Track topics on Twitter Track topics that are important to you
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.
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.
Allocation: Randomized, Endpoint Classification: Efficacy Study, Intervention Model: Crossover Assignment, Masking: Double Blind (Subject, Investigator), Primary Purpose: Treatment
Coronary Artery Disease
Leviev Heart Center, Sheba Medical Center
Not yet recruiting
Sheba Medical Center
Published on BioPortfolio: 2014-08-27T03:17:51-0400
It would be useful to study coronary arteriovenous difference of various markers in patients who are undergoing coronary angiography for suspected coronary artery disease. Environmental an...
Coronary artery disease is the leading cause of death in USA. Contemporary cardiac care has substantially reduced mortality and morbidity in patients with severe coronary artery disease. H...
To determine if prasugrel is superior to clopidogrel in providing adequate antiplatelet effect in a high risk population that requires concomitant use of a Proton Pump Inhibitor (PPI).
The purpose of this study is to determine whether coronary artery CT scanning or nuclear stress testing is better at diagnosing chest pain patients with known coronary artery disease to se...
The aim of the present study is to identify factors (such as symptom patterns and symptom scores) that influence the response to treatment with pantoprazole using different evaluation meth...
To assess sex-specific differences regarding use of conventional risks and coronary artery calcification (CAC) to detect coronary artery disease (CAD) using coronary CT angiography (CCTA).
Cardiovascular disease (CVD) is the major cause of mortality worldwide. Coronary artery disease (CAD) contributes to half of mortalities caused by CVD. The mainstay of management of CAD is medical the...
BACKGROUND AND OBJECTIVE: An increasing trend in prescribing proton pump inhibitors (PPIs) inevitably increases the risk of unwanted drug-drug interactions (DDIs). The aim of this study was to uncove...
Long-term patient and kidney survival after coronary artery bypass grafting, percutaneous coronary intervention, or medical therapy for patients with chronic kidney disease: a propensity-matched cohort study.
Revascularization in patients with chronic kidney disease (CKD) and coronary artery disease (CAD) is often deferred because of concern over progression of renal failure.
Endothelial dysfunction and coronary artery calcification (CAC) may represent two distinct and separate processes in the development of coronary atherosclerosis. However, the interaction between these...
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.
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.
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.
A congenital coronary vessel anomaly in which the left main CORONARY ARTERY originates from the PULMONARY ARTERY instead of from AORTA. The congenital heart defect typically results in coronary artery FISTULA; LEFT-SIDED HEART FAILURE and MITRAL VALVE INSUFFICIENCY during the first months of life.
Pathological processes of CORONARY ARTERIES that may derive from a congenital abnormality, atherosclerotic, or non-atherosclerotic cause.
The Top 100 Pharmaceutical Companies
Top 10 biotech and pharmaceutical companies worldwide based on market value in 2015 2015 ranking of the global top 10 biotech and pharmaceutical companies based on revenue (in billion U.S. dollars) Johnson & Johnson, U.S. 74...
Health care (or healthcare) is the diagnosis, treatment, and prevention of disease, illness, injury, and other physical and mental impairments in humans. Health care is delivered by practitioners in medicine, chiropractic, dentistry, nursing, pharmacy, a...