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对６７名Ⅱ、Ⅲ期矽肺患者做了肺功能（ＶＣ，ＦＶＣ，ＦＥＶ_１，ＦＥＶ_１／ＦＶＣ，ＭＶＶ，ＤＬＣＯ和血气分析（ＰａＯ_２，ＰａＣｏｇｍ_２，ｐＨ）。结果表明Ⅲ期矽肺肺功能较Ⅱ期矽肺降低，其中ＶＣ，ＦＶＣ，ＭＶＶ降低有显著差异，ＰａＯ_２和ｐＨ随矽肺期别增加呈降低有显著差异，ＰａＯ_２降低尤为明显，ＰａＣＯ_２呈增高趋势。肺功能与ＰａＯ_２改变显著相关，与ＰａＣｏ_２和ＰＨ无相关关系。ＰａＯ_２＜１０ｋＰａ发生率与尘肺劳动力鉴定肺功能损害评价结果一致。ＰａＯ_２＜１０ｋＰａ可以作为评价尘肺患者劳动能力的有价值的指标。
The lung function (VC, FVC, FEV_1, FEV_1 / FVC, MVV, DLCO and PaCO 2, PaCO 2, pH) of 67 patients with stage Ⅱ and Ⅲ silicosis was analyzed.The results showed that the stage Ⅲ pulmonary function was lower than that of stage Ⅱ silicosis , There was a significant difference between VC, FVC and MVV, PaO_2 and pH decreased significantly with the increase of silicosis stage, PaO_2 decreased significantly, PaCO_2 showed a trend of increase.Pulmonary function was significantly correlated with PaO_2 change but not with PaCo_2 and PH Relationship.PaO_2 <10kPa incidence of pneumoconiosis identified with the results of the evaluation of labor force consistent.PaO_2 <10kPa can be used as a valuable indicator of labor ability of patients with pneumoconiosis.