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Analysis of warfarin therapy in pediatric patients: A prospective cohort study of 319 patients

W Streif1, M Andrew, V Marzinotto

  • 1Hamilton Civic Hospital Research Centre, Hamilton, Ontario, Canada.

Blood
|November 11, 1999
PubMed

Insights

Pediatric warfarin dosing is complex, with age significantly impacting therapy. Younger children require more intensive management for effective anticoagulation and fewer complications.

Area of Science:

  • Pediatric anticoagulation management
  • Pharmacokinetics and pharmacodynamics in children
  • Clinical pharmacology

Background:

  • Warfarin is a critical anticoagulant in pediatric patients.
  • Optimizing warfarin therapy in children presents unique challenges due to physiological differences.
  • Understanding factors influencing warfarin efficacy and safety is essential for clinical practice.

Purpose of the Study:

  • To analyze warfarin use in a large pediatric cohort.
  • To identify factors influencing warfarin dosing, efficacy, and safety in children.
  • To evaluate the impact of age, disease, and concomitant medications on warfarin therapy.

Main Methods:

  • Prospective, consecutive cohort study of pediatric patients managed in a central anticoagulation clinic.
  • Multivariate analysis of warfarin therapy aspects, including dosage, time to target INR, and INR variability.
  • Stratification of patients by age, target INR, disease, medications, and enteral nutrition use.

Main Results:

  • Age was an independent factor influencing all aspects of warfarin therapy.
  • Infants (
  • Specific patient groups, including Fontan patients, those on corticosteroids or certain antiepileptics, and those on enteral nutrition, showed distinct warfarin management needs.
  • Serious bleeding occurred in 0.5% of patient-years, and recurrent thromboembolic events occurred in 1.3% of patient-years.

Conclusions:

  • Age is a critical determinant in pediatric warfarin management, with younger children needing more intensive monitoring and dose adjustments.
  • Concomitant medications and enteral nutrition significantly affect warfarin requirements in children.
  • Effective anticoagulation with warfarin in pediatric populations requires individualized management strategies considering multiple clinical factors.

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