Antithrombotic effects of the prostacyclin analogue naxaprostene after oral and intraduodenal application in rabbit carotid artery thrombosis

The antithrombotic efficacy of the prostacyclin analogue naxaprostene has been tested in rabbits with copper coil-induced carotid artery thrombosis. With oral pretreatment, 10 mg/kg naxaprostene prevented thrombotic arterial occlusion; with intraduodenal pretreatment the efficacy of naxaprostene was enhanced and 1 mg/kg was sufficient to exert an antithrombotic effect. The final average carotid blood flow at 180 min compared to the flow immediately before thrombus induction was 85 +/- 25% and 47 +/- 18% in Animals treated with 10 mg/kg p.o. resp. 1 mg/kg i.d. naxaprostene. Parallel to the antithrombotic effect, naxaprostene inhibited ADP- and collagen-induced fall in circulating platelets. In anesthetized rabbits there was no dissociation between antithrombotic and hypotensive effects of naxaprostene.