Negative impact of the noseclip on high-frequency respiratory impedance measurements

Thamrin, Cindy, Albu, Gergely, Sly, Peter D. and Hantos, Zoltan (2009) Negative impact of the noseclip on high-frequency respiratory impedance measurements. Respiratory Physiology & Neurobiology, 165 1: 115-118. doi:10.1016/j.resp.2008.10.014

Author Thamrin, Cindy
Albu, Gergely
Sly, Peter D.
Hantos, Zoltan
Title Negative impact of the noseclip on high-frequency respiratory impedance measurements
Journal name Respiratory Physiology & Neurobiology   Check publisher's open access policy
ISSN 1569-9048
Publication date 2009-01
Sub-type Article (original research)
DOI 10.1016/j.resp.2008.10.014
Volume 165
Issue 1
Start page 115
End page 118
Total pages 4
Place of publication Amsterdam, Netherlands
Publisher Elsevier
Language eng
Abstract The noseclip is conventionally used in lung function testing to prevent leakage via the nasal compartments. However, some subjects exhibit a velum-opening reflex which may affect results. We performed forced oscillation measurements at frequencies (8–256 Hz) that include the first antiresonance, comparing the noseclip with a cotton wool nose plug to eliminate upper airway contribution. Three sets of measurements were made in 18 adults: with and without noseclip, and with cotton wool. Velum opening during noseclip measurements was monitored using a nasal pressure transducer. A significantly greater proportion of subjects produced a characteristic distortion to the first antiresonance with the noseclip than with either no noseclip or with cotton wool. Distortion of the spectrum coincided with the transmission of oscillations into the nasal cavity. Thus, the noseclip cannot be used in high-frequency forced oscillation measurements because of the velum reflex. The cotton wool plug offers a simple alternative. This effect has unknown impact in other lung function tests.
Keyword Lung function tests
Forced oscillation technique
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: Faculty of Health and Behavioural Sciences -- Publications
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Citation counts: TR Web of Science Citation Count  Cited 2 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 17 Nov 2010, 11:53:25 EST