Temperature and impedance monitoring during radiofrequency catheter ablation of slow AV node pathway in patients with atrioventricular node reentrant tachycardia

Zu Chi Wen, Shih Ann Chen, Chern En Chiang, Ching Tai Tai, Shih Huang Lee, Yi-Jen Chen, Wen Chung Yu, Jin Long Huang, Mau Song Chang

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

This study was designed to observe the changes of temperature and impedance and to find the role of temperature control in radiofrequency ablation of slow pathways in patients with AV node reentrant tachycardia. Power, impedance and temperature were measured during each application of radiofrequency energy while the generator was operated in the power control mode. A total of 760 applications were delivered in 76 patients. The success rate was 100% without recurrence during a follow-up period of 8 ± 13 months. The mean catheter tip temperature associated with successful ablation was 51.3 ± 5.4°C (range 45°C to 64°C), and significantly higher than the unsuccessful pulses (48.7 ± 16.2°C, P <0.05). The mean temperature was 49.8 ± 3.1°C during accelerated junctional rhythm, significantly higher than the pulses without this rhythm. The mean temperature correlated well with early decrease of impedance (r = 0.71, P <0.001), and an early decrease of impedance more than 5 ohms had an 87% positive predictive value for adequate tissue heating. These data suggested that, if temperature monitoring was available, setting the target temperature at about 51°C could achieve adequate tissue heating for successful ablation of slow pathway; if not, impedance monitoring with an early decrease of impedance >5 ohms could predict adequate tissue heating.

Original languageEnglish
Pages (from-to)257-263
Number of pages7
JournalInternational Journal of Cardiology
Volume57
Issue number3
DOIs
Publication statusPublished - Dec 13 1996
Externally publishedYes

Keywords

  • AV node reentrant tachycardia
  • radiofrequency ablation
  • temperature monitoring

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine

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