Which combination defines severe traumatic brain injury (TBI) on initial assessment and post-traumatic amnesia (PTA) duration?

Which combination defines severe traumatic brain injury (TBI) on initial assessment and post-traumatic amnesia (PTA) duration?

• A. GCS ≤ 8 on initial assessment; PTA lasting more than 24 hours
• B. GCS 9-12 on initial assessment; PTA lasting more than 24 hours
• C. GCS ≤ 8 on initial assessment; PTA lasting 1-6 hours
• D. GCS 13-15 on initial assessment; PTA lasting more than 24 hours

Answer: (A)

Severe TBI is defined by a very low level of consciousness at the time of first assessment and a prolonged inability to form new memories. A Glasgow Coma Scale of 8 or less on arrival shows substantial impairment of arousal and responsiveness. Post-traumatic amnesia lasting more than 24 hours indicates a significant interruption of memory formation after the injury. When both of these indicators are present together, it reflects a high level of injury severity across immediate consciousness and cognitive recovery. The other scenarios either show a higher initial GCS (milder unconsciousness) or a PTA duration that does not accompany a severely depressed initial score, which does not meet this combined definition.

Severe TBI is defined by a very low level of consciousness at the time of first assessment and a prolonged inability to form new memories. A Glasgow Coma Scale of 8 or less on arrival shows substantial impairment of arousal and responsiveness. Post-traumatic amnesia lasting more than 24 hours indicates a significant interruption of memory formation after the injury. When both of these indicators are present together, it reflects a high level of injury severity across immediate consciousness and cognitive recovery. The other scenarios either show a higher initial GCS (milder unconsciousness) or a PTA duration that does not accompany a severely depressed initial score, which does not meet this combined definition.