定义 呼吸道狭窄或移位称为阻塞。主要临床症状是呼吸困难。呼吸道阻塞有肺外、肺内原因,按阻塞部位分为上呼吸道阻塞和下呼吸道阻塞。 支气管痉挛的病因及发病机理 呼吸道阻塞的病因见表1。 表1 呼吸道阻塞的发病机理与原因 The definition of airway stenosis or displacement is called obstruction. The main clinical symptom is dyspnea. Respiratory obstruction outside the lungs, lungs, according to the obstruction of the upper airway obstruction and lower respiratory tract obstruction. The causes of bronchospasm and pathogenesis The causes of airway obstruction in Table 1. Table 1 respiratory pathogenesis and causes of obstruction