[Lung sound analysis of upper airway obstruction].
The frequency spectrum of stridor was studied by the computer program in the patients with upper airway obstruction. The results showed that the peak frequency of respiratory sound increased significantly, the frequency spectrum got wider and removed to the high frequency area above 200Hz, the E ratio was smaller than 1. These changes were more apparent during inspiration than those during expiration. It is concluded that the stridorous sound could be determined exactly and quantitatively, and differentiated from wheezing by the spectral analysis.
Shi
Y
Y
Department of Respiratory Medicine, General Hospital of Nanjing.
D000402:Airway Obstruction / Q000209:etiology / Q000503:physiopathology*; D003528:Carcinoma, Adenoid Cystic / Q000150:complications; D006801:Humans; D008080:Liposarcoma / Q000150:complications; D012135:Respiratory Sounds; D013057:Spectrum Analysis; D014134:Tracheal Neoplasms / Q000150:complications