Danish Aspirin Resistance Trial - Pilot Study
Despite treatment with aspirin a large number of patients suffer a myocardial infarction. It has been speculated that these patients might be "resistant" to aspirin, and studies have indicated that this phenomenon is related to a less favourable prognosis. At present, no international consensus exists on how to measure "aspirin resistance". The purpose of this study is to compare different methods for detecting "aspirin resistance". A classic but cumbersome way of evaluating platelet function will be compared to newer, easy-handling point-of-care tests. We hypothesize that one or more point-of-care tests will prove to be superior to the classic platelet function test in detecting aspirin resistance.
|Study Design:||Allocation: Non-Randomized
Endpoint Classification: Pharmacodynamics Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic
|Official Title:||Comparative Evaluation of Aspirin Resistance With Point-of-Care Testing - Danish Aspirin Resistance Trial (DANART) - Pilot Study|
- Platelet aggregation (as determined by 3 point-of-care tests and by serum-thromboxane A2 + urine 11-dehydro thromboxane B2) is measured once daily for 4 days after one week of treatment with aspirin 75 mg/day
|Study Start Date:||November 2006|
|Study Completion Date:||March 2007|
Platelets play a major role in arterial thrombus formation - the cause of cardiovascular death, acute myocardial infarction and ischemic stroke and the number one killer in the Western World. Binding the COX enzyme platelet aggregation is inhibited by aspirin, and as prophylaxis against death, myocardial infarction and stroke aspirin is the most widely used drug worldwide. Low dose aspirin has been shown to improve outcome in patients with ischemic heart disease, but approximately 12% of these patients will suffer from a vascular event during a 2 year follow-up period despite aspirin therapy. It has been speculated that these patients might be "resistant" to the antiaggregatory effect of aspirin, and a diminished response to aspirin has been correlated with a less favourable outcome. However, at present no international consensus exists on how to measure "aspirin resistance".
Comparisons: The platelet aggregation in patients with ischemic heart disease on chronic, low dose aspirin is compared to platelet aggregation i healthy volunteers evaluated with different tests. The traditional way of evaluating platelet function, Platelet Aggregometry a.m. Born, will be compared to 3 point-of-care tests (VerifyNow, PFA-100 and Multiplate Whole Blood Aggregometer) and to urin- and serum thromboxane metabolites as a measure of COX inhibition.
|Department of Cardiology, Skejby Sygehus, Aarhus University Hospital|
|Aarhus, Denmark, 8200|
|Study Director:||Steen D Kristensen, MD, DMSc||Department of Cardiology, Skejby Sygehus, Aarhus University Hospital, 8200 Aarhus N, DK - Denmark|
|Principal Investigator:||Erik L Grove, MD||Department of Cardiology, Skejby Sygehus, Aarhus University Hospital, 8200 Aarhus N, DK - Denmark|