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Case Report: Dizziness, Palpitations, and Shortness of Breath

This case report from Brady Pregerson, MD, features a man in his 40s presenting with dizziness, palpitations, and shortness of breath. Check out the EKG and determine the correct diagnosis.


A man in his 40’s presents to the emergency department with palpitations, shortness of breath, and feeling a bit dizzy. He states everything started suddenly about 2 hours ago while preparing his lunch and he has never felt this way before. He denies any chest pain or pressure, syncope or near syncope, or other complaints.


Vital signs were normal except for a pulse rate of 201. Physical exam was normal except for tachycardia and slight tremor.

An EKG is done:

What is the most likely diagnosis?