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观察２５例喘息性支气管炎与支气管哮喘患儿尿亚硝酸盐（ＮＯ－２／ＮＯ－３）水平变化。结果：喘息性支气管炎与支气管哮喘患儿发病急性期尿ＮＯ－２／ＮＯ－３水平明显高于正常儿童（Ｐ＜０．０１）；喘息性支气管炎与支气管哮喘之间急性期、恢复期尿ＮＯ－２／ＮＯ－３水平均无显著差异（Ｐ＞０．０５）；末梢血中性粒细胞与尿ＮＯ－２／ＮＯ－３水平比较无相关性。提示：一氧化氮参与了喘息性支气管炎与支气管哮喘的炎症反应，在调节气道平滑肌张力方面起重要作用
The changes of urinary nitrite (NO-2 / NO-3) levels in 25 asthmatic bronchitis and bronchial asthmatic children were observed. Results: The levels of NO-2 / NO-3 in patients with asthmatic bronchitis and bronchial asthma were significantly higher than those in normal children (P <0.01). The acute and convalescent asthmatic bronchitis and bronchial asthma There was no significant difference in urinary NO-2 / NO-3 levels (P> 0.05). There was no correlation between peripheral blood neutrophils and urinary NO-2 / NO-3 levels. It is suggested that nitric oxide participates in the inflammatory reaction of asthmatic bronchitis and bronchial asthma and plays an important role in the regulation of airway smooth muscle tone