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    Left atrial wall stress distribution and its relationship to electrophysiologic remodeling in persistent atrial fibrillation

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    Authors
    Hunter, R. J.
    Liu, Yankai
    Lu, Yiling
    Wang, Wen
    Schilling, R. J.
    Affiliation
    University of Derby
    Issue Date
    2012-01
    
    Metadata
    Show full item record
    Abstract
    Background—Atrial stretch causes remodeling that predisposes to atrial fibrillation. We tested the hypothesis that peaks in left atrial (LA) wall stress are associated with focal remodeling. Methods and Results—Nineteen patients underwent LA mapping before catheter ablation for persistent atrial fibrillation. Finite Element Analysis was used to predict wall stress distribution based on LA geometry from CT. The relationship was assessed between wall stress and (1) electrogram voltage and (2) complex fractionated atrial electrograms (CFAE), using CFAE mean (the mean interval between deflections). Wall stress varied widely within atria and between subjects (median, 36 kPa; interquartile range, 26–51 kP). Peaks in wall stress (≥90th percentile) were common at the pulmonary vein (PV) ostia (93%), the appendage ridge (100%), the high posterior wall (84%), and the anterior wall and septal regions (42–84%). Electrogram voltage showed an inverse relationship across quartiles for wall stress (19% difference across quartiles, P=0.016). There was no effect on CFAE mean across quartiles of wall stress. Receiver operating characteristic analysis showed high wall stress was associated with low voltage (ie, <0.5 mV) and electrical scar (ie, <0.05 mV; both P<0.0001) and with absence of CFAE (ie, CFAE mean <120 ms; P<0.0001). However, peaks in wall stress and CFAE were found at 88% of PV ostia. Conclusions—Peaks in wall stress were associated with areas of low voltage, suggestive of focal remodeling. Although peaks in wall stress were not associated with LA CFAE, the PV ostia may respond differently.
    Citation
    Left atrial wall stress distribution and its relationship to electrophysiologic remodeling in persistent atrial fibrillation 2012, 5 (2):351 Circulation: Arrhythmia and Electrophysiology
    Journal
    Circulation: Arrhythmia and Electrophysiology
    URI
    http://hdl.handle.net/10545/313858
    DOI
    10.1161/CIRCEP.111.965541
    Additional Links
    http://circep.ahajournals.org/content/5/2/351
    Type
    Article
    Language
    en
    ISSN
    1941-3149
    1941-3084
    ae974a485f413a2113503eed53cd6c53
    10.1161/CIRCEP.111.965541
    Scopus Count
    Collections
    Department of Mechanical Engineering & the Built Environment

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