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OBJECTIVE: To analyze the occupational hazard factors and their critical control points in the process of construction of a large-scale construction project.METHODS: The engineering analysis, worksite survey occupational health and occupational hazard factor testing were conducted in a large-scale construction project, and the results were analyzed. RESULTS: During the process of construction of this large-scale construction project, there were many occupational hazard factors such as silicon dust, welding smoke, wood and other dusts, inorganic compounds of manganese, carbon monoxide, carbon dioxide, nitric oxide, ozone, noise, high temperature, hand-transmitted vibration and ultraviolet irradiation, among them, silicon dust and noise were the most common ones. The over standard rates of exposure concentration of short term of total dust and respirable dust in the workplace were 68.2%(15/22) and 40.9%(9/22), and the over standard rates of exposure concentration of time weighted average were 54.5%(12/22) and 13.6%(3/22), respectively. The over standard rates of the noise intensity of area sampling and personal sampling in workplace were 69.2%(45/65) and 61.0%(25/41) respectively. The four hours energy equivalent frequency-weighted acceleration to vibration of three hand-transmitted vibration positions has been detected, and the result has surpassed the occupational exposure limit.The results of other occupational hazard factors such as high temperature, ultraviolet radiation, wood dust, welding smoke, other dust, manganese inorganic compounds, carbon monoxide, carbon dioxide, nitric oxide, nitrogen dioxide, hydrogen sulfide, hydrogen cyanide and ozone all met the occupational exposure limits. CONCLUSION: There are various occupational hazard factors in the process of construction of this large-scale construction project, among them, noise, dust and hand-transmitted vibration are the most prominent hazards.These hazards are the critical control points of this type of construction projects.
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OBJECTIVE: To establish a method for testing tetrahydrofuran( THF) in workplace air by solvent desorption gas chromatography. METHODS: The air samples were collected by activated carbon tube,desorbed with carbon disulfide solution,then separated by capillary column and detected by flame ionization detector. RESULTS: The linearity range of THF concentration was 1. 78-8 892. 00 mg / L,and the correlation coefficient was 0. 999 9. The minimum detection limit of THF was 0. 09 mg / m3. The minimum quantitative concentration was 0. 27 mg / m3( 3. 00 L air collection). The average desorption efficiency of THF was 94. 29%-96. 46% when placed overnight at the room temperature. The within-run and the between-run relative standard deviation were 0. 30%-0. 91% and 0. 66%-1. 23% respectively. THF sample could be stored at room temperature for at least 8 days. CONCLUSION: The method could be widely applied in sampling and detection of THF in workplace air.
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<p><b>OBJECTIVE</b>To analyze and summarize the characteristics and treatment of acute spinal cord decompression sickness. To explore the factors that influence the treatment effect.</p><p><b>METHODS</b>77 cases of acute spinal cord decompression sickness patients should be divided into 4 groups according to the pressurized treatment and drug treatment options. They were group I, group II, group III and group IV. At the same time they were get hyperbaric oxygen therapy and other treatment. The evaluation index, were Frankel function classification and paraplegia index. There were 17 factors that affected the treatment effect.</p><p><b>RESULTS</b>The rate of early cure was 57.14% (44/77). The rate of late cure was 74.03% (57/77). Their difference was statistically significant (P<0.05). In 3 months and 1 year the cure rate of group IV and group B were the highest. But there was no difference between them(P>0.05). They were higher than group ii and group I (P<0.05). The Frankel function classification in 3months and 1 year in each group was higher than before treatment (P<0.05). The paraplegia index in 3 months and 1 year in each group was lower than before treatment (P<0.05). In 3 months and 1 year the Frankel function classification was increased gradually and the paraplegia index was decreased gradually in group I , group II, group III (P<0.05). In group IV and group III the Frankel function and the paraplegia index had not significant difference (P>0.05). Among the 17 factors that affect the treatment effect there are 9 factors that affect the proportion of the large.</p><p><b>CONCLUSIONS</b>The first choice of treatment method for the patients with acute spinal cord decompression sickness would be group III. Drug therapy was also imporpant. At the same time the hyperbaric oxygen therapy and other treatments were taken. Although the cure rate was not high in this article. But most of the cure is within 3 months. Within 1 year.the cure rate still could be improved. 9 factors that affect the efficacy of acute spinal cord decompression sickness was more noteworthy.</p>
