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  • Title: [AV reciprocating tachycardia with intermittent bundle branch block in latent Wolff-Parkinson-White syndrome].
    Author: Veress G.
    Journal: Orv Hetil; 1994 May 22; 135(21):1131-6. PubMed ID: 7910681.
    Abstract:
    This report deals with a patient with concealed Wolff-Parkinson-White syndrome in whom both narrow and wide QRS tachycardias were observed. The simultaneous occurrence of various QRS morphology during supraventricular tachycardia results in a challenging diagnostic ECG problem. The cycle length during tachycardia with left bundle branch block was longer than the cycle length during narrow QRS supraventricular tachycardia and with functional right bundle-branch block. Electrophysiologic studies revealed fixed V-A conduction time and increased V-A conduction during tachycardia with left bundle branch block. These studies suggested the presence of a concealed left-sided anomalous pathway. Differentiation between intra- and extranodal re-entry and therapeutic modalities are also discussed.
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