Abstract
A simple expression is given for the estimation of transthoracic electrical impedance directly from externally measured dimensions of the thorax of a human subject. Clinically, the abnormalities due to an intrathoracic accumulation of fluid can be detected by comparing the estimated and the measured values of the impedances. A curve relating transthoracic electrical impedance and intrathoracic fluid volume is obtained by means of a computer program. The curve can be used for assessing the pulmonary oedema fluid quantitatively. The validity of the expression has been experimentally confirmed in 103 normal human subjects of various age groups, builds and of both sexes.
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