5th May 2025

A 70-year-old man attends the general cardiology outpatient clinic.

A 70-year-old man attends the general cardiology outpatient clinic. He has just moved to the area and his records are not available from his previous GP, however on seeing his new GP he mentioned that he has an irregular heart rhythm and has been on medication to control this for “decades”. On examination, the man has a blue-grey colour (particularly in the eyes) and fine bibasal crackles are auscultated in the lungs. His rate is 90 bpm and BP is 124/67. Sats are 91% on air. Which medication is most likely to be responsible for his presentation?

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