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Treatment of atrioventricular nodal re-entrant tachycardia by cryoablation with an 8-mm-tip catheter versus radiofrequency ablation

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Journal of Interventional Cardiac Electrophysiology Aims and scope Submit manuscript

Abstract

Purpose

Catheter cryoablation (CRYO) may eliminate inadvertent atrioventricular block (AVB) in the treatment of atrioventricular nodal reentrant tachycardia (AVNRT). However, higher recurrence was observed with CRYO delivered by 4 mm or 6 mm-tip catheter. This study was performed to investigate whether a comparably low treatment failure and recurrence rate as in radiofrequency (RF) ablation is achievable by CRYO with an 8-mm-tip catheter.

Methods

This is a retrospective case–control study including 40 patients with AVNRT treated with CRYO (n = 20) using an 8 mm-tip catheter or RF ablation (n = 20) from March 2009 to March 2011. Treatment failure was defined as the composite of acute procedural failure including inadvertent permanent AVB and documented recurrence.

Results

Acute procedural success of 90% (18/20) and 95% (19/20) were achieved in CRYO and RF ablation group, respectively (p = 0.998), with no permanent AVB in either group. With Kaplan–Meier analysis, there was no significant difference between the treatment groups in terms of recurrence rate (5.6% [1/18] vs. 0%; log-rank test p = 0.304) and treatment failure (15% [3/20] vs. 5% [1/20]; log-rank test p = 0.301). Shorter fluoroscopy time (15 ± 8.6 vs. 25.2 ± 12.1 min; p = 0.005) and more energy applications (median 4 [2–15] vs. 2 [1–8]; p = 0.005) were observed in the CRYO group compared with RF ablation group.

Conclusions

Compared to RF ablation, CRYO with an 8-mm-tip catheter for treating AVNRT achieves a comparable acute procedural success, comparably low recurrence rate and composite endpoint of treatment failure. Shorter fluoroscopy time and more energy applications were observed in the CRYO group.

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Authors and Affiliations

  1. Princess Margaret Hospital, 2-10 Princess Margaret Hospital Road, Lai Chi Kok, Kowloon, Hong Kong

    Ngai-yin Chan, Ngai-shing Mok, Chi-chung Choy, Chun-leung Lau, Pui-shan Chu, Ho-chuen Yuen & Suet-ting Lau

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  1. Ngai-yin Chan
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  2. Ngai-shing Mok
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  3. Chi-chung Choy
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  4. Chun-leung Lau
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Correspondence to Ngai-yin Chan.

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Chan, Ny., Mok, Ns., Choy, Cc. et al. Treatment of atrioventricular nodal re-entrant tachycardia by cryoablation with an 8-mm-tip catheter versus radiofrequency ablation. J Interv Card Electrophysiol 34, 295–301 (2012). https://doi.org/10.1007/s10840-012-9670-9

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  • DOI: https://doi.org/10.1007/s10840-012-9670-9

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