Forced oscillation technique and impulse oscillometry

摘要: Conventional methods of lung function testing provide measurements obtained during specific respiratory actions the subject. In contrast, forced oscillation technique (FOT) determines breathing mechanics by superimposing small external pressure signals on spontaneous FOT is indicated as a diagnostic method to obtain reliable differentiated tidal analysis. Because performed without closure valve connected to mouthpiece, and maximal or manoeuvres, it unlikely that itself will alter airways smooth muscle tone. FOT utilises applied their resultant flows determine mechanical parameters. These pressure–flow relationships are largely distinct from natural pattern individual flows, so measured results are, for most part, independent underlying pattern. Therefore, oscillometry minimises demands patient requires only passive cooperation subject: maintenance an airtight seal lips around mouthpiece normally through measuring system with nose-clip occluding nares. Potential applications include paediatric, adult geriatric populations, comprising clinical testing, monitoring therapeutic regimens, epidemiological evaluations, severity disease. Oscillometry also applicable veterinary medicine. The last two main sections Relevance in practice and Oscillometry pulmonary laboratory emphasise aspects of application interpretation rather than methodological details and technological solutions, which discussed follow immediately below. Clinical application does not require mastery mathematical infrastructure technical methodology, readers interested use of FOT may find more useful begin these refer subsequently technological details.