Alternative Energy Sources for Surgical Treatment of Atrial Fibrillation in Patients Undergoing Mitral Valve Surgery: Microwave Ablation vs Cryoablation
View Full Paper
Ask AI
Bookmark
Share
Key result
Microwave ablation showed a tendency toward more frequent late atrial fibrillation recurrence compared to cryoablation, with a 5-year AF-free rate of 61.3% vs 79.9% (HR 1.66).
Why the study?
Does microwave ablation compared to cryoablation improve freedom from atrial fibrillation in patients undergoing mitral valve surgery?
Population
340 consecutive patients with mitral valve disease and atrial fibrillation undergoing mitral valve surgery…
Comparison
Microwave ablation applied endocardially during… vs Cryoablation applied during concomitant maze…
Design
Cohort
Follow-up
mean 46.1±28.2 months
Authors
Discussion
Loading...
Member takes
Implication
May suggest higher late AF recurrence with microwave ablation in mitral valve surgery; hypothesis-generating, needs randomized confirmation.
Study Design
Type
Observational (n=340)
Multicenter
No
Structured PICO
Does microwave ablation compared to cryoablation improve freedom from atrial fibrillation in patients undergoing mitral valve surgery?
P
Population
340 consecutive patients with mitral valve disease and atrial fibrillation undergoing mitral valve surgery and concomitant maze procedure (mean age 50.0±12.5 years, 61.2% female) at a single center in South Korea.
I
Intervention
Microwave ablation (65 watts for 2 min per lesion) applied endocardially during concomitant maze procedure.
C
Comparator
Cryoablation (-60°C for 2 min per lesion) applied during concomitant maze procedure.
O
Outcome
Freedom from atrial fibrillation (AF) without antiarrhythmic agents (AF recurrence) at long-term follow-up.hard clinical
Main Result
Effect estimate: HR 1.66 (95% CI 0.89-3.07)
Absolute Event Rate: 61.3% vs 79.9%
p-value: p=0.089
In patients undergoing mitral valve surgery, microwave ablation results in shorter aortic clamping times but may be associated with a higher rate of late atrial fibrillation recurrence compared to cryoablation.
Limitations
- Retrospective observational study design
- Statistically marginal results requiring larger population or longer follow-up to verify
- Lack of online electrophysiologic evaluation during microwave ablation to verify transmural lesions acutely
- No histologic examinations of ablated atrial tissue to confirm transmural necrosis
- Statistically marginal results for the primary outcome
- Lack of online electrophysiologic evaluation during ablation to verify transmural lesions
Cite This Study
Kim et al. (2010) conducted an observational in Mitral disease and atrial fibrillation (n=340). Microwave ablation vs. Cryoablation was evaluated on 5-year AF-free rate (HR 1.66, 95% CI 0.89-3.07, p=0.089). Microwave ablation showed a tendency toward more frequent late atrial fibrillation recurrence compared to cryoablation, with a 5-year AF-free rate of 61.3% vs 79.9% (HR 1.66).
Topics
View Full Paper
Ask AI
Bookmark
Share