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  • Title: Carotid sinus massage induced elimination of rate related bundle branch block during paroxysmal atrial tachycardia: a simple method of proving bypass tract participation in the tachycardia.
    Author: Waxman MB, Wald RW, Bonet JF, Finley JP.
    Journal: J Electrocardiol; 1979 Oct; 12(4):371-6. PubMed ID: 512533.
    Abstract:
    Four cases of paroxysmal atrial tachycardia are described in whom rate related left bundle branch block (LBBB) was often present which persisted indefintely and showed no signs of spontaneous disappearance. Transient slowing of the tachycardia by carotid sinus massage in each case eliminated LBBB and this led to tachycardia acceleration. The tachycardia acceleration was traceable to a shortening in ventriculoatrial conduction. These observations proved the participation of a left sided bypass tract in the tachycardia circuit in each of these cases.
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