What is it about?
A case of dual AV nodal non-reentrant tachycardia (double fire) treated long time for atrial fibrillation. The case is presented as a ECG/EP quiz. The correct diagnosis was suspected after carotid sinus massage and confirmed during EP study. Successful ablation was done.
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Why is it important?
This is the first report on using diagnostic carotid sinus massage in this rare tachycardia, dubbed as the 'great deceiver' or the 'great chameleon'. A positive response (as in the case described) could help in the differential diagnosis.
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This page is a summary of: Narrow QRS tachycardia with alternating R-R intervals - what is the mechanism?, Bulgarian Cardiology, January 2024, Pensoft Publishers,
DOI: 10.3897/bgcardio.29.e106912.
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