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Warfarin initiation nomograms for venous thromboembolism.

Pedro Garcia1, Wilson Ruiz, César Loza Munárriz

  • 1Department of Medicine, Hospital Especializado Victor Lazarte Echegaray, Prolongación Unión No. 1380, Trujillo, Peru.

The Cochrane Database of Systematic Reviews
|January 30, 2016
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Summary

A 10-mg warfarin loading dose may achieve a therapeutic international normalized ratio (INR) faster than a 5-mg dose for venous thromboembolism (VTE) patients. However, evidence is limited, and outcomes like bleeding and recurrent VTE showed no significant differences between the two warfarin dosing strategies.

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Area of Science:

  • Cardiology
  • Hematology
  • Pharmacology

Background:

  • Venous thromboembolism (VTE), including deep venous thrombosis (DVT) and pulmonary embolism (PE), is a prevalent condition in hospitalized patients.
  • Optimal initial warfarin dosing remains controversial, impacting the speed of achieving therapeutic anticoagulation and treatment efficiency.
  • Rapidly achieving a therapeutic international normalized ratio (INR) with warfarin minimizes the need for parenteral anticoagulation and associated costs.

Purpose of the Study:

  • To compare the efficacy of a 10-mg warfarin nomogram versus a 5-mg warfarin nomogram in patients diagnosed with VTE.
  • To evaluate the speed of achieving a therapeutic INR and the incidence of adverse events associated with different warfarin initiation doses.

Main Methods:

  • Systematic review and meta-analysis of randomized controlled trials (RCTs) comparing 10-mg and 5-mg warfarin initiation nomograms.
  • Searched multiple databases including Cochrane Register, PubMed, and LILACS up to September 2015.
  • Independent assessment of trial quality and data extraction by two reviewers.

Main Results:

  • A 10-mg warfarin nomogram showed a trend towards achieving a therapeutic INR by day five (RR 1.27, 95% CI 1.05 to 1.54), with moderate quality evidence but substantial heterogeneity.
  • No significant differences were observed in recurrent VTE at 90 days (RR 1.48, 95% CI 0.39 to 5.56), major bleeding (RR 0.97, 95% CI 0.27 to 3.51), or minor bleeding (RR 0.52, 95% CI 0.15 to 1.83).
  • Length of hospital stay also showed no significant difference between the two dosing regimens (MD -2.3 days, 95% CI -7.96 to 3.36).

Conclusions:

  • Considerable uncertainty exists regarding the optimal initial warfarin loading dose (10-mg vs. 5-mg) for acute VTE patients.
  • Heterogeneity in study participants and follow-up duration limits the certainty of findings on optimal warfarin initiation nomograms.
  • Further research is needed to clarify the most effective and safest warfarin dosing strategy for VTE treatment.