The use of bioimpedance spectroscopy to monitor water changes induced by rehydration in young children with abnormal water disturbances associated with diarrheal disease

Meyer, A.; Mazariegos, Manolo; Solomons, Noel W.; Fürst, Peter

doi:10.1016/s0969-8043(97)00192-9

Cited by 9 publications

(5 citation statements)

References 2 publications

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“…Hannan et al (19) reported that the BIS method did not accurately predict ECW and TBW, but the potential cause was not discussed. Hannan et al (personal communication) have observed f c values approaching 1 MHz, and this is consistent with the recent report of Meyer et al (37). With an f c of 1 MHz, which is equal to the highest frequency measured, an accurate determination of R ϱ would be extremely difficult because there would be data on only one side of the semicircle to fit (Fig.…”

Section: Discussionsupporting

confidence: 87%

“…It has long been known that f c changes considerably when tissue hydration changes (30). For example, f c values Ͼ200 kHz have been reported in hemodialysis patients (11), and f c values Ͼ500 kHz have been reported in young children with severe diarrheal disease (37). Although it is unsound to fit a theory to a result, the ratio of the 20; 500 Ϫ 5, ⌬ICW predicted by the difference between 500-kHz R-predicted TBW and 5-kHz R-predicted ECW (19,20).…”

Section: Discussionmentioning

confidence: 99%

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A comparison of bioimpedance methods for detection of body cell mass change in HIV infection

Earthman

Matthie

Reid

et al. 2000

Journal of Applied Physiology

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The maintenance of body cell mass (BCM) is critical for survival in human immunodeficiency virus (HIV) infection. Accuracy of bioimpedance for measuring change (Delta) in intracellular water (ICW), which defines BCM, is uncertain. To evaluate bioimpedance-estimated DeltaBCM, the ICW of 21 weight-losing HIV patients was measured before and after anabolic steroid therapy by dilution (total body water by deuterium - extracellular water by bromide) and bioimpedance. Multiple-frequency modeling- and dilution-determined DeltaICW did not differ. The DeltaICW was predicted poorly by 50-kHz parallel reactance, 50-kHz impedance, and 200 - 5-kHz impedance. The DeltaICW predicted by 500 - 5-kHz impedance was closer to, but statistically different from, dilution-determined DeltaICW. However, the effect of random error on the measurement of systematic error in the 500 - 5-kHz method was 12-13% of the average measured DeltaICW; this was nearly twice the percent difference between obtained and threshold statistics. Although the 500 - 5-kHz method cannot be fully rejected, these results support the conclusion that only the multiple-frequency modeling approach accurately monitors DeltaBCM in HIV infection.

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Section: Discussionsupporting

confidence: 87%

Section: Discussionmentioning

confidence: 99%

A comparison of bioimpedance methods for detection of body cell mass change in HIV infection

Earthman

Matthie

Reid

et al. 2000

Journal of Applied Physiology

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“…Even the generation of TBW by SF‐BIA in clinical populations is potentially erroneous due to the assumption that 50 kHz is a high enough frequency to overcome membrane capacitance to completely quantify both ICW and ECW. Studies have demonstrated that in certain disease states, much higher frequencies are required in order to fully quantify TBW 28 , 29 . At 50 kHz frequency, the method is actually measuring the weighted sum of ECW and ICW resistivities rather than TBW; therefore, it estimates TBW without distinguishing between or measuring the individual ECW and ICW volumes 11 , 22 .…”

Section: Bioimpedance For Estimating Whole Body Compositionmentioning

confidence: 99%

Bioimpedance at the Bedside

et al. 2015

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The loss of muscle mass is a defining characteristic of malnutrition, and there is ongoing interest in the assessment of lean tissue at the bedside. Globally, bioimpedance techniques have been widely appreciated for their noninvasiveness, safety, ease of use, portability, and relatively low cost compared with other clinically available methods. In this brief update, we review the 3 primary types of commercially available bioimpedance devices (single- and multiple-frequency and spectroscopy) and differentiate the underlying theory and current applications of each. We also address limitations and potential opportunities for using these devices at the bedside for clinical assessment. Mixed reports in the validation literature for all bioimpedance approaches have raised questions about absolute accuracy to estimate whole body composition in clinical populations, particularly those with abnormal fluid status and/or body geometry in whom underlying method assumptions may be violated. Careful selection of equations can improve whole body estimates by single- and multiple-frequency techniques; however, not all devices will allow for this approach. Research is increasing on the use of bioimpedance variables including phase angle and impedance ratio as potential markers of nutrition status and/or clinical outcomes; consensus on reference cut-points for interpreting these markers has yet to be established. Novel developments in the bioimpedance spectroscopy approach are allowing for improved fluid management in individuals receiving dialysis; these developments have implications for the clinical management of other conditions associated with fluid overload and may also provide enhanced whole body estimates of lean tissue through new modeling procedures.

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“…13 Furthermore, it has been shown that f c can vary quite markedly in different clinical populations, ranging from 200 kHz in dialysis patients 14 to 500 kHz in young children with severe diarrheal disease. 24 In healthy individuals, f c has been found to be in the range of 30 -60 kHz, and thus, SF-BIA at 50 kHz can theoretically measure TBW with accuracy. 14 Neither SF-BIA nor MF-BIA can account for variation in f c .…”

Section: Bioimpedance Spectroscopy (Bis): a Field Methods For Measurinmentioning

confidence: 99%

Bioimpedance Spectroscopy for Clinical Assessment of Fluid Distribution and Body Cell Mass

et al. 2007

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Body composition assessment has been used to evaluate clinical interventions in research trials, and has the potential to improve patient care in the clinical setting. Body cell mass (BCM) is an important indicator of nutrition status; however, its measurement in the clinic has been limited. BCM can be estimated by the measurement of intracellular water (ICW). The assessment of extracellular water (ECW) is also important because many clinical populations undergo alterations in fluid distribution, particularly individuals with wasting, those receiving dialysis, and obese individuals. Bioimpedance spectroscopy (BIS) is a unique bioimpedance approach that differs in underlying basis from the more readily recognized single-frequency bioelectrical impedance analysis (SF-BIA) in that it does not require the use of statistically derived, population-specific prediction equations. It has the potential advantage of not only measuring total body water (TBW), as does SF-BIA, but also offering the unique capacity to differentiate between ECW and ICW and, thus, to provide an estimate of BCM. This literature review was conducted to compare available BIS devices to multiple dilution for measuring fluid compartments or BCM in a number of populations. Variable results regarding the ability of BIS to measure absolute volumes, as well as the observation of wide limits of variation, make BIS problematic for individual assessment in the clinic, particularly in populations with abnormal fluid distribution or body geometry. BIS has been found to be more accurate for measuring changes in fluid volumes or BCM, particularly in post-surgical and human immunodeficiency virus (HIV)-infected individuals. It is certainly possible that population-specific adjustments may improve the accuracy of BIS for assessing individuals in the clinical setting; however, additional research and development is needed before the method can be accepted for routine clinical use.

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The use of bioimpedance spectroscopy to monitor water changes induced by rehydration in young children with abnormal water disturbances associated with diarrheal disease

Cited by 9 publications

References 2 publications

A comparison of bioimpedance methods for detection of body cell mass change in HIV infection

A comparison of bioimpedance methods for detection of body cell mass change in HIV infection

Bioimpedance at the Bedside

Bioimpedance Spectroscopy for Clinical Assessment of Fluid Distribution and Body Cell Mass

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