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Inclusion/Exclusion Criteria for the Prospective Study
Inclusion criteria:
Children undergoing ablation age 0–16 at the time of the ablation
Symptomatic paroxysmal tachycardia due to an accessory pathway (Wolff-Parkinson-White syndrome, concealed accessory pathway, or persistent junctional reciprocating tachycardia) or to atrioventricular node reentrant tachycardia
Otherwise normal heart
Exclusion criterion
Significant congenital heart disease, other than a small (hemodynamically insignificant) atrial septal defect, small (hemodynamically insignificant) ventricular septal defect, small (hemodynamically insignificant) patent ductus arteriosus or patent foramen ovale)