A 58-year-old woman with a history of paroxysmal atrial fibrillation (AF) presents to the emergency department with palpitations and dyspnea for 2 hours. Vital signs: HR 165/min, BP 88/54 mmHg, RR 28/min, SpO₂ 90% on room air. Lung auscultation reveals bibasal crackles. ECG confirms AF with rapid ventricular response. Troponin is negative. What is the most appropriate immediate next step in management?

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