23rd September 2021

A 14-year-old female presents to her GP with shortness of breath and a feeling of her heart pumping too fast

A 14-year-old female presents to her GP with shortness of breath and a feeling of her heart pumping too fast. This had been ongoing for a few months. She has no past medical history. The significant findings on examination include a pansystolic murmur and widely split first and second heart sounds. The electrocardiogram (ECG) shows a rate of 200 beats, regular rhythm, and no P waves can be visualised.

Which of the following is the most likely underlying diagnosis?

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