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Just how stable are escape rhythms after atrioventricular junction ablation?
Rishi Arora1, Erica Spatz, Pugazhendhi Vijayaraman
1Northwestern University-Feinberg School of Medicine, Chicago, Illinois, USA.
Pacing and Clinical Electrophysiology : PACE
|May 22, 2010
Summary
Most patients (79%) have an escape rhythm after AV node ablation and pacemaker implantation. However, 28% develop labile escape rhythms, increasing pacemaker dependency risk.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Devices
Background:
- Atrioventricular (AV) node ablation with permanent pacemaker implantation is a standard treatment for atrial fibrillation.
- Concerns exist regarding long-term pacemaker dependency and potential pacemaker failure.
- Limited data are available on the lability of escape rhythms, a key indicator of pacemaker dependency.
Purpose of the Study:
- To characterize escape rhythms after AV node ablation and pacemaker implantation at serial time points.
- To identify risk factors associated with unstable (labile) escape rhythms.
Main Methods:
- Ninety-six patients undergoing AV node ablation and pacemaker implantation were studied.
- Escape rhythm presence/absence was assessed via pacemaker interrogation at five intervals.
- Baseline demographics and comorbidities were analyzed as potential predictors of labile escape rhythms.
Main Results:
- Immediately post-ablation, 79% of patients exhibited an underlying escape rhythm (≥30 bpm).
- While the overall percentage of patients with an escape rhythm increased over time, 28% showed labile rhythms (absent at some point).
- No significant predictors for labile escape rhythms were identified.
Conclusions:
- A stable escape rhythm was observed in 72% of patients long-term after AV node ablation and pacemaker implantation.
- A subset of patients remains at risk for pacemaker dependency due to absent or labile escape rhythms.
- Further monitoring is crucial for patients with labile escape rhythms post-ablation.
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