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.
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.