Temperature monitoring in radiofrequency catheter ablation of atrial flutter using the linear ablation technique

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

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Introduction: Information about temperature and impedance monitoring during radiofrequency catheter linear ablation of atrial flutter has not been reported. We proposed that a radiofrequency catheter ablation system using a closed-loop temperature control model could decrease the incidence of coagulum formation and shorten the radiation exposure and procedure times compared with those found in a power control model. Methods and Results: Forty patients (8 women and 32 men; mean age 64 ± 7 years) with atrial flutter were referred for radiofrequency ablation. The patients were randomized into two groups: group I patients underwent radiofrequency catheter linear ablation of atrial flutter using a power control of energy output model; and group II patients underwent the closed-loop temperature control model with a target electrode temperature of 70°C. As compared with group II, group I patients had a higher incidence of coagulum formation (12% vs 2%, P <0.05), temperature shutdown (11% vs 0%, P <0.01), and impedance shutdown (16% vs 3%, P <0.01), more radiofrequency applications (7 ± 3 vs 4 ± 2, P <0.01), and longer procedure time (100 ± 25 vs 75 ± 23 minutes, P <0.05) and radiation exposure time (31 ± 10 vs 20 ± 7 minutes, P <0.05) required for successful ablation. Larger deviations of temperature (9.0° ± 2.4°C vs 5.0° ± 1.2°C, P <0.0001) and impedance (9.2 ± 2.6 Ω vs 5.3 ± 1.6 Ω, P <0.0001) were also found in group I patients compared with those in group II. Conclusions: This study demonstrated that a closed-loop temperature control model could facilitate the effects of radiofrequency catheter ablation of the atrial flutter circuit by decreasing coagulum formation, temperature and impedance shutdown, and procedure and radiation exposure times.

Original languageEnglish
Pages (from-to)1050-1057
Number of pages8
JournalJournal of Cardiovascular Electrophysiology
Volume7
Issue number11
Publication statusPublished - 1996
Externally publishedYes

Keywords

  • atrial flutter
  • catheter ablation
  • radiofrequency
  • temperature control

ASJC Scopus subject areas

  • Cardiology and Cardiovascular Medicine
  • Physiology

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    Wen, Z. C., Chen, S. A., Tai, C. T., Chiang, C. E., Lee, S. H., Chen, Y. J., Yu, W. C., Huang, J. L., & Chang, M. S. (1996). Temperature monitoring in radiofrequency catheter ablation of atrial flutter using the linear ablation technique. Journal of Cardiovascular Electrophysiology, 7(11), 1050-1057.