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Titolo:
Airway resistance measured by the interrupter technique: expiration or inspiration, mean or median?
Autore:
Bridge, PD; McKenzie, SA;
Indirizzi:
Royal London Hosp, Queen Elizabeth Childrens Serv, London E1 1BB, England Royal London Hosp London England E1 1BB ens Serv, London E1 1BB, England
Titolo Testata:
EUROPEAN RESPIRATORY JOURNAL
fascicolo: 3, volume: 17, anno: 2001,
pagine: 495 - 498
SICI:
0903-1936(200103)17:3<495:ARMBTI>2.0.ZU;2-6
Fonte:
ISI
Lingua:
ENG
Soggetto:
RESPIRATORY SYSTEM RESISTANCE; ASTHMATIC-CHILDREN; LUNG-FUNCTION; HEALTHY;
Keywords:
airway resistance; interrupter resistance;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: McKenzie, SA Royal London Hosp, Queen Elizabeth Childrens Serv, Whitechapel, London E1 1BB, England Royal London Hosp Whitechapel London England E1 1BB England
Citazione:
P.D. Bridge e S.A. McKenzie, "Airway resistance measured by the interrupter technique: expiration or inspiration, mean or median?", EUR RESP J, 17(3), 2001, pp. 495-498

Abstract

The measurement of airway resistance by the interrupter technique (Rint) needs standardization. Should measurements be made be during the expiratory or inspiratory phase of tidal breathing? In reported studies, the measurement of Rint has been calculated as the median or mean of a small number of values, is there an important difference? Subjects were 2.5-5.0 yrs (median 4.0 yrs) who had previous respiratory symptoms. The Rint in expiration (RintE) and inspiration (RintI) pre and postsalbutamol, the coefficient of variation (CV) of values contributing to measurements, and bronchodilator responsiveness(BDR) in both phases were compared. Measurements using median and mean were compared. RintE was higher than RintI by 4% (p <0.01). The CV of values making up RintE and RintI, and BDR measured in expiration and inspiration were similar. The median difference between means and medians of values making up measurements was 0.6% (range -6-11%). RintE has been shown to be consistently greater then RintI but the difference in this study is small. It is suggested that one or the other is chosenas the standard. In the present data the mean of a set of values contributing to a measurement was not significantly different from the median. However, the use of the median has been recommended since it is less affected bypossible outlying values such as might be included by fully automated equipment.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/04/20 alle ore 21:47:43