Antithrombotic effect of ticlopidine in an experimental model of retinal vein occlusion.
PURPOSE: Ticlopidine inhibits adenosine diphosphate (ADP)-induced platelet aggregation and may be effective in patients with retinal vein occlusions (RVO). This study tests the efficacy of ticlopidine in an animal model of RVO. METHODS: Rose bengal-mediated argon laser photothrombosis of retinal veins was created in rabbits pretreated with oral ticlopidine, aspirin, or saline. The number of laser spots necessary to produce a partial or complete RVO was recorded and tabulated. RESULTS: Pretreatment with ticlopidine significantly increased the number of laser spots needed to produce a partial (P =.02), or a complete (P =.002) RVO as compared to the control group. Pretreatment with ticlopidine significantly increased the number of laser spots needed to produce a partial RVO (P =.02). Pretreatment with aspirin significantly increased the number of laser spots needed to produce a complete RVO (P =.002). CONCLUSION: Ticlopidine may be a useful antiplatelet agent for the treatment of patients with RVO. Patients treated with ticlopidine should be monitored for the possible development of hematologic disorders.
Arroyo, JG; Dastgheib, K; Hatchell, DL
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