9th May 2025

A 21-year-old female presents to her GP with a 12-month history of worsening shortness of breath.

A 21-year-old female presents to her GP with a 12-month history of worsening shortness of breath. There is no report of chest pain, cough or wheezing. She has no known past medical history. On auscultation, there is a loud second heart sound. Her ECG conducted in the clinic shows left axis deviation and right bundle branch block.

Which of the options below is the most likely diagnosis?

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