Novel electrode configuration for highly linear impedance pneumography

Seppä, Ville-Pekka; Hyttinen, Jari; Uitto, Marko; Chrapek, Wojciech; Viik, Jari

doi:10.1515/bmt-2012-0068

Cited by 42 publications

(42 citation statements)

References 14 publications

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“…The overnight signals were acquired using custom-designed recording devices (design of Tampere University of Technology, Finland). The four skin electrodes were placed bilaterally on the thorax and arms close to the armpit yielding high linearity between impedance and lung volume (figure 1) [15]. Parents kept a diary of sleeping time, eventual symptoms and medication at home.…”

Section: Impedance Pneumography Measurementmentioning

confidence: 99%

“…The underlying phenomenon has been known for almost a decade, but its main clinical use has been to monitor respiratory rate in intensive care settings. However, recent technical advancements in impedance pneumography signal processing [14] and electrode placement [15] have enabled impedance pneumography to be used for accurate noninvasive respiratory flow signal measurement. It is the only ambulatory, noninvasive method that has shown high flow signal agreement with direct pneumotachography, enabling tidal flow-volume curve assessment in young children even during induced airway obstruction [16].…”

Section: Introductionmentioning

confidence: 99%

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Tidal flow variability measured by impedance pneumography relates to childhood asthma risk

et al. 2016

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Lung function variability is a fundamental feature of asthma but has been difficult to quantify in children due to methodological limitations. We assessed the feasibility and clinical implications of overnight flow variability measurement at home using impedance pneumography in young children.44 children aged 3-7 years with recurrent or persistent lower airway symptoms were recruited. Patients were divided into high- or lower-risk groups (HR and LR groups) based on their risk of asthma (modified Asthma Predictive Index), and a third group was formed of children who had a history of wheeze and who were treated with inhaled corticosteroids (ICS group). Tidal volume and the derived flow were recorded through skin electrodes using impedance pneumography at home during sleep. Quantities describing overnight change in expiratory flow-volume minimum curve shape correlation (CSRmin) and respiratory chaoticity (minimum noise limit (NLmin)) were derived.Recordings were successful in 34 children. CSRmin differed between the HR and LR groups (p=0.002) and between the HR and ICS groups (p=0.003), indicating a stronger change in flow profile shape in the HR group. NLmin differed between the HR and LR groups (p=0.014), indicating momentarily lowered chaoticity in the HR group.Impedance pneumography was found feasible for quantifying nocturnal lung function variability and the measured variability was associated with risk of asthma in young children.

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Section: Impedance Pneumography Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tidal flow variability measured by impedance pneumography relates to childhood asthma risk

et al. 2016

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“…Over the past decades there have been several attempts to use impedance for regional or whole-lung tidal volume measurements [9,10], but thus far only respiratory rate measurement in intensive care settings has gained wider clinical acceptance. However, recent technical advancements in IP signal processing [11] and electrode placement [12] have enabled IP to be used for noninvasive estimation of tidal airflow profiles. High agreement has been demonstrated in relative flow signal and TBFV indices between IP and direct PNT in young children, even during induced bronchoconstriction [13].…”

Section: Introductionmentioning

confidence: 99%

Measurement of tidal breathing flows in infants using impedance pneumography

et al. 2016

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Tidal breathing flow volume (TBFV) profiles have been used to characterise altered lung function. Impedance pneumography (IP) is a novel option for assessing TBFV curves noninvasively. The aim of this study was to extend the application of IP for infants and to estimate the agreement between IP and direct pneumotachograph (PNT) measurements in assessing tidal airflow and flow-derived indices.Tidal flow profiles were recorded for 1 min simultaneously with PNT and uncalibrated IP at baseline in 44 symptomatic infants, and after methacholine-induced bronchoconstriction in a subgroup (n=20).The agreement expressed as the mean deviation from linearity ranged between 3.9 and 4.3% of tidal peak inspiratory flow, but was associated with specific airway conductance (p=0.002) and maximal flow at functional residual capacity () (p=0.004) at baseline. Acute bronchoconstriction induced by methacholine did not significantly affect the agreement of IP with PNT. TBFV indices derived from IP were slightly underestimated compared to PNT, but were equally well repeatable and associated with baseline (p=0.012 and p=0.013, respectively).TBFV profiles were consistent between IP and PNT in most infants, but the agreement was affected by reduced lung function. TBFV parameters were not interchangeable between IP and PNT, but had a similar association with lung function in infants.

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“…All the results indicate that the IP signal acquired from configuration D using four-electrode method well represents the IPNT signal and is least affected by noise. The robust configuration is different from the configurations of some studies due to different experimental protocols and evaluation parameters [29][30][31]. In this study, the robust electrode configuration is tested in a more comprehensive way, which not only adopts the absolute and relative evaluation parameters, but also confirms the performance in various respiratory patterns and body postures.…”

Section: Electrode Configurationmentioning

confidence: 93%

A Robust Electrode Configuration for Bioimpedance Measurement of Respiration

Wang¹,

Yen²,

Liang³

et al. 2014

Journal of Healthcare Engineering

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Electrode configuration is an important issue in the continuous measurement of respiration using impedance pneumography (IP). The robust configuration is usually confirmed by comparing the amplitude of the IP signals acquired with different electrode configurations, while the relative change in waveform and the effects of body posture and respiratory pattern are ignored. In this study, the IP signals and respiratory volume are simultaneously acquired from 8 healthy subjects in supine, left lying, right lying and prone postures, and the subjects are asked to perform four respiratory patterns including free breathing, thoracic breathing, abdominal breathing and apnea. The IP signals are acquired with four different chest electrode configurations, and the volume are measured using pneumotachograph (PNT). Differences in correlation and absolute deviation between the IP-derived and PNT-derived respiratory volume are assessed. The influences of noise, respiratory pattern and body posture on the IP signals of different configurations have significant difference (p < 0.05). The robust electrode configuration is found on the axillary midline, which is suitable for long term respiration monitoring.

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Novel electrode configuration for highly linear impedance pneumography

Cited by 42 publications

References 14 publications

Tidal flow variability measured by impedance pneumography relates to childhood asthma risk

Tidal flow variability measured by impedance pneumography relates to childhood asthma risk

Measurement of tidal breathing flows in infants using impedance pneumography

A Robust Electrode Configuration for Bioimpedance Measurement of Respiration

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