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A 5yo girl comes in for chest pain for 6 hours and is noted to have a heart rate of 250 that is not varying. Review of the electronic medical record reveals a history of WPW. Mom says she has not had an episode of fast heart rate since age 3 weeks when she was first diagnosed. She is not on any medications. She is awake and alert, and her blood pressure is 85/45.


What is your best next course of action?