Die Ganzkörperplethysmographie

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Abstract
The clinical use of whole body plethysmography by whi ch the intrathoracic gas volume (IGV) and the resistance of the respiratory tract (R) can be measured directly represents a marked step forward in investigating lung function. Some sources of error were discussed in detail. If a simple cylindrical lung model is used for plethysmo-graphic volume estimations a mensuration error occurs. For human lungs, it was proved experimentally that conditions during measurements are very largely isothermal satisfying the most important prerequistic for estimating the IGV, whether Boyle-Mariotts''s law applies. With large amounts of air in the abdomen the values measured can alter but measurement of the IGV is not notable altered by the volume of gas normally present. For the plethysmographic measurement of R the recording of a curve of the complete respiratory cycle is of greater indicative value than the recording of panting curves. The influence of the RQ and of variations in air temperature in the chamber on the course of the curves can be corrected by additional apparatus in the chamber. The measurement of R will also be affected by the changes in the volume of the IGV during respiration so that for special investigations a corresponding correction is necessary which was delt with in detail, but for clinical investigations no such correction is necessary.

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