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The Journal of Thoracic and Cardiovascular Surgery, Vol 97, 235-239, Copyright © 1989 by The American Association for Thoracic Surgery and The Western Thoracic Surgical Association

ARTICLES

Loss of platelet fibrinogen receptors during clinical cardiopulmonary bypass

RK Wenger, H Lukasiewicz, BS Mikuta, S Niewiarowski and LH Edmunds Jr
Department of Surgery, School of Medicine, University of Pennsylvania, Philadelphia.

In 10 patients, cardiopulmonary bypass decreased the number of fibrinogen binding sites from 31,730 +/- 12,802 per platelet to 18,590 +/- 9,644 per platelet. Bypass also decreased the amount of the platelet membrane glycoprotein IIIa, which is part of the fibrinogen receptor complex, from 17.1 +/- 3.6 ng/10(9) platelets to 12.9 +/- 4.7. The fibrinogen binding constant did not change. Platelet sensitivity to adenosine diphosphate did not change; however, template bleeding times increased from 5.2 +/- 1.5 minutes before bypass to 8.5 +/- 2.3 minutes after bypass. Analysis of detergent washings from the perfusion circuit after bypass in five patients indicated that platelet material remains attached to the surface as membrane fragments and degranulated platelets. These data further elucidate the mechanism of platelet loss and dysfunction during cardiopulmonary bypass and highlight the importance of platelet membrane fibrinogen receptors and surface adsorbed fibrinogen in this process.

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