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Serum TXB2: A Case Study

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Serum TXB2: A Case Study
Serum TXB2was uniformly suppressed by 99% of baseline. Urinary 11-dehydro-TXB2, arachidonic acid-induced aggregation, and VerifyNow Aspirin (Accumetrics Inc., San Diego, California) showed stable, incomplete inhibition (65%, 80%, and 35%, respectively). Adenosine diphosphate- and collagen-induced aggregation was highly variable and poorly affected by aspirin, with an apparent time-dependent reversal. Inhibition of platelet cyclooxygenase activity was nonlinearly related to inhibition of platelet aggregation. Platelet function largely recovered by day 3 post-aspirin, independently of treatment duration. With any functional assay, occasionally "resistant" subjects were found to be "responders" on previous or subsequent determinations.
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