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棉尘肺的早期症状特点是可逆性气道阻塞,即在休息日后第1天上工不久就出现胸闷气急,于第2天症状消失。随着病程进展,全部工作日甚至休息日都出现症状。但晚期的肺功能改变形式如何未定。作肯于1973年及1979年调查了383例45岁以上的棉纺工人,工龄至少3年,仍在工作或已退休。并于1972年及1978年调查年龄相当的居民277例作为对照。2组皆为自人。所用标准肺功能值系根据最大呼气流量曲线,
Early symptoms of cotton pneumoconiosis is characterized by reversible airway obstruction, that is, on the first day after the rest day, the worker developed chest tightness and shortness of breath, and the symptoms disappeared on the second day. As the course of the disease progresses, all work days or even days off have symptoms. However, how to determine the form of advanced lung function changes. In 1973 and 1979, 383 cotton-spinning workers over the age of 45 were surveyed, working for at least three years and still working or retired. And in 1972 and 1978 survey of 277 residents of comparable age as a control. Both groups are self-owned. The standard pulmonary function value used is based on the maximum expiratory flow curve,