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  • Title: Nonreentrant supraventricular tachycardia misdiagnosed as inappropriate sinus tachycardia.
    Author: Bhatt AG, Monahan KM.
    Journal: Pacing Clin Electrophysiol; 2011 Aug; 34(8):e70-3. PubMed ID: 20487362.
    Abstract:
    We report a case of a woman with incessant palpitations initially misdiagnosed as inappropriate sinus tachycardia that proved refractory to β-blockers. At the time of electrophysiologic testing, a sustained narrow-complex tachycardia with a 1:2 atrioventricular relationship was repeatedly initiated by a posterior fascicle depolarization induced by means of a timed ventricular extrastimulus. The tachycardia was repeatedly terminated with a timed atrial extrastimulus, which excluded junctional bigeminy and confirmed the diagnosis of nonreentrant supraventricular tachycardia. Catheter ablation of the slow pathway eliminated dual-pathway conduction and tachycardia.
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