Objective To study the relevant factors and prevention of X-ray missed diagnosis in rib fracture.Methods 28 cases of rib fracture in the X-ray missed diagnosis were retrospectively reviewed. The relevant factors and preventive question of X-ray missed diagnosis were explored.Results Careless reading of film(n=3),wrong position of taking film(n=7),film of low quality(n=4),image of rib fracture concealed by other image (n=11) and improper time of taking film(n=3) were found as the cause of missed diagnosis.Conclusions The X-ray examination of chest is the most practical method in diagnosing rib fracture. The choice of position in taking film,quality assurance of film,the right time in taking film and carefulness in reading film may affect the diagnosis of rib fracture.

Objective To investigate the value of Computed Tomography Myelography(CTM) and CT in diagnosis of in intravertebral tumors.Methods 35 tumors in the canales spinalis examined by CTM and CT and confirmed by surgical-pathologic results were retrospectively analyzed.Results 10 intramedullary(28 6%),15 intradural extramedullary(42 9%) ,8 intradural(22 9%) and 2 intra-extradural tumors(5 7%) were diagnosed respectively by CTM and CT.Conclusion CTM and plain and enhancement CT scanning can reveal the features of every kind of tumors in the canales spinalis and determine correctly respective position and nature.

Objective To study the radiographic findings of the chest in patients after open heart surgery and its evaluating methods.Methods 236 cases after open heart surgery were divided into 3 groups according to the date of the first postoperative chest films:0～3 d,4～7 d and 8 d or more.The findings on pre and postoperative chest films were compared in 7 aspects respectively.Results 8 typses of complications were detected including severe ones such as acute pulmonary edema,the low cardiac output syndrome and ARDS.The incidences of widening of the mediastinum,pleural effusion and pulmonary interstitial edema were lower in over 8 d group than those in the other two groups(?

OBJECTIVE: To assess the influence of social support and self-efficacy on job burnout in sanitation workers. METHODS: A convenient sampling method was used to select 405 sanitation workers as study objects. The Maslach Burnout Inventory General Survey, Perceived Social Support Scale and General Self-Efficacy Scale were used to investigate the three dimensions of emotional exhaustion,cynicism and reduced personal accomplishment in job burnout, as well as the social support and self-efficacy. RESULTS: The cynicism was positively correlated with self-efficacy [partial correlation coefficient(r)=0.17, P<0.01]. Reduced personal accomplishment was negatively correlated with self-efficacy and social support respectively(r were-0.32 and-0.20, P<0.01). Hierarchical regression analysis indicated that the demographic variables can explain 30.4%, 29.9%, 22.0% of the three dimensions of sanitation workers′ emotional exhaustion, cynicism and reduced personal accomplishment respectively(P<0.01). After controlling for the demographic variables, self-efficacy could positively predict cynicism(P<0.01), the social support and self-efficacy could negatively predict reduced personal accomplishment(P<0.01). CONCLUSION: The institutional factor is the main reason affecting job burnout of sanitation workers. Cynicism is positively correlated with self-efficacy. Improving social support and self-efficacy can help alleviate the reduced personal accomplishment.