The Glasgow Coma Scale (GCS) fails to assess the verbal score in intubated patients and is unable to test brainstem reflexes. The FOUR (Full Outline of UnResponsiveness) score was devised (Eelco F. M. Wijdicks et al, Ann Neurol 2005;58:585–593). Which of the following is not a component of the FOUR score?
A. eye
B. motor
C. brainstem
D. respiration
E. heart rate