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Narrow Irregular QRS Tachycardia with AV Dissociation: What Is the Mechanism?
Author(s) -
CASTILLO CASTILLO JESÚS,
PEÑAFIEL VERDÚ PABLO,
MARTÍNEZ SÁNCHEZ JUAN,
GARCÍA ALBEROLA ARCADI
Publication year - 2013
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1111/jce.12026
Subject(s) - medicine , palpitations , tachycardia , cardiology , electrophysiology study , sinus rhythm , electrophysiology , anesthesia , accessory pathway , qrs complex , sinus tachycardia , electrocardiography , atrial tachycardia , catheter ablation , ablation , atrial fibrillation
Arrhythmia Rounds . A 39‐year‐old woman with no structural heart disease and frequent episodes of sudden onset palpitations was referred for the electrophysiological study. During the study, a slightly irregular narrow QRS tachycardia with AV dissociation was repeatedly induced and spontaneously terminated. Apparently, irregular cycles and termination of the tachycardia were related to the dissociated sinus rhythm: atrial depolarizations timed when the AV junction was refractory were able to reset the tachycardia, while early atrial depolarizations caused its termination. This observation was enough to diagnose the tachycardia mechanism in our case. (J Cardiovasc Electrophysiol, Vol. 24, pp. 364‐366, March 2013)