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The nasal resistance before and after reconstructive operation in 18 men with nasal obstruction was compared with that in 32 normal subjects. The nasal resistance was defined as difference between air way resistance through the nose and that through the mouth. The following findings were obtained:1) In cases of nasal obstruction, the airway resistance through both nostrils was 3.5 times as high as that through mouth before the operation. It was improved to 2 times as high as the latter after the operatian.2) In cases of nasal resistance was 2.5 times as high as the airway resistance through mouth before the operation. It was imprhved to 1 time as high as the latter after the operation.3) In normal cases, the airway resistance thaough both nostrils was 2 times as high as that through mouth, and 1 time as high as the nasal resistance.

[Standardization of nasal obstruction by the body plethysmograph method (cases of reconstructive operation of the nose) (author's transl)].