Key result
Increasing radiofrequency ablation to 4 seconds in rat atria slows conduction and reduces dominant frequency.
Why the study?
Antiarrhythmic drugs for AF are often ineffective, and the electrophysiological impact of different RFA time duration strategies required controlled analysis.
Does radiofrequency catheter ablation alter electrophysiological characteristics in isolated rat right atrium?
Does radiofrequency catheter ablation alter electrophysiological characteristics in isolated rat right atrium?
Increasing radiofrequency ablation time progressively alters electrophysiological parameters in isolated rat atria, with significant conduction block and signal fragmentation occurring after 2.5 seconds.
Answers are grounded in this paper and cite their sources.
Caution against extrapolating rat atrial findings to clinical ablation; leaves open need for in vivo validation.
Atrial fibrillation (AF) is the most common cardiac arrhythmia seen in clinical practice and its treatment by antiarrhythmic drugs is still non-effective. Radiofrequency catheter ablation (RFA) has been widely accepted as a strategy to prevent AF by creating myocardial lesions to block the AF electrical wavefront propagation and eliminate arrhythmogenic tissue. In this study, we analyzed the electrophysiological impact of different RFA time duration strategies through a controlled animal protocol. Electrical activity of the isolated right atrium of rats, under different RFA time strategies on the epicardium, was acquired during 4 s on the endocardium by electrical Mapping (EM) and simultaneously on the endocardium by Optical Mapping (OM), respectively. Analyses were concentrated on both time and frequency domain, through analysis of signal's morphology, local activation time, conduction velocity, dominant frequency (DF), and organization index (OI). The morphology of the optical and electrical signals was altered as the ablation time increased, making it difficult to identify activation times. Moreover, DF and OI decreased with increasing ablation time implied in fragmented electrograms. Through the characterization of traditional metrics applied to the electrical and optical data, it was possible to identify important changes, in time and frequency, inside the ablated regions.
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Paredes et al. (2020) studied Atrial Fibrillation (Ablation Model) (n=2). Radiofrequency ablation (RFA) vs. Baseline (pre-ablation) was evaluated on Electrophysiological characteristics (Conduction velocity, Dominant frequency, Organization index). Increasing radiofrequency ablation time up to 4 seconds in isolated rat atria altered signal morphology, decreased conduction velocity to 4.92-14.75 mm/s, and reduced dominant frequency.
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