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Titolo:
ESTIMATION OF RANDOM ERRORS IN RESPIRATORY RESISTANCE AND REACTANCE MEASURED BY THE FORCED OSCILLATION TECHNIQUE
Autore:
FARRE R; ROTGER M; NAVAJAS D;
Indirizzi:
UNIV BARCELONA,FAC MED,LAB BIOFIS & BIOENGN,CASANOVAS 143 E-08036 BARCELONA SPAIN
Titolo Testata:
The European respiratory journal
fascicolo: 3, volume: 10, anno: 1997,
pagine: 685 - 689
SICI:
0903-1936(1997)10:3<685:EOREIR>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
HEAD GENERATOR; IMPEDANCE; MECHANICS; VENTILATION; MINIMIZE;
Keywords:
COHERENCE; FORCED OSCILLATION; IMPEDANCE ERRORS; RESPIRATORY RESISTANCE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
27
Recensione:
Indirizzi per estratti:
Citazione:
R. Farre et al., "ESTIMATION OF RANDOM ERRORS IN RESPIRATORY RESISTANCE AND REACTANCE MEASURED BY THE FORCED OSCILLATION TECHNIQUE", The European respiratory journal, 10(3), 1997, pp. 685-689

Abstract

The forced oscillation technique (FOT) allows the measurement of respiratory resistance (Rrs) and reactance (Xrs) and their associated coherence (gamma(2)). To avoid unreliable data, it is usual to reject Rrs and Xrs measurements with a gamma(2) <0.95. This procedure makes it difficult to obtain acceptable data at the lowest frequencies of interest. The aim of this study was to derive expressions to compute the random error of Rrs and Xrs from gamma(2) and the number (N) of data blocks involved in a FOT measurement. To this end, we developed theoreticalequations for the variances and covariances of the pressure and flow auto- and cross-spectra used to compute Rrs and Xrs. Random errors of Rrs and Xrs were found to depend on the values of Rn and Xrs, and to be proportional to ((1-gamma(2))/(2 . N .gamma(2)))(1/2). Reliable Rrs and Xrs data ran be obtained in measurements with low gamma(2) by enlarging the data recording (i.e. N). Therefore, the error equations derived may be useful to extend the frequency band of the forced oscillation technique to frequencies lower than usual, characterized by low coherence.

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Documento generato il 02/04/20 alle ore 12:50:00