Abstract
Inherited platelet cyclo-oxygenase (COX) deficiency is a rare bleeding disorder. We report here the first case of familial type 2 platelet COX deficiency responsible for a moderate bleeding phenotype. The propositus was admitted in the emergency department for major epistaxis following treatment with aspirin. Epinephrine closure time is very sensitive to drugs which inhibit COX but the test was normal in patients with inherited COX deficiency. This clinical and biological data suggest that the anti-platelet effect of aspirin may be dependent on mechanisms other than the inhibition of COX. Thrombin generation test confirmed mild bleeding phenotype in patients with COX deficiency as they had normal thrombin generating capacity.
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