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哮喘是一种气道的慢性炎症改变，具有气道高反应性、炎性细胞浸润及细胞因子或炎性介质释放增加等特点。Palmer等证实，能使血管平滑肌松弛的内皮舒张因子（＊＊R＊，其主成份是一氧化氮（NO）“‘。近年研究表明，NO参与人体内多种生理、病理过程，包括免疫调节和参与支气管炎
Asthma is an airway chronic inflammatory change with airway hyperresponsiveness, inflammatory cell infiltration and increased release of cytokines or inflammatory mediators. Palmer and other confirmed that relaxation of vascular smooth muscle relaxation of the endothelial relaxing factor (** R *, its main component is nitric oxide (NO). "Recent studies have shown that NO involved in a variety of physiological and pathological processes in the body, including immune regulation And participate in bronchitis