Heparin lowers plasma levels of activated factor VII

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Abstract

Based on heparin's antithrombin and anti-FXa activity and its in vitro inhibition of activated factor VII (FVIIa) activity, we hypothesized that unfractionated heparin (UFH) may decrease plasma levels of FVIIa in humans. Therefore, 10 healthy young male volunteers received an intravenous UFH infusion over 24h. Heparin decreased FVIIa levels by 30% (95% CI 14-47%) at 12 h, which was sustained until 24 h. In contrast, neither the substrate pool (i.e. total factor VII) as measured by FVII antigen nor FVII activity were affected by UFH. These results may improve our understanding of the regulation of FVIIa levels and heparin's mode of action.

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Pernerstorfer, T., Jilma, B., Eichler, H. G., Aull, S., Handler, S., & Speiser, W. (1999). Heparin lowers plasma levels of activated factor VII. British Journal of Haematology, 105(4), 1127–1129. https://doi.org/10.1046/j.1365-2141.1999.01473.x

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