Evaluation of Multi-Frequency Bio-Impedance Analysis for the Assessment of Extracellular and Total Body Water in Surgical Patients

1994 ◽  
Vol 86 (4) ◽  
pp. 479-485 ◽  
Author(s):  
W. J. Hannan ◽  
S. J. Cowen ◽  
K. C. H. Fearon ◽  
C. E. Plester ◽  
J. S. Falconer ◽  
...  
Keyword(s):  
Coefficient Of Variation ◽  
Total Body Water ◽  
Impedance Analysis ◽  
Body Water ◽  
Surgical Patients ◽  
Single Frequency ◽  
Plasma Sodium ◽  
Dependent Variables ◽  
Clinically Significant ◽  
Total Body

1. Multi-frequency bio-impedance analysis has been used to estimate extracellular and total body water in a heterogeneous group of 43 surgical patients (23 males, 20 females). 2. Radioisotope-dilution methods were used for the measurement of extracellular and total body water. 3. Resistance and reactance were measured between wrist and ankle at frequencies from 5 kHz to 1 MHz. 4. Extracellular and total body water were estimated by multiple stepwise regression using the radioisotope values as the dependent variables. The parameters included in the regression were: resistance and reactance at each frequency, body habitus parameters, plasma albumin and plasma sodium. 5. The standard errors of the estimates between the measured and esitmated values were 1.73 litres (coefficient of variation 9.6%) and 2.17 litres (coefficient of variation 6.0%) for extracellular and total body water, respectively. 6. These errors represent a useful improvement relative to those obtained from anthropometric estimates. However, the improvements relative to the use of a single frequency (50 kHz) are not clinically significant.

Comparison of Bio-Impedance Spectroscopy and Multi-Frequency Bio-Impedance Analysis for the Assessment of Extracellular and Total Body Water in Surgical Patients

1995 ◽  
Vol 89 (6) ◽  
pp. 651-658 ◽  
Author(s):  
W. J. Hannan ◽  
S. J. Cowen ◽  
C. E. Plester ◽  
K. C. H. Fearon ◽  
A. Debeau
Keyword(s):  
Impedance Spectroscopy ◽  
Total Body Water ◽  
Impedance Analysis ◽  
Body Water ◽  
Surgical Patients ◽  
Whole Body ◽  
Standard Errors ◽  
Spectroscopy Technique ◽  
Coefficients Of Variation ◽  
Total Body

1. Measurements of extracellular and total body water provide useful information on the nutritional status of surgical patients and may be estimated from whole-body bio-impedance measurements at different frequencies. 2. Resistance and reactance were measured at 50 frequencies from 5 kHz to 1 MHz in 29 surgical patients (17 males, 12 females) with a wide range of extracellular to total body water ratios. 3. A fit to the spectrum of reactance versus resistance data gave predicted resistances at frequencies zero and infinity. Values of extracellular and total body water determined by this bio-impedance spectroscopy technique were regressed against values obtained from radioisotope dilution. The standard errors of the estimate were 1.893l and 3.259l respectively. 4. Resistance indices (height2/resistance) at selected frequencies gave the highest correlations with extracellular and total body water at 5 kHz and 200 kHz respectively, and prediction equations derived from multiple stepwise regressions also showed these to be the optimum frequencies. The standard errors of the estimate for this multi-frequency bio-impedance analysis method were 1.937l and 2.606l for extracellular and total body water respectively. 5. To assess the ability of the two methods to measure changes in extracellular and total body water, reproducibility was assessed from repeat measurements 10 min apart in a subgroup of 15 patients. Bio-impedance spectroscopy gave mean coefficients of variation for extracellular and total body water of 0.9% and 3.0% respectively. For multi-frequency bio-impedance analysis the corresponding coefficients of variation were 0.9% and 0.6%. 6. It is concluded that a simple impedance analyser operating at only two frequencies compares favourably with the more complex spectroscopy technique for the determination of extracellular and total body water in surgical patients.

