open access

Vol 87, No 4 (2019)
REVIEWS
Published online: 2019-08-14
Submitted: 2019-02-04
Accepted: 2019-06-17
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Impulse oscillometry

Unnati Desai, Jyotsna M. Joshi
DOI: 10.5603/ARM.a2019.0039
·
Pubmed: 31476011
·
Adv Respir Med 2019;87(4):235-238.

open access

Vol 87, No 4 (2019)
REVIEWS
Published online: 2019-08-14
Submitted: 2019-02-04
Accepted: 2019-06-17

Abstract

Pulmonary function testing involves a battery of tests from the simple pulse oximetry to the cardiopulmonary exercise testing. Impulse oscillometry (IOS) is one of the newly described pulmonary function tests. It is based on the old principle of forced oscillatory technique modified and refined as per research and advances. It involves the use of sound waves during normal tidal breathing, which gives information on oscillatory pressure-flow relationships and eventually resistance and reactance. The resistance at 20 Hz (R20) represents the resistance of the large airways. The resistance at 5 Hz (R5) means the total airway resistance. (R5–R20) reflects resistance in the small airways. The reactance at 5 Hz (X5) indicates the elastic recoil of the peripheral airways. Resonant frequency and area of reactance are also measured. IOS has major uses in diagnosis and control of asthma in children and the elderly, where spirometry is otherwise normal. IOS has been studied in other respiratory diseases like COPD, ILD and supraglottic stenosis.

Abstract

Pulmonary function testing involves a battery of tests from the simple pulse oximetry to the cardiopulmonary exercise testing. Impulse oscillometry (IOS) is one of the newly described pulmonary function tests. It is based on the old principle of forced oscillatory technique modified and refined as per research and advances. It involves the use of sound waves during normal tidal breathing, which gives information on oscillatory pressure-flow relationships and eventually resistance and reactance. The resistance at 20 Hz (R20) represents the resistance of the large airways. The resistance at 5 Hz (R5) means the total airway resistance. (R5–R20) reflects resistance in the small airways. The reactance at 5 Hz (X5) indicates the elastic recoil of the peripheral airways. Resonant frequency and area of reactance are also measured. IOS has major uses in diagnosis and control of asthma in children and the elderly, where spirometry is otherwise normal. IOS has been studied in other respiratory diseases like COPD, ILD and supraglottic stenosis.

Get Citation

Keywords

R5, R20, X5, impedance, resistance, reactance

About this article
Title

Impulse oscillometry

Journal

Advances in Respiratory Medicine

Issue

Vol 87, No 4 (2019)

Pages

235-238

Published online

2019-08-14

DOI

10.5603/ARM.a2019.0039

Pubmed

31476011

Bibliographic record

Adv Respir Med 2019;87(4):235-238.

Keywords

R5
R20
X5
impedance
resistance
reactance

Authors

Unnati Desai
Jyotsna M. Joshi

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