Published in:
Open Access 05-05-2023 | Resting ECG | Rhythm Puzzle – Answer
A young man with DiGeorge syndrome and tachycardia
Published in: Netherlands Heart Journal | Issue 9/2023
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The 12-lead resting electrocardiogram (ECG) (Fig. 1) shows a broad QRS complex tachycardia, which is due to a supraventricular tachycardia with the pre-existing right bundle branch block. The underlying rhythm is a junctional ectopic tachycardia (JET). Further dissection of the rhythm shows an atrioventricular (AV) dissociation with a ventricular rhythm of 140 bpm and an atrial rhythm of around 95 bpm (Fig. 1, arrows). The slight irregularity in the rhythm is due to occasional capture/fusion beats (Fig. 1, asterisk).
Fig. 1
12-lead resting electrocardiogram performed at the emergency department. The arrows show the hidden sinus P waves. The asterisks show fusion/capture beats. The hashtags show the beats that would have reset the tachycardia if there had been retrograde conduction
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