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Superwarfarin poisoning

J D Chua1, W R Friedenberg

  • 1Marshfield Clinic, Wis, USA.

Archives of Internal Medicine
|October 6, 1998
PubMed
Summary
This summary is machine-generated.

Superwarfarin poisoning is a growing concern, with cases often linked to accidental ingestion, suicide attempts, or Munchausen syndrome. Early diagnosis and treatment are crucial for reversing anticoagulation effects.

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Area of Science:

  • Toxicology
  • Public Health
  • Internal Medicine

Background:

  • Superwarfarin sodium exposure and poisoning represent an increasing public health issue, with reported cases rising significantly between 1988 and 1995.
  • Cases of superwarfarin poisoning can stem from accidental exposure, suicide attempts, or Munchausen syndrome, presenting diagnostic challenges.

Purpose of the Study:

  • To investigate the causes, clinical presentations, diagnostic difficulties, treatment strategies, and prevention of superwarfarin poisoning.
  • To analyze cases of superwarfarin exposure in a tertiary referral center in rural Wisconsin.

Main Methods:

  • Retrospective review of eleven patient cases meeting criteria for superwarfarin exposure or poisoning.
  • Examination of clinical manifestations, diagnostic timelines, treatment interventions, and patient outcomes.

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Main Results:

  • Eleven cases were identified: 7 accidental pediatric ingestions, 2 adult Munchausen syndrome cases, and 2 suicide attempts (1 teenager, 1 adult).
  • Brodifacoum was the agent in nine cases. Accidental ingestions and suicide attempts were diagnosed promptly, unlike Munchausen syndrome cases which had delayed diagnoses.
  • Anticoagulation reversal was rapid in accidental and suicide cases, but prolonged for Munchausen syndrome patients. No fatalities occurred.

Conclusions:

  • Superwarfarin poisoning should be considered in patients with vitamin K deficiency-like coagulopathy unresponsive to standard vitamin K1 therapy, excluding other common causes.
  • The increasing incidence of superwarfarin poisoning necessitates its inclusion in differential diagnoses for unexplained coagulopathies.