ORIGINAL ARTICLESEffects of different doses, enteric-coated preparation of aspirin, and sex on urinary 11-dehydrothromboxane B2 in healthy volunteersDharmasaroja, Pornpatr Aa; Sae-Lim, SuvarapornbAuthor Information aDivision of Neurology, Department of Internal Medicine, Thailand bResearch Unit, Faculty of Medicine, Thammasat University, Klong Luang, Pathumthani, Thailand Received 26 March, 2010 Revised 18 May, 2010 Accepted 5 June, 2010 Correspondence to Dr Pornpatr A. Dharmasaroja, MD, Assistant Professor in Neurology, Division of Neurology, Faculty of Medicine, Thammasat University, Klong 1, Klong Luang, Pathumthani 12120, Thailand Tel: +66 86 5881734; fax: +66 2 9269793; e-mail: [email protected] Blood Coagulation & Fibrinolysis: October 2010 - Volume 21 - Issue 7 - p 649-652 doi: 10.1097/MBC.0b013e32833cea2c Buy Metrics Abstract There is scarce information about the effects of different doses and enteric-coated preparation of aspirin on platelet function, especially in Asian people, evaluated by the measurement of urinary 11-dehydrothromboxane B2 (dTXB2). The objective of the present study was to assess the effects of different doses, enteric-coated preparation of aspirin, sex and also the effects of timing of urine collection on urinary dTXB2 level in healthy volunteers. Thirty healthy volunteers were included. Each volunteer took three preparations of aspirin (aspirin 81 mg, enteric-coated aspirin 300 mg and aspirin 300 mg) for 7 days. Urine dTXB2 level was measured at baseline, day 3, and day 7 after taking each preparation of aspirin. There was no significant difference in the effects of different doses of aspirin (81 vs. 300 mg, 50.7 vs. 61.8 ng/mmol creatinine, P = 0.248), preparations (enteric-coated vs. nonenteric-coated aspirin, 61.8 vs. 67.9 ng/mmol creatinine, P = 0.527) and time of urine collection (day 3 vs. day 7, 51.7 vs. 49.9 ng/mmol creatinine, P = 0.448). Female volunteers showed a trend to have higher urinary dTXB2 than male volunteers at baseline and after taking aspirin. This study showed no significant difference in urinary dTXB2 level after taking different doses and enteric-coated preparation of aspirin in healthy volunteers. © 2010 Lippincott Williams & Wilkins, Inc.