A client has had a traumatic brain injury and is mechanically ventilated. Which technique would the nurse use to prevent increasing intracranial pressure (ICP)?

In a mechanically ventilated client with traumatic brain injury, preventing increases in intracranial pressure (ICP) is a central nursing priority. Maintaining a neutral head and neck position promotes unobstructed venous drainage from the brain through the jugular veins. Rotation or flexion of the neck can compress these vessels and impede venous outflow, causing venous blood to accumulate intracranially and raise ICP. Typically, the head of the bed is elevated 30 degrees with the head in a neutral midline position. Placing the client in the Trendelenburg position is contraindicated because a head-down tilt significantly increases venous pressure and ICP, worsening cerebral edema. Suctioning frequently is also harmful because it triggers the Valsalva response and stimulates coughing, both of which transiently but significantly raise ICP; suctioning should be performed only when clinically necessary and for no more than 10 seconds at a time, with pre-oxygenation. Grey Turner sign — flank bruising indicating retroperitoneal hemorrhage — is not relevant to ICP monitoring. It is an assessment finding for abdominal trauma, making this option a distractor unrelated to ICP management. Neutral head positioning is therefore the single most consistently applicable preventive technique among the options provided.