Use of Bioelectrical Impedance Analysis to Measure Total Body Water in Patients with Cystic Fibrosis

Azcue, Maria P.; Fried, M.; Pencharz, Paul B.

doi:10.1097/00005176-199305000-00017

Cited by 38 publications

(28 citation statements)

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“…The observed variation in our patients with CF and healthy controls thus appears to be largely attributable to limitations in the skinfold method. In patients with CF, similar coef®cients of variation as compared to deuterium dilution have been reported for bioelectrical impedance analysis [2,5], but equations for calculation of FFM are less well established for this method than for the four skinfold method.…”

Section: Discussionmentioning

confidence: 65%

Skinfold measurements in children with cystic fibrosis: monitoring fat-free mass and exercise effects

Meer

Gulmans

Westerterp

et al. 1999

European Journal of Pediatrics

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Section: Discussionmentioning

confidence: 65%

Skinfold measurements in children with cystic fibrosis: monitoring fat-free mass and exercise effects

Meer

Gulmans

Westerterp

et al. 1999

European Journal of Pediatrics

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“…Thus in normal children Davies et al [4] found that a = 0.60 10hm/cm 2, whereas in cystic fibrosis patients Azcue et al [5] found a = 0.68 10hm/cm a, and Gregory et al [6] determined a = 0.55 10hm/cm 2 for children with a range of growth disorders. The significance of the broad agreement between these values of a is that they were determined by two independent methods, one using isotopes [4][5][6] and this study which used changes in TBW measured by ultrafiltration. This provides further evidence that the simple electrical model of the body which underpins the analysis of most single-frequency impedance measurements is of some utility.…”

Section: Discussionmentioning

confidence: 99%

“…Correspondence to: M. Bradbury, Department of Paediatrics, St. James's University Hospital, Leeds LS9 7TF, UK in adults [3], normal children [4], children with cystic fibrosis [5], growth disorders, diabetes and inflammatory bowel disease [6]. Bioelectrical impedance has not previously been validated as a measure of TBW in children with renal insufficiency.…”

Section: The Technique Has Been Validatedmentioning

confidence: 99%

Assessment of the sensitivity of bioimpedance to volume changes in body water

1995

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The sensitivity of whole-body electrical impedance measurements to changes in the volume of total body water in 12 children undergoing haemodialysis has been assessed. The impedance (I) of each child was measured at 20-min intervals during dialysis using the standard four-electrode technique to apply a constant current (800 microA, 50 kHz) between the wrist and ankle on the non-fistula side of the patient. The ultrafiltration volume (U) was also recorded. A simple electrical model suggests that U = aHt2 ((1/I0)-(1/I)), where I0 is the whole body impedance at the start of dialysis, a is a constant and Ht is patient height. No significant changes in I were measured on 4 patients undergoing dialysis without ultrafiltration, whereas in 8 patients undergoing ultrafiltration and dialysis I increased. Linear regression analysis and the above equation gave a mean value for a = 0.566 1 Ohm/cm2 (coefficient of variation = 3%), (mean r = 0.97), values comparable to those values obtained from isotope dilution studies. Predicted fluid loss in 8 patients following a single dialysis session gave a mean overestimate of 4.3% (limits of agreement 27.3% and -19.7%), although in 6 of the patients agreement was to within 6%. Changes in impedance reflect changes in total body water in children undergoing haemodialysis and are relatively insensitive to factors such as the possible differences in electrolyte levels between these patients.

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“…Empirical estimates from body weight (BWt) and height (Ht) fail to provide reliable indices of nutritional status especially in clinical conditions with variable hydration and density of the fat-free mass (FFM). Furthermore, bio-electrical impedance analysis (BIA), for predicting total body water (TBW) in particular, as the water containing body compartments conduct the electrical current, may not be universally applicable because of confounding variables, such as interference from nearby equipment, or inappropriate prediction equations that may generate significant bias and variability when applied clinically (Azcue et al, 1993;Bedogni et al, 1996) or in healthy children (Wells et al, 1999).…”

Section: Introductionmentioning

confidence: 99%

The potential of near infra-red interactance for predicting body composition in children

2001

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Objective: To establish whether near infra-red interactance (NIRI) has potential for use instead of skinfold thickness (SFT) measurements in the assessment of body composition in young children. Design: Strengths of relationships were established between NIRI or SFT measurements and four-component model (4-CM) assessments of body composition. Subjects: Nineteen boys and 19 girls, aged 8 -12 y. Measurements: 4-CM estimates of body composition were obtained from measurements of body weight, body volume, bone mineral content and total body water. SFT and NIRI were measured at the same four recognized sites (biceps, triceps, subscapular and suprailiac). Results: All children subjectively expressed a preference for NIRI rather than SFT calipers. Although SFTs were slightly more strongly and consistently related to 4-CM estimates, NIRI measurements at the biceps, subscapular and sum of four sites were significantly related to body composition indices. Subscapular NIRI measurements were as successful as subscapular SFTs in ranking subjects relative to 4-CM fatness, both techniques being most successful at lower levels of fatness. Conclusion: NIRI has potential for use instead of SFT for estimating body composition in young children. Its contribution may prove to be greatest in sick children in whom SFT measurements may be unwelcome, and weight-for-height indices of little value due to abnormalities of water distribution. However, greater numbers are required to develop child-specific prediction equations and the viability and validity of NIRI in pediatric patients is still to be evaluated. Descriptors: four-component model; body fat; fat-free mass; skinfold thickness

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Use of Bioelectrical Impedance Analysis to Measure Total Body Water in Patients with Cystic Fibrosis

Cited by 38 publications

References 0 publications

Skinfold measurements in children with cystic fibrosis: monitoring fat-free mass and exercise effects

Skinfold measurements in children with cystic fibrosis: monitoring fat-free mass and exercise effects

Assessment of the sensitivity of bioimpedance to volume changes in body water

The potential of near infra-red interactance for predicting body composition in children

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