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Thrombosis prevention trial: compliance with warfarin treatment and investigation of a retained effect

Alicja R Rudnicka1, Deborah Ashby, Patrick Brennan

  • 1Department of Environmental and Preventive Medicine, Medical Research Council Epidemiology and Medical Care Unit, Wolfson Institute of Preventive Medicine, London, England. a.r.rudnicka@qmul.ac.uk

Archives of Internal Medicine
|June 26, 2003
PubMed

Insights

Adherence to warfarin significantly reduces coronary heart disease (CHD) risk, especially for fatal events. Warfarin also shows a sustained protective effect even after treatment cessation, highlighting its benefits in cardiovascular disease prevention.

Area of Science:

  • Cardiology
  • Pharmacology
  • Clinical Trials

Background:

  • The Thrombosis Prevention Trial investigated primary prevention of coronary heart disease (CHD) using warfarin and/or aspirin.
  • Previous findings indicated a reduction in CHD risk with warfarin and/or aspirin treatment.

Purpose of the Study:

  • To evaluate the impact of compliance with warfarin treatment on CHD risk.
  • To determine if warfarin exhibits a retained protective effect after discontinuation.

Main Methods:

  • Compared CHD risk in compliant warfarin users versus placebo recipients.
  • Assessed CHD risk in former warfarin users against placebo controls.
  • Estimated the potential increase in time to CHD events under full compliance scenarios for both warfarin and placebo groups.

Main Results:

  • Compliance with warfarin was associated with a reduced risk of all CHD (HR 0.75) and fatal CHD (HR 0.49).
  • Former warfarin users showed a retained risk reduction of 23% for all CHD and 34% for fatal events.
  • Full compliance with warfarin could extend survival time to a CHD event by 1.39 times, and for fatal CHD by 2.04 times.

Conclusions:

  • Full compliance with warfarin may reduce the risk of fatal CHD by 50%.
  • Evidence suggests a retained beneficial effect of warfarin after treatment cessation.
  • These findings reinforce the advantages of low-intensity oral anticoagulation with warfarin.
Abstract

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