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Interpreting Change in Disorders of Consciousness Using the Coma Recovery Scale-Revised.

Jennifer A Weaver1, Alison M Cogan2, Allan J Kozlowski3

  • 1Department of Occupational Therapy, College of Health and Human Sciences, Colorado State University, Fort Collins, Colorado, USA.

Journal of Neurotrauma
|April 13, 2024
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Summary

This study developed new methods to measure meaningful changes in patients with disorders of consciousness (DoC) after brain injury. These indices help distinguish true patient improvement from normal fluctuations, aiding clinical assessment.

Keywords:
assessment toolsoutcome measurestraumatic brain injury

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Area of Science:

  • Neuroscience
  • Clinical Rehabilitation
  • Psychometrics

Background:

  • Patients with disorders of consciousness (DoC) following severe brain injury often exhibit subtle changes.
  • Distinguishing clinically meaningful improvement from normal fluctuations is crucial for accurate assessment and treatment.
  • The Coma Recovery Scale-Revised (CRS-R) is a common tool, but its ordinal scores can limit precision.

Purpose of the Study:

  • To develop and validate indices of responsiveness for the Coma Recovery Scale-Revised (CRS-R) to differentiate true change from measurement error in patients with DoC.
  • To establish minimal clinically important difference (MCID) and minimal detectable change (MDC) values using Rasch Measurement theory.
  • To assess the proportion of patients demonstrating significant change and potential shifts in their state of consciousness.

Main Methods:

  • Utilized data from 180 participants with DoC in a clinical trial.
  • Transformed ordinal CRS-R scores (0-23) to equal-interval measures (0-100) using Rasch Measurement theory.
  • Calculated distribution-based MCID (0.5 SD), MDC (95% CI), and conditional MDC for responsiveness indices.

Main Results:

  • The calculated indices were: 0.5 SD MCID = 9 units, MDC = 11 units, and conditional MDC ranged from 11 to 42 units.
  • 70% of the amantadine group and 58% of the placebo group showed change beyond MDC.
  • 54% of the unresponsive wakefulness syndrome group and 69% of the minimally conscious state group showed change beyond MDC.

Conclusions:

  • The developed CRS-R responsiveness indices, particularly MDC, effectively identify true behavioral changes in patients with DoC.
  • These metrics support clinicians and researchers in discerning clinically significant changes beyond measurement error.
  • Relying solely on ordinal CRS-R scores may lead to inaccurate interpretations of patient progress.