Critical Neurological Emergency: Glasgow Coma Score of 5

Severity Classification and Clinical Significance

A Glasgow Coma Score of 5 indicates very severe traumatic brain injury with extremely high mortality risk, requiring immediate transport to a trauma center and consideration for neurosurgical intervention, though prognosis remains grave with mortality rates approaching 100% in certain subgroups 1
The American College of Surgeons recommends that a GCS of 5 falls within the severe traumatic brain injury category (GCS ≤8), specifically in the "very severe" subcategory (GCS 3-5) that carries the worst prognosis, with a scale ranging from 3 (deep coma) to 15 (normal consciousness) 2

The Centers for Disease Control and Prevention recommends that any patient with GCS <14 meets critical physiologic criteria requiring immediate transport to a trauma center, with GCS of 5 representing far more severe compromise 1, 3
Patients with GCS <14 have documented mortality rates of 24.7%, though this increases substantially for GCS 3-5 patients, according to the American College of Surgeons 1, 4

Serial GCS assessments provide substantially more valuable clinical information than single determinations, with declining or persistently low scores indicating poorer prognosis, as recommended by the Scandinavian protocols 3, 4
The Scandinavian protocols recommend monitoring every 15 minutes during the first 2 hours, then hourly for the following 12 hours for patients with severe TBI 4
A decrease of at least two points in GCS score should prompt immediate repeat CT scanning, according to the American College of Radiology 4
Individual component scores (Eye, Motor, Verbal) must be documented at each assessment rather than just the sum score, as patients with identical totals but different component profiles may have different outcomes, as recommended by the National Institute of Neurological Disorders and Stroke 3, 4
Pupillary size and reactivity must be documented at each assessment as key prognostic indicators, according to the American Academy of Neurology 4

The American Medical Association recommends that clinical decision making, particularly regarding treatment limitations, should never rely solely on the GCS score, and account for confounding factors including sedation, intubation, facial trauma, intoxication, and metabolic disturbances that may affect the accuracy of GCS assessment 2, 3
The American College of Emergency Physicians recognizes the limitations of the GCS, which was originally designed for comatose patients and serial evaluations, not for single-point severity determination 5