A low molecular weight heparin compared with unfractionated heparin |
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Authors: | Duncan P Thomas Rosemary E Merton |
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Institution: | National Institute for Biological Standards and Control, Holly Hill, London NW3 6RB, England |
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Abstract: | A 6000 daltons low molecular weight heparin (LMWH) was compared with unfractionated mucosal heparin in vitro and in vivo. Despite unimpressive specifications by clotting assays in vitro, the LMWH gave high and sustained activity in vivo by anti-Factor Xa assays, following subcutaneous injection. However, activity measured by APTT and calcium thrombin time assays was at least as high as occurred following unfractionated heparin. On the basis of clotting assays, there seems no reason to expect a lower incidence of haemorrhagic side-effects following the clinical use of this LMWH. The study also strikingly demonstrates the inadequacy of in vitro clotting assays for assessing the in vivo behaviour of LMWH. |
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Keywords: | Heparin low molecular weight heparin |
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