Forced oscillation technique

Summary The forced oscillation technique (FOT) allows the characterisation of respiratorymechanics such as respiratory resistance (R rs ) and reactance (X rs ). The primaryadvantage of the FOT is that little active cooperation is needed from the subject andmeasurements are easily performed during tidal breathing with firm support of cheeksand mouth floor. Standards are available for equipment specifications and datacollection. Within-session variability should be documented, while between-sessionrepeatability is essential for the study of bronchomotor responses.Most clinically relevant information has been gained from R rs and/or X rs in thefrequency range 5–8 Hz, where R rs is mostly dependent on frictional losses in theairways and X rs is determined in great part by elastic respiratory properties. There hasbeen an increasing number of paediatric reports during the past decade, particularlyin uncooperative young children. Case–control studies have reported lung functionabnormalities in young children in chronic lung disease of prematurity, with lessconsistent data in cystic fibrosis. Findings in children with stable asthma appeardependent on inclusion criteria, with more abnormalities detected with recruitmentfrom asthma clinics than in field studies. Longitudinal studies in asthmatic childrenover weeks to months suggest the FOT and in particular X

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