Humans ; Occupational Diseases ; diagnosis

Venous valve plays an important role in regulating the venous flow,especially in preventing the blood backflow.It has heen observed that when deep vein thrombosis and dissolved,the valves in the lesions had been destroied or dysfunction.The mechanism of damage of vein valve has not been fully clarified,but as we know,it's common that the inflammatory reaction,due to many unfavorable factors,can cause thrombosis.On the other hand,deep vein thrombosis could bring out the inflammatory reaction as well.So the author will review the development of researching of the destruction of venous valves in recent years.

Objective To investigate the effects of hyaluronan (HA) and CD44 on airway mucous hypersecretion,and explore the molecular mechanism of activation of epidermal growth factor(EGF)/epidermal growth factor receptor(EGFR) signal transduction pathway by signal factors. Methods BEAS-2 B airway epithelial cells were cultured in vitro,and were stimulated by neutrophil elastase(NE).Reactive oxygen species(ROS)scavenger(DMTU),hyaluronidase(Hase),CD44 antibody and tissue kallikrein(TK)inhibitor(PI)were served as interventional factors,and control group(serum free culture),NE stimulation group(50 nmol/L NE),DMTU+NE group(20μmol/L DMTU+50 nmol/L NE),DMTU+Hase+NE group(20 μmol/L DMTU+10μg/mL Hase+50 nmol/L NE),CD44Ab+NE group(5 μg/mL CD44Ab+50 nmol/LNE)and PI+NE group(1 00μg/mL PI+50 nmol/L NE)were established.The expression of mucin(MUC)5AC mRNA was detected by RT-PCR,the expression of MUC5AC and EGF protein was determined by ELISA,and the expression of phosphorylated epidermal growth factor receptor(p-EGFR)protein was analysed by Western blotting. Results The expression of MUC5AC,EGF and p-EGFR protein and MUC5AC mRNA in NE stimulation group was significantly higher than that in control group(P<0.01),the expression in DMTU+NE group was significantly lower than that in NE stimulation group(P<0.01),the expression in MTU+Hase+NE group was significantly higher than that in DMTU+NE group(P<0.05 for MUC5AC and p-EGFR protein and MUC5AC mRNA,and P<0.01 for EGF protein),the expression in CD44Ab+NE group and PI+NE group was significantly higher than that in NE stimulation group(P<0.05 for MUC5AC and p-EGFR protein and MUC5AC mRNA,and P<0.01 for EGF protein). Conclusion NE up-regulates the expression of MUC5AC gene via ROS/HA/CD44/TK/EGF/EGFR signal transduction pathway in airway epithelial cells.

OBJECTIVE: To discuss the biosafety and biocompatibility of biomaterials. METHODS: A computer-based online search of CNKI, CBM and VIP as well as manual search were performed to collect articles about random cell control experiments and animal experiments of biological material biocompatibility published between 1990 and 2008. A total of 28 Chinese literatures were collected, and 7 were included mainly involving the cytotoxicity test methods and blood compatibility of the experimental medium, experimental grouping, experimental materials, methods of observation, experimental results, and experimental conclusion. In addition, biocompatibility of the biological material was analyzed to summarize the biocompatibility of the biological safety. RESULTS: Based on experiments of biosafety and biocompatibility of biomaterials, the cytotoxicity test and blood compatibility of various biomaterials, such as collagen, chitosan, magnetic nanoparticle, metal vascular stent, sulphurated siliastic medical grade silicon rubber, polyurethane, ceramic coatings by micro-arc oxidation, are essential for the biological safety. The experimental results have shown that the biomaterials have good biocompatibility. CONCLUSION: A variety of biological materials present good biocompatibility, including collagen, chitosan, magnetic nanoparticle, metal vascular stent, sulphurated siliastic medical grade silicon rubber, polyurethane, ceramic coatings by micro-arc oxidation, based on the evaluation criteria.

Objective To investigate neural correlates of directed forgetting. Methods ERP was recorded from 12 healthy postgraduates while they performed a directed forgetting task based on the item-cueing method. During the study phase, each word was followed by a cue indicated that it need to be remembered, to be forgotten or just to be viewed. During the test phase, subjects were asked to make an old/new recognition response. One-way ANOVA of repeated-measurement and paired comparisons were carried out for the cue factor. Results Both of the accuracy and reaction time of the TBR group were significantly superior to those of the other two groups. No significant behavioral effect was found between the TBF group and the TBV group. In the study phase, statistical parametric mapping of ERP suggested the cue effects were presented in the frontal poles ( 200～300 ms ) and the parietal regions (300～400 ms) ,the left fronto-parietal and the right occipital region (450～700 ms). The difference between the TBF and the TBV was significant in the left parietal area (500～525 ms) and has the significant trend in the right frontal area ( 350～600 ms). In the retrieval phase, the old/new effects of ERP occurred in the left fro-nto-temporal (300～450 ms) for the TBF cue. Conclusions The TBF cue and the TBV cue have the equivalent behavioral performance. During the study period, the activation of the right frontal lobe and the left parietal suggests the active inhibition evoked by the TBF cue. And the TBR cue can enhance the rehearsal function of left hemisphere and improve the memory performance of words. The retrieval of the items of TBF is based on more familiarity and less recollection.

