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Danish Aspirin Resistance Trial - Pilot Study

This study has been completed.
Danish Research Agency
Information provided by:
University of Aarhus Identifier:
First received: October 17, 2006
Last updated: December 10, 2007
Last verified: December 2007
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.

Condition Intervention
Drug Resistance
Drug: acetylsalicylic acid

Study Type: Interventional
Study Design: Allocation: Non-Randomized
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

Resource links provided by NLM:

Further study details as provided by University of Aarhus:

Primary Outcome Measures:
  • 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

Estimated Enrollment: 60
Study Start Date: November 2006
Study Completion Date: March 2007
Detailed Description:

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.


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • ischemic heart disease verified with a coronary angiogram
  • treatment with 75 mg aspirin once daily

Exclusion Criteria:

  • ischemic vascular event within the previous 12 months
  • percutaneous coronary intervention or coronary artery by-pass grafting within the previous 12 months
  • treatment with NSAID, clopidogrel, ticlopidine, dipyridamole, warfarin or any other drug affecting platelet aggregation
  • platelet count < 120 x 10^9/l
  • not able to give informed consent
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Please refer to this study by its identifier: NCT00389129

Department of Cardiology, Skejby Sygehus, Aarhus University Hospital
Aarhus, Denmark, 8200
Sponsors and Collaborators
University of Aarhus
Danish Research Agency
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
  More Information Identifier: NCT00389129     History of Changes
Other Study ID Numbers: 20060142
Study First Received: October 17, 2006
Last Updated: December 10, 2007

Keywords provided by University of Aarhus:
Aspirin Resistance
Platelet aggregation

Additional relevant MeSH terms:
Anti-Inflammatory Agents, Non-Steroidal
Analgesics, Non-Narcotic
Sensory System Agents
Peripheral Nervous System Agents
Physiological Effects of Drugs
Anti-Inflammatory Agents
Antirheumatic Agents
Fibrinolytic Agents
Fibrin Modulating Agents
Molecular Mechanisms of Pharmacological Action
Platelet Aggregation Inhibitors
Cyclooxygenase Inhibitors
Enzyme Inhibitors
Antipyretics processed this record on May 25, 2017