Removing Respiratory Artefacts from Transthoracic Bioimpedance Spectroscopy Measurements

Publication Type Journal Article
Authors Illapha Cuba Gyllensten, F. Abtahi, Alberto Bonomi, Kaj Lindecrantz, Fernando Seoane, Oliver Amft
Title Removing Respiratory Artefacts from Transthoracic Bioimpedance Spectroscopy Measurements
Abstract Transthoracic impedance spectroscopy (TIS) measurements from wearable textile electrodes provide a tool to remotely and non-invasively monitor patient health. However, breathing and cardiac processes inevitably affect TIS measurements, since they are sensitive to changes in geometry and air or fluid volumes in the thorax. This study aimed at investigating the effect of respiration on Cole parameters extracted from TIS measurements and developing a method to suppress artifacts. TIS data were collected from 10 participants at 16 frequencies (range: 10 kHz ? 1 MHz) using a textile electrode system (Philips Technologie Gmbh). Simultaneously, breathing volumes and frequency were logged using an electronic spirometer augmented with data from a breathing belt. The effect of respiration on TIS measurements was studied at paced (10 and 16 bpm) deep and shallow breathing. These measurements were repeated for each subject in three different postures (lying down, reclining and sitting). Cole parameter estimation was improved by assessing the tidal expiration point thus removing breathing artifacts. This leads to lower intra-subject variability between sessions and a need for less measurements points to accurately assess the spectra. Future work should explore algorithmic artifacts compensation models using breathing and posture or patient contextual information to improve ambulatory transthoracic impedance measurements.
Publication Journal of Physics: Conference Series (J. Phys.: Conf. Ser.)
Volume 434
Date 2013
DOI 10.1088/1742-6596/434/1/012018
Extra ICEBI 2013: Proceedings of the International Conference on Electrical Bio-Impedance
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Friedrich-Alexander-Universität Erlangen-Nürnberg