Metrological characterization of a combined bio-impedance plethysmograph and spectrometer

Pittella, Erika; Piuzzi, Emanuele; Rizzuto, Emanuele; Pisa, Stefano; Prete, Zaccaria Del

doi:10.1016/j.measurement.2018.02.032

Cited by 12 publications

(5 citation statements)

References 33 publications

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“…Together with the wide spectrum of sensing technologies above described for breath activity detection, a largely employed alternative is based on the measurement of bio-impedance, that allows gathering information on different vital parameters [39][40][41]. The principle of the impedance plethysmography is based on the recording of the trans-thoracic impedance, which changes proportionally to the volume of inspired air, through electrodes placed on the thoracic surface.…”

Section: Introductionmentioning

confidence: 99%

Wearable Belt With Built-In Textile Electrodes for Cardio—Respiratory Monitoring

Piuzzi

Pisa

Pittella

et al. 2020

Sensors

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Unobtrusive and continuous monitoring of vital signs is becoming more and more important both for patient monitoring in the home environment and for sports activity tracking. Even though many gadgets and clinical systems exist, the need for simple, low-cost and easily applicable solutions still remains, especially in view of a more widespread use within everyone’s reach. The paper presents a fully wearable and wireless sensorized belt, suitable to simultaneously acquire respiratory and cardiac signals employing a single acquisition channel. The adopted method relies on a 50-kHz current injected in the subject thorax through a couple of textile electrodes and on envelope detection of the trans-thoracic voltage acquired from a couple of different embedded electrodes. The resulting signal contains both the baseband electrocardiogram (ECG) signal and the trans-thoracic impedance signal, which encodes respiratory acts. The two signals can be easily separated through suitable filtering and the cardio–respiratory rates extracted. The proposed solution yields performances comparable to those of a spirometer and a two-lead ECG. The whole system, with a realization cost below 100 €, a wireless interface, and several hours (or even days) of autonomy, is a suitable candidate for everyday use, especially if complemented by motion artifact removal techniques, currently under implementation.

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Section: Introductionmentioning

confidence: 99%

Wearable Belt With Built-In Textile Electrodes for Cardio—Respiratory Monitoring

Piuzzi

Pisa

Pittella

et al. 2020

Sensors

Self Cite

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“…The identification of these disturbances is essential for the performances of the devices and to improve competitivity in the market. For this reason, the control unit and the accessories should be metrologically characterized through a specific test for each possible sources of error [18], [19]. Moreover, if the disturbances are properly identified, a corrective calibration strategy can be applied [20], [21].…”

Section: Measurement Uncertaintymentioning

confidence: 99%

Metrological characterization of instruments for body impedance analysis

et al. 2022

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<p>Body impedance analysis (BIA) is used to evaluate the human body composition by measuring the resistance and reactance of human tissues with a high-frequency, low-intensity electric current. Nonetheless, the estimation of the body composition is influenced by many factors: body status, environmental conditions, instrumentation, and measurement procedure. This work studies the effect of the connection cables, conductive electrodes, adhesive gel, and BIA device characteristics on the measurement uncertainty. Tests were initially performed on electric circuits with passive elements and on a jelly phantom simulating the body characteristics. Results showed that the cables mainly contribute to increase the error on the resistance measurement, while the electrodes and the adhesive introduce a negligible disturbance on the measurement chain. This paper also proposes a calibration procedure based on a multivariate linear regression to compensate for the systematic error effect of BIA devices.</p>

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“…In this way, a simple, non-invasive, and very sensitive volume measurement that could help identify high-risk HF patients is bioelectrical BI analysis. This measurement includes bioelectrical BI vector analysis performed with a single-frequency [33] device and/or multi-segment and multi-frequency [34] measurement equipment, which can be used to accurately measure intracellular and extracellular water components [35].…”

Section: Introductionmentioning

confidence: 99%

“…A comprehensive recent study showed that point measurement of BI in the leg is inversely associated with the incidence of HF in the general population [36]. Human body studies on acute HF diagnosis evaluated the BI of the whole body [27,35] or some parts, conducting the test called the segmented BI test: arms, legs, and intrathoracic [37][38][39] parts. These studies are based on the inverse relationship between body impedance and volume [27,40] which allows BI systems to estimate volumes or edemas by placing electrodes on the adequate [39] body part.…”

Section: Introductionmentioning

confidence: 99%

From Bioimpedance to Volume Estimation: A Model for Edema Calculus in Human Legs

et al. 2023

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Heart failure (HF) is a severe disease and one of the most important causes of death in our society nowadays. A significant percentage of patients hospitalized for decompensation of heart failure are readmitted after some weeks or months due to an expected bad and uncontrolled HF evolution due to the lack of the patient supervision in real time. Herein is presented a straightforward electric model useful for volume leg section calculus based on the bioimpedance test as a way to assist with the acute HF patient’s supervision. The method has been developed for time-evolution edema evaluation in patients’ corresponding legs. The data are picked up with a wearable device specifically developed for acute heart failure patients. As an initial step, a calibration method is proposed to extract the extracellular volume component from bioimpedance measurements done in healthy subjects, and then applied to unhealthy ones. The intra- and extracellular resistance components are calculated from fitted Cole–Cole model parameters derived from BI spectroscopy measurements. Results obtained in a pilot assay, with healthy subjects and heart failure subjects, show sensitivities in leg volume [mL/Ω], with much lower values for healthy than in unhealthy people, being an excellent biomarker to discriminate between both. Finally, circadian cycle evolution for leg volume has been measured from the bioimpedance test as an extension of the work, enabling an alternative parameter for the characterization of one day of human activity for any person.

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Metrological characterization of a combined bio-impedance plethysmograph and spectrometer

Cited by 12 publications

References 33 publications

Wearable Belt With Built-In Textile Electrodes for Cardio—Respiratory Monitoring

Wearable Belt With Built-In Textile Electrodes for Cardio—Respiratory Monitoring

Metrological characterization of instruments for body impedance analysis

From Bioimpedance to Volume Estimation: A Model for Edema Calculus in Human Legs

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