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Textrode-enabled transthoracic electrical bioimpedance measurements: towards wearable applications of impedance cardiography
KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS) (Closed 20130701). University of Borås, Sweden.
University of Borås, Sweden.
KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS) (Closed 20130701). University of Borås, Sweden.ORCID iD: 0000-0002-6995-967X
KTH, School of Technology and Health (STH), Medical sensors, signals and systems (MSSS) (Closed 20130701). Karolinska Institutet, Sweden.
2013 (English)In: Journal of Electrical Bioimpedance, ISSN 1891-5469, E-ISSN 1891-5469, Vol. 4, 45-50 p.Article in journal, Editorial material (Refereed) Published
Abstract [en]

During the last decades the use of Electrical Bioimpedance (EBI) in the medical field has been subject of extensive research, especially since it is an affordable, harmless and non-invasive technology.

In some specific applications such as body composition assessment where EBI has proven a good degree of effectiveness and reliability, the use of textile electrodes and measurement garments have shown a good performance and reproducible results.

Impedance Cardiography (ICG) is another modality of EBI that can benefit from the implementation and use of wearable sensors. ICG technique is based on continuous impedance measurements of a longitudinal segment across the thorax taken at a single frequency. The need for specific electrode placement on the thorax and neck can be easily ensured with the use of a garment with embedded textile electrodes, textrodes. The first step towards the implementation of ICG technology into a garment is to find out if ICG measurements with textile sensors give a good enough quality of the signal to allow the estimation of the fundamental ICG parameters.

In this work, the measurement performance of a 2-belt set with incorporated textrodes for thorax and neck was compared against ICG measurements obtained with Ag/AgCl electrodes. The analysis was based on the quality of the fundamental ICG signals (∆Z, dZ/dt and ECG), systolic time intervals and other ICG parameters. The obtained results indicate the feasibility of using textrodes for ICG measurements with consistent measurements and relatively low data dispersion. Thus, enabling the development of measuring garments for ICG measurements.

Place, publisher, year, edition, pages
2013. Vol. 4, 45-50 p.
Keyword [en]
ICG, Impedance Cardiography, Bioimpedance, textrodes, textile electrodes
National Category
Medical Materials Medical Materials
URN: urn:nbn:se:kth:diva-107489DOI: 10.5617/jeb.542OAI: diva2:576274

QC 20141118. Updated from submitted to published.

Available from: 2012-12-12 Created: 2012-12-12 Last updated: 2015-12-07Bibliographically approved
In thesis
1. Sensor-Based Garments that Enable the Use of Bioimpedance Technology: Towards PersonalizedHealthcare Monitoring.
Open this publication in new window or tab >>Sensor-Based Garments that Enable the Use of Bioimpedance Technology: Towards PersonalizedHealthcare Monitoring.
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Functional garments for physiological sensing purposes have been utilized in several disciplinesi.e. sports, firefighting, military and medical. In most of the cases textile electrodes (Textrodes)embedded in the garment are employed to monitor vital signs and other physiologicalmeasurements. Electrical Bioimpedance (EBI) is a non-invasive and effective technology that canbe used for detection and supervision of different health conditions. In some specific applicationssuch as body composition assessment EBIS has shown encouraging results proving good degreeof effectiveness and reliability. In a similar way Impedance Cardiography (ICG) is anothermodality of EBI primarily concerned with the determination of Stroke Volume SV, indices ofcontractility, and other aspects of hemodynamics.EBI technology in the previously mentioned modalities can benefit from a integration with agarment; however, a successful implementation of EBI technology depends on the goodperformance of textile electrodes. The main weakness of Textrodes is a deficient skin-electrodeinterface which produces a high degree of sensitivity to signal disturbances. This sensitivity canbe reduced with a suitable selection of the electrode material and an intelligent and ergonomicgarment design that ensures an effective skin-electrode contact area.This research work studies the performance of textile electrodes and garments for EBIspectroscopy for Total Body Assessment and Transthoracic Electrical Bioimpedance (TEB) forcardio monitoring. Their performance is analyzed based on impedance spectra, estimation ofparameters, influence of electrode polarization impedance Zep and quality of the signals using asreference Ag/AgCl electrodes. The study includes the analysis of some characteristics of thetextile electrodes such as conductive material, skin-electrode contact area size and fabricconstruction.The results obtained in this research work present evidence that textile garments with a dry skinelectrodeinterface like the ones used in research produce reliable EBI measurements in bothmodalities: BIS for Total Body Assessment and TEB for Impedance Cardiography. Textiletechnology, if successfully integrated, may enable the utilization of EBI in both modalities andconsequently implementing wearable applications for home and personal health monitoring.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2013. x, 70 p.
TRITA-STH : report, ISSN 1653-3836 ; 2012:6
Bioimpedance, textrodes, textile electrodes, Impedance Cardiography, Body Composition
National Category
Medical Materials Medical Equipment Engineering
urn:nbn:se:kth:diva-107493 (URN)978-91-7501-603-0 (ISBN)
Public defence
2013-01-16, 3-221, Alfred Nobels Allé 10, Flemingsberg, 14:40 (English)

QC 20121213

Available from: 2012-12-13 Created: 2012-12-12 Last updated: 2016-02-04Bibliographically approved

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Marquez Ruiz, Juan CarlosSeoane, FernandoLindecrantz, Kaj
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