Hospital, Jilin Changchun 13002, 4 Basic Medical College of Jilin University, Changchun, Jilin 12 Revised: 2009: Chen Yun (957-) Male deputy chief physician, mainly engaged in occupational health protection and supervision. Correspondence author, professor. (VC), forced vital capacity (FVC), calculated first-second forced vital capacity) and final flow rate (fef73%) observed mean value of the above indicators decreased with the increase of contact time, and the abnormal rate increased with contact time. However, there was a trend of increasing and there was a statistically significant difference from the control group. Prompt contact with sulfur hexafluoride electrical equipment after-arc gas has a certain impact on the lung function of workers. 14:B sulfur hexafluoride (SF6) is a gaseous material, is a negatively charged, colorless, odorless, non-toxic inert gas, has good chemical stability, insulation and arc extinguishing, and has no oxidation And the advantages of strong electrical strength, etc., are widely used in electrical equipment. The relative density of sulfur hexafluoride gas is 6.16. After escape from the electrical switch, it can sink in the lower layer of the air. It is difficult to dilute and diffuse. 12. The SF6 gas itself is non-toxic, it is a simple intercalative gas, but it is connected to the electrical switch. At the instant of high-voltage current, many kinds of fluorides can be decomposed under the high temperature of the arc, such as HFSF4sf2, SF. These decomposed fluorides have different degrees of toxic effects on the respiratory tract. To this end, we observed the pulmonary function of workers exposed to SF6 electrical switches at substations. 1 Subjects and methods 1.1 Subject observation group Selecting substations engaged in the operation of sulfur hexafluoride electrical equipment and testing personnel with no history of smoking 53 persons, aged 28 to 53 years, mean age 385 years. Grouped according to the working age group, a group of working people >5 years, 13 people; 1 group of working years 5 to 9 years, 25 people; 111 group of working people> 10 years, 15 people. In the control group, 47 workers without smoking history who were exposed to sulfur hexafluoride in the substation were aged from 26 to 52 years with an average age of 378 years; all were male. 1.2 Measurement method The Shanghai F-80 single-barrel spirometer was used. According to the conventional method, the position was taken, and the vital capacity (VC) and the forced vital capacity (FVC) were calculated according to the forced vital capacity (FVC) to calculate the first second of forced vital capacity (FEV). FEV% and FEV%, maximum expiratory flow rate, final flow rate (FEF23% 75%), spirctural capacity percentage (VC%), and first-second forced expiratory volume as a percentage of predicted value (FEV%) ) and FEV/FVC% abnormal rate, forced expiratory middle and end flow rate abnormalities. 2 Results The data of each group were distributed in a normal manner by homogeneity of variance tests. The data of the four groups were tested for significant differences. The differences between the four observation groups and the control group were statistically significant (P005). Control group, 1, 1 There was a statistically significant difference between the fistula group and the first group (P<0.05), but there was a statistically significant difference between the control group, the first group, the first group, and the first group (P 85% abnormal number abnormal rate abnormal number abnormal rate abnormal number Abnormal rate abnormal number abnormal rate abnormal number abnormal rate control group 4736. The test results show that VCFEV, FEV/FVCFEF23%75%, ff75% have significant changes in the exposure to sulfur hexafluoride operation for more than 10 years, especially FEFfFEF% In the early period of contact, there was a noticeable change, which may be caused by the decomposition of sulfur hexafluoride into the lungs with the breath, chemical reactions with the respiratory mucosa and alveolar surface water, respiratory mucosa and alveolar damage, and decomposition of sulfur hexafluoride. The substance can be deposited in the deep part of the respiratory tract to cause destruction, damage, or fibrosis of the small airways and affect the ventilation function of the lungs. With the extension of the contact time, the pulmonary ventilation function can be further changed. This investigation shows that hexafluoro Indeed the art of sulfur pulmonary ventilation function contacting certain influence, particularly of small airways ventilation function primarily changes. Fef %% available fef %% and sulfur hexafluoride was determined as indices of pulmonary function of impact of early decomposition.
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