Assessment of impulse oscillometry parameters

Abstract

To investigate reproducibility and repeatability of general parameters of impulse oscillometry (IOS) we performed 450 repeated measurements in 10 healthy persons (5 males, 5 females). The oscillation flows with frequencies of 5 to 35 Hz and pressure less than 0.2 kPa were laid on the normal tidal breathing. There were 3 phases of the examination with 60 min intervals for a day. Each phase included 3 to 5 measurements under the condition of normal tidal breathing. The examination repeated 5 times every 7 days. We measured respiratory impedance in the oscillatory frequency of 5 Hz, resonance frequency, resistance in the frequencies of 5, 20, and 35 Hz (R5, R20, R35), frequency dependence of the resistance, reactance in the frequencies of 5 and 35 Hz (X5 and X35) and the X5 deviation from the predictive values. Reference values according to J. Vogel and U. Smidt were used as predictive ones.

The results obtained were comparable with the mean square deviation of the respiratory impedance 0.25 gPa / L / s obtained by F.J. Landser et al. and it was less than the individual bios of components of the respiratory impedance according to A.I. Dyachenko's data. The reproducibility and repeatability of the general parameters of the impulse oscillometry increase the reliability and substantiation of functional diagnosis. They are necessary to determine disorders of the respiratory mechanics and to evaluate their follow-up dynamics.