Estimation of extracellular space and blood volume using bioelectrical impedance measurements.
Clin Investig
; 70(7): 600-5, 1992 Jul.
Article
em En
| MEDLINE
| ID: mdl-1392430
ABSTRACT
The bromide-82 dilution space (extracellular space, ECS) and blood volume (BV) were measured in 21 patients with esophageal and gastric cancer and in 27 patients 18-96 months after total gastrectomy. Resistance (R) and reactance (Xc) from bioelectrical impedance measurements were used to obtain multiple regression equations for ECS and BV. The variables weight, gender, and height 2/Xc were independent predictors of ECS (r = 0.767; P less than 0.0001). Height 2/R and gender were predictors of blood volume (r = 0.856; P less than 0.0001). The mean difference between the Br space and the ECS predicted from impedance measurements was 0 +/- 1.54 (mean +/- SD). The limits of agreement (+/- 2 SD) were therefore +/- 3.08 l or 19.6% of the mean Br space of 15.7 l. The limits of agreement for BV were +/- 789 ml or +/- 19.7% of the average BV of 4008 ml. It is concluded that bioelectrical impedance plethysmography using a single frequency can be used for the estimation of ECS and BV. The wide limits of agreement, however, may limit its used in clinical practice.
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Base de dados:
MEDLINE
Assunto principal:
Pletismografia de Impedância
/
Determinação do Volume Sanguíneo
/
Composição Corporal
/
Espaço Extracelular
Idioma:
En
Ano de publicação:
1992
Tipo de documento:
Article