PMID- 6740557 OWN - NLM STAT- MEDLINE DCOM- 19840813 LR - 20041117 IS - 0340-6245 (Print) IS - 0340-6245 (Linking) VI - 51 IP - 2 DP - 1984 Apr 30 TI - High and low affinity heparin compared with unfractionated heparin as antithrombotic drugs. PG - 254-6 AB - A preparation of heparin was separated by affinity chromatography into two fractions: one of high ( HAH ) and the other of low (LAH) affinity to antithrombin III. These two fractions were compared with unfractionated heparin ( UFH ) by in vitro assay and their ability to impair experimental stasis thrombosis was also examined. Although the in vitro activity of HAH was double that of UFH , HAH was less effective than UFH as an antithrombotic drug; LAH was virtually inactive, both in vitro and in vivo. A mixture of 30 micrograms/kg of HAH and 50 micrograms/kg of LAH was as effective in preventing thrombosis as 80 micrograms/kg of UFH , and was more effective than 40 micrograms/kg of HAH alone, demonstrating that LAH potentiates the action of HAH in vivo. FAU - Merton, R E AU - Merton RE FAU - Thomas, D P AU - Thomas DP FAU - Havercroft, S J AU - Havercroft SJ FAU - Barrowcliffe, T W AU - Barrowcliffe TW FAU - Lindahl, U AU - Lindahl U LA - eng PT - Journal Article PL - Germany TA - Thromb Haemost JT - Thrombosis and haemostasis JID - 7608063 RN - 9005-49-6 (Heparin) SB - IM MH - Animals MH - Blood Coagulation/*drug effects MH - Chromatography, Affinity/*methods MH - Dose-Response Relationship, Drug MH - Heparin/*analysis/pharmacology MH - Humans MH - Partial Thromboplastin Time MH - Rabbits MH - Thrombosis/prevention & control EDAT- 1984/04/30 00:00 MHDA- 1984/04/30 00:01 CRDT- 1984/04/30 00:00 PHST- 1984/04/30 00:00 [pubmed] PHST- 1984/04/30 00:01 [medline] PHST- 1984/04/30 00:00 [entrez] PST - ppublish SO - Thromb Haemost. 1984 Apr 30;51(2):254-6.