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?
Intubate the patient immediately
Administer mannitol 1g/kg IV push
Administer 1L normal saline bolus
Elevate the head of the bed to 30 degrees