A 62-year-old male with a history of hypertension and coronary artery disease is scheduled for elective laparoscopic cholecystectomy. On induction, propofol 2 mg/kg IV is administered. Within 30 seconds, the patient develops profound hypotension (BP 70/40 mmHg) and bradycardia (HR 42/min). The patient remains unresponsive but airway reflexes are intact. What is the most appropriate immediate next step?