[Ultrastructure of myocardial capillaries in chronic ischemic heart disease]. / U'ltrastruktura kapilliarov miokarda pri khronicheskoi ishemicheskoi bolezni serdtsa.

Intraoperative myocardial biopsy specimens taken from 50 patients with coronary heart disease were studied to examine ultrastructure of myocardial capillaries. It was found that this disease was characterized by abundant myocardial capillaries with a narrowed lumen. Quantitative stereological analysis indicated that the ultrastructure of the capillaries with narrowed lumen was not substantially different from that of open capillaries. The findings showed that the narrowed capillaries to be reserve and capable of providing an adequate blood supply of cardiomyocytes after aortocoronary bypass surgery.

[Reparative regeneration of microvascular anastomosis]. / Reparativnaia regeneratsiia mikrososudistogo anastomoza.

Dynamics of reparative regeneration of the sutural anastomosis of the abdominal aorta has been studied in 90 white mice during the time from 1 day up to 1 year. The operation has been performed by means of microsurgical technique. Histological, histochemical, electron microscopic and radioautographic (3H-thymidine and 3H-uridine labelling) methods have been used. By the 7th day fibrin is organized on the adventitia, the scar along the resection line is formed, endothelial lining and middle layer of the vascular wall are restored. As sources of regeneration in the anastomosis serve cellular elements preserved in the lesion margins. Further maturation of the formed structures and formation of the initial thickening by migrating smooth muscle cells of the middle layer take place. Completeness and typicity depend on preservation of the elastic carcass in the middle layer and adventitia.