Calculated recovery rates in severe head trauma

Area of Science:

• Neurology
• Trauma Care
• Clinical Assessment

Background:

• The Glasgow Coma Scale (GCS) is a standard tool for assessing consciousness after head injury.
• Limitations of GCS include exclusion of unevaluable responses and less detailed information on brainstem reflexes and motor lateralization.

Purpose of the Study:

• To compare the efficacy of the Maryland Coma Scale (MCS) and GCS in assessing recovery rates and predicting outcomes in head-injured patients.
• To evaluate the reliability of serial scoring using MCS versus GCS.

Main Methods:

• Recovery rates were calculated for 120 head-injured patients using both GCS and MCS scores.
• Serial plots of raw scores were analyzed for reliability, considering factors affecting patient assessment.
• Prognostic significance of Day 1 scores from both scales was assessed using chi-squared analysis.

Main Results:

• MCS and GCS recovery rates generally agreed (r=0.76-0.79), but differed by over 10% in 39% of patients.
• MCS scores more accurately reflected favorable outcomes when they exceeded GCS scores.
• Day 1 MCS scores (<35%) and GCS scores (<7) predicted outcomes (p<0.001).
• In severe cases (GCS ≤7), GCS prediction was at chance, while MCS (<35%) indicated poor outcomes in 20/26 patients.

Conclusions:

• The Maryland Coma Scale provides a more sensitive index of clinical course in head-injured patients, particularly those with severe injuries.
• A Day 1 MCS raw score of ≤35% is a significant indicator of a grave prognosis.
• MCS serial scoring may be more reliable than GCS when patients have factors affecting assessment (e.g., intubation, sedation).