongitudinal muscles, and hypertrophy of muscle-elastic sphincters in the openings of side branches going from small arteries were observed. Signs distinguishing one defect from the other were found at different levels of the vascular system of the heart. Their emergence is associated with hypertrophy of one or another part of the heart and features of the coronary hemodynamics inherent in each defect.