Abstract
Background
Pulmonary vein isolation (PVI) using the second-generation cryoballoon (CB2) in patients with paroxysmal and persistent atrial fibrillation (AF) has demonstrated encouraging acute and mid-term results. Follow-up data on outcome beyond 1-year is lacking. The purpose of this analysis was to investigate the 2-year clinical outcome after CB2-based PVI.
Methods
Sixty patients (age 62 ± 11 years) with paroxysmal [45/60 (75 %) patients] or short-standing persistent AF [15/60 (25 %) patients] underwent 28-mm CB2-based PVI. Freeze-cycle duration was 240 s. After successful PVI, a bonus freeze-cycle of the same duration was applied. Follow-up was based on outpatient clinic visits at 3, 6, 12, 18, and 24 months including 24 h Holter-ECGs and telephone interviews. Recurrence was defined as any symptomatic and/or documented atrial tachyarrhythmia (ATA) episode >30 s following a 3-month blanking period.
Results
A total of 231 pulmonary veins (PV) were identified and 230/231 (99.6 %) PVs were successfully isolated. Phrenic nerve palsy occurred in 2/60 (3.3 %) patients. No other periprocedural complications occurred. Follow-up was available for 59/60 (98 %) patients with a mean duration of 838 ± 67 days. A total of 43/59 (73 %) patients remained in stable sinus rhythm. In 10/16 (63 %) patients with ATA recurrence, a repeat procedure was performed using radiofrequency energy. The overall success rate after a maximum of two ablation procedures and a follow-up period of 838 ± 67 days was 88 % (52/59) patients.
Conclusions
Patients with paroxysmal or short-persistent AF undergoing PVI using the 28-mm CB2 demonstrated a 73 % 2-year single-procedure clinical success rate.
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A. Metzner received speaker’s honoraria from Medtronic. E. Wissner received speaker’s honoraria from Medtronic and is a member of Medtronic’s advisory board. K.-H. Kuck received a Research Grant and speaker’s honoraria from Medtronic. All other authors have no relevant disclosures.
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A. Metzner and C.-H. Heeger contributed equally.
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Metzner, A., Heeger, CH., Wohlmuth, P. et al. Two-year outcome after pulmonary vein isolation using the second-generation 28-mm cryoballoon: lessons from the bonus freeze protocol. Clin Res Cardiol 105, 72–78 (2016). https://doi.org/10.1007/s00392-015-0890-8
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DOI: https://doi.org/10.1007/s00392-015-0890-8