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Cardiology Case Report: Overdose

Our latest cardiology case report from Brady Pregerson, MD, features a teenager brought to the emergency department for a suspected overdose. Check out the EKG and see if you can determine the correct diagnosis.

History: A teenager is brought to the hospital by ambulance with altered mental status. Family suspects an overdose. She is awake but tangential and bizarre and not providing a good history. Medics gave adenosine 6mg without notable effect.

Exam: Vital signs are normal except a pulse in the 160’s. The patient is awake and alert but confused and tangential, occasionally seeming to be murmuring to herself.

An EKG is done:

What is the most likely cause of the EKG findings in this patient?