A portable bio-impedance system for monitoring lung resistivity

Zlochiver, Sharon; Arad, Marina; Radai, Michal M.; Barak-Shinar, Deganit; Krief, Haim; Engelman, Tzvika; Ben-Yehuda, Rotem; Adunsky, Abraham; Abboud, Shimon

doi:10.1016/j.medengphy.2006.02.005

Cited by 56 publications

(43 citation statements)

References 28 publications

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“…If conductivity is more resistance or bio impedance is less leading to less voltage drop. If conductivity is less resistance is high leading to large voltage drop [11,12].…”

Section: Methodsmentioning

confidence: 99%

Impact of Upper Limb Joint Fluid Variation on Inflammatory Diseases Diagnosis

G¹,

Natarajan²,

Nanda³

2014

Journal of Electrical Engineering and Technology

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-Joint pain is generally a common disorder not only for the old aged people but also for the immunocompromised patients. The present proposed study reveals the presence of inflammatory diseases in joint generally diagnosed by removing synovial fluid and changes in the volume and composition are examined for the presence of WBC and crystals. This study implement a non-invasive approach to identify the changes in joint fluid by measuring the changes in electrical property of the synovial tissue under the influence of electrical current signal with frequency range between 100 kHz to 300 kHz. The response of tissue for the current signal was measured in terms of potential drop across the tissue. The hardware system design consists of input and output sections. The input section which applies current signal to upper limb joint region is made of ICL8038 function generator IC with amplifier and voltage to current converter. The output section picks voltage variation using metal surface electrode, amplifier, ADC, PIC microcontroller and LCD interface. 100 patient inclusive of normal and disease affected patients where examined for upper limb synovial fluid variation and inflammatory diseases were identified.

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“…If conductivity is more resistance or bio impedance is less leading to less voltage drop. If conductivity is less resistance is high leading to large voltage drop [11,12].…”

Section: Methodsmentioning

confidence: 99%

Impact of Upper Limb Joint Fluid Variation on Inflammatory Diseases Diagnosis

G¹,

Natarajan²,

Nanda³

2014

Journal of Electrical Engineering and Technology

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“…By using 4 electrodes and parametric reconstruction, rather than full resistivity distribution reconstruction, this approach is expected to be much less sensitive to measurement noise than conventional EIT systems yet capable of measuring specific lungs’ electrical properties, which the whole‐thoracic measurement cannot. The system reproducibility and ability to separate healthy from edemic patients were previously demonstrated in our works 30–33 . Briefly, reproducibility was demonstrated to be better than 2% for both within and between measurements, and the system’s measurement performance was validated by comparison with urine output in patients undergoing intravenous diuretics treatment (correlation coefficient, R =0.73; P =.004).…”

mentioning

confidence: 85%

A Novel Telemedicine System for Monitoring Congestive Heart Failure Patients

Radai¹,

Arad²,

Zlochiver³

et al. 2008

Congestive Heart Failure

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Congestive heart failure is a widespread cardiac disease in western countries. At present, the main measure for monitoring the level of pulmonary edema in telemedicine systems is weight, which is not a reliable indicator. The authors propose a novel bioimpedance telemedical system to monitor these patients. The system measures the resistivity of each lung using optimization methods and transmits the measurements via a modem to a call center. Preliminary results show that the measured resistivity values among healthy young patients are consistent and reproducible within 48 hours. The mean resistivity values in patients with pulmonary congestion were lower than those of the healthy patients: 887 [Ω*cm]±117 vs 1244 [Ω*cm]±87 (P<.01). The system is noninvasive, safe, and portable. It retrieves unique information correlated with the amount of fluid in the lungs and transmits the data to a medical call center in order to improve the diagnostics and treatment of congestive heart failure.

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“…Zlochiver S et al presented a hybrid bio-impedance approach combing the transthoracic impedance measurement and EIT for monitoring the left and the right lung resistivity [27]. They found that the specific resistance of two lungs has good symmetry in a healthy population.…”

Section: A the Coordination Between The Left And Right Lungmentioning

confidence: 99%

A Principal Component Analysis Based Data Fusion Method for Estimation of Respiratory Volume

et al. 2015

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Impedance plethysmography (IP) is widely used in pulmonary volume measurement in recent years. Previous researches mainly focused on improving respiratory volume measurement accuracy by improving filter performance, electrode configuration, and so on, ignoring the influence of sleep posture changes. To solve this problem, we presented a principal component analysis (PCA)-based data fusion algorithm to minimize the effects of sleep posture changes on pulmonary volume measurement using a new dual-channel IP system. In situ experiments with ten subjects indicated that the PCA-based data fusion method improved the performance with the mean absolute error decreased ∼25%. Thus, the novel method potentially achieves a higher sensitivity of the sleep respiratory function diagnosis.Index Terms-Pulmonary volume, impedance plethysmography (IP), principal component analysis (PCA), sleep posture changes.

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A portable bio-impedance system for monitoring lung resistivity

Cited by 56 publications

References 28 publications

Impact of Upper Limb Joint Fluid Variation on Inflammatory Diseases Diagnosis

Impact of Upper Limb Joint Fluid Variation on Inflammatory Diseases Diagnosis

A Novel Telemedicine System for Monitoring Congestive Heart Failure Patients

A Principal Component Analysis Based Data Fusion Method for Estimation of Respiratory Volume

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