Electrophysiologic studies in a 25-year-old man with wide QRS tachycardia demonstrated slow and decremental conduction in a bystander AV pathway during AV nodal reciprocating tachycardia.
Case Report (n=1)
This case report describes an unusual mechanism for wide QRS tachycardia involving AV nodal reentry with antegrade conduction over a bystander accessory pathway with slow conduction properties.
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.
Deng et al. (Sat,) conducted a case report in Recurrent, wide QRS complex supraventricular tachycardia (n=1). Electrophysiologic studies was evaluated on Mechanism of tachycardia. Electrophysiologic studies in a 25-year-old man with wide QRS tachycardia demonstrated slow and decremental conduction in a bystander AV pathway during AV nodal reciprocating tachycardia.