Feasibility of a left atrial electrical disconnection procedure for atrial fibrillation using transcatheter radiofrequency ablation


Betts, T.R., Roberts, P.R. and Morgan, J.M. (2001) Feasibility of a left atrial electrical disconnection procedure for atrial fibrillation using transcatheter radiofrequency ablation. Journal of Cardiovascular Electrophysiology, 12, (11), 1278-1283. (doi:10.1046/j.1540-8167.2001.01278.x).

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Description/Abstract

INTRODUCTION:
Transcatheter Left Atrial Electrical Disconnection. An effective, catheter-based treatment for persistent atrial fibrillation (AF) remains elusive. This study assessed the feasibility of transcatheter left atrial (LA) electrical disconnection and its effect on AF inducibility.

METHOD AND RESULTS:
Thirteen anesthetized swine underwent noncontact mapping of the right atrium (RA) during coronary sinus (CS) pacing. Sites of earliest RA activation were identified using isopotential maps. An ablation catheter was navigated to these sites and a cluster of radiofrequency (RF) lesions applied until earliest activation shifted to a new site. The procedure was repeated until the atria were electrically disconnected. AF induction was attempted before and after ablation. Earliest RA activation was the CS os during proximal CS pacing and Bachmann's bundle during distal CS pacing. These two sites were successfully ablated in all 13 animals. Earliest activation then shifted to the fossa ovalis. RF energy was applied at a median of 2.5 sites (range 1 to 5) around the fossa, then at sites in the triangle of Koch, septum, cavotricuspid isthmus, and posterior wall. Atrial electrical disconnection was achieved in 10 of 13 animals (5 LA electrical disconnection, 3 RA electrical disconnection, 2 biatrial electrical disconnection with complete heart block). After atrial electrical disconnection, the LA became electrically silent. Before ablation, AF was inducible in every animal. After atrial electrical disconnection, AF was inducible in 3 of 10 animals.

CONCLUSION:
Atrial electrical disconnection is feasible using noncontact mapping and RF ablation. Successful electrical disconnection of the atria reduces AF inducibility. This approach is worthy of further evaluation as a management strategy for persistent AF, combined with device therapies.

Item Type: Article
ISSNs: 1045-3873 (print)
Related URLs:
Keywords: ablation, atrial fibrillation, arrhythmia, atrial electrical disconnection, mapping
Subjects: R Medicine > RD Surgery
Q Science > QP Physiology
Divisions: University Structure - Pre August 2011 > School of Medicine > Developmental Origins of Health and Disease
ePrint ID: 25253
Date Deposited: 10 Apr 2006
Last Modified: 27 Mar 2014 18:14
Contact Email Address: J.M.Morgan@soton.ac.uk
URI: http://eprints.soton.ac.uk/id/eprint/25253

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