Clopidogrel Proton-Pump Inhibitors Study
Summary
To find out the impact of two different proton-pump inhibitors (PPIs) (Omeprazole and Pantoprazole) on platelet function in patients with stable coronary artery disease (CAD) on clopidogrel therapy.
Description
On June 19, 2009 The European Medicines Agency (EMEA) has issued a public statement on a possible interaction between clopidogrel (Plavix, Sanofi-Aventis/Bristol-Myers Squibb)and proton-pump inhibitors (PPIs) and has recommended that the product information for all clopidogrel-containing medicines be amended to discourage concomitant use of PPIs unless absolutely necessary. The UK medicines regulator, the Medicines and Healthcare Products Regulatory Agency (MHRA), has also issued advice to GPs that concomitant use of a PPI with clopidogrel is not recommended unless considered essential, urging a review of the prescribing of PPIs at the next appointment for patients taking clopidogrel. This follows an "early communication" issued by the US FDA earlier this year, stating that PPIs might interfere with the effectiveness of clopidogrel and that clinicians should reevaluate starting or continuing treatment with a PPI in patients taking clopidogrel.
There is a concern that the studies on which these warnings are based have many limitations and that it is far from certain whether there really is an interaction between clopidogrel and PPIs.
Another point of uncertainty is whether there may be a difference between individual PPIs, with some pharmacodynamic studies suggesting an interaction with omeprazole but not with pantoprazole. The clinical evidence, however, is conflicting. There has been one clinical trial from Canada suggesting an interaction with omeprazole but not with pantoprazole. From a mechanistic view it is known that omeprazole is metabolized by the CYP219 enzyme, which converts clopidogrel into its active metabolite. And while pantoprazole can also be metabolized by this enzyme, it also uses other routes.
Thus, the primary goal of the current study is to find out the impact of two different PPIs (Omeprazole, Losec, and Pantoprazole) on platelet function in patients with stable coronary artery disease (CAD) on clopidogrel therapy.
Forty patients with stable CAD will be randomized to receive either omeprazole tables (Losec, 40 mg/day, Abic Inc., Israel) or pantoprazole tables (Controloc 40, 40 mg/day, Nycomed, Perrigo Inc., Israel) for 1 month (Phase 1), followed by a 4-week washout period, and the alternative treatment for 1 month (Phase 2).Platelet function tests will be assessed 4 times: before and after each study phase. Following an overnight fast, ECG and blood tests for measurements of platelet function, lipids, blood cell count, electrolytes, fasting glucose, and high-sensitivity C-reactive protein (hs-CRP), will be performed. The blood samples, except those for platelet function, will be centrifuged immediately for 15 minutes at 3000/min. The sera will be stored at -20° C, and will be tested at the end of the study. Blood samples for platelet function will be assessed immediately after the blood is drawn. All blood samples will be evaluated in the same laboratory and by the same operator who will be blinded to the patients' clinical status and PPIs allocation.
All patients will be instructed to continue taking their regular medications throughout the study period. In addition, patients will be instructed not to add any medications (including over the counter medications) and to record any change in concomitant medications throughout the study period.
Study Design
Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Investigator), Primary Purpose: Treatment
Conditions
Coronary Artery Disease
Intervention
Omeprazole, Pantoprazole
Location
Leviev Heart Center, Sheba Medical Center
Tel Hashomer
Israel
52621
Status
Not yet recruiting
Source
Sheba Medical Center
Results (where available)
Links
- Source: http://clinicaltrials.gov/show/NCT01016717
- Information obtained from ClinicalTrials.gov on July 15, 2010
Medical and Biotech [MESH] Definitions
Coronary Artery Bypass
Surgical therapy of ischemic coronary artery disease achieved by grafting a section of saphenous vein, internal mammary artery, or other substitute between the aorta and the obstructed coronary artery distal to the obstructive lesion.
Internal Mammary-coronary Artery Anastomosis
Direct myocardial revascularization in which the internal mammary artery is anastomosed to the right coronary artery, circumflex artery, or anterior descending coronary artery. The internal mammary artery is the most frequent choice, especially for a single graft, for coronary artery bypass surgery.
Coronary-subclavian Steal Syndrome
A complication of INTERNAL MAMMARY-CORONARY ARTERY ANASTOMOSIS whereby an occlusion or stenosis of the proximal SUBCLAVIAN ARTERY causes a reversal of the blood flow away from the CORONARY CIRCULATION, through the grafted INTERNAL MAMMARY ARTERY (internal thoracic artery), and back to the distal subclavian distribution.
Coronary Artery Disease
Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause.
Gastroepiploic Artery
Abdominal artery that follows the curvature of the stomach. The right gastroepiploic artery is frequently used in CORONARY ARTERY BYPASS GRAFTING; MYOCARDIAL REVASCULARIZATION, and other vascular reconstruction.
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PubMed Articles
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