抄録
This study was done in order to determine how nasal obstruction, which can be regarded as a kind of upper airway stenosis, affects closing volume (CV).
Closing volume, measured with oral and nasal respiration, was compared in thirty-two adult patients. In addition, the percent vital capacity (% VC), percent forced expiratory volume (% FEV1.0), and flow-volume curves were compared.
The results were as follows:
1) When measured by means of oral and nasal respiration there was no significant difference in CV between the normal subjects group and nasal obstruction group.
2) When measured by means of nasal respiratory resistance (Rr), peak flow (PF), maximal expiratory flow at 75 percent (V75) and 50 percent (V50) showed a significant difference between the normal subjects group and nasal obstruction group. No significant was difference found, however, at 25 percent (V25).
