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Related Experiment Videos

How does warfarin affect the activated coagulation time?

R J Chang1, T M Doherty, S L Goldberg

  • 1Department of Medicine, Harbor-UCLA Medical Center, Torrance, Calif 90509, USA. DrRChang@POL.NET

American Heart Journal
|September 15, 1998
PubMed
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Warfarin therapy causes a linear increase in activated coagulation time (ACT), similar to heparin. This finding is crucial for managing patients on warfarin during cardiac catheterization procedures.

Area of Science:

  • Cardiovascular Medicine
  • Hematology
  • Clinical Pathology

Background:

  • Activated coagulation time (ACT) measures heparin anticoagulation during cardiac catheterization.
  • Warfarin therapy effects on ACT have not been previously described.
  • Emergent procedures may require catheterization for patients on warfarin.

Purpose of the Study:

  • To compare ACT and international normalized ratios (INR) in patients receiving warfarin versus controls.
  • To investigate the relationship between warfarin, ACT, and INR.

Main Methods:

  • Compared ACT and INR in 77 warfarin patients and 57 controls.
  • Statistical analysis to determine differences and correlations.

Main Results:

Related Experiment Videos

  • Warfarin patients showed significantly higher ACT and INR than controls (P<0.05).
  • A linear increase in ACT correlated with INR in the warfarin group (r=0.70, P<0.001).
  • No ACT-INR relationship was observed in the control group.

Conclusions:

  • Warfarin therapy leads to a predictable, linear increase in ACT.
  • This ACT response in warfarin patients resembles that seen with heparin therapy.
  • Understanding this relationship is vital for anticoagulation management during cardiac procedures.