Epicardial Fat Pad
Accumulations of adipose tissue on the epicardial surface containing autonomic nerve fibers that can trigger atrial arrhythmias.
Full Definition
Epicardial fat pads are collections of adipose tissue located on the epicardial surface of the heart, particularly around the pulmonary veins and left atrium. These structures contain clusters of autonomic nerve fibers (ganglionated plexi) that can serve as triggers for atrial fibrillation and other atrial arrhythmias. During ablation procedures, these fat pads may be targeted with radiofrequency energy to achieve autonomic denervation. The fat pads can be identified by their characteristic appearance on imaging and their response to high-frequency stimulation during electrophysiology procedures.
Usage
Usage note: Often targeted for autonomic modulation during atrial fibrillation ablation procedures.
In Context
- "High-frequency stimulation of the epicardial fat pad induced atrial fibrillation, confirming its role as a trigger site." — Ablation report
- "The posterior fat pad was identified and ablated until loss of vagal response was achieved." — Operative note