What characterizes severe brain injury?

A severe brain injury is characterized by significant and prolonged disruption in brain function. Coma lasting 24 hours or longer is a critical indicator of severe injury, as it reflects a serious level of unconsciousness and suggests a substantial impact on brain activity and consciousness. This prolonged state indicates that the brain is struggling to regain its normal functions, which is often associated with more extensive damage.

In contrast, temporary loss of consciousness signifies a milder brain injury and does not meet the criteria for severity. Minor bruising and bleeding in the brain often correspond to less severe injuries, where symptoms can resolve without lasting impairment. A normal Glasgow Coma Scale (GCS) rating of 15 indicates full awareness and responsiveness, which does not align with the characteristics of severe brain injury. Therefore, the presence of a coma lasting 24 hours or longer is a definitive marker that classifies the brain injury as severe.