Key result
Empirical linear ablation risks incomplete block in persistent AF, while combined mapping may identify ablation targets.
Why the study?
Do additional substrate modification strategies improve outcomes compared to pulmonary vein isolation alone in patients with persistent atrial fibrillation?
Do additional substrate modification strategies improve outcomes compared to pulmonary vein isolation alone in patients with persistent atrial fibrillation?
This review highlights that while substrate modification is frequently performed during persistent AF ablation, current techniques (linear, CFAE, rotor ablation) have significant limitations and unproven long-term efficacy, necessitating further randomized validation.
Avoid empirical linear ablation in persistent AF; combined mapping approaches remain hypothesis-generating pending randomized validation.
Catheter ablation of atrial fibrillation (AF) has evolved over the past 20 years from being a novel, unproven procedure to a commonly performed procedure. Triggers are important for the initiation of AF and a suitable substrate is important for perpetuation of AF. Remodeling, including electrical and structural remodeling, is common in patients with persistent AF. Therefore, targeting the remodeled atrium is a critical issue during persistent AF ablation. However, ablation outcomes remain suboptimal despite aggressive substrate modification. Empirical linear ablation is not recommended because of the difficulty in achieving complete linear block and it is recommended only if macroreentry tachycardia develops during the procedure. Complex fractionated atrial electrogram (CFAE) ablation is recommended in the Heart Rhythm Society Consensus Document but efficacy has been limited in long-term follow-up studies. Rotor ablation is controversial. A combined approach using CFAE, similarity and phase mappings with rotor identification may be helpful in searching for AF sources and subsequent substrate ablation. Nevertheless, more prospective randomized studies are required to validate efficacy and safety.
No takes yet. Share an insight, caveat, or question.
Lo et al. (2016) conducted a review in Persistent Atrial Fibrillation. Catheter ablation (substrate modification strategies) was evaluated. In patients with persistent atrial fibrillation, empirical linear ablation is not recommended due to difficulty achieving complete block, whereas a combined approach using CFAE, similarity, and phase mapping may help identify ablation targets.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: