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  • Title: One-year clinical outcome after pulmonary vein isolation using the second-generation 28-mm cryoballoon.
    Author: Metzner A, Reissmann B, Rausch P, Mathew S, Wohlmuth P, Tilz R, Rillig A, Lemes C, Deiss S, Heeger C, Kamioka M, Lin T, Ouyang F, Kuck KH, Wissner E.
    Journal: Circ Arrhythm Electrophysiol; 2014 Apr; 7(2):288-92. PubMed ID: 24610797.
    Abstract:
    BACKGROUND: The use of second-generation cryoballoon for pulmonary vein isolation in patients with paroxysmal atrial fibrillation has demonstrated encouraging acute and mid-term results. Long-term outcome data are not yet available. METHODS AND RESULTS: Fifty patients (18 women; mean age, 61±11 years; mean left atrial diameter, 43±5 mm) with paroxysmal (36 of 50 patients; 72%) or short-standing (<3-month duration) persistent atrial fibrillation (14 of 50 patients; 28%) underwent cryoballoon-based pulmonary vein isolation. Freeze cycle duration was 240 seconds. After successful pulmonary vein isolation, a bonus freeze was applied. Follow-up was based on outpatient clinic visits at 3, 6, and 12 months including Holter-ECGs and telephonic interviews. Recurrence was defined as a symptomatic or documented arrhythmia episode>30 seconds excluding a 3-month blanking period. A total of 192 pulmonary veins were identified, and 191 of 192 (99%) pulmonary veins were successfully isolated. Phrenic nerve palsy occurred in 1 of 50 (2%) patients. Follow-up was available for 49 of 50 (98%) patients with a mean follow-up duration of 440±39 days. Thirty-nine of 49 (80%) patients remained in stable sinus rhythm. Of 8 of 10 patients with arrhythmia recurrence, a second procedure using radiofrequency ablation demonstrated left atrial to pulmonary vein reconduction. CONCLUSIONS: The use of second-generation 28-mm cryoballoon for pulmonary vein isolation results in an 80% 1-year success rate.
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