You are caring for Mr. S., who has sustained a closed head injury from a motor vehicle crash. He has an intraventricular catheter for continuous measurement of intracranial pressure (ICP). His ICP has...

You are caring for Mr. S., who has sustained a closed head injury from a motor vehicle crash. He has an intraventricular catheter for continuous measurement of intracranial pressure (ICP). His ICP has been stable at 13 mm Hg for the past 4 hours. The alarm on the monitor sounds because his ICP is now 20 mm Hg. What are your priority assessments and interventions at this time?