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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 E08036 BARCELONA SPAIN
 Titolo Testata:
 The European respiratory journal
fascicolo: 3,
volume: 10,
anno: 1997,
pagine: 685  689
 SICI:
 09031936(1997)10:3<685:EOREIR>2.0.ZU;2J
 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. 685689
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 crossspectra 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 ((1gamma(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.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 12:50:00