[The microcirculatory bed of the myocardium in experimental embolism of the branches of the pulmonary artery].

Experiments were conducted on rabbits to appraise the condition of the myocardial microcirculatory channel (MCC) in embolism of branches of the pulmonary artery and to determine the dynamics of changes in the MCC with explanation of the mechanisms of their compensation. Mobilization of nonfunctioning capillaries in the healthy myocardium was revealed in the early postembolism period. Compensatory reaction of the thebesian drainage from the 1st to 7th day after the embolism was demonstrated. Ultrastructural changes of the myocardial MCC were found in embolism of the branches of the pulmonary artery. Vulnerability of the posterior parts of the left-ventricular myocardium and the anterior wall of the right ventricle in relation to insufficiency of coronary blood supply in embolism of the branches of the pulmonary artery was noted.