[Effects of induced hypotensive anesthesia on the blood coagulation-fibrinolysis system measured by thrombelastography--comparison between prostaglandin E1 and trimethaphan].

The coagulation-fibrinolysis system has been studied in two groups of 16 patients classified ASA 1 undergoing radical mastectomy during controlled hypotensive anesthesia induced by prostaglandin E1 (PGE1) or by trimethaphan (TMP) under enflurane anesthesia. Thrombelastography (TEG) was used to evaluate both coagulation and fibrinolysis systems, while simultaneously measuring platelet aggregation in response to ADP and collagen, prothrombin time (PT), activated partial thromboplastin time (APTT), serum concentrations of fibrinogen, and platelet counts. In the PGE1 group, APTT was significantly shortened (P less than 0.05) while the drug was being infused, but there was no statistically significant difference between the two groups, which was considered due to the effect of enflurane. Also, no statistically significant changes were noted in the other measured parameters. These results suggest that controlled hypotensive anesthesia using either PGE1 or TMP under enflurane anesthesia produces no significant changes in the blood coagulation-fibrinolysis system and that both are useful for the management of bleeding during surgery. Further, TEG was found to reflect other parameters properly. It is therefore useful for monitoring the blood coagulation-fibrinolysis system during anesthesia.