Factors affecting transthoracic impedance signals used to measure breathing.

Logic, J L; Maksud, Michael G.; Hamilton, Lyle H.

doi:10.1152/jappl.1967.22.2.251

Cited by 29 publications

(16 citation statements)

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“…Regarding the effect of the thorax shape change, Logic et al [ 12 ] found an improvement in the linearity of the low-placed electrode configurations Figure 1 The four different electrode configurations used for IP recording. The electrodes of configuration A were placed on the arms between biceps and triceps brachii muscles at the level of the electrodes of configuration C and attention was paid to prevent skin contact between the arms and the sides.…”

mentioning

confidence: 99%

Novel electrode configuration for highly linear impedance pneumography

Seppä

Hyttinen²,

Uitto³

et al. 2013

Biomedizinische Technik/Biomedical Engineering

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Impedance pneumography (IP) is a non-invasive respiration measurement technique. Emerging applications of IP in respiratory medicine use the measured signal to monitor pulmonary flow and volume parameters related to airway obstruction during tidal breathing (TB). This requires a high impedance change (ΔZ)-to-lung volume change (ΔV) linearity. Four potential electrode configurations were tested on 10 healthy subjects. Only the novel configuration where the electrodes were placed in both the thorax and the arms yielded a highly linear ΔZ/ΔV in all subjects. The presented electrode configuration may expand the clinical use of IP from the conventional tidal volume estimation to flow measurement.

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mentioning

confidence: 99%

Novel electrode configuration for highly linear impedance pneumography

Seppä

Hyttinen²,

Uitto³

et al. 2013

Biomedizinische Technik/Biomedical Engineering

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“…Although rarely a problem in the adult this is of special importance in the premature infant where tidal volumes are small and respiratory frequency is high. Positioning the electrodes is of great importance [2]. The electrodes are sensitive not only to placement, but also to body position and to the mode of breathing.…”

Section: Critique Of the Methodsmentioning

confidence: 99%

“…Med. 5 (1977) 221 Quantitative estimation of Ventilation in newborn infants using the impedance pneumogram Changes in transthoracic impedance during breathing have been shown to bear a strong correlation to changes in lung volume in the adult [1][2][3][4][5]. If a linear correlation between tidal volume and changes in transthoracic impedance could be established for infants äs well äs adults, transthoracic impedance plethysmography would provide a non-invasive means of monitoring alterations of tidal volume during intensive care monitoring on newborn infants or during respiratory studies.…”

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confidence: 99%

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Quantitative estimation of ventilation in newborn infants using the impedance pneumogram

Li¹,

Krauss²,

Auld³

1977

Journal of Perinatal Medicine

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Impedance pneumography is potentially a non-invasive method of measuring infant tidal volumes. In order to evaluate the accuracy of impedance pneumography, eight healthy infants (weighing from 709 to 3506 grams) were randomly chosen and studied. Simultaneous measurements of tidal volumes were made by calibrated spirometry and by transthoracic impedance pneumography. The results were statistically compared. Transthoracic impedance pneumography provided a reliable estimate of tidal and minute volumes in these newborn infants.

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“…In the early 1950s, I demonstrated that approximate measures of ventilation could be obtained from pressure fluctuations within a small chest pneumograph (Shephard 1954). The development of the mercury/elastic strain gauge (Whitney 1953) and transthoracic impedance techniques (Logic et al 1967) have facilitated such measurements, although with a single sensor problems continue from varying proportions of abdominal and thoracic breathing as the intensity of exercise is increased. The accuracy of this approach has been improved through the use of algorithms linking both abdominal and thoracic movements as sensed by multiple electromagnets (Gastinger et al 2011;Robertson et al 1980;Stagg et al 1978) or changes in induction (Neumann et al 1998;Sackner et al 1989).…”

Section: Respiratory Minute Volumementioning

confidence: 99%

Measurement of human energy expenditure, with particular reference to field studies: an historical perspective

Shephard

Aoyagi

2011

Eur J Appl Physiol

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Over the years, techniques for the study of human movement have ranged in complexity and precision from direct observation of the subject through activity diaries, questionnaires, and recordings of body movement, to the measurement of physiological responses, studies of metabolism and indirect and direct calorimetry. This article reviews developments in each of these domains. Particular reference is made to their impact upon the continuing search for valid field estimates of activity patterns and energy expenditures, as required by the applied physiologist, ergonomist, sports scientist, nutritionist and epidemiologist. Early observers sought to improve productivity in demanding employment. Direct observation and filming of workers were supplemented by monitoring of heart rates, ventilation and oxygen consumption. Such methods still find application in ergonomics and sport, but many investigators are now interested in relationships between habitual physical activity and chronic disease. Even sophisticated questionnaires still do not provide valid information on the absolute energy expenditures associated with good health. Emphasis has thus shifted to use of sophisticated pedometer/accelerometers, sometimes combining their output with GPS and other data. Some modern pedometer/accelerometers perform well in the laboratory, but show substantial systematic errors relative to laboratory reference criteria such as the metabolism of doubly labeled water when assessing the varied activities of daily life. The challenge remains to develop activity monitors that are sufficiently inexpensive for field use, yet meet required accuracy standards. Possibly, measurements of oxygen consumption by portable respirometers may soon satisfy part of this need, although a need for valid longer term monitoring will remain.

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Factors affecting transthoracic impedance signals used to measure breathing.

Cited by 29 publications

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Novel electrode configuration for highly linear impedance pneumography

Novel electrode configuration for highly linear impedance pneumography

Quantitative estimation of ventilation in newborn infants using the impedance pneumogram

Measurement of human energy expenditure, with particular reference to field studies: an historical perspective

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