Prioritizing Interventions in a Potential Stroke Patient

A 55-year-old female patient with a history of hypertension and type 2 diabetes presents to the emergency department with severe headache, nausea, and visual disturbances. On assessment, her blood pressure is found to be 210/120 mmHg. The patient reports that the headache started abruptly and is the worst she has ever experienced. She also mentions experiencing dizziness and has difficulty focusing her vision. Given the potentially life-threatening nature of her symptoms, which of the following interventions should be prioritized by the nursing staff in the emergency department?