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.