A 50-year-old woman presents to the emergency department with symptoms of green sputum, palpitations, fever, fatigue, and lethargy. Upon examination, she has bronchial breathing at her right lung base, a respiratory rate of 25 breaths per minute, oxygen saturation of 95% on room air, an irregularly irregular heartbeat, a heart rate of 120 beats per minute, and a blood pressure of 90/40 mmHg. An ECG shows atrial fibrillation with a fast ventricular rate and she has no prior history of atrial fibrillation. What should be the first course of treatment for her?

A. Bisoprolol

B. Digoxin

C. Intravenous fluids

D. Oral antibiotics

E. Flecainide

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