Objective To discuss the value of MRI in clinical diagnosis.Methods Images between CR excretory urography and MRU were compared,which came from the results of 36 cases who were examined by both CR and MRU.Results The spiral MRU images were better than those of the CR excretory urography,and at the same time,the relationship between the parenchyma of the renal,renal pelvis,ureter,bladder and the urinary organs and adjacent tissues were displayed clearly.Conclusion The scanning time of MRI is shorter.The machine can not only reconstruct powerfully but also work out better images,and the result is better than MRI which can't detect pathological changes in detail in its images.Therefore MRI can be replaced by MRU if the higher cost can be afforded.[Chinese Medical Equipment Journal,2008,29(2):80-81]

Internet based problem-based learning (PBL) mode was used in teaching of ophthalmology in order to increase the quality of ophthalmology teaching and to raise the student's ability of problem solving.The method and requirements of teaching were discussed based on the teaching schema.Examples of cataract teaching using internet based PBL mode was performed.The characteristics and merit of the mode were summarized in the end.

Objective To explore the clinical application of two different fixation methods for nasal continuous positive airway pressure (NCPAP) in newborns. Methods One hundred and forty newborns who had NCPAP treatment were selected and divided into experimental group and control group with 70 cases in each group by random digits table method.The newborns in experimental group received self- made caps to fix the prong systems,while the newborns in control group received U shape towel. The incidence of nose, head of facial skin injury, frequency of detachment for nasal prongs and duration mechanical ventilation were compared between two groups. Results The frequency of detachment for nasal prongs per 24 h was (0.65±0.18) times in experimental group and (1.64±0.22) times in control group, and there was significant difference (t=28.68, P<0.01). The incidence of nose, head of facial skin injury were 8.6%(6/70), 2.9%(2/70) in experimental group and 27.1%(19/70), 14.3%(10/70) in control group,and there were significant differences ( χ2 =8.23, 5.83, P<0.01 or 0.05). There was no significant difference in duration mechanical ventilation between two groups(P>0.05). Conclusions Use of the self- made caps for NCPAP in newborns is associated with significant reduction in the incidence of nose, head of facial skin injury,and the frequency of detachment for nasal prongs.The fixation should be prompted in clinic.

Objective To evaluate the expression level of cathepsin D protein in nasopharyngeal carcinoma (NPC) and to determine its relationship with clinic pathological characters. Method Immunohistochemistry was performed to detect the expression of cathepsin D in 72 cases of primary NPC and 28 cases of normal nasopharyngal epithelial tissue ( NNET), and the correlation of its expression level with clinicopathologic features and clinical outcomes was evaluated. Results Significant down-regulation of cathepsin D was observed in NPC versus NNET(x2 = 13. 55, P ＜0. 01 ). In addition, cathepsin D down-regulation was significantly correlated with poor histological differentiation ( x2 =41.47, P ＜0. 01 ). Type Ⅰ and Ⅱ (well-moderately differentiated) NPC showed more intense immunoreactivity of cathepsin D compared with type Ⅲ (poorly differentiated) NPC. Cathepsin D up-regulation was significantly correlated with clinical stage, recurrence, and lymph node and distant metastasis (x2 = 13.43,22. 86,21.61,14. 32, P ＜0. 01 ).Tumors with cathepsin D up-regulation tended to have advanced clinical stage, frequent recurrences, and metastasis to lymph node and distant organ. Conclusion The expression of cathepsin D was closely related with the differentiation, clinical stage and pathological grade of NPC. Cathepsin D could be served as an effective differentiation marker for the histopathological grading of NPC and a possible therapy target.

Objective:To study the pupils' anxiety and related factors.Methods:6994 pupils and their were investigated using Conners Behavior Checklist(PSQ).Results:The pupils above 8 years old were more anxious.The economic state of family played an important role in pupils' anxious.Their existed significant age difference in boys but not in girls.Level of farther's and mother's education has obvious influences in their anxiety.Conclusion:The effect facts of anxiety include the age of students,economic state of family,the level of parent's education.

Objective To explore the effects of the meteorologic factors on air pollutants and to establish a model of relationship between the meteorologic factors and concentration of air pollutants. Method The data of SO2,NO2 and PM10 concentration in the air and the related meteorologic factors (daily average,maximum and minimum atmospheric pressure and daily atmospheric pressure difference,daily average,maximum and minimum air temperature,monthly rainfall,daily average and minimum relative humidity and wind speed) from January 2002 to December 2007 were collected. The correlation between the air pollutant levels and related meteorologic factors was analyzed by the multiple regression models with SPSS 11.5 software and multiple regression equations were established. Results Minimum relative humidity was negatively correlated with the concentration of SO2 and NO2 in atmosphere . Daily minimum air temperature was negatively correlated with the concentration of NO2 in atmosphere. Daily average relative humidity and wind speed were negatively correlated with the concentration of PM10 in atmosphere. Daily atmospheric pressure difference was positively correlated with the concentration of PM10 in atmosphere. Multiple regression equations of the concentration of SO2,NO2 and PM10 in atmosphere and meteorologic factors have statistical significances. Conclusion The meteorologic factors have some effects on the air pollution levels. By using the correlation of meteorologic factors and the concentration of air pollutions,multiple regression equations can be established.

