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European Journal of Cardio-Thoracic Surgery, Vol 8, 87-90, Copyright © 1994 by European Association for Cardio-thoracic Surgery

ARTICLES

Aprotinin effect on platelet function and clotting during cardiopulmonary bypass

N Tabuchi, J De Haan, PW Boonstra, RC Huet and W van Oeveren
Thoraxcenter, Cardiopulmonary Surgery, University Hospital Groningen, The Netherlands.

A variety of studies have been performed on the preservation of hemostasis by aprotinin during cardiopulmonary bypass (CPB). It appears that the mechanism of aprotinin to preserve hemostasis can be interpreted in different ways. Our previous studies suggested that preservation of platelet glycoprotein Ib (GpIb) antigen, and counteraction of heparin anticoagulation in the extrinsic clotting pathway might partly explain the preservative effect of aprotinin. A clinical study was therefore conducted to evaluate these effects during the use of low dose aprotinin. Improved agglutination by ristocetin (P < 0.05), and improved GpIb antigen expression (P < 0.05) during CPB showed better preserved platelet adhesive capacity in the aprotinin group than in the control group. Glycoprotein Ib antigen expression and the agglutination capacity with ristocetin during CPB were closely related (P < 0.05). Platelet GpIIb/IIIa antigen and adenosine diphosphate (ADP) aggregation were not significantly different between the aprotinin and control groups. Aprotinin had no effect on the extrinsic clotting pathway in the blood, since the thromboplastin clotting time was similar in both groups. These results indicate that the protection of platelet adhesive capacity during CPB is a main function of aprotinin, whereas no evidence was collected for enhanced extrinsic clotting by aprotinin during CPB.

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