Low recurrence rate in treating atrioventricular nodal reentrant tachycardia with triple freeze-thaw cycles

Muhammad Y. Qureshi, Christopher Ratnasamy, Mary Sokoloski, Ming Lon Young

Research output: Contribution to journalArticle

12 Scopus citations

Abstract

Background Cryoablation is an alternative to radiofrequency ablation in treating atrioventricular nodal reentrant tachycardia (AVNRT). However, its long-term effectiveness is in question when compared to radiofrequency ablation. We reviewed the results of cryoablation in children with AVNRT at our institute. Methods We performed a retrospective single-center chart review of consecutive patients ≤18 years of age with AVNRT who underwent cryoablation between January 2007 and August 2009. During cryoablation, a 6-mm-tip cryocatheter was used with temperature set to -80°C. Test lesions were performed at the presumed slow pathway location based on combined anatomic and electrophysiologic approach. If successful, ablation was then continued with triple freeze-thaw cycles (FTC) of 4 minutes each. Results A total of 53 patients (age range: 6.1-18.4 years, mean: 13.6 years, median: 13.2 years) underwent slow pathway modification with cryoablation. Acute success was achieved in 51 (96.2%) cases. Transient atrioventricular block was seen in 19 cases. The block occurred during FTC in eight patients (15%). The number of FTC was three in 47 (92.2%) patients. Less than three FTC were given in two patients due to transient heart block and four FTC were given in two patients with suspected catheter movement. Procedure duration was 177 ± 56 minutes; fluoroscopic time was 14 ± 11 minutes. Mean follow-up was 30.7 ± 10 (range 12-52, median 31) months. Recurrence of supraventricular tachycardia was seen in only one (1.96%) patient. Conclusions Triple FTC cryoablation lesions resulted in a low recurrence rate comparable to RF ablation in treating AVNRT without increased complications.

Original languageEnglish (US)
Pages (from-to)279-285
Number of pages7
JournalPACE - Pacing and Clinical Electrophysiology
Volume36
Issue number3
DOIs
StatePublished - Mar 1 2013

Keywords

  • ablation
  • atrioventricular nodal reentrant tachycardia
  • cryoablation
  • freeze-thaw cycles
  • pediatrics
  • supraventricular tachycardia

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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