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  • Title: Wide QRS tachycardia due to AV nodal reentry and a "bystander" bypass tract with slow conduction properties.
    Author: Deng Z, Gang ES, Rosenthal ME, Oseran D, Mandel WJ, Peter T.
    Journal: Pacing Clin Electrophysiol; 1986 Mar; 9(2):188-95. PubMed ID: 2419867.
    Abstract:
    An unusual mechanism for recurrent, wide QRS complex supraventricular tachycardia is described in this report. A 25-year-old man with normal PR and QRS intervals during sinus rhythm was shown to have preexcitation with a left bundle branch block pattern during tachycardia and during atrial pacing. Electrophysiologic studies demonstrated slow and decremental conduction properties in an accessory "bystander" AV pathway utilized for antegrade conduction during AV nodal reciprocating tachycardia. The differential diagnosis of this tachycardia is discussed in detail.
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