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- W2077807564 abstract "Background: Evaluation of clopidogrel therapy by in vitro methods has limitations which may be of clinical importance. We wanted to explore the variability in aggregometry response in aspirin sensitive patients before and after initiation of clopidogrel therapy. Methods: ADP 9.37 μM, AA 1.2mM and TRAP 25mM stimulated light transmissions aggregometry (LTA) were performed twice before (Exams 1 and 2; 3 weeks apart)-and within one year after-initiation of clopidogrel therapy (Exam 3) in 79 patients treated with PCI. Repeated ADP aggregometry was also performed in 16 healthy volunteers in order to estimate LTA measurement error. Result:. Inter-individual differences in ADP aggregation e.g. at Exam 1 were substantial (range 17–77%, SD 15.8%). Intra-individual changes between Exams 1 and 2 were significant (−27 to +36%, SD 14.6%, p<0.05). Inter-individual differences at Exam 3 (on clopidogrel treatment) were larger than expected from Exams 1 and 2 (p<0.01). AA aggregation was the same before and during clopidogrel treatment. In controls, inter-individual differences were smaller at ADP 10 than at ADP 5μM. Conclusions. Inter-individual differences in ADP aggregation were significant both before and during clopidogrel therapy, and there were significant intra-individual variations over time. Therefore, prediction of aggregometry response before or during clopidogrel therapy based on single tests may be unreliable. Inter-individual differences in healthy controls are smaller at high concentrations of ADP, and comparisons of aggregometry response should be performed with caution unless ADP concentrations are standardized." @default.
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- W2077807564 date "2009-01-01" @default.
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- W2077807564 title "Variability in aggregometry response before and after initiation of clopidogrel therapy" @default.
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- W2077807564 doi "https://doi.org/10.3109/00365510902971875" @default.
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