Case Presentation: A 24-year-old female with unremarkable past medical history, presented to urgent care for two days of tachycardia, chest tightness, sore throat, and fever. She was found to be in supraventricular tachycardia with a heart rate (HR) of 180 bpm. Patient received adenosine 6mg and then 12mg with improvement of HR to 140 bpm. [...]