Objective: To explore the influence and significance of respiratory filter on the judgment of pulmonary function and the conclusion of occupational health examination in occupational health examination. Methods: From August to November 2020, 252 occupational health examinees were randomly selected as the research objects, and the lung function was examined with the respiratory filter bite and the straight cylinder bite without filter, respectively. The lung function examination indexes and the qualification rate of lung function examination were analyzed and compared between the two groups, and the diagnostic criteria of lung function examination was corrected. Results: 252 subjects were 36 (30, 42) years old. The qualified rate of lung function examination with respiratory filter bite (28.17%, 71/252) was lower than that with straight cylinder bite (34.92%, 88/252) , the difference was statistically significant (P<0.05) . The percentage of forced vital capacity in normal predicted value (FVC%) , percentage of forced expiratory volume in the first second in normal predicted value (FEV(1)%) , and percentage of forced expiratory volume in the first second in forced vital capacity (FEV(1)/FVC%) of subjects using respiratory filter bite were lower than those using the straight cylinder bite (P<0.05) . The corrected diagnostic criteria of pulmonary function were FVC%>78%, FEV(1)%>77%, FEV(1)/FVC%>68%. There was no significant difference between the qualified rate of the respiratory filter bite lung function test calculated according to the corrected diagnostic criteria (35.71%, 90/252) and the qualified rate of the straight cylinder bite lung function test calculated according to the original diagnostic criteria (34.92%, 88/252) (P>0.05) . Conclusion: In occupational health examination, the use of respiratory filter may affect the results of pulmonary function examination. The diagnostic criteria of pulmonary function can be corrected according to different filtering effects to ensure the accuracy of the conclusions of occupational health examination.
目的： 探讨在职业健康检查中使用呼吸过滤器对肺功能结果判定和职业健康检查结论的影响及意义。 方法： 于2020年8至11月，随机抽取252名职业健康检查受检者为研究对象，分别使用带呼吸过滤器的咬口和不带过滤器的直筒咬口进行肺功能检查，分析并比较两组肺功能检查指标和肺功能检查合格率，并对肺功能检查诊断标准进行校正。 结果： 252名研究对象年龄M（Q(1), Q(3)）为36（30，42）岁，使用呼吸过滤器咬口进行肺功能检查的合格率（28.17%，71/252）低于使用直筒咬口进行肺功能检查的合格率（34.92%，88/252），差异有统计学意义（P<0.05）。研究对象使用呼吸过滤器咬口检测的用力肺活量占正常预计值的百分比（FVC%）、第一秒用力呼气量占正常预计值的百分比（FEV(1)%）、第一秒用力呼气量占用力肺活量的百分比（FEV(1)/FVC%）均低于使用直筒咬口的检测值（P<0.05）。校正后的肺功能诊断标准为FVC%>78%、FEV(1)%>77%、FEV(1)/FVC%>68%。按校正后诊断标准计算使用呼吸过滤器咬口的肺功能检查合格率（35.71%，90/252）与原诊断标准计算使用直筒咬口肺功能检查合格率（34.92%，88/252）比较，差异无统计学意义（P>0.05）。 结论： 在职业健康检查工作中，使用呼吸过滤器可能会影响肺功能检查结果，可根据不同过滤效果对肺功能诊断标准进行校正，以保证职业健康检查结论的准确性。.
Keywords: Breathing filter; Lung function; Occupational health examination; Vital capacity.