A 45-year-old male presents to the emergency department with severe headache, vomiting, and altered mental status. His vital signs are: BP 180/100 mmHg, HR 55 bpm, RR 12/min, and SpO2 98% on room air. Which of the following interventions should be prioritized to manage this patient's suspected increased intracranial pressure?
Administer 1L normal saline bolus
Elevate the head of the bed to 30 degrees
Administer mannitol 1g/kg IV push
Intubate the patient immediately