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Warfarin resistance due to malabsorption

I Talstad1, O N Gamst

  • 1Haukeland University Hospital, Bergen, Norway.

Journal of Internal Medicine
|October 1, 1994
PubMed
Summary
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A patient developed warfarin resistance due to poor drug absorption, not altered metabolism. This resistance extended to dicoumarol but not phenindione, indicating specific mechanisms of drug interaction.

Area of Science:

  • Pharmacology
  • Drug Metabolism
  • Clinical Medicine

Background:

  • Warfarin is a widely prescribed anticoagulant.
  • Warfarin resistance is a rare but significant clinical challenge.
  • Understanding resistance mechanisms is crucial for patient management.

Observation:

  • A female patient exhibited resistance to warfarin after two years of effective therapy.
  • Oral warfarin absorption was reduced to one-third of the administered dose.
  • Warfarin clearance remained within normal physiological limits.

Findings:

  • The patient demonstrated resistance to both warfarin and dicoumarol.
  • Phenindione effectively managed the patient's prothrombin time (PT).
  • The primary issue identified was impaired oral absorption of warfarin, not altered drug metabolism.

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Implications:

  • This case highlights the importance of assessing drug absorption in cases of apparent warfarin resistance.
  • Differential response to anticoagulants suggests distinct mechanisms of resistance.
  • Further investigation into absorption-related resistance is warranted for anticoagulation therapy.