Abstract
For the purpose of total body fluid (TBF) control, the concept of lean body mass (LBM) can be introduced when the urea space (US), which represents the amount of TBF, is measured. This is because the ratio of US to LBM becomes constant in the normal body. An experimental equation for LBM could be expressed in the form of a linear equation, using the remainder of the height (H) and girth (G). When this equation was adopted, US was also given in the form of a linear equation of (H-G). In those patients who could not be represented by our equation, we found 3 of 4 patients who were overhydrated, with accompanying salt-water dependent hypertension and corpulence of the heart. It should be possible to control the amount of TBF by measuring H, G and US.
In another 11 patients, whose TBF was well controlled, the ratio of US to LBM was calculated to be in the range of 65 to 70%·The amount of TBF should therefore be evaluated on the basis of LBM.
We reached the conclusion that an ideal TBF for each patient could be set up by our method.
