Two patients with symptomatic fast/slow pathway double responses were evaluated with electrophysiology studies. Chronic palpitations were resistant or worsened by medical therapy. No reentry tachycardias were induced. A nonreentrant paroxysmal supraventricular tachycardia was documented. Radiofrequency ablation of the slow pathway was safely and successfully performed. Patients remain asymptomatic for 16-18 months. Ablation of the slow pathway for this substrate is a viable option.
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