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

Abstract

The popularity of forced oscillation technique has grown for several years. Commercial measurement systems use pseudorandom sinusoidal signal (Pulmosfor, SEFAM, France and ROS,SensorMedics, USA) or new method of rectangular impulses (IOS, JAEGER, Germany). The main goal of this study was to compare results obtained from Pulmosfor, ROS and IOS systems. In 30 patients (16 female and 14 male, age 23.0 ±]12.04) we have measured respiratory resistance at 5 Hz and 10 Hz and 20 Hz at least three times. Data analysis consisted of calculating regression and dispersions from the line of identity, over means according to the method of Bland and Altman (BA). Results are given in the table. Those results suggests that results of measurements obtained from Pulmofor and ROS are comparable and differences are small and random. Results from IOS differs from results from Pulmosfor and ROS and difference depends on measured value (f=10Hz) so they are not strictly comparable. It seems, that predicted values for sinusoidal measurements do not apply for impulse oscilometry.

S1		S2	f [Hz]	r	difference mean±] SD	r for BA graph	slope
Pulmosfor		ROS	5	0.91**	0.29±] 0.52	-0.0014 (NS)	--
Pulmosfor		ROS	10	0.91**	0.17±]0.37	-0.26 (NS)	--
Pulmosfor		IOS	5	0.81**	0.34±]0.85	0.20 (NS)	--
Pulmosfor		IOS	10	0.82**	0.25±]0.62	0.49**	0.35
ROS		IOS	5	0.87**	0.63±]0.72	0.23 (NS)	--
ROS		IOS	10	0.87**	0.42±]0.53	0.38*	0.21

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Citations should be made in the following way:
J. Radlinski, W. Tomalak, H. Mazurek, A. Pogorzelski, W. Myszkal (Rabka, Poland). Comparison of measuring systems used to evaluate input respiratory impedance by forced oscillation technique - pilot study. Eur Respir J 2002; 20: Suppl. 38, 318

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