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• W2081888511 abstract "Optical mapping with voltage-sensitive dyes provides a high-resolution technique to observe cardiac electrodynamic behavior. Although most studies assume that the fluorescent signal is emitted from the surface layer of cells, the effects of signal attenuation with depth on signal interpretation are still unclear. This simulation study examines the effects of a depth-weighted signal on epicardial activation patterns and filament localization. We simulated filament behavior using a detailed cardiac model, and compared the signal obtained from the top (epicardial) layer of the spatial domain with the calculated weighted signal. General observations included a prolongation of the action upstroke duration, early upstroke initiation, and reduction in signal amplitude in the weighted signal. A shallow filament was found to produce a dual-humped action potential morphology consistent with previously reported observations. Simulated scroll wave breakup exhibited effects such as the false appearance of graded potentials, apparent supramaximal conduction velocities, and a spatially blurred signal with the local amplitude dependent upon the immediate subepicardial activity; the combination of these effects produced a corresponding change in the accuracy of filament localization. Our results indicate that the depth-dependent optical signal has significant consequences on the interpretation of epicardial activation dynamics." @default.
• W2081888511 created "2016-06-24" @default.
• W2081888511 creator A5027130614 @default.
• W2081888511 creator A5059820642 @default.
• W2081888511 date "2003-12-01" @default.
• W2081888511 modified "2023-10-18" @default.
• W2081888511 title "Examination of Optical Depth Effects on Fluorescence Imaging of Cardiac Propagation" @default.
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• W2081888511 doi "https://doi.org/10.1016/s0006-3495(03)74825-5" @default.
• W2081888511 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1303712" @default.
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• W2081888511 hasPublicationYear "2003" @default.
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