A 62-year-old man with hypertension and diabetes mellitus presents with palpitations and dyspnea for 6 hours. Vital signs: HR 142/min, BP 158/92 mmHg, RR 24/min, SpO₂ 94% on room air. ECG shows atrial fibrillation with rapid ventricular response. Chest X-ray is normal. Troponin I is negative. What is the most appropriate immediate next step in management?

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