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Updated: May 15, 2026
09:17
High-Resolution Endocardial and Epicardial Optical Mapping in a Sheep Model of Stretch-Induced Atrial Fibrillation
Published on: July 29, 2011
Substrate of complex fractionated atrial electrograms: evidence by pathologic analysis.
De-jun You1, Dong Chang, Shu-long Zhang
1Department of Cardiology, 406th Hospital of Chinese People's Liberation Army, Dalian, Liaoning, China.
Chinese Medical Journal
|December 21, 2012
Summary
Complex fractionated atrial electrograms (CFAE) in atrial fibrillation (AF) are linked to disorganized heart muscle and more nerve tissue. This heterogeneity may explain CFAE and guide ablation therapy targets.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiac Anatomy
Background:
- Complex fractionated atrial electrograms (CFAE) are critical targets for atrial fibrillation (AF) ablation.
- Understanding the underlying substrate of CFAE is essential for improving ablation strategies.
Purpose of the Study:
- To investigate the myocardial and ganglionated plexus (GP) characteristics associated with CFAE.
- To elucidate the substrate responsible for CFAE in the context of AF.
Main Methods:
- AF was induced in mongrel dogs, and CFAE sites were identified and ablated.
- Atrial tissues from CFAE and non-CFAE sites were histologically analyzed for myocardial organization and GP distribution.
- Staining included hematoxylin-eosin (HE) and protein gene product 9.5 (PGP9.5) for neural markers.
Main Results:
- CFAE sites exhibited significantly more disorganized myocardium and interstitial tissue compared to non-CFAE sites.
- A significantly higher abundance of ganglionated plexuses (GPs) was observed in CFAE sites versus non-CFAE sites.
- Statistical analysis confirmed significant differences in both myocardial structure and GP density (P < 0.01).
Conclusions:
- Myocardial heterogeneity and altered GP distribution are identified as the substrate underlying CFAE.
- These findings suggest that the CFAE substrate can serve as a potential target for improved AF ablation therapies.
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