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Related Experiment Videos

Exaggerated warfarin sensitivity: a case report.

G J Vanscoy1, J W McAuley

  • 1Department of Pharmacy and Therapeutics, University of Pittsburgh School of Pharmacy, PA 15261.

Veterinary and Human Toxicology
|June 1, 1991
PubMed
Summary

A patient experienced severe bleeding due to an accidental warfarin overdose, highlighting extreme sensitivity to this anticoagulant. This case underscores the variable patient response to warfarin therapy.

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Area of Science:

  • Pharmacology
  • Internal Medicine

Background:

  • Warfarin is a widely used anticoagulant medication.
  • Patient response to warfarin can vary significantly, leading to either resistance or sensitivity.
  • Understanding these variations is crucial for safe and effective anticoagulation therapy.

Observation:

  • A 64-year-old male patient developed significant bleeding and prolonged prothrombin time (PT) after inadvertently doubling his warfarin dose.
  • The patient was previously stable on a low dose of warfarin (2.5 mg every fourth day).
  • Treatment involved vitamin K, fresh frozen plasma, and packed red blood cells, followed by dose stabilization at 0.5 mg daily.

Findings:

  • Warfarin plasma concentrations and clotting factor analysis (CFA) were evaluated.
  • The patient's response was characterized as exaggerated warfarin sensitivity, not explained by drug interactions or excessive warfarin levels.
  • CFA indicated a moderate warfarin effect, suggesting extreme tissue sensitivity as a potential cause.

Implications:

  • This case highlights an unusual presentation of warfarin sensitivity.
  • It emphasizes the need for careful monitoring and individualized dosing of warfarin.
  • Further research into the mechanisms of extreme tissue sensitivity to warfarin may improve patient management.

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