支气管哮喘是由嗜酸性粒细胞、肥大细胞和T淋巴细胞等多种炎性细胞参与的气道慢性炎症。这种炎症使易感者对各种激发因子具有气道高反应性。并可引起气道缩窄,表现为反复发作性的喘息、呼吸困难、胸闷或咳嗽等症状,轻者可自行或治疗后缓解。急性重度哮喘发作时患者有极度呼吸困难、紫绀、大汗淋漓、烦躁不安甚至意识模糊等,可出现呼吸衰竭,故急性重度哮喘是严重威胁患者生命的内科急重 Bronchial asthma is a chronic airway inflammation involving a variety of inflammatory cells such as eosinophils, mast cells and T lymphocytes. This inflammation makes susceptible persons have airway hyperresponsiveness to various stimuli. And can cause airway narrowing, manifested as recurrent wheezing, difficulty breathing, chest tightness or cough and other symptoms, the light can be relieved by themselves or after treatment. Patients with acute severe asthma attacks have extreme respiratory difficulties, cyanosis, sweating, irritability and even vague awareness, respiratory failure may occur, so acute severe asthma is a serious threat to the lives of patients with severe acute medical conditions