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Characterization of Atrial Activation (A‐A) Intervals During Atrial Fibrillation Due to a Single Driver: Do They Reflect Atrial Effective Refractory Periods?
Author(s) -
SAHADEVAN JAYAKUMAR,
RYU KYUNGMOO,
MATSUO KUNIHIRO,
KHRESTIAN CELEEN M.,
WALDO ALBERT L.
Publication year - 2011
Publication title -
journal of cardiovascular electrophysiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.193
H-Index - 138
eISSN - 1540-8167
pISSN - 1045-3873
DOI - 10.1111/j.1540-8167.2010.01874.x
Subject(s) - atrial fibrillation , medicine , cardiology , refractory period , reentry , atrial tachycardia , p wave , anesthesia , catheter ablation
Characterization of Atrial Activation Intervals During AF . Background: The mean, median, and minimum local atrial activation (A‐A) intervals have been used to determine the local atrial effective refractory period (AERP) during atrial fibrillation (AF), the underlying assumption being that AF is due to multiple reentrant wavelets. Objective: We tested the hypothesis that when AF is due to a single, rapid, stable reentrant circuit (driver), the minimum and mean local A‐A intervals will be similar at sites in the reentrant circuit, but will vary widely at sites with fibrillatory conduction, making these latter intervals unreliable indicators of AERP. Methods: During sustained AF due to a left atrial (LA) driver in 6 sterile pericarditis dogs, electrograms were recorded from 186 bipolar electrodes from both atria. A‐A intervals were measured from each recording site during 1.2 seconds of AF. Minimum A‐A intervals as well as temporal (within site) and spatial (between sites) variability were determined from all sites. Results: A‐A intervals from each site during AF demonstrated that (1) 90–100% of right atrial (RA) sites and 18–39% of LA sites showed considerable (SD > 6 ms) temporal variability; (2) RA and LA sites with fibrillatory conduction (SD > 6 ms) showed considerable (a) spatial variability (RA: 9–36 ms; LA: 5–27 ms) and (b) variability of the minimum A‐A intervals (RA: 14–35 ms; LA 11–28 ms). Conclusion: During AF due to a driver, areas with fibrillatory conduction manifested considerable variability in the mean and the minimum A‐A intervals. Therefore, it is unlikely that any of the A‐A intervals reflect AERP. (J Cardiovasc Electrophysiol, Vol. 22, pp. 310‐315, March 2011)