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Humanos , Doença da Descompressão , Terapêutica , Mergulho , Oxigenoterapia Hiperbárica , Paraplegia , Terapêutica , Medula EspinalRESUMO
Objective To observe the changes of CD11 a, CD11c and CD54 and its' influence on prognosis after the intervention of hyperbaric oxygen(HBO) in patients with acute cerebral infarction (ACI).Methods Sixty-four ACI patients were divided into control group( C group) and HBO therapy group( HBOT group).C group (33 cases) received routine treatment only, HBOT group ( 31 cases) received routine treatment and hyperbaric oxygen therapy.CD 11 a, CD11 c and CD54 were measured in both groups at ≤72h, the 7th d, 10th d, 12th d, 20th d after ACI, and neural functional damage scores(NDS) were evaluated at the same time.CD11a, CDllc and CD54 were also measured in normal control group (25 cases).Results Plasma levels of CD11a, CD11c and CD54 rose significantly both in HBOT group and C group and peaked at≤72 h after ACI, there was no significant difference between two groups (P > 0.05), then declined at the 7th d.Levels of CD11 a, and CD11c maintained at the peak for 7 d in H BOT group and for 10 d in C group.CD54 peak remained for 10 d in HBOT group, and for 12 d in C group.A correlation analysis and linear regression analysis showed that the NDS levels at 20th d (short-term curative effect), 6 months and 12 months (long-term outcome) could be explained by 97.3 % , 96.7% and 96.6% , respectively by the admission levels of CD11 a and/or CD11 c and/or CD54 and other related factors.Conclusion After hyperbaric oxygen therapy peak level duration of CD11a, CD11c and CD54 could be shortened.Hyperbaric oxygen could influence intercellular adhesion molecule changing process, reduce leukocytes adhesion, decrease expressions of CD11a CD11c and CD54, and protect ACI patients.Before treatment, expression of CD11a, CD11c and CD54 may predict the severity, short or long-term outcome and prognosis of ACI patients.
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<p><b>OBJECTIVE</b>To clinically characterize the divers who suffer from decompression sickness in group after diving, optimize therapeutic treatment settings for grouped patients where the conventional individualized treatment cannot be implemented.</p><p><b>METHODS</b>Clinical parameters of patients such as age, professional seniority in dive, labor intensity, diving depth and their symptoms were statistically categorized to identify the factors that correlate with treatment efficacy and recurrence rate. In accordance with the symptoms and the reactions to pressure, 4 treatment programs were applied: Program A, Program B, Program C, Program D.</p><p><b>RESULTS</b>(1) age, professional seniority, diving depth, length of service, dive frequency were positively correlated with the treatment efficacy (P<0.05, P<0.01), and these parameters together with pain intensity were also positively correlated with recurrence risk (P<0.05, P<0.01), while long latency time of the disease often related with poor therapeutic outcome and high recurrence rate (P<0.01), (2) pain intensity were positively affected by age, diving depth and dive frequency (P<0.05, P<0.01), whereas negatively affected by disease latency time (P<0.01), (3) Four elements in this clinic project, selection of treatment program, length of service, diving depth and disease latency time of patient, were responsible for (or: could account for) 48.0% change of treatment efficacy, (4) Among Programs using different therapeutic pressure, Program D, C and B had better outcomes than Program A (P<0.01, P<0.05). Also, less patients in Program D, C and B suffered from recurrence with relative to Program A (P<0.01, P<0.05), (5) Between Programs adopting same hyperbaric pressure and treatment duration time, Program D was more efficient and fewer recurrent cases were found in it if compared to Program B (P<0.05), (6) In programs with same pressure and duration time settings, Program D was remarkably superior to program C in regard of its treatment efficacy.</p><p><b>CONCLUSIONS</b>In condition with only limited clinic supplies, Program D could be the first choice to provide the hyperbaric oxygen as an ideal group treatment, and it is not very necessary for the clinician to provide individualized therapy. An appropriate extension of stay in hyperbaric chamber may apply to some patients but depending on the clinical symptoms, however, no longer time than 120 min is recommended.</p>