Abstract
The antithrombotic effects of the xanthine derivative propentofylline (HWA 285) were investigated in the laser-induced thrombus model in healthy and diseased rat mesenteric arterioles. Laser-induced platelet thrombi were documented by the help of an intravital microscope and a video system. The statistical comparison of drug-treated and untreated animals, in respect to the number of laser shots necessary to induce a defined thrombus, served as a quantitative measure for a potential antithrombotic drug effect. Propentofylline and acetylsalicylic acid, in single dosages of 10 and 30 mg/kg orally, significantly increased the number of laser shots required to produce a defined thrombus. Moreover, the drug decreased the laser-induced thrombus formation in a chronic experiment in adjuvant arthritic rats. After oral administration of 30 mg/kg for 21 days, propentofylline and pentoxifylline reduced significantly the thrombus formation, whereas acetylsalicylic acid exerted no effect.
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