To study new maneuvers to differentiate AVNRT from orthodromic AVRT including VA interval variability at tachycardia induction, SA-VA base and local VA index (difference between local VA interval, measured on the coronary sinus catheter during tachycardia and entrainment, at the site of earliest atrial activity).
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To differentiate between narrow complex supraventricular tachycardia (AVNRT from orthodromic AVRT during electrothysiological study).
Timeframe: 24 months