A 58-yeаr-оld client with а histоry оf coronаry artery disease is admitted to the emergency department with complaints of palpitations, dizziness, and chest pain. The ECG shows a wide, regular tachycardia with a rate of 180 bpm, and the patient appears hypotensive. The healthcare provider suspects ventricular tachycardia (VT). Which intervention should the nurse prioritize?