SPECIAL ARTICLE Reactivity of Cardiac Vessels and Reparative Processes Following Cardiac Infarction

the blood supply of tissues, the essential role belongs to the reactivity of blood vessels. Inadequate vascular reactivity, which is rare-ly observed in physiologie condition.s, may oc-cur rather frequently in pathologic situa-tions. Inadequate and especially a distorted vascular reaction increases the circulatory derangement resulting in the delay of repara-tive processes. The changes in vascular reac-tivity are of great significance, mainly for the functioning of the heart. In accordance with the above factors, there appears a very important assignment for the experimental investigations in the field of cardiovascular pathology, namely, for the studies of vascular reactivity in the heart and of different methods, which may lead to the activation of reparative processes fol-lowing cardiac infarctions as well as of other organic impairments of the heart, which might become useful for the eardiologic clinic. Materials and Methods Vasomotor activity of the heart was studied with the aid of the motion picture, coronary onkog-raphy, and automatic registration of the amounts of nutrient fluid outflowing from the vessels of isolated heart. A motion picture of the cardiac vessels was taken at the rate of 24 pictures per second in thoracotomized dogs exposed to the acute experi-mnent and maintained under artificial respiration for a period ranging from 20 to 90 minutes. Films of the imotion picture had registered the changes in form and size of the vessel lumoina, occurring i