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[Monitoring of extra- and intra-cellular compartment through total body impedance (author's transl)].

To evaluate the extra-cellular space, we measure the impedance (or resistance) of the extra-cellular electrolyte compartment with an alternating current at a fixed frequency of 5 kHz that can't pass through the cellular membrane. Total water is measured by the impedance to a current of 1 MHz which is conducted by extra and intra cellular hydro-electrolytic space. There is a good correlation between electrical impedance measurements and distribution of isotopic markers. The extra-cellular compartment was evaluated by diffusion of D.T.P.A. marked with 99mTc or with 111In and the total water by the diffusion of Antipyrin marked with 1,311 or 1,231. The findings indicate that there is not a significant difference between the results of the size of extra-cellular water measured by electrical impedance and D.T.P.A. diffusion (r = 0.75). Comparable results have been obtained in the determination of total water by electrical impedance measure and diffusion of Antipyrin (r = 0.90). We have also studied by method of electric impedance:--The state of hydratation in head injured patients and after pituitary surgery.--The lean body mass and hydro-electrolyte compartments in pregnancy. Electrical impedance measure seems to be a simple and reliable method to assess the hydric state of patients.