Inclusion Criteria:  Patients undergoing electrophysiologic study (EPS) for paroxysmal supraventricular tachycardia evidence of dual AV node pathway or atrioventricular nodal reentrant tachycardia (AVNRT) induction at EPS Attempt of AVNRT ablation with irrigated catheter and three-dimensionale electroanatomic mapping system  Exclusion Criteria:  Age <18 years Ablation with non-irrigated catheter Ablation without electroanatomic mapping system