Abstract
Background: The regional distribution of the low-voltage zones (LVZs) may relate to the maintenance of atrial arrhythmias in the right atrium (RA). Objectives: The purpose of this study was to investigate the RA substrate characteristics in different types of atrial arrhythmias originating from RA and left atrium (LA). Methods: Forty-five patients (35 men, age = 62 ± 15 years) with RA atypical atrial flutter (n = 15, group 1), RA atrial fibrillation (AF; n = 15, no PV initiating foci, group 2), and LA AF (n = 1 5, no RA arrhythmias, group 3) referred for three-dimensional EnSite mapping were included. Voltage and activation maps were visualized. Results: The mean voltage of the RA was lower in group 2, and compared with group 3, a voltage reduction during atrial pacing was evident in groups 1 and 2. The fixed LVZs (independent of the rhythm) were mostly located along the lower crista terminalis (CT). A functional extension of the LVZ was located on the CT in 84% of patients, sinus venosa in 18%, and free-wall region in 27%, forming the borders of the slow conduction isthmus for the reentrant circuits. The number of slow conduction isthmuses was 1.3 ± 0.9, 2.2 ± 1.0, and 0.87 ± 0.74, for the groups 1-3 patients, respectively (P
Original language | English |
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Pages (from-to) | 592-598 |
Number of pages | 7 |
Journal | Heart Rhythm |
Volume | 6 |
Issue number | 5 |
DOIs | |
Publication status | Published - May 2009 |
Keywords
- Ablation
- Atrial fibrillation
- Atrial flutter
- Electrogram
- Voltage
ASJC Scopus subject areas
- Cardiology and Cardiovascular Medicine
- Physiology (medical)