Segment-specific resistivity improves body fluid volume estimates from bioimpedance spectroscopy in hemodialysis patients

2006 ◽  
Vol 100 (2) ◽  
pp. 717-724 ◽  
Author(s):  
F. Zhu ◽  
M. K. Kuhlmann ◽  
G. A. Kaysen ◽  
S. Sarkar ◽  
C. Kaitwatcharachai ◽  
...  
Keyword(s):  
Gold Standard ◽  
Total Body Water ◽  
Body Fluid ◽  
Hemodialysis Patients ◽  
Fluid Volume ◽  
Whole Body ◽  
Bioimpedance Spectroscopy ◽  
Specific Resistivity ◽  
Body Fluid Volume ◽  
Total Body

Discrepancies in body fluid estimates between segmental bioimpedance spectroscopy (SBIS) and gold-standard methods may be due to the use of a uniform value of tissue resistivity to compute extracellular fluid volume (ECV) and intracellular fluid volume (ICV). Discrepancies may also arise from the exclusion of fluid volumes of hands, feet, neck, and head from measurements due to electrode positions. The aim of this study was to define the specific resistivity of various body segments and to use those values for computation of ECV and ICV along with a correction for unmeasured fluid volumes. Twenty-nine maintenance hemodialysis patients (16 men) underwent body composition analysis including whole body MRI, whole body potassium (40K) content, deuterium, and sodium bromide dilution, and segmental and wrist-to-ankle bioimpedance spectroscopy, all performed on the same day before a hemodialysis. Segment-specific resistivity was determined from segmental fat-free mass (FFM; by MRI), hydration status of FFM (by deuterium and sodium bromide), tissue resistance (by SBIS), and segment length. Segmental FFM was higher and extracellular hydration of FFM was lower in men compared with women. Segment-specific resistivity values for arm, trunk, and leg all differed from the uniform resistivity used in traditional SBIS algorithms. Estimates for whole body ECV, ICV, and total body water from SBIS using segmental instead of uniform resistivity values and after adjustment for unmeasured fluid volumes of the body did not differ significantly from gold-standard measures. The uniform tissue resistivity values used in traditional SBIS algorithms result in underestimation of ECV, ICV, and total body water. Use of segmental resistivity values combined with adjustment for body volumes that are neglected by traditional SBIS technique significantly improves estimations of body fluid volume in hemodialysis patients.

Some biochemical and physiological features of normal monkeys (Macaca radiata)

1963 ◽  
Vol 18 (6) ◽  
pp. 1231-1233 ◽  
Author(s):  
S. G. Srikantia ◽  
C. Gopalan
Keyword(s):  
Total Body Water ◽  
Body Fluid ◽  
Extracellular Fluid ◽  
Body Water ◽  
Fluid Volume ◽  
Extracellular Fluid Volume ◽  
Sodium Thiocyanate ◽  
Macaca Radiata ◽  
Hematological Indices ◽  
Total Body

Determinations of body-fluid spaces with antipyrine for total-body water and sodium thiocyanate for extracellular fluid volume, hematological indices, and several serum constituents in about 500 Macaca radiata monkeys revealed that most of the values obtained were very similar to values obtained in man. body fluid spaces; hematology Submitted on April 22, 1963

scholarly journals Bioimpedance spectroscopy for the estimation of body fluid volumes in mice

2010 ◽  
Vol 299 (1) ◽  
pp. F280-F283 ◽  
Author(s):  
M. E. Chapman ◽  
L. Hu ◽  
C. F. Plato ◽  
D. E. Kohan
Keyword(s):  
Body Composition ◽  
Body Weight ◽  
Body Fluid ◽  
Accurate Method ◽  
Repeated Measurements ◽  
Fluid Volume ◽  
Bioimpedance Spectroscopy ◽  
Body Fluid Volume ◽  
Similar Body ◽  
Resistance Coefficients

Conventional indicator dilution techniques for measuring body fluid volume are laborious, expensive, and highly invasive. Bioimpedance spectroscopy (BIS) may be a useful alternative due to being rapid, minimally invasive, and allowing repeated measurements. BIS has not been reported in mice; hence we examined how well BIS estimates body fluid volume in mice. Using C57/Bl6 mice, the BIS system demonstrated <5% intermouse variation in total body water (TBW) and extracellular (ECFV) and intracellular fluid volume (ICFV) between animals of similar body weight. TBW, ECFV, and ICFV differed between heavier male and lighter female mice; however, the ratio of TBW, ECFV, and ICFV to body weight did not differ between mice and corresponded closely to values in the literature. Furthermore, repeat measurements over 1 wk demonstrated <5% intramouse variation. Default resistance coefficients used by the BIS system, defined for rats, produced body composition values for TBW that exceeded body weight in mice. Therefore, body composition was measured in mice using a range of resistance coefficients. Resistance values at 10% of those defined for rats provided TBW, ECFV, and ICFV ratios to body weight that were similar to those obtained by conventional isotope dilution. Further evaluation of the sensitivity of the BIS system was determined by its ability to detect volume changes after saline infusion; saline provided the predicted changes in compartmental fluid volumes. In summary, BIS is a noninvasive and accurate method for the estimation of body composition in mice. The ability to perform serial measurements will be a useful tool for future studies.

