Standardized assessment instruments for minimally-responsive, brain-injured patients.

Area of Science:

• Neuroscience
• Rehabilitation Medicine
• Clinical Assessment

Background:

• Standardized assessment scales are crucial for managing severely brain-injured, minimally-responsive patients (MRP).
• Existing instruments include the Coma/Near Coma Scale (CNC), Coma Recovery Scale (CRS), Sensory Stimulation Assessment Measure (SSAM), and Western Neuro Sensory Stimulation Profile (WNSSP).

Purpose of the Study:

• To review the content, psychometric properties, and clinical attributes of current assessment scales for MRP.
• To compare admission scores of the CRS, WNSSP, and CNC in a small cohort of MRP.
• To evaluate the ability of these scales to predict patient outcomes.

Main Methods:

• Review of available assessment scales for minimally-responsive patients.
• Comparison of converted, percentile admission scores for CRS, WNSSP, and CNC in ten MRP (Rancho Levels II-IV).
• Analysis of scale performance in distinguishing between dichotomized outcome variables.

Main Results:

• Admission scores for CNC and CRS clustered in the mid-range, while WNSSP scores were in the lower quartile, suggesting a potential 'floor effect' for WNSSP.
• None of the scales effectively differentiated patient disposition, rehabilitation advancement, or discharge Functional Independence Measure scores.
• The CRS demonstrated moderate correlations with both the CNC and WNSSP.

Conclusions:

• Current standardized scales show potential but require further validation in larger, diverse patient populations.
• The CRS appears to have a stronger relationship with other scales compared to WNSSP, which may be limited by a floor effect.
• Longitudinal studies incorporating the SSAM are needed to fully understand the interrelationships and predictive validity of these scales for MRP outcomes.