STAT ECG Diagnoses: what to look for on the ECG after synchronized cardioversion

ECG Weekly Workout with Dr. Amal Mattu


A 44-year-old male presents to the ED with palpitations and shortness of breath. He is found to have a narrow complex regular tachycardia at 230 bpm. The rhythm is most consistent with SVT and successfully cardioverts with valsalva maneuvers. The following post cardioversion ECG is obtained:

Before watching the video, look closely at this ECG and ask yourself:

    1. What is your full ECG interpretation?
    2. What is the most likely cause of the intermittent aberrantly conducted beats?