Incomplete inhibition of thromboxane biosynthesis by acetylsalicylic acid: Determinants and effect on cardiovascular risk

Eikelboom, John W., Hankey, Graeme J., Thom, Jim, Deepa, L., Bhatt, P., Steg, Gabriel, Montalescot, Gilles, Johnston, S. Claiborne, Steinhubl, Steven R., Mak, Koon-Hou, Hamm, Christian, Hu, Tingfei, Fox, Keith A.A., Topol, Eric J., Walker, Philip J. and Clopidogrel for High Atherothrombotic Risk and Ischemic Stabilization, Management and Avoidance (CHARISMA) Investigators (2008) Incomplete inhibition of thromboxane biosynthesis by acetylsalicylic acid: Determinants and effect on cardiovascular risk. Circulation, 118 17: 1705-1712. doi:10.1161/CIRCULATIONAHA.108.768283


Author Eikelboom, John W.
Hankey, Graeme J.
Thom, Jim
Deepa, L.
Bhatt, P.
Steg, Gabriel
Montalescot, Gilles
Johnston, S. Claiborne
Steinhubl, Steven R.
Mak, Koon-Hou
Hamm, Christian
Hu, Tingfei
Fox, Keith A.A.
Topol, Eric J.
Walker, Philip J.
Clopidogrel for High Atherothrombotic Risk and Ischemic Stabilization, Management and Avoidance (CHARISMA) Investigators
Title Incomplete inhibition of thromboxane biosynthesis by acetylsalicylic acid: Determinants and effect on cardiovascular risk
Journal name Circulation   Check publisher's open access policy
ISSN 0009-7322
1524-4539
Publication date 2008-10-06
Sub-type Article (original research)
DOI 10.1161/CIRCULATIONAHA.108.768283
Open Access Status
Volume 118
Issue 17
Start page 1705
End page 1712
Total pages 8
Place of publication United States
Publisher Lippincott, Williams & Wilkins for the American Heart Association
Language eng
Subject 111502 Clinical Pharmacology and Therapeutics
Formatted abstract
Background: 
Incomplete inhibition of platelet thromboxane generation, as measured by elevated urinary 11-dehydro thromboxane B2 concentrations, has been associated with an increased risk of cardiovascular events. We aimed to determine the external validity of this association in aspirin-treated patients enrolled in the Clopidogrel for High Atherothrombotic Risk and Ischemic Stabilization, Management and Avoidance (CHARISMA) trial and to determine whether there are any modifiable factors or interventions that lower urinary 11-dehydro thromboxane B2 concentrations that could thereby reduce cardiovascular risk.
Methods and Results: 
Urinary 11-dehydro thromboxane B2 concentrations were measured in 3261 aspirin treated patients at least 1 month after they had been randomly assigned to placebo or clopidogrel. Baseline urinary 11-dehydro thromboxane B2 concentrations in the highest quartile were associated with an increased risk of stroke, myocardial infarction, or cardiovascular death compared with the lowest quartile (adjusted hazard ratio 1.66, 95% CI 1.06 to 2.61, P0.03). Increasing age, female sex, history of peripheral artery disease, current smoking, and oral hypoglycemic or angiotensin-converting enzyme inhibitor therapy were independently associated with higher urinary concentrations of 11-dehydro thromboxane B2, whereas aspirin dose 150 mg/d, history of treatment with nonsteroidal antiinflammatory drugs, history of hypercholesterolemia, and statin treatment were associated with lower concentrations. Randomization to clopidogrel (versus placebo) did not reduce the hazard of cardiovascular events in patients in the highest quartile of urinary 11-dehydro thromboxane B2 levels.

Conclusions: 
In aspirin-treated patients, urinary concentrations of 11-dehydro thromboxane B2 are an externally valid and potentially modifiable determinant of stroke, myocardial infarction, or cardiovascular death in patients at risk for atherothrombotic events. 
Keyword Aspirin
Aspirin resistance
Atherosclerosis
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
ERA 2012 Admin Only
School of Medicine Publications
 
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Created: Tue, 02 Feb 2010, 10:32:00 EST by Christine Ouslinis on behalf of Faculty Of Health Sciences