title: Characterization of a new potent heparin. 1 communication: Determinations of anticoagulant activity of a high potency heparin preparation in vivo using dog as an experimental animal and in vitro using dog and human plasma.
abstract: The anticoagulant effect of a highly potent heparin preparation was compared with a commercially available heparin in vivo after i.v. application in beagle dogs. The anticoagulant activity was determined using thrombin time, activated partial thromboplastin time and whole blood clotting time 5, 10 and 30 min after application. The relative potency of the heparin preparation (Schering) was found to be 1.62 to 2.52 times higher than heparin used for comparison (150 USP units/mg). The anticoagulant properties of both preparations were also studied in vitro using heparin concentrations from 0.44 to 7.0 microgram/ml dog and human plasma. The relative potency in vitro experiments using dog or human plasma were 1.62 and 1.63, respectively, on the basis of activated partial thromboplastin time. It was further demonstrated that the anticoagulant effect as determined by activated partial thromboplastin time in vitro on human plasma was 2 to 2.4 times more pronounced in both heparin preparations when compared to the effect exerted on dog plasma.
mesh_terms: D000818:Animals; D000925:Anticoagulants; D004285:Dogs; D004305:Dose-Response Relationship, Drug; D006493:Heparin / Q000097:blood / Q000494:pharmacology*; D006801:Humans; D066298:In Vitro Techniques; D010314:Partial Thromboplastin Time; D013045:Species Specificity; D013918:Thrombin Time
chemical_list: D000925:Anticoagulants; D006493:Heparin