Abstract
Simulated nasal cavities with variously formed turbinates and different patency were ventilated by Harvard respirator. The effective cross sectional areas were assessed while the stroke volumes were changed from 300 to 700ml and the respiratory frequency from 10 to 50 times per minute.The estimated values of the effective cross sectional area were increased when the stroke volume and the frequency were increased. However, the increase was so small that it was not necessary to keep the stroke volume and frequency constant in estimation of the area. The sum of the value of each nasal cavity was greater than that of both cavities measured simultaneously. The data obtained in this study were analysed aerodynamically with special considerations for the air flow resistance of the nasal cavity and the apparatus.It was concluded that the effective cross sectional area was an expression of the nasal resistance and was not the same as the anatomical area of the nasal passages, and that it could practically be applied during spontaneous breathing except too wide or too narrow nasal cavities.
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