23rd September 2021

A 3-year-old male is taken to see his general practitioner (GP) due to increased fatiguability

A 3-year-old male is taken to see his general practitioner (GP) due to increased fatiguability. The mother reports that he appears too tired to play with his siblings. Whenever he does play, he frequently stops and looks like he is struggling to breathe. He has no cough or fever. Of note on examination, he appears a bluish colour, and there is a pansystolic murmur.

Which of the following is the most likely diagnosis?

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