Objective To analyze time-space variation of air pollutants(SO2,NO2,PM10) and the correlation among them in inner region and outer region of Shenzhen from 2002 to 2007.Methods The daily concentration means of SO2,NO2 and PM10 during 2002 to 2007 from the nine environmental monitoring sites in Shenzhen were collected.The determination was conducted according to the Ambient Air Quality Criteria.Results From January to December,variation of air concentration of SO2,NO2 and PM10 met the "V" shape in inner region and outer region of Shenzhen in 2002-2007,which was descending from January to June and ascending from June to December.The level of the air pollutants in inner region and outer region was higher in fall and lower in summer.The air pollution level of the inner region was increasing from 2002 to 2004,then decreased in 2005,but increased again in 2006 and 2007.The tendency of the outer region was similar with the tendency of the inner region from 2002 to 2006,but the level of pollutants decreased in 2007.The air concentration of SO2 in outer region was higher than that in inner region in 2002-2007.The air concentration of NO2 and PM10 in outer region was higher than that in inner region in 2002 to 2006,but lower in 2007.The air concentration of SO2 in inner region and outer region in 2002-2007 was under the limit of grade 2 according to the GB 3095-1996,near to grade 1 in inner region.The air concentration of NO2 and PM10 was under the limit of grade 3 and grade 2 respectively.There was a close correlation among the levels of SO2,NO2,PM10 in Shenzhen.Conclusion The air quality in Shenzhen is better in China.The time-space variation of the air pollutants is obvious and a close correlation exists among the air pollutants.

Objective to investigate the characteristics of externalizing problems behavior and related factors in new generation migrant workers so as to provide a decision making basis for consensus propaganda,psychological assistance and intervention.Methods A total of 1 340 new generation migrant workers(male 862,femal 478) were extracted from the gathering areas of mi grant workers in the three cities of Chongqing,Shenzhen and Hangzhou,the questionnaire survey and evaluation were performed by adopting the Youth Self-Report (YSR),Harter Self-Perception Profile(HSPP),Lum Emotional Availability of Parents (LEAP),Perceived Availability of Social Support Questionnaire(PASSQ) and Psychological Acculturation Scale(PAS).Results The tested externalizing problems were slightly higher than the non-clinical tested reasonable scoring range,the peer support had statistical difference between sexes(P＜ 0.01),the personal ability and comprehensive self value had significantly positive correlation (P ＜ 0.01),and both were negatively correlated to the externalizing behavior problems(P＜0.01),parents' emotional availability and support showed significantly negative correlation to externalizing behavior problems(P＜0.01),the working environment support was negatively related to externalizing behavior problems(P＜0.05).The prediction of personal effectiveness to externalizing prob lems behavior was obvious(P＜0.01),the social acceptance(P＜0.01) and overall self value(P＜0.01)were the predictive factors of externalizing problems behavior,and the work environmental support had the predictive effect on externalizing problems behavior (P＜0.05).Conclusion Personal ability,parents' emotional availability and support,work environmental support and social acceptance are correlated with externalizing behavior problems in new generation migrant workers.The overall self value,social accept ance,mother's emotional availability and parents' emotional support have significant prediction,while the work environmental support has a predictive effect on externalizing behavior problems.

Objective To analyse the prognostic value of serumal copeptin in patients with acute exacerbation of COPD compli-cated withrespiratory failure.Methods The serumal copeptin were detected in 60 hospitalized AECOPD patients before and after the treatment and in 30 healthy controls.Results Comparing with control groups,the serumal levels was significantly elevated in the patient with AECOPD before thetreatment and declinied two months later(P <0.05).The level of serum copeptin wereincreasing with the increase in the severity of the disease in acertain extent;The serumalcopeptin were positively correlated with lung function and CAT (r=0.058 and 0.821,P =0.00)and were negativelycorrelated with 6MWD(r=-0.652,P =0.00).Conclusion Serum copeptin could as-sess the incidence of acute exacerbations ofchronic obstructive pulmonary disease and its therapeutic effect;Serum copeptin can reflect the se-verity of AECOPD patients in a certain extent,and has certain clinical value to evaluate the quality of life in patients.

Objective To explore the application of integrating 64-slice CT image with three-dimensional electroanatomic mapping(Carto-Merge) in guiding catheter ablation of atrial fibrillation(AF).Methods Fifteen patients with drug-refractory AF received catheter ablation of AF.64-slice CT scan was performee 1-3 days prior to the ablation procedures.Using a novel software package,the left atrium(LA)with PVs was segmented and extracted for image registration with a combination of landmark registration and surface registration.Results The integration of the CT image into the electroanatomic mapping system was performed successfully in all patients with an error of 2.11?0.82 mm.Thirty pairs of PVs were electrically isolated after circumferential rediogrequency pulmorary rein ablation.The mean procedure time was 170.51?38.47 minutes.Cardiac tamponade occurred in one patient.All the fifteen patients were free of AF recurrence after 3 months of follow up including the 2 cases of persistent AF who required antiarrhythmic drugs.No thromboembolic events or stenosis were observed.Conclusion Integration of 64-slice CT image into the CARTO system successfully performed in patients undergoing catheter ablation of AF and enhance the ablation success rate.