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Cryoablation versus radiofrequency ablation of atrioventricular nodal reentrant tachycardia

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Abstract

Background

Ablation of the slow pathway is an established cure for atrioventricular nodal reentrant tachycardia (AVNRT). Periprocedural damage to the conduction system is a major concern during AVNRT ablation, and cryoablation (CRYO) has been suggested to improve the procedural safety compared to standard radiofrequency (RF) ablation, without reducing the procedural success.

Objective

We performed a systematic review and meta-analysis of studies comparing CRYO with RF ablation of AVNRT.

Methods

We searched PubMed, CENTRAL, the BioMed Central, EMBASE, CardioSource, clinicaltrials.gov, and ISI Web of Science (January 1980 to July 2013). No language restriction was applied. Two independent reviewers screened titles and abstracts to identify studies that compared the procedural outcomes of AVNRT ablation with either CRYO or RF energy. Two independent reviewers assessed the risk of bias according to the Cochrane Collaboration, and extracted patient, study characteristics, and procedural outcome data. Results are expressed as odds ratio (OR) or as weighted mean difference (WMD) with their 95 % confidence interval (CI).

Results

Fourteen studies (5 prospective randomized and 9 observational) with 2,340 patients (mean age range 13 to 53 years, 1,522 (65 %) females) were included in the analysis. RF ablation was performed in 1,262 (54 %) patients, while CRYO in 1,078 (46 %) patients. Acute success (abolition of dual atrioventricular node physiology or single echo beats) was achieved in 88 % of patients treated with RF versus 83 % of those treated with CRYO (OR = 0.72, 95 % CI 0.46 to 1.13; P = 0.157). RF ablation was associated with shorter total procedure time (WMD = −13.7 min, 95 % CI −23 to −4.3 min; P = 0.004), but slightly longer fluoroscopy time (WMD = +4.6 min 95 % CI +1.7 to +7.6 min; P = 0.002). Permanent atrioventricular block occurred in 0.87 % RF cases and in no CRYO case (OR = 3.60, 95 % CI 1.09 to 11.81; P = 0.035). Over a median follow-up of 10.5 months (range 6 to 12 months), freedom from recurrent AVNRT was 96.5 % in the RF group versus 90.9 % in the CRYO group (OR = 0.40, 95 % CI 0.28 to 0.58; P < 0.001). At meta-regression analysis, no clinical or procedural variable had a significant interaction with the results above.

Conclusions

In patients undergoing AVNRT ablation, RF significantly reduces the risk of long-term arrhythmia recurrence compared to CRYO, but is associated with a higher risk of permanent atrioventricular block.

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Authors and Affiliations

  1. Cardiac Arrhythmia Service, Stanford University School of Medicine, 300 Pasteur Drive H 2146, Stanford, CA, 94305, USA

    Pasquale Santangeli

  2. Texas Cardiac Arrhythmia Institute, St. David’s Medical Center, Austin, TX, USA

    Luigi Di Biase, Rong Bai & Andrea Natale

  3. University of Foggia, Foggia, Italy

    Pasquale Santangeli & Luigi Di Biase

  4. Ospedale Sacco, Milan, Italy

    Riccardo Proietti

Authors
  1. Pasquale Santangeli
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  2. Riccardo Proietti
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  4. Rong Bai
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  5. Andrea Natale
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Correspondence to Pasquale Santangeli.

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Santangeli, P., Proietti, R., Di Biase, L. et al. Cryoablation versus radiofrequency ablation of atrioventricular nodal reentrant tachycardia. J Interv Card Electrophysiol 39, 111–119 (2014). https://doi.org/10.1007/s10840-013-9842-2

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  • DOI: https://doi.org/10.1007/s10840-013-9842-2

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