4th August 2020

A 65-year-old male with a background of STEMI a year ago presents to his GP

A 65-year-old male with a background of STEMI a year ago presents to his GP complaining of progressively worsening shortness of breath over the past three months. He describes being unable to carry out his regular walk due to the breathlessness. On examination, he has bilateral pitting oedema below his knees. 

Given the likely diagnosis, which of the following is the most important next investigation?

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