Indirect prediction of total body water content in healthy adult Beagles by single-frequency bioelectrical impedance analysis

2015 ◽  
Vol 76 (6) ◽  
pp. 547-553 ◽  
Author(s):  
Laurence Yaguiyan-Colliard ◽  
Caroline Daumas ◽  
Sana Bousbiat ◽  
Michel Jaffrin ◽  
Philippe Cardot ◽  
...  
Keyword(s):  
Water Content ◽  
Total Body Water ◽  
Bioelectrical Impedance Analysis ◽  
Healthy Adult ◽  
Bioelectrical Impedance ◽  
Impedance Analysis ◽  
Body Water ◽  
Single Frequency ◽  
Total Body

Bioelectrical impedance analysis does not detect an increase in total body water following isotonic fluid consumption

2019 ◽  
Vol 44 (10) ◽  
pp. 1116-1120
Author(s):  
Evan L. Matthews ◽  
Peter A. Hosick
Keyword(s):  
Total Body Water ◽  
Bioelectrical Impedance Analysis ◽  
Isotonic Saline ◽  
Bioelectrical Impedance ◽  
Impedance Analysis ◽  
Body Water ◽  
Single Frequency ◽  
Urine Specific Gravity ◽  
Isotonic Fluid ◽  
Total Body

Purpose: To determine if single-frequency foot-to-foot bioelectrical impedance analysis (BIA) can detect acute changes in total body water (TBW) following consumption of isotonic saline. All participants ate a sodium-free meal at 4 h prior to the data collection visit and had euhydration confirmed using urine specific gravity at the beginning of the experimental visit. Subjects drank 466 mL of isotonic saline (Na+ 140 mmol·L−1) following baseline measures. Blood sampling and BIA were performed at baseline and every 30 min for 3 h after saline consumption. Ten healthy participants completed this study. Plasma volume (5%Δ, p < 0.001) and serum sodium concentration (1%Δ, p < 0.001) increased by 60 min and 90 min, respectively. Body mass (p < 0.001) displayed a biphasic response increasing to a peak at 30 min (+0.38Δkg) and then decreasing to its minimum at 180 min (–0.35Δkg). BIA impedance (p = 0.678) was unaffected by the saline administration. BIA-derived TBW (p = 0.039) decreased from baseline starting at 150 min (0.21Δkg). Novelty Athletes and coaches wishing to achieve hyperhydration can do so through the consumption of isotonic fluid. 50 kHz foot-to-foot BIA-derived TBW is inadequate for measuring hyperhydration. Future studies should examine the physiological and performance effects of such a hyperhydration protocol.

Single- and multifrequency models for bioelectrical impedance analysis of body water compartments

1999 ◽  
Vol 87 (3) ◽  
pp. 1087-1096 ◽  
Author(s):  
R. Gudivaka ◽  
D. A. Schoeller ◽  
R. F. Kushner ◽  
M. J. G. Bolt
Keyword(s):  
Total Body Water ◽  
Bioelectrical Impedance Analysis ◽  
Deuterium Oxide ◽  
Bioelectrical Impedance ◽  
Impedance Analysis ◽  
Ringer Solution ◽  
Body Water ◽  
Single Frequency ◽  
Water Compartments ◽  
Total Body

The 1994 National Institutes of Health Technology Conference on bioelectrical impedance analysis (BIA) did not support the use of BIA under conditions that alter the normal relationship between the extracellular (ECW) and intracellular water (ICW) compartments. To extend applications of BIA to these populations, we investigated the accuracy and precision of seven previously published BIA models for the measurement of change in body water compartmentalization among individuals infused with lactated Ringer solution or administered a diuretic agent. Results were compared with dilution by using deuterium oxide and bromide combined with short-term changes of body weight. BIA, with use of proximal, tetrapolar electrodes, was measured from 5 to 500 kHz, including 50 kHz. Single-frequency, 50-kHz models did not accurately predict change in total body water, but the 50-kHz parallel model did accurately measure changes in ICW. The only model that accurately predicted change in ECW, ICW, and total body water was the 0/∞-kHz parallel (Cole-Cole) multifrequency model. Use of the Hanai correction for mixing was less accurate. We conclude that the multifrequency Cole-Cole model is superior under conditions in which body water compartmentalization is altered from the normal state.

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