Electrophysiological differences between the epicardium and the endocardium of the left atrium.

ABSTRACT:

Background

Electrophysiological properties of the atrial endocardium compared to epicardium are not well understood. The purpose of this study was to compare the electrophysiological properties and vulnerability to arrhythmia induction from these regions.

Methods and results

Transseptal endocardial and percutaneous epicardial mapping were performed in a porcine model (n = 7). Two opposing 4-mm electrophysiological catheters were positioned endocardially and epicardially. A circular mapping catheter (CMC) was positioned at the ostium of the common inferior pulmonary vein (CIPV) recording left atrial (LA)-PV potentials. Endocardial and epicardial effective refractory periods (ERPs) at two basic cycle lengths (CLs) of 600 and 400 ms were recorded from four anatomic locations (C

SUBMITTER: Michowitz Y 

PROVIDER: S-EPMC3018569 | biostudies-literature | 2011 Jan

REPOSITORIES: biostudies-literature