[A nasal cycle in healthy children].

A nasal cycle was studied in 10 healthy children (5 boys and 5 girls) aged 11-17 years (mean age 14.1+/-1.9 years). Registration of the nasal cycle was conducted for 7 hours by means of long-term nasal monitoring with Rhinocycle rhinoflowmeter (Interacoustics, Denmark). The nasal cycle was presented as a graphic image of fluctuations of a relative volumetric flux (RVF) in the relative units in accordance with linear dependence of pressure in the air flow to its volume. The nasal cycle in all healthy children was irregular, with mean fluctuation rate 1.3+/-0.6 h. There were no significant differences by RVF between the right and left parts of the nose in 8 children. In girls the nasal cycle most often was partially coinsiding, partially fluctuating while in most boys (in 4 of 5) the nasal cycle was irregular bilateral and fluctuating. It was found that the cycle was not longer or regular with the child's growth.