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- W2000448037 abstract "Concern has recently been raised over the possibility of a reduced efficacy of clopidogrel because of genetic variations in cytochrome P450, family 2, subfamily C, polypeptide 19 (CYP2C19) metabolism. A black box warning from the US Food and Drug Administration recommends that all patients be tested. It has been estimated that approximately 3% (range 2-14%) of the population are poor metabolizers, but few data are available for cerebrovascular patients. The objective of this study is to evaluate the frequency and effects of variability in CYP2C19 metabolism in patients with cerebrovascular disease.A retrospective review of all patients with stroke and transient ischemic attack (TIA) tested for the clopidogrel CYP2C19 genotype was performed, with a collection of data including race/ethnicity, CYP2C19 status, and the presence of recurrent vascular events.A total of 53 cerebrovascular patients were tested, consisting of 5.7% poor (n = 3), 26.4% intermediate (n = 14), 62.3% extensive (n = 33), 3.8% indeterminate (n = 2), and 1.9% mixed ultra rapid and poor (n = 1) metabolizers. Only 10 of 38 white patients (26.3%; 95% confidence interval [CI] 0.14-0.42) were intermediate or poor metabolizers, compared with 7 of 15 (46.7%; 95% CI 0.25-0.70) nonwhites. Of 43 patients treated with clopidogrel, 3 of 27 extensive metabolizers (11.1%; 95% CI 0.04-0.28) had recurrent cerebrovascular events compared with 33.3% of intermediate metabolizers (4/12; 95% CI 0.14-0.61) and 50% of poor metabolizers (1/2; 95% CI 0.09-0.90).These data suggest that the proportion of poor/intermediate clopidogrel metabolizers in cerebrovascular patients is comparable to cardiovascular studies and these patients may have an increased risk of recurrent cerebrovascular events. Routine CYP2C19 testing may be warranted." @default.
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- W2000448037 date "2014-04-01" @default.
- W2000448037 modified "2023-09-30" @default.
- W2000448037 title "Reduced Clopidogrel Metabolism in a Multiethnic Population: Prevalence and Rates of Recurrent Cerebrovascular Events" @default.
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- W2000448037 doi "https://doi.org/10.1016/j.jstrokecerebrovasdis.2013.06.008" @default.
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