HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in ISI Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via ISI Web of Science (26) Citing Articles via Google Scholar Google Scholar Articles by Hellinckx, J. Articles by Demedts, M. Search for Related Content PubMed PubMed Citation Articles by Hellinckx, J. Articles by Demedts, M.

Evaluation of impulse oscillation system: comparison with forced oscillation technique and body plethysmography

¹ Dept of Paediatrics and ² Laboratory of Pneumology, Katholieke Universiteit, Leuven, Belgium

CORRESPONDENCE: M. Demedts, Laboratory for Pneumology, U.Z. Gasthuisberg, Herestraat 49, B-3000, Leuven, Belgium. Fax: 016346803

Keywords: airway resistance, body plethysmography, forced oscillation technique, impulse oscillation system, impedance, reactance

Received: May 23, 2000
Accepted April 26, 2001

This study was funded by the National Fund for Scientific Research action "Care for Life", project numbers 7.0033.94, 7.0047.94 and 7.0078.94.

The impulse oscillation system (IOS) has been developed recently to measure respiratory system resistance (R_rs) and reactance (X_rs) at different frequencies up to 25 Hz. IOS has, however, not been validated against established techniques.

This study compared IOS with the classical pseudorandom noise forced oscillation technique (FOT) and body plethysmographic airway resistance (R_aw) in 49 subjects with a variety of lung disorders and a wide range of R_aw (0.10–1.28 kPa·L^–1·s).

R_rs,IOS was slightly greater than R_rs,FOT, especially at lower frequencies, with a mean±sd difference at 5–6 Hz of 0.14±0.09 kPa·L^–1·s. Comparisons with the wave-tube technique applied on two analogues indicated an overestimation by IOS. X_rs,IOS and X_rs,FOT were very similar, with a slightly higher resonant frequency with IOS than with FOT (mean difference±sd 1.35±3.40 Hz). R_aw was only moderately correlated with R_rs-FOT and R_rs-IOS; although the mean differences were small (0.04±0.14 kPa·L^–1·s for R_rs6,FOT and –0.10±0.14 kPa·L^–1·s for R_rs5,IOS), IOS and FOT markedly underestimated high resistance values.

In conclusion, the impulse oscillation system yields respiratory system resistance and reactance values similar, but not identical to those provided by the forced oscillation technique.