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Wavelength and Fibrosis Affect Phase Singularity Locations During Atrial Fibrillation

hal.structure.identifierIHU-LIRYC
dc.contributor.authorSAHA, Mirabeau
hal.structure.identifierKing‘s College London
dc.contributor.authorRONEY, Caroline
hal.structure.identifierModélisation et calculs pour l'électrophysiologie cardiaque [CARMEN]
dc.contributor.authorBAYER, Jason
hal.structure.identifierIHU-LIRYC
dc.contributor.authorMEO, Marianna
hal.structure.identifierIHU-LIRYC
dc.contributor.authorCOCHET, Hubert
hal.structure.identifierIHU-LIRYC
dc.contributor.authorDUBOIS, Rémi
hal.structure.identifierModélisation et calculs pour l'électrophysiologie cardiaque [CARMEN]
dc.contributor.authorVIGMOND, Edward
dc.date.accessioned2024-04-04T02:51:34Z
dc.date.available2024-04-04T02:51:34Z
dc.date.issued2018-09-10
dc.identifier.issn1664-042X
dc.identifier.urihttps://oskar-bordeaux.fr/handle/20.500.12278/191995
dc.description.abstractEnThe mechanisms underlying atrial fibrillation (AF), the most common sustained cardiac rhythm disturbance, remain elusive. Atrial fibrosis plays an important role in the development of AF and rotor dynamics. Both electrical wavelength (WL) and the degree of atrial fibrosis change as AF progresses. However, their combined effect on rotor core location remains unknown. The aim of this study was to analyze the effects of WL change on rotor core location in both fibrotic and non-fibrotic atria. Three patient specific fibrosis distributions (total fibrosis content: 16.6, 22.8, and 19.2%) obtained from clinical imaging data of persistent AF patients were incorporated in a bilayer atrial computational model. Fibrotic effects were modeled as myocyte-fibroblast coupling + conductivity remodeling; structural remodeling; ionic current changes + conductivity remodeling; and combinations of these methods. To change WL, action potential duration (APD) was varied from 120 to 240ms, representing the range of clinically observed AF cycle length, by modifying the inward rectifier potassium current (IK1) conductance between 80 and 140% of the original value. Phase singularities (PSs) were computed to identify rotor core locations. Our results show that IK1 conductance variation resulted in a decrease of APD and WL across the atria. For large WL in the absence of fibrosis, PSs anchored to regions with high APD gradient at the center of the left atrium (LA) anterior wall and near the junctions of the inferior pulmonary veins (PVs) with the LA. Decreasing the WL induced more PSs, whose distribution became less clustered. With fibrosis, PS locations depended on the fibrosis distribution and the fibrosis implementation method. The proportion of PSs in fibrotic areas and along the borders varied with both WL and fibrosis modeling method: for patient one, this was 4.2-14.9% as IK1 varied for the structural remodeling representation, but 12.3-88.4% using the combination of structural remodeling with myocyte-fibroblast coupling. The degree and distribution of fibrosis and the choice of implementation technique had a larger effect on PS locations than the WL variation. Thus, distinguishing the fibrotic mechanisms present in a patient is important for interpreting clinical fibrosis maps to create personalized models.
dc.description.sponsorshipStimulation de surface étendue à faible intensité (WAYLESS): une nouvelle thérapie pour terminer les arythmies cardiaques létales - ANR-16-CE19-0009
dc.language.isoen
dc.publisherFrontiers
dc.subject.enFibrosis
dc.subject.enphase singularity mapping
dc.subject.enrepolarization heterogeneity
dc.subject.encomputer simulation
dc.subject.enatrial fibrillation
dc.title.enWavelength and Fibrosis Affect Phase Singularity Locations During Atrial Fibrillation
dc.typeArticle de revue
dc.identifier.doi10.3389/fphys.2018.01207
dc.subject.halSciences du Vivant [q-bio]/Médecine humaine et pathologie/Cardiologie et système cardiovasculaire
bordeaux.journalFrontiers in Physiology
bordeaux.page1207
bordeaux.volume9
bordeaux.hal.laboratoriesInstitut de Mathématiques de Bordeaux (IMB) - UMR 5251*
bordeaux.institutionUniversité de Bordeaux
bordeaux.institutionBordeaux INP
bordeaux.institutionCNRS
bordeaux.peerReviewedoui
hal.identifierhal-02885634
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02885634v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Frontiers%20in%20Physiology&rft.date=2018-09-10&rft.volume=9&rft.spage=1207&rft.epage=1207&rft.eissn=1664-042X&rft.issn=1664-042X&rft.au=SAHA,%20Mirabeau&RONEY,%20Caroline&BAYER,%20Jason&MEO,%20Marianna&COCHET,%20Hubert&rft.genre=article


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