Knowledge of patient fluid distribution would be useful clinically. Both single-frequency (SF) and impedance modeling approaches are proposed. The high intercorrelation between body water compartments makes determining the best approach difficult. This study was conducted to evaluate the merits of an SF approach. Mathematical simulation was performed to determine the effect of tissue change on resistance and reactance. Dilution results were reanalyzed, and resistance and parallel reactance were used to predict the intracellular water for two groups. Results indicated that the amount of intracellular and extracellular water conduction at any SF can vary with tissue change, and reactance at any SF is affected by all tissue parameters. Modeling provided a good prediction of dilution intracellular and extracellular water, but an SF method did not. Intracellular, extracellular, and total body water were equally predicted at all frequencies by SF resistance and parallel reactance. Extracellular and intracellular water are best measured through modeling, because only at the zero and infinite frequencies are the results sensitive only to extracellular and intracellular water. At all other frequencies there are other effects.

Matthie, J., Zarowitz, B., De Lorenzo, A., Andreoli, A., Katzarski, K., Pan, G., et al. (1998). Analytic assessment of the various bioimpedance methods used to estimate body water. JOURNAL OF APPLIED PHYSIOLOGY, 84(5), 1801-16.

Analytic assessment of the various bioimpedance methods used to estimate body water

DE LORENZO, ANTONINO;ANDREOLI, ANGELA;
1998-05

Abstract

Knowledge of patient fluid distribution would be useful clinically. Both single-frequency (SF) and impedance modeling approaches are proposed. The high intercorrelation between body water compartments makes determining the best approach difficult. This study was conducted to evaluate the merits of an SF approach. Mathematical simulation was performed to determine the effect of tissue change on resistance and reactance. Dilution results were reanalyzed, and resistance and parallel reactance were used to predict the intracellular water for two groups. Results indicated that the amount of intracellular and extracellular water conduction at any SF can vary with tissue change, and reactance at any SF is affected by all tissue parameters. Modeling provided a good prediction of dilution intracellular and extracellular water, but an SF method did not. Intracellular, extracellular, and total body water were equally predicted at all frequencies by SF resistance and parallel reactance. Extracellular and intracellular water are best measured through modeling, because only at the zero and infinite frequencies are the results sensitive only to extracellular and intracellular water. At all other frequencies there are other effects.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore MED/49 - Scienze Tecniche Dietetiche Applicate
English
Deuterium Oxide; Middle Aged; Extracellular Space; Intracellular Fluid; Renal Dialysis; Electric Impedance; Models, Biological; Aged; Body Water; Humans; Coronary Artery Bypass
Matthie, J., Zarowitz, B., De Lorenzo, A., Andreoli, A., Katzarski, K., Pan, G., et al. (1998). Analytic assessment of the various bioimpedance methods used to estimate body water. JOURNAL OF APPLIED PHYSIOLOGY, 84(5), 1801-16.
Matthie, J; Zarowitz, B; DE LORENZO, A; Andreoli, A; Katzarski, K; Pan, G; Withers, P
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/11065
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