PMID- 8388358 OWN - NLM STAT- MEDLINE DCOM- 19930621 LR - 20180216 IS - 0301-0147 (Print) IS - 0301-0147 (Linking) VI - 23 Suppl 1 DP - 1993 Mar TI - Antithrombotic activity and its relationship to in vitro anticoagulant effects. PG - 99-102 AB - Antithrombotic activities of low molecular weight heparins (LMWHs) in a venous stasis thrombosis model, when compared to unfractionated heparin (UFH), correlated better with anti-IIa activities and inhibition of thrombin generation than with anti-Xa activities. The relative antithrombotic potencies of LMWHs were closer to inhibitory activity in thrombin generation with platelet-poor plasma than platelet-rich plasma. Comparing activities in intrinsic and extrinsic systems, higher concentrations of heparins were required in vitro to inhibit intrinsic thrombin generation than extrinsic thrombin production; however, higher doses were required to prevent in vivo thrombotic events initiated via the extrinsic pathway. FAU - Gray, E AU - Gray E AD - National Institute for Biological Standards and Control, Potters Bar, Herts, UK. FAU - Padilla, A AU - Padilla A FAU - Barrowcliffe, T W AU - Barrowcliffe TW LA - eng PT - Comparative Study PT - Journal Article PL - Switzerland TA - Haemostasis JT - Haemostasis JID - 0371574 RN - 0 (Anticoagulants) RN - 0 (Factor Xa Inhibitors) RN - 0 (Fibrinolytic Agents) RN - 0 (Heparin, Low-Molecular-Weight) RN - 9001-26-7 (Prothrombin) RN - 9002-04-4 (Factor IIa) RN - 9005-49-6 (Heparin) RN - EC 3.4.21.5 (Thrombin) SB - IM MH - Animals MH - Anticoagulants/*pharmacology MH - Dose-Response Relationship, Drug MH - Factor Xa Inhibitors MH - Fibrinolytic Agents/*pharmacology MH - Heparin/pharmacology/therapeutic use MH - Heparin, Low-Molecular-Weight/*pharmacology/therapeutic use MH - Prothrombin/antagonists & inhibitors MH - Rabbits MH - Thrombin/biosynthesis MH - Thrombophlebitis/prevention & control EDAT- 1993/03/01 00:00 MHDA- 1993/03/01 00:01 CRDT- 1993/03/01 00:00 PHST- 1993/03/01 00:00 [pubmed] PHST- 1993/03/01 00:01 [medline] PHST- 1993/03/01 00:00 [entrez] AID - 10.1159/000216916 [doi] PST - ppublish SO - Haemostasis. 1993 Mar;23 Suppl 1:99-102. doi: 10.1159/000216916.