The role of photon scattering in optical signal distortion during arrhythmia and defibrillation.
Optical mapping of arrhythmias and defibrillation provides important insights; however, a limitation of the technique is signal distortion due to photon scattering. The goal of this experimental/simulation study is to investigate the role of three-dimensional photon scattering in optical signal dist...
| Main Authors: | , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
2007
|
| _version_ | 1826277182545068032 |
|---|---|
| author | Bishop, M Rodriguez, B Qu, F Efimov, I Gavaghan, D Trayanova, N |
| author_facet | Bishop, M Rodriguez, B Qu, F Efimov, I Gavaghan, D Trayanova, N |
| author_sort | Bishop, M |
| collection | OXFORD |
| description | Optical mapping of arrhythmias and defibrillation provides important insights; however, a limitation of the technique is signal distortion due to photon scattering. The goal of this experimental/simulation study is to investigate the role of three-dimensional photon scattering in optical signal distortion during ventricular tachycardia (VT) and defibrillation. A three-dimensional realistic bidomain rabbit ventricular model was combined with a model of photon transport. Shocks were applied via external electrodes to induce sustained VT, and transmembrane potentials (V(m)) were compared with synthesized optical signals (V(opt)). Fluorescent recordings were conducted in isolated rabbit hearts to validate simulation results. Results demonstrate that shock-induced membrane polarization magnitude is smaller in V(opt) and in experimental signals as compared to V(m). This is due to transduction of potentials from weakly polarized midmyocardium to the epicardium. During shock-induced reentry and in sustained VT, photon scattering, combined with complex wavefront dynamics, results in optical action potentials near a filament exhibiting i), elevated resting potential, ii), reduced amplitude relative to pacing, and iii), dual-humped morphologies. A shift of up to 4 mm in the phase singularity location was observed in V(opt) maps when compared to V(m). This combined experimental/simulation study provides an interpretation of optical recordings during VT and defibrillation. |
| first_indexed | 2024-03-06T23:25:03Z |
| format | Journal article |
| id | oxford-uuid:6a13eeda-b3e2-4517-adc8-d3e461910ca3 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T23:25:03Z |
| publishDate | 2007 |
| record_format | dspace |
| spelling | oxford-uuid:6a13eeda-b3e2-4517-adc8-d3e461910ca32022-03-26T18:55:07ZThe role of photon scattering in optical signal distortion during arrhythmia and defibrillation.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:6a13eeda-b3e2-4517-adc8-d3e461910ca3EnglishSymplectic Elements at Oxford2007Bishop, MRodriguez, BQu, FEfimov, IGavaghan, DTrayanova, NOptical mapping of arrhythmias and defibrillation provides important insights; however, a limitation of the technique is signal distortion due to photon scattering. The goal of this experimental/simulation study is to investigate the role of three-dimensional photon scattering in optical signal distortion during ventricular tachycardia (VT) and defibrillation. A three-dimensional realistic bidomain rabbit ventricular model was combined with a model of photon transport. Shocks were applied via external electrodes to induce sustained VT, and transmembrane potentials (V(m)) were compared with synthesized optical signals (V(opt)). Fluorescent recordings were conducted in isolated rabbit hearts to validate simulation results. Results demonstrate that shock-induced membrane polarization magnitude is smaller in V(opt) and in experimental signals as compared to V(m). This is due to transduction of potentials from weakly polarized midmyocardium to the epicardium. During shock-induced reentry and in sustained VT, photon scattering, combined with complex wavefront dynamics, results in optical action potentials near a filament exhibiting i), elevated resting potential, ii), reduced amplitude relative to pacing, and iii), dual-humped morphologies. A shift of up to 4 mm in the phase singularity location was observed in V(opt) maps when compared to V(m). This combined experimental/simulation study provides an interpretation of optical recordings during VT and defibrillation. |
| spellingShingle | Bishop, M Rodriguez, B Qu, F Efimov, I Gavaghan, D Trayanova, N The role of photon scattering in optical signal distortion during arrhythmia and defibrillation. |
| title | The role of photon scattering in optical signal distortion during arrhythmia and defibrillation. |
| title_full | The role of photon scattering in optical signal distortion during arrhythmia and defibrillation. |
| title_fullStr | The role of photon scattering in optical signal distortion during arrhythmia and defibrillation. |
| title_full_unstemmed | The role of photon scattering in optical signal distortion during arrhythmia and defibrillation. |
| title_short | The role of photon scattering in optical signal distortion during arrhythmia and defibrillation. |
| title_sort | role of photon scattering in optical signal distortion during arrhythmia and defibrillation |
| work_keys_str_mv | AT bishopm theroleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation AT rodriguezb theroleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation AT quf theroleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation AT efimovi theroleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation AT gavaghand theroleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation AT trayanovan theroleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation AT bishopm roleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation AT rodriguezb roleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation AT quf roleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation AT efimovi roleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation AT gavaghand roleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation AT trayanovan roleofphotonscatteringinopticalsignaldistortionduringarrhythmiaanddefibrillation |