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Title: Heparin-induced thrombocytopenia platelet aggregation studies in the presence of heparin fractions or semi-synthetic analogues of various molecular weights and anticoagulant activities
Authors: Blockmans, Daniel Engelbert ×
Bounameaux, H
Vermylen, Jozef
Verstraete, Marc #
Issue Date: May-1986
Series Title: Thrombosis and haemostasis vol:55 issue:1 pages:90-3
Abstract: One case of heparin-induced thrombocytopenia is reported. Aggregation was observed in the platelet-rich plasma of this patient in the presence of two commercial standard heparin preparations (from a final concentration of 0.025 IU/ml upwards), of two semi-synthetic heparin analogues (0.1 APTT U/ml) and of three low-molecular weight heparin (LMWH) fractions (0.1 anti-Xa U/ml) but not in the presence of five other LMWH fractions. The patient's isolated platelets no longer aggregated in the The patient's isolated platelets no longer aggregated in the presence of heparin but the phenomenon recurred after addition of the patient's platelet poor plasma (PPP). Furthermore, addition of patient's PPP to control platelets led to heparin-induced aggregation. The phenomenon was associated with thromboxane generation and could be blocked by in vitro addition of aspirin, PGI2, and PGD2 whereas the lag phase was dose-dependently prolonged by adenosine. It is concluded that platelet aggregation may be induced in some patients by standard heparin and by certain LMWH fractions or semi-synthetic analogues, independently of their molecular weight and anticoagulant activity.
ISSN: 0340-6245
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Molecular and Vascular Biology
Faculty of Medicine - miscellaneous
Laboratory for Clinical Infectious and Inflammatory Disorders
× corresponding author
# (joint) last author

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