Ablation therapy for left atrial autonomic modification.

Area of Science:

• Cardiology
• Neuroscience
• Medical Physiology

Background:

• The autonomic nervous system plays a role in atrial fibrillation (AF) pathogenesis.
• Neural targeting strategies for AF therapy are underexplored.
• Conventional methods for locating ganglionated plexi (GPs) rely on inducing AV block, which may not always be effective.

Purpose of the Study:

• To investigate specific left atrial ganglionated plexi (GP) sites that trigger atrial ectopy.
• To determine if continuous stimulation of these sites induces AV block.
• To evaluate the efficacy of ablating these ectopy-triggering GP (ET-GP) sites for AF treatment.

Main Methods:

• Stimulation of specific left atrial GP sites.
• Monitoring for induced atrial ectopy and AV block.
• Ablation of identified ET-GP sites or adjacent pulmonary veins (PVs).

Main Results:

• Short bursts of stimulation at specific left atrial GP sites triggered fibrillation-inducing atrial ectopy.
• Continuous stimulation of these ET-GP sites did not consistently induce AV block.
• Ablation at ET-GP sites or between the ET-GP and PV rendered these sites inactive.
• ET-GP sites demonstrated anatomical stability.

Conclusions:

• Specific left atrial GP sites can be identified by their ability to trigger ectopy, not solely by AV block.
• Ablation of these identified ET-GP sites is a potential therapeutic approach for paroxysmal AF.
• These findings may inform personalized ablation strategies for AF patients.