Measurement and model-interpretation of new parameters of lung mechanics
Müller, E.; Vogel, J.
Zeitschrift für Erkrankungen der Atmungsorgane 157(3): 340-344
1981
ISSN/ISBN: 0303-657X PMID: 7340223 Document Number: 177943
In 34 subjects (healthy and patients with obstructive and restrictive lung diseases) the components R and X of the respiratory impedance were measured in relation to the oscillatory frequency f by means of the forced oscillations technique. Using a frequency range from 5 to 30 Hz we found significant differences in these three groups of subjects for the frequency dependence of the R(f) and X(f) curves. A model-analysis showed that frequency dependence of R and X is mainly caused by the influence of the compliance of the central and upper airways. The magnitude of this influence is a function of the peripheral airway resistance.