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Related Experiment Videos

Bleeding classification in clinical trials: observer variability and clinical relevance

Y P Graafsma1, M H Prins, A W Lensing

  • 1Department of Clinical Epidemiology and Biostatistics, University of Amsterdam, The Netherlands.

Thrombosis and Haemostasis
|November 19, 1997
PubMed
Summary

The criteria for major bleeding in venous thrombosis treatment are reproducible and clinically relevant. However, minor bleeding criteria lack reproducibility and clinical relevance.

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Area of Science:

  • Hematology
  • Clinical Trial Methodology
  • Medical Informatics

Background:

  • Accurate bleeding classification is crucial for evaluating treatments in venous thrombosis.
  • Previous studies highlight variability in bleeding event assessment.

Purpose of the Study:

  • To assess the reproducibility and clinical relevance of bleeding classification criteria used in a venous thrombosis trial.
  • To evaluate the agreement between independent adjudication, treating physicians, and clinical experts.

Main Methods:

  • Independent adjudication of bleeding episodes by a committee, with dual assessments.
  • Grading of bleeding by treating physicians and independent experts based on clinical severity and patient impact.
  • Statistical analysis using kappa statistics and ROC curves to determine agreement and association.

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Main Results:

  • High inter-rater reliability (kappa > 0.7) for major bleeding vs. no/minor bleeding.
  • Lower reliability (kappa < 0.5) for major/minor bleeding vs. no bleeding.
  • Strong association (AUC > 0.95) between adjudicated major bleeding and clinical severity/patient impact.
  • Weaker association (AUC < 0.7) for major/minor bleeding vs. no bleeding.

Conclusions:

  • The criteria for defining major bleeding in venous thrombosis trials are reproducible and clinically relevant.
  • The criteria for minor bleeding lack reproducibility and show limited association with clinical relevance.
  • Refinement of minor bleeding criteria is recommended for future clinical trials.