Bioelectrical impedance spectroscopy (BIS) in young children with acute and semi-acute hydration disorders: Potentials and limitations

Mazariegos, Manolo; Pithan, Christiane; Meyer, A.; Mendoza, Ivan; Fürst, Peter; Solomons, Noel W.

doi:10.1016/s0969-8043(97)00267-4

Cited by 12 publications

(5 citation statements)

References 5 publications

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“…Patterson and Latterell (1995) also noted that phase errors in BIS could be corrected by modification of the data modelling software. It would seem, therefore, premature to attempt to ascribe a physiological basis to T d or to interpret variations in T d as indicative of physiological change as proposed by some authors (De Lorenzo et al 1994, Chumlea and Guo 1994, Mazariegos et al 1996.…”

Section: Discussionmentioning

confidence: 99%

Sources of error in bioimpedance spectroscopy

Bolton

Ward²,

Khan

et al. 1998

Physiol. Meas.

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Two different makes of bioimpedance spectrometer (UniQuest-SEAC SFB-3 and Xitron 4000B) were used for a series of measurements on volunteers and patients in intensive care. Although each machine was accurate over the frequency range 5 to 500 kHz when bench tested on model resistor-capacitor circuits, significant differences in their recorded impedance parameters appeared when used in vivo, especially on intensive care patients. A series of laboratory tests was performed on each machine simulating the situation in vivo to identify possible reasons for these differences. Whilst stray capacitance in the environment was identified as the major contributor to variability in high-frequency performance, interaction between electrode impedance and lead positioning was also a factor. The observed phase shift with frequency or time delay (Td) used in the Xitron modeling software appears to be the result of a time constant caused by stray capacitance and so is unlikely to have any biological meaning. Significant differences in the in vivo numerical values produced by bioimpedance spectrometers may be attributed to instrument design, data processing and, in particular, the clinical environment.

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Section: Discussionmentioning

confidence: 99%

Sources of error in bioimpedance spectroscopy

Bolton

Ward²,

Khan

et al. 1998

Physiol. Meas.

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“…Moreover, BIA seems to be insufficiently suitable for large-population studies in free-living conditions ( 105 ) . Kyle et al ( 76 ) recommended that this method be used in only stable conditions.…”

Section: ‘Field’ Methods For Assessing Hydration Status: Advantages Amentioning

confidence: 99%

Assessment of hydration status in a large population

Baron

Courbebaisse

Lepicard³

et al. 2014

Br J Nutr

131

109

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Both acute and chronic dehydration can have important implications for human behaviour and health. Young children, non-autonomous individuals and the elderly are at a greater risk of dehydration. Mild hypertonic dehydration could be related to less efficient cognitive and physical performance and has been reported to be associated with frequently occurring pathological conditions, especially nephrolithiasis. The assessment of hydration status in a large sample appears to be of interest for conducting epidemiological and large clinical studies aimed at improving preventive and curative care. Especially in large-population studies, methods that are used have to be accurate, cheap, quick and require no technical expertise. Body weight change is widely used to determine acute hydration changes, but seems to be insufficiently accurate in longitudinal studies. Bioimpedance analysis methods enable the assessment of total body water content, but their use is still under debate. Because plasma osmolality directly reflects intracellular osmolality, it constitutes a good marker to assess acute hydration changes, but not chronic hydration status because it changes constantly. Moreover, venepuncture is considered to be invasive and is not suitable for a large-sample study, especially in children. Urinary markers appear to be good alternatives for assessing hydration status in large populations. Collection of urine samples is non-invasive and cheap. High technical expertise is not required to perform urinary marker measurements and these measurements can be carried out quickly. Thus, methods based on urinary markers are very well suited for field studies. Urine colour is probably the least sensitive marker despite its high specificity. Urine osmolality and especially urine specific gravity could be easily used for determining hydration status in large-sample studies.

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“…We found 1 reference to pacing impedance increase during dehydration in a living patient, 2 and whole body bioimpedance spectroscopy has been reported to be a reliable method of assessing hydration status in children 3 . We also found data in a dog model that revealed increases in transthoracic impedance (measured between an esophageal electrode and a skin patch) after death 4 .…”

Section: Discussionmentioning

confidence: 53%

Bioelectrical impedance spectroscopy (BIS) in young children with acute and semi-acute hydration disorders: Potentials and limitations

Cited by 12 publications

References 5 publications

Sources of error in bioimpedance spectroscopy

Sources of error in bioimpedance spectroscopy

Assessment of hydration status in a large population

Abrupt increase in impedance measurements as detected via remote monitoring: What is the cause?

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