title: [Relationship between conduction persistence through the slow pathway after atrioventricular nodal reentry tachycardia radiofrequency ablation and its recurrence].
abstract: OBJECTIVE
  The aim of this study is to verify whether the persistence of conduction over the slow pathway is related to an increased trend for recurrence.
  
  
  METHODS
  Recurrence rate was retrospectively analyzed in 126 patients who underwent slow pathway radiofrequency (RF) catheter ablation during a follow-up of 20 +/- 12 months. The ablative procedure was interrupted when AVNRT was no longer induced by atrial stimulation after intravenous infusion of isoproterenol. Ninety-eight patients had no evidence of slow pathway whereas 28 patients persisted with AV node jump and atrial echo beat.
  
  
  RESULTS
  There were 15 recurrences: 9% of those who had no evidence of slow pathway (9 of 98 patients) and 21% of those with AV node jump and/or atrial echo beat but this difference was not statistically significant.
  
  
  CONCLUSIONS
  As long as AVNRT cannot be induced by atrial pacing and isoproterenol infusion after slow pathway RF catheter ablation, the presence of AV node jump and/or atrial echo beat does not increase the risk of recurrence of AVNRT.
authors.affiliation: Instituto do Coração do Hospital das Clínicas da FMUSP.
authors.forename: M A
authors.initials: MA
authors.lastname: Silva
authors.forename: M I
authors.initials: MI
authors.lastname: Scanavacca
authors.forename: A
authors.initials: A
authors.lastname: D'Avila
authors.forename: R
authors.initials: R
authors.lastname: Kuniyoshi
authors.forename: E A
authors.initials: EA
authors.lastname: Sosa
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D017115:Catheter Ablation / Q000379:methods*; D002648:Child; D002675:Child, Preschool; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D008875:Middle Aged; D012008:Recurrence; D012189:Retrospective Studies; D013611:Tachycardia, Atrioventricular Nodal Reentry / Q000503:physiopathology / Q000601:surgery*; D016896:Treatment Outcome
vernacular_title: Relação entre a persistência da condução pela via lenta nodal após ablação de taquicardia por reentrada nodal e a recorrência clínica.