22nd May 2025

A 48-year-old lady on a general medical ward was admitted with dysuria; right flank pain and fever.

A 48-year-old lady on a general medical ward was admitted with dysuria; right flank pain and fever. She is being treated with intravenous antibiotics for pyelonephritis and complains of new onset palpitations for two hours. She has no chest pain but is aware of her heart beating. Observations show blood pressure 135/85mmHg; heart rate 100 bpm, oxygen saturations 100% on room air, respiratory rate 15 per minute and temperature of 37.6 degrees Celsius. Her ECG shows new atrial fibrillation with a ventricular rate of 103. You review their notes and note a past medical history of diet controlled type 2 diabetes. You decide to pharmacologically cardiovert them. Which of the following best describes the medication you will choose?  

Select the SINGLE most appropriate option from the list below. Select ONE option only.