Whole body impedance measurements reflect total body water changes. A study in hemodialysis patients

1990 ◽  
Vol 7 (3) ◽  
pp. 163-169 ◽  
Author(s):  
Olle Ljungqvist ◽  
Gunilla Hedenborg ◽  
Stefan H Jacobson ◽  
Lars-Eric Lins ◽  
Kickan Samuelson ◽  
...  
Keyword(s):  
Total Body Water ◽  
Hemodialysis Patients ◽  
Body Water ◽  
Whole Body ◽  
Impedance Measurements ◽  
Body Impedance ◽  
Total Body

Total Body Fluid Volume Determination Based on Urea Kinetics in Hemofiltration as an Index of Basal Body Weight in Uremic Patients

1986 ◽  
Vol 9 (3) ◽  
pp. 159-162 ◽  
Author(s):  
G. Kimura ◽  
M. Satani ◽  
S. Kojima ◽  
F. Saito ◽  
Y. Kawano ◽  
...  
Keyword(s):  
Body Weight ◽  
Basal Body ◽  
Body Fluid ◽  
Fluid Volume ◽  
Artificial Kidney ◽  
Volume Determination ◽  
Urea Kinetics ◽  
Body Fluid Volume ◽  
Uremic Patients ◽  
Total Body

Assuming that urea is distributed uniformly within the total body water, urea-space or total body fluid volume was determined in six uremic patients based on urea kinetics in hemofiltration. The total body fluid volume before hemofiltration was 36.0 ± 3.6 L (61.8 ± 2.6% BW) and after hemofiltration 32.5 ± 3.4 L (59.3 ± 2.8% BW), suggesting that the total body fluid volume was nearly normalized by hemofiltration. It is concluded that urea-space, easily measurable based on urea kinetics during hemofiltration, is useful in evaluating the fluid balance in patients undergoing artificial kidney therapy.

Estimation of whole-body capillary transport parameters from osmotic transient data

1982 ◽  
Vol 242 (3) ◽  
pp. R227-R236 ◽  
Author(s):  
M. B. Wolf
Keyword(s):  
Mathematical Model ◽  
Volume Regulation ◽  
Body Fluid ◽  
Fluid Volume ◽  
Whole Body ◽  
Transport Parameters ◽  
Mean Values ◽  
Body Fluid Volume ◽  
Fluid Volume Regulation ◽  
Cellular Water

A mathematical model has been developed of short-term, extrarenal, whole-body fluid volume regulation. The Kedem and Katchalsky equations are used to describe rapid movements of crystalloid and colloid solutes and water between five fluid compartments. Simulation results showing rapid cell volume changes following a hyperosmotic crystalloid infusion demonstrated the necessity of considering the effect of cellular water shifts in osmotic transient experiments. From measurements of plasma volume and osmolality in acutely nephrectomized dogs subjected to isosmotic and hyperosmotic NaCl infusions and with the model, six parameters related to capillary membrane transport of water and NaCl were estimated. The mean capillary filtration capacity from six experiments was estimated as 0.01 ml.min-1.mmHg-1.100 g-1 of dog. This increased about threefold due to the hyperosmolality. Mean values of capillary diffusion capacity and osmotic reflection coefficient for NaCl were 0.37 cm3.s-1.100 g-1 and 0.087, respectively. These results support the use of the osmotic transient approach and a mathematical model to study the role of microvascular transport in whole-body fluid volume regulation.

scholarly journals Estimation of Body Fluid Volume by Bioimpedance Spectroscopy in Patients with Hyponatremia

2014 ◽  
Vol 55 (2) ◽  
pp. 482 ◽  
Author(s):  
Jae Seok Kim ◽  
Jun Young Lee ◽  
Hyeoncheol Park ◽  
Byoung Geun Han ◽  
Seung Ok Choi ◽  
...  
Keyword(s):  
Body Fluid ◽  
Fluid Volume ◽  
Bioimpedance Spectroscopy ◽  
Body Fluid Volume

Effects of Single Set Resistance Training With Different Frequencies on a Cellular Health Indicator in Older Women

2018 ◽  
Vol 26 (4) ◽  
pp. 537-543 ◽  
Author(s):  
Alex S. Ribeiro ◽  
Matheus A. Nascimento ◽  
Brad J. Schoenfeld ◽  
João Pedro Nunes ◽  
Andreo F. Aguiar ◽  
...  
Keyword(s):  
Resistance Training ◽  
Older Women ◽  
Phase Angle ◽  
Total Body Water ◽  
Whole Body ◽  
Bioimpedance Spectroscopy ◽  
Health Indicator ◽  
Significant Difference ◽  
Total Body ◽  
Single Set

The main purpose of this study was to compare the effects of resistance training (RT) performed two versus three times per week on phase angle (a cellular health indicator) in older women. A total of 39 women (69.1 ± 5.5 years) were randomly assigned to perform a RT program two (G2X) or three (G3X) days per week for 12 weeks. The RT was a whole-body program (eight exercises, one set, 10–15 repetitions). Phase angle, resistance, reactance, and total body water were assessed by bioimpedance spectroscopy. Intracellular water, reactance, and phase angle increased significantly in G2X (2.1%, 3.0%, and 5.6%, respectively) and G3X (5.0%, 6.9%, and 10.3%, respectively) from pretraining to posttraining, with no significant difference between groups. Bioimpedance resistance decreased similarly in both groups (G2X = −1.7% vs. G3X = −3.2%). We conclude that a single set RT program with a frequency of 2 days per week may be sufficient to promote an improvement in cellular health in older women.

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