I am a new Nurse Practitioner Who started working for a card | Figure 1

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I am a new Nurse Practitioner Who started working for a cardiologist who specializes in electrophysiology. This is an electrogram of a patient who had a recent EP study. According to my very experienced cardiologist this is something he has not seen in a long time. Any thoughts on what the rhythm is? And where it originated from?

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Follow up from an earlier post. This is the 15 y/o female patient with HCOM who had a wide complex tachycardia. Baseline ECG.](https://app.figure1.com/case-detail/2f63fe4e-c1e1-449d-bfa6-611f3325285c)

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