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Electrode positioning to investigate the changes of the thoracic bioimpedance caused by aortic dissection – a simulation study

Journal of Electrical Bioimpedance
Volume 11 (2020): Issue 1 (January 2020)
By:
Open Access
|Jun 2020

Figures & Tables

Fig. 1

a) Intimal tear in the aorta [2]. b) Aortic dissection types (Stanford system) [3].
a) Intimal tear in the aorta [2]. b) Aortic dissection types (Stanford system) [3].

Fig. 2

The spatial average time-dependent cross-sectional radius of the aortic arch and the descending aorta during one cardiac cycle.
The spatial average time-dependent cross-sectional radius of the aortic arch and the descending aorta during one cardiac cycle.

Fig. 3

The spatial average time-dependent blood velocity in the aortic arch and the descending aorta.
The spatial average time-dependent blood velocity in the aortic arch and the descending aorta.

Fig. 4

Orientation and deformation of RBCs in a blood vessel during the systole and diastole.
Orientation and deformation of RBCs in a blood vessel during the systole and diastole.

Fig. 5

The blood conductivity changes as a function of reduced average velocity 〈v/R〉 for different haematocrit (H) levels.
The blood conductivity changes as a function of reduced average velocity 〈v/R〉 for different haematocrit (H) levels.

Fig. 6

Simulation model setup. a) 3D view – b) 2D bottom view.
Simulation model setup. a) 3D view – b) 2D bottom view.

Fig. 7

Flow disturbances around the dissection in case of an aortic dissection.
Flow disturbances around the dissection in case of an aortic dissection.

Fig. 8

Damage factor DF as a function of the radius of the false lumen.
Damage factor DF as a function of the radius of the false lumen.

Fig. 9

Source electrode pairs and measurement electrode pairs positions.
Source electrode pairs and measurement electrode pairs positions.

Fig. 10

Values of Y^n,mPCE(t) \widehat Y_{n,m}^{PCE}(t) reflecting the discrepancy between the healthy and dissected conditions for 20-time steps and all proposed electrode combinations.
Values of Y^n,mPCE(t) \widehat Y_{n,m}^{PCE}(t) reflecting the discrepancy between the healthy and dissected conditions for 20-time steps and all proposed electrode combinations.

Fig. 11

Maximal discrepancy Y^maxPCE \widehat Y_{max}^{PCE} for the fourth time step and each electrode configuration. Colours show source electrodes; blue: injection from A, red: injection from B, yellow: injection from C; numbers show the measurement electrodes.
Maximal discrepancy Y^maxPCE \widehat Y_{max}^{PCE} for the fourth time step and each electrode configuration. Colours show source electrodes; blue: injection from A, red: injection from B, yellow: injection from C; numbers show the measurement electrodes.

Fig. 12

Sensitivity analysis on a. HC^C,4PCE(t) \widehat {HC}_{C,4}^{PCE}(t) , b. DC^C,4PCE(t) \widehat {DC}_{C,4}^{PCE}(t) , c. Y^C,4PCE(t) \widehat Y_{C,4}^{PCE}(t) .
Sensitivity analysis on a. HC^C,4PCE(t) \widehat {HC}_{C,4}^{PCE}(t) , b. DC^C,4PCE(t) \widehat {DC}_{C,4}^{PCE}(t) , c. Y^C,4PCE(t) \widehat Y_{C,4}^{PCE}(t) .

Fig. 13

Changing of Y^maxPCE \widehat Y_{max}^{PCE} by the damage factor for injection from source electrodes C (inj C) and measurement from five electrode pairs (m1 to m5).
Changing of Y^maxPCE \widehat Y_{max}^{PCE} by the damage factor for injection from source electrodes C (inj C) and measurement from five electrode pairs (m1 to m5).

Fig. 14

a. HC^C,4PCE(t) \widehat {HC}_{C,4}^{PCE}(t) and DC^C,4PCE(t) \widehat {DC}_{C,4}^{PCE}(t) for different damage factors, b. Y^C,4PCE(t) \widehat Y_{C,4}^{PCE}(t) for different damage factors.
a. HC^C,4PCE(t) \widehat {HC}_{C,4}^{PCE}(t) and DC^C,4PCE(t) \widehat {DC}_{C,4}^{PCE}(t) for different damage factors, b. Y^C,4PCE(t) \widehat Y_{C,4}^{PCE}(t) for different damage factors.

Input space description for the healthy and dissected study cases_

CasesVariableDistributionMomentsUnit
HealthyRTLUniform[1.35 1.95]cm
θHUniform[1.0 1.1]-
DissectedRTLUniform[1.35 1.95]cm
θHUniform[1.0 1.1]-
RTLUniform[0.3 1.5]cm
αFLUniform[2.9 3.65]rad
DOI: https://doi.org/10.2478/joeb-2020-0007 | Journal eISSN: 1891-5469
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Language: English
Page range: 38 - 48
Submitted on: Mar 16, 2020
Published on: Jun 25, 2020
Published by: University of Oslo
In partnership with: Paradigm Publishing Services
Publication frequency: 1 issue per year
Keywords:
Aortic dissection,
impedance cardiography,
numerical simulation,
sensitivity analysis
Related subjects:
Engineering,
Bioengineering and biomedical engineering,
Biomedical electronics,
Life sciences,
Biophysics,
Medicine,
Biomedical engineering,
Physics,
Spectroscopy and metrology

© 2020 V. Badeli, G. M. Melito, A. Reinbacher-Köstinger, O. Bíró, K. Ellermann, published by University of Oslo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

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