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ABSTRACT: Background
Bipolar electrogram voltage during sinus rhythm (VSR) has been used as a surrogate for atrial fibrosis in guiding catheter ablation of persistent atrial fibrillation (AF), but the fixed rate and wavefront characteristics present during sinus rhythm may not accurately reflect underlying functional vulnerabilities responsible for AF maintenance.Objective
The purpose of this study was determine whether, given adequate temporal sampling, the spatial distribution of mean AF voltage (VmAF) better correlates with delayed-enhancement magnetic resonance imaging (MRI-DE)-detected atrial fibrosis than VSR.Methods
AF was mapped (8 seconds) during index ablation for persistent AF (20 patients) using a 20-pole catheter (660 ± 28 points/map). After cardioversion, VSR was mapped (557 ± 326 points/map). Electroanatomic and MRI-DE maps were co-registered in 14 patients.Results
The time course of VmAF was assessed from 1-40 AF cycles (?8 seconds) at 1113 locations. VmAF stabilized with sampling >4 seconds (mean voltage error 0.05 mV). Paired point analysis of VmAF from segments acquired 30 seconds apart (3667 sites; 15 patients) showed strong correlation (r = 0.95; P <.001). Delayed enhancement (DE) was assessed across the posterior left atrial (LA) wall, occupying 33% ± 13%. VmAF distributions were (median [IQR]) 0.21 [0.14-0.35] mV in DE vs 0.52 [0.34-0.77] mV in non-DE regions. VSR distributions were 1.34 [0.65-2.48] mV in DE vs 2.37 [1.27-3.97] mV in non-DE. VmAF threshold of 0.35 mV yielded sensitivity of 75% and specificity of 79% in detecting MRI-DE compared with 63% and 67%, respectively, for VSR (1.8-mV threshold). CONCLUSION: The correlation between low-voltage and posterior LA MRI-DE is significantly improved when acquired during AF vs sinus rhythm. With adequate sampling, mean AF voltage is a reproducible marker reflecting the functional response to the underlying persistent AF substrate.
SUBMITTER: Qureshi NA
PROVIDER: S-EPMC6722483 | biostudies-literature | 2019 Sep
REPOSITORIES: biostudies-literature
Qureshi Norman A NA Kim Steven J SJ Cantwell Chris D CD Afonso Valtino X VX Bai Wenjia W Ali Rheeda L RL Shun-Shin Matt J MJ Malcolme-Lawes Louisa C LC Luther Vishal V Leong Kevin M W KMW Lim Elaine E Wright Ian I Nagy Szabi S Hayat Sajad S Ng Fu Siong FS Wing Michael Koa MK Linton Nick W F NWF Lefroy David C DC Whinnett Zachary I ZI Davies D Wyn DW Kanagaratnam Prapa P Peters Nicholas S NS Lim Phang Boon PB
Heart rhythm 20190603 9
<h4>Background</h4>Bipolar electrogram voltage during sinus rhythm (V<sub>SR</sub>) has been used as a surrogate for atrial fibrosis in guiding catheter ablation of persistent atrial fibrillation (AF), but the fixed rate and wavefront characteristics present during sinus rhythm may not accurately reflect underlying functional vulnerabilities responsible for AF maintenance.<h4>Objective</h4>The purpose of this study was determine whether, given adequate temporal sampling, the spatial distribution ...[more]