Pathophysiology
Clinical meaning
The Glasgow Coma Scale is the most widely used standardized tool for assessing level of consciousness and neurological function. It evaluates three independent responses: Eye Opening, Verbal Response, and Motor Response. Total score ranges from 3 (deep coma/brain death) to 15 (fully alert and oriented). Eye Opening (E): Tests the arousal component of consciousness, primarily mediated by the reticular activating system (RAS) in the brainstem. • 4 = Spontaneous (eyes open without stimulation: RAS functioning) • 3 = To voice/command (opens eyes when spoken to) • 2 = To pressure/pain (opens eyes only to painful stimulus) • 1 = None (no eye opening even with pain: severe brainstem dysfunction) Verbal Response (V): Tests the cognitive/awareness component, primarily involving the cerebral cortex and language centers (Broca and Wernicke areas). • 5 = Oriented (knows who, where, when, and what happened) • 4 = Confused (speaks in sentences but is disoriented) • 3 = Inappropriate words (random words, no sustained conversation) • 2 = Incomprehensible sounds (moaning, groaning, no words) • 1 = None (no verbal response) Motor Response (M): Tests both...