Thromb Haemost 1998; 80(03): 437-442
DOI: 10.1055/s-0037-1615226
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Schattauer GmbH

A Heparin-coated Circuit Maintains Platelet Aggregability in Response to Shear Stress in an In Vitro Model of Cardiopulmonary Bypass

I. Hioki
1   From the Department of Thoracic and Cardiovascular Surgery, Edobashi, Tsu, Mie
,
M. Nishikawa
2   From the 2nd Department of Internal Medicine, Mie University School of Medicine, Edobashi, Tsu, Mie
,
K. Onoda
1   From the Department of Thoracic and Cardiovascular Surgery, Edobashi, Tsu, Mie
,
T. Shimono
1   From the Department of Thoracic and Cardiovascular Surgery, Edobashi, Tsu, Mie
,
H. Shimpo
1   From the Department of Thoracic and Cardiovascular Surgery, Edobashi, Tsu, Mie
,
K. Tanaka
1   From the Department of Thoracic and Cardiovascular Surgery, Edobashi, Tsu, Mie
,
Y. Suzuki
2   From the 2nd Department of Internal Medicine, Mie University School of Medicine, Edobashi, Tsu, Mie
,
H. Shiku
2   From the 2nd Department of Internal Medicine, Mie University School of Medicine, Edobashi, Tsu, Mie
,
Y. Ikeda
3   From the Division of Hematology, Department of Internal Medicine, Keio University School of Medicine, Tokyo, Japan
,
I. Yada
1   From the Department of Thoracic and Cardiovascular Surgery, Edobashi, Tsu, Mie
› Author Affiliations
Further Information

Publication History

Received 08 December 1997

Accepted after resubmission 13 May 1998

Publication Date:
08 December 2017 (online)

Summary

Alterations in platelet aggregability may play a role in the pathogenesis of qualitative platelet defects associated with cardiopulmonary bypass (CPB). We circulated fresh heparinized whole blood through tubing sets coated with heparin (C group, n = 10) and through non-coated sets (N group, n = 10) as a simulated CPB circuit. Shear stress (108 dyne/cm2)-induced platelet aggregation (hSIPA), plasma von Willebrand factor (vWF) activity and platelet glycoprotein (GP) Ib expression were measured, before, during, and after this in vitro set up of circulation. In the two groups, the extent of hSIPA significantly decreased during circulation and was partially restored after circulation. Decreases in the extent of hSIPA were significantly less with use of heparin-coated circuits. There was an equivalent reduction in plasma vWF activity, in the two groups. Expression of platelet surface GP Ib decreased significantly during circulation and recovered after circulation. Reduction of surface GP Ib expression during circulation was significantly less in the C group than that in the N group. Decrease in surface GP Ib expression correlated (r = 0.88 in either group) with the magnitude of hSIPA, in the two groups. The progressive removal of surface GP Ib was mainly attributed to redistribution of GP Ib from the membrane skeleton into the cytoskeleton. Our observations suggest that use of heparin-coated circuits partly blocks the reduction of hSIPA, as a result of a lesser degree of redistribution of GP Ib.

 
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