Respiratory responsiveness was measured by methacholine chloride bronchial provocation test in 163 new cotton workers before and after 10 weeks exposure to cotton dust. 为研究棉尘病发病机制,对163名棉纺厂新工人,于接尘10周前、后分别进行氯化乙烯甲胆碱支气管激发试验;
After 2 years, 70% of the patients had positive results of the bronchial methacholine chloride provocation. Methacholine chloride concentration was negatively related to hyperresponsiveness of bronchus. 2a后复查了乙酰甲胆碱激发试验70%为阳性,乙酰甲胆碱浓度与气道高反应性呈负相关;