Also, with a head injury, one of the common issues during recovery is combativeness. The patient may be awake, but he does not know how to respond appropriately to stimuli. He will therefore "fight" people who may be touching him (checking vitals, changing IVs, holding his hand). Because of this confused state, the patient becomes more harm to himself, as he may rip out IVs, pull out a trach tube if he has one, etc...
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