毛细支气管炎是婴儿常见的一种下呼吸道感染性疾病,由不同病原引起,多见于1~6个月的婴儿,临床上以喘憋为主,病变主要发生在肺部的细小支气管,即毛细支气管,导致分泌物增加,支气管受炎症刺激痉挛,导致气道狭窄而堵塞,引起肺不张和肺气肿,患儿除有明显的喘憋外,还有鼻部症状,伴有呼吸困难,有明显的鼻扇及三凹征,脉搏增快,血氧饱和度下降,严重者出现心肺功能不全。临床 Bronchiolitis is a common infantile lower respiratory tract infection caused by different pathogens, more common in infants 1 to 6 months, clinically asthmatic, lesions mainly in the lungs of the small bronchus, the capillary Bronchial, leading to increased secretions, bronchial irritation spasm, leading to airway obstruction and congestion, causing atelectasis and emphysema, in addition to children with significant wheezing, there are nasal symptoms, accompanied by breathing difficulties, There are obvious nasal fan and three concave sign, pulse faster, decreased oxygen saturation, severe cardiopulmonary dysfunction. clinical