Influence Of Omeprazole On The Anti-Platelet Action Of Clopidogrel

Study Overview
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Brief Summary
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Objectives: A prospective investigation of the effect of omeprazole, a proton pump inhibitor, on the anti-platelet action of clopidogrel. The main decision criterion will concern change in VASP protein phosphorylation under treatment. Phosphorylation will be measured before and after administration of omeprazole versus placebo in patients undergoing clopidogrel treatment. Type of study: Single center, double blind, randomized parallel group study versus placebo, comparing two treatment groups: clopidogrel + omeprazole + standard regime (beta-blockers, atorvastatin, IEC, aspirin) clopidogrel + placebo+ standard regime (beta-blockers, atorvastatin, IEC, aspirin) Study population: 120 patients from the Cardiology Department of Brest University hospital, Brest (France), receiving a standard treatment comprising a loading dose of clopidogrel followed by a daily dose of 75 mg associated to 75 mg aspirin, will be randomized between 20 mg/day omeprazole and 20 mg/day placebo treatment groups. The efficacy of clopidogrel will be assessed by inter-group comparison on the VASP test. Study period: 7 days' treatment per patient. Total study period estimated at 6 months. Expected findings: The results should confirm the suspected negative effect of omeprazole on clopidogrel's impact on arterial thrombosis risk, secondarily allowing new recommendations to be drawn up for this association.

Detailed Description
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Preventing recurrence of thrombosis following angioplasty relies on dual-therapy associating the anti-platelet agents aspirin and clopidogrel. This regime is kept up for between 1 and 6 months, depending on the type of stent deployed in the angioplasty. The biological effectiveness of the clopidogrel treatment can be assessed by the VASP test, a new platelet test, results on which have been shown to correlate with risk of thrombosis. A study we ran recently strongly suggested that omeprazole was associated with a poor response to clopidogrel. Omeprazole is an anti-ulcer agent frequently prescribed to prevent unwanted side-effects of aspirin, making it frequently associated to clopidogrel in the aftermath of angioplasty. Study population: 120 patients from the Cardiology Department of Brest University hospital, Brest (France), receiving a standard treatment comprising a loading dose of clopidogrel followed by a daily dose of 75 mg associated to 75 mg aspirin, will be randomized between 20 mg/day omeprazole and 20 mg/day placebo treatment groups. The efficacy of clopidogrel will be assessed by inter-group comparison on the VASP test. Study period: 7 days' treatment per patient. Total study period estimated at 6 months.

Official Title
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Influence Of Omeprazole On The Anti-Platelet Action Of Clopidogrel Associated To Aspirin: Double-Blind Randomized Trial Against Placebo

Conditions
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Coronary Heart Disease

Intervention / Treatment
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* Drug: impact on VASP test


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: patient with indication of aspirin and clopidogrel treatment Exclusion Criteria: patient<18 years liver disease drug eluting stent gastrointestinal ulcus bleeding pregnancy

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 85 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double


Arms and Interventions

| Intervention/Treatment |
| --- |
|Drug: impact on VASP test|nan|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| inter group comparison of VASP test |  |  | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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clopidogrel, omeprazole