过敏性鼻炎与外源性哮喘间的流行病学关系非常密切。有人发现外源性哮喘者78％合并有鼻过敏症状,而过敏性鼻炎者中38％有哮喘发作。已注意到过敏性鼻炎是发生哮喘的一种危险因素。作者回顾研究了一组患过敏性鼻炎的豚草过敏患者,以了解支气管对甲酰乙胆碱呈高反应性可否预测哮喘的发生。患者40例,女25,男15例,均是豚草过敏的过敏性鼻炎,平均随诊54(48～65)个月,平均年龄27.4(12～54)岁。开始时,40例中16例(40％)对甲酰 The epidemiology of allergic rhinitis and extrinsic asthma is very close. Some people found that 78% of extrinsic asthma with nasal allergy symptoms, and allergic rhinitis, 38% of asthma attacks. Allergic rhinitis has been noted as a risk factor for asthma. The authors looked at a group of ragweed allergy sufferers with allergic rhinitis to understand whether bronchial hyperresponsiveness to choline acetylide could predict the onset of asthma. There were 40 patients, 25 women and 15 men, all of them were allergic rhinitis with ragweed. The mean follow-up was 54 (48-65) months with a mean age of 27.4 (12-54) years. Initially, 16 of 40 (40%) were formyl