11th June 2021

A 2-year-old girl called Evie is brought to the emergency department by her father

A 2-year-old girl called Evie is brought to the emergency department by her father after she fell off her scooter. Her father reveals that Evie tires easily, that she often squats following exertion, and that her lips turn blue when she is crying. Evie has met her developmental milestones but is below the 10th percentile for her age’s weight and height. On examination, she is crying, appears to be cyanotic, and has an ejection systolic murmur heard loudest at the upper left sternal border.

What is the most likely explanation?

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