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Anticoagulant rodenticides.

Barbara E Watt1, Alex T Proudfoot, Sally M Bradberry

  • 1National Poisons Information Service (Birmingham Centre), City Hospital, Birmingham, UK.

Toxicological Reviews
|February 28, 2006
PubMed
Summary
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Anticoagulant rodenticides, including long-acting types, pose risks from accidental or intentional ingestion. Routine INR monitoring is unnecessary for young children, but crucial for others post-exposure to guide treatment.

Area of Science:

  • Toxicology
  • Pharmacology
  • Emergency Medicine

Background:

  • Anticoagulant rodenticides are widely used for pest control, with newer long-acting formulations developed due to resistance.
  • Exposure commonly occurs in young children, but significant ingestion can lead to prolonged anticoagulation.
  • These agents inhibit vitamin K(1)-2,3 epoxide reductase, disrupting the synthesis of crucial clotting factors.

Purpose of the Study:

  • To review the mechanism of action, clinical effects, and management of anticoagulant rodenticide poisoning.
  • To establish guidelines for monitoring and treating patients exposed to these substances.

Main Methods:

  • Review of existing literature on anticoagulant rodenticide toxicity and clinical management.
  • Analysis of case reports and clinical data, particularly concerning exposure in children.

Related Experiment Videos

  • Evaluation of diagnostic markers like the international normalised ratio (INR) and treatment protocols.

    • Main Results:

    • Long-acting anticoagulant rodenticides have prolonged effects due to high potency, hepatic accumulation, and long half-lives.
    • Clinical manifestations range from minor bleeding to severe hemorrhage, potentially leading to shock and death.
    • Routine INR measurement is deemed unnecessary for young children with documented exposure.

    Conclusions:

    • For non-pediatric cases, INR monitoring 36-48 hours post-exposure is recommended; normal results indicate no further action.
    • Active bleeding requires immediate treatment with vitamin K (phytomenadione) and clotting factor replacement.
    • Management strategies should be tailored based on INR levels and the presence of active bleeding.