Evaluation of adjacent and opposite current injection patterns for a wearable chest electrical impedance tomography system

Yang, Lin; Gao, Zhijun; Wang, Chunchen; Wang, Hang; Dai, Jing; Liu, Yang; Qin, Yilong; Dai, Meng; Cao, Xinsheng; Zhao, Zhanqi

doi:10.1088/1361-6579/ad2215

Cited by 3 publications

(1 citation statement)

References 69 publications

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“…EIT measurements were conducted according to the manufacturer’s manual at the time of admission and before the discharge simultaneously when the FVC maneuver was conducted. The device and measurement setup details were previously published ( Yang et al, 2023a ; Yang et al, 2024 ). In brief, a belt with 16 equidistantly fixed electrodes was placed around the chest in one transverse plane at the level of the 5th intercostal space at the parasternal line, as shown in Figure 1 .…”

Section: Methodsmentioning

confidence: 99%

Electrical impedance tomography as a bedside assessment tool for COPD treatment during hospitalization

Yang,

Gao,

Cao

et al. 2024

Front. Physiol.

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For patients with chronic obstructive pulmonary disease (COPD), the assessment of the treatment efficacy during hospitalization is of importance to the optimization of clinical treatments. Conventional spirometry might not be sensitive enough to capture the regional lung function development. The study aimed to evaluate the feasibility of using electrical impedance tomography (EIT) as an objective bedside evaluation tool for the treatment of acute exacerbation of COPD (AECOPD). Consecutive patients who required hospitalization due to AECOPD were included prospectively. EIT measurements were conducted at the time of admission and before the discharge simultaneously when a forced vital capacity maneuver was conducted. EIT-based heterogeneity measures of regional lung function were calculated based on the impedance changes over time. Surveys for attending doctors and patients were designed to evaluate the ease of use, feasibility, and overall satisfaction level to understand the acceptability of EIT measurements. Patient-reported outcome assessments were conducted. User’s acceptance of EIT technology was investigated with a five-dimension survey. A total of 32 patients were included, and 8 patients were excluded due to the FVC maneuver not meeting the ATS criteria. Spirometry-based lung function was improved during hospitalization but not significantly different (FEV1 %pred.: 35.8% ± 6.7% vs. 45.3% ± 8.8% at admission vs. discharge; p = 0.11. FVC %pred.: 67.8% ± 0.4% vs. 82.6% ± 5.0%; p = 0.15. FEV1/FVC: 0.41 ± 0.09 vs. 0.42 ± 0.07, p = 0.71). The symptoms of COPD were significantly improved, but the correlations between the improvement of symptoms and spirometry FEV1 and FEV1/FVC were low (R = 0.1 and −0.01, respectively). The differences in blood gasses and blood tests were insignificant. All but one EIT-based regional lung function parameter were significantly improved after hospitalization. The results highly correlated with the patient-reported outcome assessment (R > 0.6, p < 0.001). The overall acceptability score of EIT measurement for both attending physicians and patients was high (4.1 ± 0.8 for physicians, 4.5 ± 0.5 for patients out of 5). These results demonstrated that it was feasible and acceptable to use EIT as an objective bedside evaluation tool for COPD treatment efficacy.

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Section: Methodsmentioning

confidence: 99%

Electrical impedance tomography as a bedside assessment tool for COPD treatment during hospitalization

Yang,

Gao,

Cao

et al. 2024

Front. Physiol.

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Progress in electrical impedance tomography and bioimpedance

Bayford,

Sadleir,

Frerichs

et al. 2024

Physiol. Meas.

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Title: Progress in Electrical Impedance Tomography and Bioimpedance Guest Editors • Prof. Richard Bayford. Department of Natural Science, Middlesex University, London, UK.• Prof. Rosalind Sadleir, School of Biological and Health Systems Engineering, Arizona State University, USA• Prof. Inéz Frerichs, Department of Anaesthesiology and Intensive Care Medicine, University Medical Centre Schleswig-Holstein, Campus Kiel, Kiel, Germany.• Prof. Tong In Oh, Department of Biomedical Engineering, Kyung Hee University, South Korea.• Prof. Steffen Leonhardt, Chair for Medical Information Technology, Helmholtz-Institute for Biomedical Engineering, RWTH Aachen University, Germany. ScopeThis focus collection aims at presenting recent advances in electrical impedance tomography (EIT), including algorithms, hardware, and clinical applications. Editorial This focus collection of articles published by the journal Physiological Measurement introduces the Progress in Electrical Impedance Tomography (EIT) and Bioimpedance. It follows conferences in South Korea and Germany, that provided a platform for new research ideas.

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Development and Validation of a Portable EIT System for Real-Time Respiratory Monitoring

Alvarado-Arriagada,

Fernández-Arroyo,

Rebolledo

et al. 2024

Sensors

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This work contributes to the improvement of novel medical technologies for the prevention and treatment of diseases. Electrical impedance tomography (EIT) has gained attention as a valuable tool for non-invasive monitoring providing real-time insights. The purpose of this work is to develop and validate a novel portable EIT system with a small form factor for respiratory monitoring. The device uses a 16-electrode architecture with adjacent stimulation and measurement patterns, an integrated circuit current source and a single high-speed ADC operating with multiplexers to stimulate and measure across all electrodes. Tests were conducted on 25 healthy subjects who performed a pulmonary function test with a flowmeter while using the EIT device. The results showed a good performance of the device, which was able to recognize all respirations correctly, and from the EIT signals and images, correlations of 96.7% were obtained for instantaneous respiratory rate and 96.1% for tidal volume prediction. These results validate the preliminary technical feasibility of the EIT system and demonstrates its potential as a reliable tool for non-invasive respiratory assessment. The significance of this work lies in its potential to democratize advanced respiratory monitoring technologies, making them accessible to a wider population, including those in remote or underserved areas.

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Evaluation of adjacent and opposite current injection patterns for a wearable chest electrical impedance tomography system

Cited by 3 publications

References 69 publications

Electrical impedance tomography as a bedside assessment tool for COPD treatment during hospitalization

Electrical impedance tomography as a bedside assessment tool for COPD treatment during hospitalization

Progress in electrical impedance tomography and bioimpedance

Development and Validation of a Portable EIT System for Real-Time Respiratory Monitoring

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