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Nasal resistances were measured before and after decongestion of the nasal mucosa

by posterior rhinomanometry with a head-out body plethysmograph in 95 adults

referred to our nasal airflow laboratory. These resistances were calculated by a time

averaging method (1), the equation R= (delta)P/V at (delta)P 1.0 cm H2O (2) and R= (delta)P/V at the point of peak flow (3), and the results were compared.

Correspondence between resistances from the time averaging method and those

from the equation R= (delta)P/V at A1.0 cm H20, the equation R= (delta)P/0.83V was

obtained with statistical significance (P smaller than 0.001) and it is suggested that the value of resistance from the time averaging method represents transitional airflow.

At resistances smaller than 3.5 cm H20/L/sec, the time averaging method and the equation

R= (delta)P/V at A1.0 cm H20 and at peak flow produced almost identical values.

At resistances greater than 3.5 cm 1120/L/sec, the time averaging method produced values

equivalent to those from the equation R= (delta)P/V at peak flow but values from the

equation R=(delta)P/V at (delta)P 1.0 cm H20 different from the former two methods.

The results suggest that nasal resistances from the time averaging method and the

equation R= (delta)P/V at the point of peakflow are appropriate expression of nasal patency.

Rhinology 27-1: 45-52, 1989