Abstract
The exhaled air of healthy people contains nitric oxide.Under the physiological condition, nasal nitric oxide(NNO) comes primarily from the sinuses, a little is produced in the nasal mucosa.Fractional exhaled nitric oxide is mainly from the trachea and bronchus.When airway diseases occur, it can influence the concentration of exhaled nitric oxide.Therefore, with the continuous improvement of technology in recent years, the measurement of NNO has been widely used in upper airway diseases of children.It is characteristics of quantitative, non-invasive, simple and safe.This article reviews the measurement methods of NNO and its clinical application in children upper airway diseases such as rhinitis, sinusitis, nasal polyps and adenoid hypertrophy. Key words: Exhaled nitric oxide; Upper airway disease; Child
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