Objective To evaluate the value of DSA image mosaic in arteriography in lower extremities. Methods 22 suspected cases were examined by bolus chase, and then the images were mosaiced to a full picture after processing by Paste to judge the image effects of vessels. Results This method could display the whole image by one injection of contrast media. Vary lesions were found in the 22 cases. Conclusion This method can display the lower extremities lesions directly, which is better than traditional DSA.

Objective To compare the safety and efficiency of non -ionic monomer diagnostic opaque, iodixanol (Visipaque) and that of non -ionic disomer diagnostic opaque, iohexol (Omnipaque). Methods By comparing retrospectively the DSA opacification of 60 patients from 2006 to 2007, patients′ indispositions, adverse reactions and pictorial efficiency were recorded respectively. Results In the control group, iodixanol showed less indisposition caused by injection than iohexol and there′ s no obvious difference of indisposition. Both images met diagnostic requirements. Conclusion Both iodixanol and iohexol are safe, efficient and well -tolerant diagnostic opaque. Iodixanol is better than iohexol in indisposition caused by injection.

Objective To study Evaluation of serum soluble ST2 protein and brain natriuretic peptide(NT-proBNP)in patients with acute heart failure and prognosis of patients with acute heart failure.Methods Fifty cases patients with acute heart failure from April 2014 to April 2015 in the First Hospital of Traditional Chinese and Western Medicine of Beijing were researched.Detection of all patients with serum ST2,NT-proBNP,50 patients with acute heart failure were divided into heart failure group,50 healthy persons were selected as the control group.The control group and the observation group general heart failure data,the observation group and the control group of cardiac biomarker blood level,cardiac function level NT-proBNP blood concentration level,classification of cardiac function between ST2 blood concentration level were compared.Results Cr,BUN of heart failure group were higher than the control group,there was no significant difference between other indicators(P＞0.05).ST2((0.46±0.07)ng/L)in heart failure group was lower than the control group((0.66±0.20)ng/L),NT-proBNP((4160.20±57.49)ng/L)was higher than the control group((58.97±4.39)ng/L),heart function IV NT-proBNP blood concentration of the highest(9 428.29±75.93)ng/L,followed by grade III(1 921.01±30.27)ng/L,the second lowest(321.02±16.80)ng/L,(P＜0.01).Heart function IV level ST2 blood concentration was the highest(1.95±0.69)ng/L,followed by grade III(1.27±0.61)ng/L,class II minimum(0.78±0.24)ng/L(P＜0.01).Conclusion The serum ST2 and NT-proBNP are used to detect the patients with acute heart failure,can provide accurate diagnosis basis,has a very important value judgment on the classification and prognosis.

Objective To study the mechanism of respiratory tracts inflammation induced by the particles with an aerodynamic diameter of less than 10 ?m (PM10) and to observe the effect of high exposed group. Methods Particles were collected at kitchen, smoking-room, roadside and lake-side (the control group). Suspension of PM10 and rat models treated with PM10, kitchen oil smoke, cigarette smoke, road dust were established with a control group. On 22th day, the counts of total leukocyte and neutrophils in bronchoalveolar lavage fluid (BALF) and superoxide dismutase (SOD), glutathion peroxidase (GSH-Px), malondiadehyde (MDA), Cytokin-induced neutrophil chemotactics (CINC) in lung homogenate were measured and histopathological examinations were conducted on lung tissues. Results The counts of total leukocyte, macrophage and neutrophils in PM10-treat groups and the count of eosinophilia in road dust group increased significantly than those in control group (P

Objective To explore the recurrence-prevention effect of oral contraceptive and levonorgestrel-releasing intrauterine system (Mirena) after hysteroscopic endometrial polypectomy.Methods One hundred and seventy-four patients who received hysteroscopic endometrial polypectomy were enrolled in this research.The patients were informed and divided into three groups according to their selection:51 cases were given oral contraceptive since one month until 12 months after the surgery (oral contraceptive group); 60 cases were received Mirena since one month after the surgery (Mirena group) ; and 64 cases were received no treatment after the surgery (control group).The groups were followed up at 3,6,12 months after the surgery and compared the recurrence rate,menstruation,level of hemoglobin and complication rate.Results The recurrence rate in oral contraceptive group,Mirena group and control group was 3.9％(2/51),3.3％ (2/60) and 19.0％ (12/63),respectively.The recurrence rate in control group was higher than that in oral contraceptive group and Mirena group,and there was significant difference (P ＜ 0.05).The proportion of low menstruation volume in control group was lower than that in oral contraceptive group and Mirena group,and there was significant difference (P ＜ 0.05).The level of hemoglobin in control group was lower than that in oral contraceptive group and Mirena group [(124.55 ±9.33) g/L vs.(133.71 ± 11.03),(135.89 ±6.88) g/L],and there was significant difference (P ＜ 0.05).The incidence of complication in Mirena group [18.3％ (11/60)] was less than that in oral contraceptive group[35.3％(18/51)],and there was significant difference (P ＜ 0.05).Conclusions Oral contraceptive and Mirena after hysteroscopy for endometrial polys significantly decrease the recurrence rate.The complication rate of Mirena is lower and it is a safe and effective way to treat and prevent the endometrial polyp.