What is a defining characteristic of the CFAE signal regarding its duration?

The defining characteristic of the CFAE (Complex Fractionated Atrial Electrograms) signal is that it typically has a duration of longer than 50 ms. This characteristic helps to distinguish CFAE from other atrial signals and is significant in the context of atrial fibrillation management and ablation procedures.

CFAE signals are associated with regions of the atria that demonstrate complex and disorganized electrical activity, which can play a role in the maintenance of atrial fibrillation. The longer duration of these signals is indicative of their complexity and the presence of fractionation, which means that these signals often have multiple components within a single heartbeat cycle. This contrasts with normal atrial signals which generally have shorter durations.

Understanding this duration characteristic is crucial for electrophysiologists when they are mapping the left atrium for potential ablation targets to interrupt the perpetuation of atrial fibrillation. Recognizing CFAE based on its duration and complexity allows for more effective treatment strategies in managing this arrhythmia.