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The impact of cryoballoon-based catheter ablation on left atrial structural and potential electrical remodeling in patients with paroxysmal atrial fibrillation

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Abstract

Background

While atrial fibrillation (AF) begets AF via structural, contractile, and electrical remodeling, it was shown that successful radiofrequency ablation of AF has effectively reversed left atrial (LA) remodeling. However, there was little data regarding the efficacy of cryoablation on LA remodeling. Herein, we aimed to assess the impact of cryoablation on LA structural and potential electrical remodeling in paroxysmal AF patients.

Methods

A total of 41 symptomatic patients with non-valvular paroxysmal AF underwent their first catheter ablation via cryoballoon technique. All patients had transthoracic echocardiography before, 6 and 12 months after cryoablation. LA volume index (LAVI), left intra-, right intra-, and inter-atrial electromechanical conduction delay (AEMD) were calculated in all patients. Postprocedural first 3 months was accepted as blanking period.

Results

All 179 pulmonary veins were isolated successfully in 41 patients with no major complication. During median 18 months (12–20 months) follow-up, recurrent atrial arrhythmia was found in nine patients (21.9 %). In multivariate Cox regression analysis, only early recurrence was found as the independent predictor of late recurrence. At 12th month visit compared to baseline, there was no change in LAVI (p = 0.647) but significant increase in left intra- and inter-AEMD (p < 0.05). However, in non-recurrent group, both LAVI (30.63 ± 3.6 to 28.42 ± 3.63, p < 0.001), left intra-AEMD (18.75 ± 8.77 to 12.5 ± 4.65, p < 0.001), and inter-AEMD (25.2 ± 13.2 to 18.84 ± 8.52, p < 0.001) were significantly decreased.

Conclusions

Our study findings revealed that successful cryoballoon-based AF ablation yields LA structural and potential electrical reverse remodeling. However, LA remodeling process cannot be halted by cryoablation in patients with AF recurrence during follow-up.

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Authors and Affiliations

  1. Department of Cardiology, Hacettepe University Faculty of Medicine, Ankara, Turkey

    Uğur Canpolat, Kudret Aytemir, Necla Özer & Ali Oto

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  1. Uğur Canpolat
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  4. Ali Oto
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Correspondence to Uğur Canpolat.

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Canpolat, U., Aytemir, K., Özer, N. et al. The impact of cryoballoon-based catheter ablation on left atrial structural and potential electrical remodeling in patients with paroxysmal atrial fibrillation. J Interv Card Electrophysiol 44, 131–139 (2015). https://doi.org/10.1007/s10840-015-0041-1

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