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Computer averaged nasal resistance

Volume: 27 - Issue: 1

Firstpage: 45 - Lastpage: 52

K. Naito - P. Cole - R. Chaban - D. Humphrey

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.

K. Naito - P. Cole - R. Chaban - D. Humphrey - Computer averaged nasal resistance
Rhinology 27-1: 45-52, 1989