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J Thorac Cardiovasc Surg 1994;108:1083-1091
© 1994 Mosby, Inc.
CARDIOPULMONARY BYPASS, |
Linz, Austria, and Berne, Switzerland
Received for publication Feb. 9, 1994. Accepted for publication May 25, 1994. Address for reprints: Barbara Blauhut, MD, Blutspendedienst des Roten Kreuzes für Oberösterreich, Krankenhausstrasse 9, A-4020 Linz, Austria.
Abstract
Aprotinin reduces blood loss after cardiopulmonary bypass, but may sensitize recipients and is expensive. Tranexamic acid, a synthetic antifibrinolytic, has less disadvantages, but opinions differ regarding its efficacy. We studied three groups of patients undergoing cardiopulmonary bypass for coronary disease: recipients of aprotinin (total dose 4.2 x 106kallikreininhibiting units, n= 14), recipients of tranexamic acid (total dose 20 mg/kg body weight, n= 15), and nonmedicated controls (n= 14) during 24 hours after cardiopulmonary bypass. Compared with controls, aprotinin reduced blood loss, the number of patients requiring transfusions, and the mean number of transfused red cell units (all with p< 0.05), whereas the recipients of tranexamic acid did not differ either from aprotinin recipients or from controls. Aprotinin and tranexamic acid both mitigated the early postoperative reduction of adenosine diphosphate–induced platelet aggregation seen in the controls (p< 0.05). Postoperative increases of plasma concentrations of the prothrombin activation fragment F1+2and the thrombin-antithrombin III complex showed an activation of intravascular coagulation, without any intergroup differences. The balance between concentrations of tissue plasminogen activator and the type 1 plasminogen activator inhibitor disclosed an activation of fibrinolysis, without differences between the groups. The concentrations of D-dimer, a breakdown product of cross-linked fibrin, remained at baseline in the recipients of aprotinin and tranexamic acid but tripled in the controls (p< 0.05). By contrast, the plasma antiplasmin activity was equally depressed in the tranexamic acid and the control groups but decreased less in the recipients of aprotinin (p< 0.05). This discrepancy may reflect the different modes of action of the two agents, which may make aprotinin more efficacious than tranexamic acid in the "nonfibrinolytic" act of protecting platelet function against attack by plasmin during cardiopulmonary bypass. (J THORACCARDIOVASCSURG1994;108:1083-91)
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