History
A 19-year-old female with no significant medical history presented with
palpitations. A day before presentation she reported blunt chest trauma
when someone fell onto her chest. Following this, she continued to have
mild chest discomfort and intermittent palpitations. She noticed that
her Apple Watch showed heart rate over 200 bpm and this prompted her to
come to the emergency room (ER). In the ER, she was found to have
supraventricular tachycardia (SVT) with heart rate 218 bpm unresponsive
to vagal maneuvers (Figure 1A). Ultimately, sinus rhythm was restored
after intravenous administration of adenosine and beta blockers (Figure
1B). She reported a short-lasting episode of palpitations three months
prior to this presentation that resolved on its own.