Mayo Clinic specialists are discussing the combination of pulsed field ablation and left atrial appendage occlusion to treat patients with atrial fibrillation [1].

This procedural approach is significant because it aims to reduce peridevice leaks. These leaks are associated with an increased risk of stroke in patients undergoing appendage occlusion [2].

Dr. Ammar Killu and Dr. Anthony Kashou said the rationale for this combined strategy during an interview for the "Interviews with the Expert: ECG Making Waves" series [1]. The doctors focused on the advantages of pulsed field ablation, known as PFA, over conventional thermal ablation methods [1].

Unlike thermal ablation, which relies on extreme heat or cold to destroy tissue, PFA uses non-thermal, tissue-selective electrical fields [1]. This selectivity allows clinicians to target specific cardiac cells while minimizing damage to surrounding structures, a critical factor when performing occlusion procedures in the left atrium [1].

Combining these two interventions allows for a more comprehensive treatment of the heart's electrical instability while simultaneously addressing the risk of blood clots forming in the atrial appendage [2]. The experts said the non-thermal nature of PFA may contribute to better outcomes regarding the seal of the occlusion device [2].

Procedural considerations include the timing and sequence of the ablation and occlusion. By utilizing PFA, surgeons may achieve a more precise ablation of the pulmonary veins without the collateral thermal damage that can sometimes complicate the placement of an occlusion device [1].

These discussions reflect a broader shift toward more selective energy sources in cardiac electrophysiology. The goal is to improve the safety profile of atrial fibrillation treatments while lowering the incidence of long-term complications such as stroke [1, 2].

“Combining PFA with LAAO may reduce peridevice leaks, which are associated with higher stroke risk.”

The shift toward pulsed field ablation represents a transition from thermal-based tissue destruction to a more precise, electric-field approach. By pairing this technology with left atrial appendage occlusion, clinicians are attempting to solve two problems at once: correcting the heart's rhythm and preventing the formation of clots. If PFA consistently reduces peridevice leaks, it could establish a new standard of care that lowers the stroke risk for high-risk atrial fibrillation patients.