Measurements of PEEP-Induced Changes in Lung Volume

Uhlig, Torsten; Kondo, Tsutomu; Sly, Peter D.

doi:10.1378/chest.112.1.107

Cited by 8 publications

(7 citation statements)

References 20 publications

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“…The laser equipment has been previously described and validated in adults. 5,6 Briefly the system consists of five laser sensors, amplifier, control unit, and computer software ( Fig. 1).…”

Section: Equipmentmentioning

confidence: 99%

“…In a much simpler setup, using a single laser sensor, we have previously demonstrated a good correlation between tidal volume and amplitude of the abdomen during tidal breathing in healthy adults. 5,6 Infants, however may demonstrate more asynchrony of thoracic and abdominal movements with more complicated motion in axial (cranio-caudal), horizontal (latero-lateral), and anteroposterior (dorso-ventral) directions. 4 The aim of this study was to develop a monitoring system using five laser position sensors to observe local movements of the chest wall at right and left upper and lower thoracic and at midline abdominal positions.…”

Section: Introductionmentioning

confidence: 99%

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Noninvasive monitoring of chest wall movement in infants using laser

Kondo

Minocchieri

Baldwin

et al. 2006

Pediatric Pulmonology

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Traditionally, non-invasive monitoring of tidal volume in infants has been performed using impedance plethysmography analyzed using a one or two compartment model. We developed a new laser system for use in infants, which measures antero-posterior movement of the chest wall during quiet sleep. In 24 unsedated or sedated infants (11 healthy, 13 with respiratory disease), we examined whether the analysis of thoracoabdominal movement based on a three compartment model could more accurately estimate tidal volume in comparison to V(T) measured at the mouth. Using five laser signals, chest wall movements were measured at the right and left, upper and lower ribcage and the abdomen. Within the tidal volume range from 4.6 to 135.7 ml, a three compartment model showed good short term repeatability and the best agreement with tidal volume measured at mouth (r(2) = 0.86) compared to that of a single compartment model (r(2) = 0.62, P < 0.0001) and a two compartment model (r(2) = 0.82, P < 0.01), particularly in the presence of respiratory disease. Three compartment modeling of a 5 laser thoracoabdominal monitoring permits more accurate estimates of tidal volume in infants and potentially of regional differences of chest wall displacement in future studies.

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“…The laser equipment has been previously described and validated in adults. 5,6 Briefly the system consists of five laser sensors, amplifier, control unit, and computer software ( Fig. 1).…”

Section: Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Noninvasive monitoring of chest wall movement in infants using laser

Kondo

Minocchieri

Baldwin

et al. 2006

Pediatric Pulmonology

Self Cite

View full text Add to dashboard Cite

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“…For this reason, a number of sensors suitable for respiration pattern monitoring during sleep have been reported. Some of these sensors require skin contact (e.g., systems that utilize electrodes like impedance plethysmography), while others are based on calibrated displacement sensors or inductive sensors that are embedded in tightly fitted jackets/garments (e.g., inductive plethysmography and strain-gauge plethysmography) [3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

A Wearable Contactless Sensor Suitable for Continuous Simultaneous Monitoring of Respiration and Cardiac Activity

et al. 2015

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A reliable system that can simultaneously and accurately monitor respiration and cardiac output would have great utility in healthcare applications. In this paper we present a novel approach to creating such a system. This noninvasive, low power, low cost, contactless sensor is suitable for continuous monitoring of respiration (tidal volume) and cardiac stroke volume. Furthermore, it is capable of delivering this data in true volume (i.e., mL). The current embodiment, specifically designed for sleep monitoring applications, requires only 100 mW when powered by a 4.8 V battery pack and is based on the use of a single electroresistive band embedded in a T-shirt. Here, we describe the implementation of the device, explaining the rational and design choices for the electronic circuit and the physical garment together with the preliminary tests performed using one volunteer subject. Comparison of the device with a commercially available spirometer demonstrates that tidal volume can be monitored over extended periods with a precision of ±10%. We further demonstrate the utility of the device to measure cardiac output and respiration effort.

