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Equipment using an impedance technique for automatic recording of fluid-volume changes during haemodialysis

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Abstract

An instrument for continuous monitoring of fluid-volume changes has been developed. A tetrapolar whole-body impedance technique is employed with a constant current of 100 μA at 1·5 kHz and 150 kHz. A microprocessor automatically calculates changes in fluid volume from changes in whole-body impedance. Body-surface area is used as a normalising factor together with an empirically determined constant to obtain readings expressed in litres. Estimates of fluid-volume changes obtained by the method were compared with concomitant changes in the body weight of ten patients undergoing haemodialysis, and a correlation coefficient of 0·89 was found.

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  1. Department of Medical Engineering, Karolinska Institute, S-10401, Stockholm, Sweden

    B. Tedner

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  1. B. Tedner
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Tedner, B. Equipment using an impedance technique for automatic recording of fluid-volume changes during haemodialysis. Med. Biol. Eng. Comput. 21, 285–290 (1983). https://doi.org/10.1007/BF02478495

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  • DOI: https://doi.org/10.1007/BF02478495

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