To assess respiratory function, the tremoflo adds a gentle oscillatory wave to the patient’s regular, quiet breathing. A measurement duration of only 20 seconds allows three repetitions within a couple of minutes.
The tremoflo provides curves of Resistance (R) and Reactance (X) as well as parameters reflecting large and small airway function.
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An obstruction of the large, central airways causes a parallel upward shift in R while X remains largely unchanged.
Obstruction of the small airways in the peripheral lung causes a downward shift in X along with an increase in R. In presence of heterogeneities, R also becomes curved.
Dynamic collapse and expiratory flow limitation cause dramatic changes in X, especially during expiration.