Total body water and ECFV measured using bioelectrical impedance analysis and indicator dilution in horses

2000 ◽  
Vol 89 (2) ◽  
pp. 663-671 ◽  
Author(s):  
Mariann Forro ◽  
Scott Cieslar ◽  
Gayle L. Ecker ◽  
Angela Walzak ◽  
Jay Hahn ◽  
...  
Keyword(s):  
Total Body Water ◽  
Bioelectrical Impedance Analysis ◽  
Deuterium Oxide ◽  
Bioelectrical Impedance ◽  
Impedance Analysis ◽  
Body Water ◽  
Indicator Dilution ◽  
Fluid Volume ◽  
Sodium Thiocyanate ◽  
Total Body

The purposes of this study were 1) to determine the compartmentation of body water in horses by using indicator dilution techniques and 2) to simultaneously measure bioelectrical impedance to current flow at impulse current frequencies of 5 and 200 kHz to formulate predictive equations that could be used to estimate total body water (TBW), extracellular fluid volume (ECFV), and intracellular fluid volume (ICFV). Eight horses and ponies weighing from 214 to 636 kg had catheters placed into the left and right jugular veins. Deuterium oxide, sodium thiocyanate, and Evans blue were infused for the measurement of TBW, ECFV, and plasma volume (PV), respectively. Bioelectrical impedance was measured by using a tetrapolar electrode configuration, with electrode pairs secured above the knee and hock. Measured TBW, ECFV, and PV were 0.677 ± 0.022, 0.253 ± 0.006, and 0.040 ± 0.002 l/kg body mass, respectively. Strong linear correlations were determined among measured variables that allowed for the prediction of TBW, ECFV, ICFV, and PV from measures of horse length or height and impedance. It is concluded that bioelectrical impedance analysis (BIA) can be used to improve the predictive accuracy of noninvasive estimates of ECFV and PV in euhydrated horses at rest.

scholarly journals The prediction of total body water from bioelectrical impedance in patients with anorexia nervosa

1997 ◽  
Vol 78 (3) ◽  
pp. 357-365 ◽  
Author(s):  
L. Scalfi ◽  
G. Bedogni ◽  
M. Marra ◽  
G. Di Biase ◽  
A. Caldara ◽  
...  
Keyword(s):  
Total Body Water ◽  
Bioelectrical Impedance Analysis ◽  
Deuterium Oxide ◽  
Bioelectrical Impedance ◽  
Population Level ◽  
Impedance Analysis ◽  
Body Water ◽  
Powerful Predictor ◽  
Total Body ◽  
The Individual

Total body water (TBW) was measured by deuterium oxide (D2O) dilution and predicted from bioelectrical impedance (Z) in nineteen anorexic and twenty-seven control women. The equation of Kushner et al. (1992) based on the impedance index (ZI = height2/Z) gave biases of 0.9 (sd 2.5) and 0.8 (sd 2.5) litres in controls and patients respectively (NS, ANOVA). The ZI-based equation of Deurenberg et al. (1993) gave biases of 1.5 (sd 2.4) litres (NS) and 3.0 (sd 2.1) litres (P <0.001) in controls and patients respectively. Despite the fact that weight was the most powerful predictor of TBW on the study sample (n 46, r2 0.90, P < 0.0001, se of the estimate 1.6 litres, CV 5.7%), the formulas of Segal et al. (1991) and Kushner et al. (1992) based on the association of weight and ZI gave an inaccurate prediction of TBW in both control and anorexic subjects, with a bias ranging from -3.2 (sd 2.4) to 2.9 (sd 2.1) litres (P ≤0.001). Population-specific formulas based on ZI (n 46) gave a more accurate prediction of TBW by bioelectrical impedance analysis on the study subjects, with biases of -0.1 (sd 1.8) and 0.5 (sd 1.7) litres in controls and patients respectively (NS). However, the individual bias was sometimes high. It is concluded that bioelectrical impedance analysis can be used to predict TBW in anorexic women at a population level, but the predictions are less good than those based on body weight alone.

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.

Multifrequency bioelectrical impedance estimates the distribution of body water

1995 ◽  
Vol 79 (4) ◽  
pp. 1316-1319 ◽  
Author(s):  
K. Cha ◽  
G. M. Chertow ◽  
J. Gonzalez ◽  
J. M. Lazarus ◽  
D. W. Wilmore
Keyword(s):  
Renal Disease ◽  
Total Body Water ◽  
Bioelectrical Impedance Analysis ◽  
Deuterium Oxide ◽  
Bioelectrical Impedance ◽  
Impedance Analysis ◽  
Body Water ◽  
Endstage Renal Disease ◽  
Standard Of Comparison ◽  
Total Body

Multifrequency bioelectrical impedance analysis was used to estimate the ratio of extracellular water (ECW) to total body water in subjects with end-stage renal disease. The body's resistance was measured at frequencies ranging from 1 kHz to 1 MHz. The impedance index (height2/resistance) determined at low frequency (5 kHz) correlated most closely with ECW (r = 0.886) using sodium bromide dilution as the standard of comparison. In contrast, the ratio of height squared to resistance determined at high frequency (500 kHz) correlated most closely with total body water (r = 0.974) using deuterium oxide dilution as the standard of comparison. The ratio of resistance at 500 kHz to resistance at 5 kHz was directly correlated (r = 0.767) with the ratio of ECW to total body water. Multifrequency bioelectrical impedance analysis may assist in the evaluation of body water distribution in endstage renal disease and other clinical disorders of fluid volume and/or distribution.

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