A 28-year-old woman with known mitral stenosis (MVA 0.9 cm² on echo) presents to the emergency department with acute-onset palpitations and dyspnea. Vital signs: HR 140/min, BP 110/70 mmHg, RR 28/min. ECG shows atrial fibrillation with a rapid ventricular response. Chest X-ray shows pulmonary edema. She denies chest pain and troponin is negative. What is the most appropriate immediate management?

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