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A modified measurement of respiratory resistance by forced oscillation during normal breathing

par Stanescu, Dinu ;Fesler, Robert;Veriter, Claude;Fans, A.;Brasseur, Lucien L.A.
Référence Journal of applied physiology, 39, 2, page (305-311)
Publication Publié, 1975

Article révisé par les pairs

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Résumé :

The authors modified the measurement of the resistance of the respiratory system, Rrs, by the forced oscillation technique and developed equipment to automatically compute Rrs. Flow rate and mouth pressure are treated by selective averaging filters that remove the interference of the subject's respiratory flow on the imposed oscillations. The filtered mean Rrs represents a weighted ensemble average computed over both inspiration and expiration. This method avoids aberrant Rrs values, decreases the variability, and yields an unbiased mean Rrs. Rrs may be measured during slow or rapid spontaneous breathing, in normals and in obstructive patients, over a range of 3 to 9 Hz. A good reproducibility of Rrs at several days' interval was demonstrated. Frequency dependence of Rrs was found in patients with obstructive lung disease but not in healthy nonsmokers.