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“…The rise of "invisibles" targets making wearable devices built into the commodities people use daily, such as clothes, shoes and jewellery [11]. Usage of the correct type of sensors would enable low-cost implementations that can be embedded in day-to-day clothes that facilitate long-term monitoring [12].Recently, many sensors suitable for tidal monitoring have been presented [13][14][15][16][17]. Electro-resistive sensors based on carbon polymers have shown a great potential for biomedical sensors, and specifically wearable sensors [18], and bio-impedance monitoring [19].…”

mentioning

confidence: 99%

“…Recently, many sensors suitable for tidal monitoring have been presented [13][14][15][16][17]. Electro-resistive sensors based on carbon polymers have shown a great potential for biomedical sensors, and specifically wearable sensors [18], and bio-impedance monitoring [19].…”

mentioning

confidence: 99%

Characterisation of Morphic Sensors for Body Volume and Shape Applications

Arja

Jayarathna

Naik

et al. 2019

Sensors

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Stretchable conductive materials are originally conceived as radio frequency (RF) and electromagnetic interference (EMI) shielding materials, and, under stretch, they generally function as distributed strain-gauges. These commercially available conductive elastomers have found their space in low power health monitoring systems, for example, to monitor respiratory and cardiac functions. Conductive elastomers do not behave linearly due to material constraints; hence, when used as a sensor, a full characterisation to identify ideal operating ranges are required. In this paper, we studied how the continuous stretch cycles affected the material electrical and physical properties in different embodiment impressed by bodily volume change. We simulated the stretch associated with breathing using a bespoke stress rig to ensure reproducibility of results. The stretch rig is capable of providing constant sinusoidal waves in the physiological ranges of extension and frequency. The material performances is evaluated assessing the total harmonic distortion (THD), signal-to-noise ratio (SNR), correlation coefficient, peak to peak (P-P) amplitude, accuracy, repeatability, hysteresis, delay, and washability. The results showed that, among the three controlled variables, stretch length, stretch frequency and fabric width, the most significant factor to the signal quality is the stretch length. The ideal working region is within 2% of the original length. The material cut in strips of >3 mm show more reliable to handle a variety of stretch parameter without losing its internal characteristics and electrical properties.Sensors 2020, 20, 90 2 of 35 services to achieve a pervasive response [7]. Even with the current state-of-the-art technologies, end sensors remain moderately larger in size, cumbersome to use and unsuitable for long-term monitoring. Sleep studies are a good example scenario where long-term vital parameter monitoring is paramount. The sleep monitoring system should provide minimum intrusion to sleep [8,9]; however, the t current state-of-the-art Polysomnography (PSG) [10] is time-consuming, expensive, limited to in-clinic and provides minimum comfort. The alternative at-home portable sleep study devices use the same conventional sensors in smaller package. A radical change in sensor technologies required to make vital monitoring devices comfortable and "invisible" to the user. The rise of "invisibles" targets making wearable devices built into the commodities people use daily, such as clothes, shoes and jewellery [11]. Usage of the correct type of sensors would enable low-cost implementations that can be embedded in day-to-day clothes that facilitate long-term monitoring [12].Recently, many sensors suitable for tidal monitoring have been presented [13][14][15][16][17]. Electro-resistive sensors based on carbon polymers have shown a great potential for biomedical sensors, and specifically wearable sensors [18], and bio-impedance monitoring [19]. Electro-resistive sensors are made by re-purposing electromagnetic interfer...

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Measurements of PEEP-Induced Changes in Lung Volume

Cited by 8 publications

References 20 publications

Noninvasive monitoring of chest wall movement in infants using laser

Noninvasive monitoring of chest wall movement in infants using laser

A Wearable Contactless Sensor Suitable for Continuous Simultaneous Monitoring of Respiration and Cardiac Activity

Characterisation of Morphic Sensors for Body Volume and Shape Applications

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