6th March 2024

A 35-year-old female presents to ED and gives a history of her heart suddenly pounding.

A 35-year-old female presents to ED and gives a history of her heart suddenly pounding. You try to establish more detail; she feels that her heart is beating very fast but regular and forceful, not only in her chest but also her neck. Her heart rate is sitting at around 180 bpm. You notice rapid pulsations in her neck which are reduced on palpation. What is the most likely underlying mechanism?

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