Source: Annual Congress 2002 - Airway obstruction measurement (FOT - NEP) sleep and lung sound analysis
Disease area: Airway diseases

Abstract

Aim:To compare the respiratory impedances (Zrs) measured with a freeflow mouthpiece (FM) where the tongue is in a fixed position and a rubber mouthpiece (RM). Methods: Respiratory resistance (Rrs) and reactance (Xrs) were measured with a ROS-system (Sensor Medics®, Bilthoven) in patients referred for routine lung function testing. The patients were divided into group A with normal spirometry (10M:10F, 50±]15yrs, FEV₁= 97±]12 %pred) and group B with bronchial obstruction (15M:5F, 62±]12yrs, FEV₁= 58±]16%pred). In each subject 3 acceptable Zrs curves were obtained with FM and RM, in random order. Results: A decrease of the (extrapolated) Rrs at 0 Hz (R0) and of the average Rrs between 4-16 Hz (R4-16) was found for FM compared to RM (8% resp. 7% in both group A and group B). No effect on Xrs at 6 Hz (Xrs6) and the resonant frequency (F0) was found.

	Group A		Group B
	FM	RM	FM	RM
Rrs0 (hPa/l/s)	2.46 (0.65)***	2.72 (0.83)	4.47 (1.72)***	4.90 (1.88)
Rrs4-16 (hPa/l/s)	2.27 (0.54)**	2.48 (0.72)	3.40 (1.05)**	3.70 (1.16)
Xrs6 (hPa/l/s)	-0.56 (0.27)	-0.59 (0.31)	-2.07 (1.54)	-2.09 (1.46)
F0 (Hz)	8.7 (1.3)	8.8 (1.2)	17.7 (7.5)	17.0 (6.8)

Data are mean (SD).
**,***: significant difference between FM and RM, p<0.01, p<0.001, respectively.
The intra-individual coefficients of variation of Zrs obtained with FM and RM were comparable. Conclusion: The use of FM resulted in lower Rrs values compared to the conventionally used RM. The type of mouthpiece used did not affect Xrs and the reproducability of Rrs and Xrs. Therefore, when interpreting Rrs-data the type of mouthpiece should be taken into account.

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M. van der Burg, R. Aalbers, H. Groepenhoff, E. Oostveen (Groningen, Amsterdam, The Netherlands; Antwerp, Belgium). The type of mouthpiece used affects the respiratory resistance as obtained with the forced oscillation technique. Eur Respir J 2002; 20: Suppl. 38, 317

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