支气管哮喘虽然是完全可以治疗的,但美国每年仍有4,000人以上死于此病。除非患者就诊过晚或治疗不够积极,否则目前的有效措施极少失败。从功能上看,哮喘的主要特征是气道阻塞,这可以轻至仅用敏感的试验才能测出,或重至有严重的呼吸困难,伴有呼气延长、呼吸音遥远、低氧血症、紫绀,有时还有二氧化碳 Although bronchial asthma is completely treatable, more than 4,000 Americans die each year from the disease. Unless the patient visits late or treatment is not positive enough, otherwise the current effective measures rarely fail. Functionally, the main characteristic of asthma is airway obstruction, which can be measured lightly to sensitive tests alone or to severe dyspnea with prolonged exhalation, distant respiratory sounds, hypoxemia , Cyanosis, and sometimes carbon dioxide