A 72-year-old man with chronic hypertension and diabetes presents with syncope. On examination, heart rate is 35 bpm and irregular, blood pressure is 85/55 mmHg. ECG shows P waves at a rate of 80 bpm and QRS complexes at 35 bpm, with no fixed relationship between them. The QRS duration is 0.12 seconds. What is the most appropriate initial management?

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