Background: Pulmonary vein isolation (PVI) is a cornerstone of catheter ablation in patients with paroxysmal atrial fibrillation, and balloon-based ablation has been recently performed worldwide. The second-generation cryoballoon (CB2) ablation has proven to be highly effective in achieving freedom from paroxysmal atrial fibrillation. However, there are some debatable questions, including the ideal number of freeze cycles.
Methods: The AD-Balloon study (Multicenter Study of the Validity of Additional Freeze Cycles for Cryoballoon Ablation) was designed as a prospective, multicenter, and randomized clinical trial for investigation of the optimal strategy of freeze cycles for the CB2 ablation. One hundred and ten consecutive patients (aged 64±11 years) were randomly assigned to 2 groups after achieving a PVI by the CB2 ablation: 3-minute freeze cycles were added to each pulmonary vein (AD group: n=55) or not (non-AD group: n=55). Delayed-enhancement magnetic resonance imaging was also performed 1 to 2 months after the PVI to assess the ablation lesions.
Results: The patient characteristics did not differ between the 2 groups. A complete PVI was achieved in all patients. The total number of freeze cycles and durations for all pulmonary veins were significantly shorter in the non-AD group than in the AD group (5.7±1.6 versus 9.1±1.6 cycles, P<0.0001, and 932±244 versus 1483±252 seconds, P<0.0001). The cumulative freedom from any atrial tachyarrhythmia at 1 year was 87.3% in the AD group and 89.1% in the non-AD group (log-rank test P=0.78). There was no significant difference in the frequency of gaps on the PVI lines in the delayed-enhancement magnetic resonance imaging (46% in the AD group versus 36% in the non-AD group; P=0.38).
Conclusions: No benefit was found in the patients receiving additional 3-minute freeze cycles after the complete PVI with the CB2 ablation, suggesting that an insurance freeze after achieving a PVI with the CB2 may be unnecessary and time consuming.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1161/CIRCEP.118.006989 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Frozen versus fresh embryo transfer in women with low prognosis for in vitro fertilisation treatment: pragmatic, multicentre, randomised controlled trial.
BMJ
January 2025
State Key Laboratory of Reproductive Medicine and Offspring Health, Centre for Reproductive Medicine, Institute of Women, Children and Reproductive Health, Shandong University, Jinan, China
Objective: To test the hypothesis that a freeze-all strategy would increase the chance of live birth compared with fresh embryo transfer in women with low prognosis for in vitro fertilisation (IVF) treatment.
Design: Pragmatic, multicentre, randomised controlled trial.
Setting: Nine academic fertility centres in China.
Zn(TFSI)-Mediated Ring-Opening Polymerization for Electrolyte Engineering Toward Stable Aqueous Zinc Metal Batteries.
Nanomicro Lett
January 2025
Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Institute of New Energy, iChEM (Collaborative Innovation Center of Chemistry for Energy Materials), Fudan University, Shanghai, 200433, People's Republic of China.
Practical Zn metal batteries have been hindered by several challenges, including Zn dendrite growth, undesirable side reactions, and unstable electrode/electrolyte interface. These issues are particularly more serious in low-concentration electrolytes. Herein, we design a Zn salt-mediated electrolyte with in situ ring-opening polymerization of the small molecule organic solvent.
View Article and Find Full Text PDFA Decade of Oocyte Cryopreservation: New Horizons in Patients Accessing Care.
J Womens Health (Larchmt)
January 2025
Reproductive Medicine Associates of NY, New York, NY, USA.
Utilization of fertility preservation treatments has increased since the American Society for Reproductive Medicine lifted the "experimental" label for oocyte cryopreservation in 2012. This study characterizes changes in insurance coverage, clinical outcomes, and live birth probabilities over a span of a decade (2012-2022) in patients who underwent planned oocyte cryopreservation. Retrospective analysis of planned oocyte cryopreservation cycles using vitrification from 2012 to 2022.
View Article and Find Full Text PDFA Qualitative Exploration of Emotional Experiences in Patients with Thin Endometrium Undergoing Repeated Cancellations of Frozen-Thawed Embryo Transfer Cycles.
Int J Womens Health
January 2025
Reproductive Medicine Center, Sir Run Run Shaw Hospital, College of Medicine, Zhejiang University, Hangzhou City, Zhejiang Province, People's Republic of China.
Objective: The aim of this study was to investigate the emotional experience of patients with thin endometrium (TE) who have repeatedly cancelled their cycles due to unsuitability for embryo implantation during the endometrial preparation phase of freeze-thaw embryo transfer (FET). The overall aim is to improve management strategies and quality of life for these patients.
Methods: A descriptive phenomenological methodology was utilized to conduct in-depth, semi-structured interviews with ten patients diagnosed with TE who had experienced repeated FET cancellations between January and June 2024.
Lignin-containing nanofiber-reinforced flexible strain sensors with excellent mechanical properties and ionic conductivity for human motion detection.
Int J Biol Macromol
January 2025
Tianjin Key Laboratory of Pulp and Paper, Tianjin University of Science and Technology, Tianjin 300457, China. Electronic address:
A multifunctional hydrogel with outstanding mechanical properties and excellent ionic conductivity holds immense potential for applications in various fields, such as healthcare monitoring, and various devices, such as wearable devices and flexible electronics. However, developing hydrogels that combine high mechanical strength with efficient electrical conductivity remains a considerable challenge. Herein, an ion-conductive hydrogel with excellent mechanical properties and ionic conductivity is successfully created.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!