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[Safety of continuous epidural anesthesia during heart surgery--change of coagulation-fibrinolysis under heparinization].

To confirm the safety of continuous epidural anesthesia during extracorporeal circulation under heparinization, we investigated epidural hematoma formation following the cardiopulmonary bypass in both humans and dogs. In fifteen dogs, divided into three groups, heparin was administered at the dose of 300, 600, or 900 U.kg-1, respectively. In fourteen patients, a dose of 300 U.kg-1 haparin was administered for cardiopulmonary bypass. Although blood coagulation-fibrinolysis dropped into abnormal ranges following heparinization, no epidural hematoma was observed in dog and no patient revealed spinal complication associated with epidural hematoma. These data indicate that continuous epidural anesthesia would be a safe tool for intraoperative anesthesia even during extracorporeal circulation under heparinization.