[The prostacyclin-thromboxane system and platelet hemostasis following aortocoronary bypass with an uncomplicated postoperative course]. / Prostatsiklin-tromboksanovaia sistema i trombotsitarnyi gemostaz posle aortokoronarnogo shuntirovaniia pri neoslozhnennom techenii posleoperatsionnogo perioda.

Prostacyclin-thromboxane system and platelet hemostasis have been studied in 56 patients upon aortocoronary bypass surgery with uncomplicated early postoperative period. It has been established that cardiopulmonary bypass surgery leads to a considerable increase in 6-keto-PGF1 alpha and TXB2 levels per platelet, as compared to preoperative values. By hour 18 postoperatively 6-keto-PGF1 alpha to platelet number ratio returns to baseline, while TXB2 to platelet number ratio remains higher than preoperative values, which determines a shift in 6-keto-PGF1 alpha to TXB2 ratio towards TXB2, thus ensuring, probably, enhanced platelet aggregation properties. Thrombocytopenia, a decrease in platelet aggregation properties and elevated blood plasma level of beta-thromboglobulin were observed upon aortocoronary bypass surgery. By hour 18 postoperatively the number of platelets increased significantly, their aggregation properties were enhanced, beta-thromboglobulin blood plasma level was reduced, however, the parameters under study did not reach normal values at that time. Increased levels of 6-keto-PGF1 alpha and TXB2 per platelet in the early postoperative period are considered an important component of compensatory-adaptive body reactions directed to normalization of the damaged body functions, namely hemostasis and microcirculation.

[The prostacyclin-thromboxane system and thrombocytic-vascular hemostasis in patients with ischemic heart disease in the preoperative period]. / Prostatsiklin-tromboksanovaia sistema i trombotsitarno-sosudistyi gemostaz u bol'nykh ishemicheskoi bolezn'iu serdtsa v dooperatsionnom periode.

Prostacyclin-thromboxane system (PTS) and platelet-vascular hemostasis have been studied in the preoperative period in 35 ischemic patients. A marked PTS disbalance with predominance of plasma thromboxane has been found. It has been established that in patients with postinfarction cardiosclerosis plasma prostacyclin content was significantly higher than in patients without myocardial infarction. The study of platelet function has demonstrated normal platelet aggregation rate and an increased level of beta-thromboglobulin in the blood of ischemic patients. Acetylsalicylic acid (250 mg/daily) was used for the correction of the disturbances observed, it reduced platelet aggregation, but had no effect on PTS and platelet release.