Objective To determine contact allergens and their clinical significance in patients with dermatitis or eczema in Wuxi city.MethodsPatch test was conducted in 1065 patients with a clinical diagnosis of dermatitis or eczema.A statistical analysis was carried out.Results Positive patch test reactions were observed in 83.19％ of the patients,with no statistical differences in the frequency of positive patch test reactions between female and male patients or between patients of different age groups.The most frequent 6 allergens were potassium dichromate,cobalt chloride,nickle sulfate,formaldehyde,carba mix and fragrance mix in these patients.Female patients showed a higher frequency of positive patch test reaction to nickle sulfate and formaldehyde,but a lower frequency to potassium dichromate and carba mix compared with male patients (all P＜ 0.01 ); young,middle-aged,and old patients exhibited an increased frequency of positive reaction to cobaly chloride compared with child patients,while young and middle-aged patients showed a decreased frequency to nickel sulfate compared with child patients (all P ＜ 0.05).Conclusion Potassium dichromate,cobalt chloride,nickle sulfate,formaldehyde,carba mix and fragrance mix are the main allergens causing dermatitis and eczema in Wuxi city.

Objective To observe the characteristics of different level of normal abdominal aorta’s time-flow,time-velocity curve and to investigate the hemodynamic factors in role of the occurrence and development of abdominal aorta’s disease.Methods PC-MRI scanning was performed on 60 normal volunteers T12/L1-L4/5 disc at the level of abdominal aorta,time-flow and time-veloci-ty curve were generated respectively.The characteristics of blood flow curves at different levels of abdominal aorta were observed. Results The time-flow,time-velocity curve of the normal abdominal aorta in different levels have 2nd phase (no diastolic reflux) and 3rd phase (diastolic reflux).Conclusion The characteristics of blood flow curves of different levels of abdominal aorta are dif-ferent.