The therapeutical solutions for respiratory mucosa such as some thermal spring water must be perfectly tolerated and it is presently accepted that one of the best criteria of tolerance is the maintenance of a normal ciliary function. The photo-oscillographic techniques developed by the authors enabled the measurement of the physiological frequency of ciliary beat in vitro, and of the effect, either stimulant or inhibiting, of the thermal spring water. The measurement is done either in liquid phase by immersion of a fragment of ciliated mucosa, or in gas phase by aerosolization. At the same time it is possible to control in man the effects of thermal spring aerosols on the mucocilliary drainage by a simple technique.
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