9th May 2025

An eight-month-old female attends ED with her worried parents due to increased breathlessness and episodes where she appears blue.

An eight-month-old female attends ED with her worried parents due to increased breathlessness and episodes where she appears blue. On examination, you note that there is clubbing to her digits and a surgical scar adjacent to the sternum within the right intercostal area. She appears mildly cyanosed, with an audible harsh ejection systolic murmur at the left sternal edge noted. Pre and post-ductal pulse oximetry shows low oxygen saturations.

Which of the following is most likely to be the underlying diagnosis? 

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