Background and purpose:Parotid gland is rich in fat and has obvious contrast with bone and muscle in CT image.The preoperative examination of CT could help to evaluate the scale of tumor invasion and the relationship between tumor and normal tissues so that the proper therapy could be properly designed.The purpose of this study was to evaluate the roles of computer tomography(CT)in differential diagnosis of benign and malignant parotid tumors and to improve the diagnostic accuracy.Methods:CT images of 17 patients with benign parotid tumors and 15 patients with malignant parotid tumors proved by pathology were analyzed retrospectively.All patients underwent CT contrast-enhanced examination preoperatively.Images of all patients were retrospectively reviewed by two experienced radiologists in the diagnosis of head and neck tumors.Results:14 of 17 cases of benign tumors had round shapes and 9 of 15 cases of malignant tumors exhibited lobular or irregular masses(P

10.3969/j.issn.1000-3606.2013.06.024

Objective To construct the eukaryotic vector that expressing hepatitis B virus (HBV) S and the single fragment of variety chain (ScFv) of monoclonal antiboy against cytotoxic Tlymphocyte-associated antigen-4 (CTLA-4) and to analyze the immunological activity of recombinant S-ScFv protein.Methods The oringially constructed pSect2/ScFv4F10 and pSect2/S were double enzyme digested by Sfi I and Hind Ⅲ,respectively.Then the HBV S gene was cloned into the pSect2/ScFv4F10 vector.The pSect2/ScFv4F10 and pSect2/S-ScFv4F10 were expressed in Chinese hamster ovary (CHO) cells,and the expressed proteins were verified through sodium dodecyl sulfatepolyacrylamide gelelectrophoresis(SDS-PAGE)andWesternblotting.Afterultrafiltration concentration and affinity chromatography,the biological affinity of the expressed ScFv4F10 and S-ScFv4F10 proteins were examined by competitive enzyme-linked immunosorbent assay (ELISA) and surface plasmon resonance (SPR) technology.The comparison between groups was done by One-way ANOVA.ResultsThe eukaryotic expression vector of pSect2/S-ScFv4F10was successfully constructed,and relative molecular mass of the expressed protein of S-ScFv4 F10 was about 52 000 that analyzed by SDS-PAGE and Western blotting.With the fixed concentration of 4F10-mAb against CTLA-4,the A570 value of the mixed reaction with purified CTLA-4 antigen gradually increased with the decrease of ScFc fusion protein proportion; when the molar ratio of ScFv,S-ScFv4F10∶4F10=2∶1,the competitiveinhibitionratesagainst 4F10conjugatedantigenwere72.6％and64.5％,respectively.The affinity constants of association kinetics for CTLA-4 mAb,ScFv4F10 and S-ScFv4F10 with CTLA-4 antigen were 7.29 × 108 mol/L,9.52 × 106 mol/L and 2.04 × 106 mol/L,respectively,and the dissociation constants of KD were 1.40 × 10-9 mol/L,1.05 × 10-7 mol/L and 4.91 × 10-7 mol/L,respectively.ConclusionsThe eukaryotic expression vector of pSect2/S-ScFv4F10is successfully constructed,and the recombinant protein of S-ScFv4 F10 has a fairly high affinity with CTLA-4 antigen.

Objective To investigate the effects of downstream regulatory element antagonist modulator (DREAM) on the expression of glutamate transporter-1 (GLT-1) in spinal cord in rats with bone cancer pain and morphine tolerance.Methods Sixty female healthy Sprague-Dawley (SD) rats weighing 200 ～230 g were randomly divided into tow groups,group Ⅰ cancer pain (CP,n =48) and group Ⅱ Sham (S,n =12).Cancer pain in each group was produced by inoculation of syngenetic Walker 256 rat mammary gland carcinoma cells (5 × 105) to left tibia.Pain threshold to mechanical stimulus was measured before (baseline) and after the surgical procedure.From 14 d to 18 d after the inoculation of carcinoma cells,36 rats from group CP received subcutaneous injection of morphine at 3 times per day with doses increasingly from 10 mg/kg initially to 20 mg/kg,30 mg/kg,40 mg/kg,and 60 mg/kg.Equal volume of normal saline was applied to the 12 rats left in group CP.On 19th day after the carcinoma cells inoculation once subcutaneous injection of morphine at 3mg/kg was performed in all rats in group CP.From the next day,the rats in group CP ever receiving injections of morphine for 5 days were randomized into thre subgroups,including subgroups morphine tolerance (MT,n =12),vehicle (V,n =12),and RNAi (R,n =12).They were injected intrathecally with 20 μl of normal saline (NS),10 μl vehicle plus 10 μ1 NS,and 10 μ1 of DREAM-shRNA plus l0 μ1 NS,respectively,once a day for 5 days.Focusing on the affected limb,mechanical pain threshold was measured one day before surgery (T0),and at day7 (T1),day 14 (T2),day 18 (T3),day 19 (T4),day21 d (T5),day 25 (T6),and day 28 (T7) after surgery.The animals were sacrificed at day 28 after the procedure.The lumbar 4 segments in rats were removed for detection of DREAM and GLT-1.Results The mechanical threshold was significantly decreased at T1 compared to the baseline in all groups,returned to the baseline at T2 ～ T7 in group S,at T4 in group CP,and at T2 in group MT,V,and R,but remained low at T5 ～T7 in group CP,and at T3 ～T7 in group MT,V,and R.Compared to that at T1,it was decreased at T2 ～T3 and T5 ～ T7 in group CP,at T4 ～ T7 in group MT and V,and at T4 ～ T5 in group R,going back to the baseline at T4 in group CP and at T2 in group MT,V and R,and increased at T6 ～ T7 in group R.Compared to that in group S,the mechanical threshold in group CP,MT,V and R was decreased,and lower at T2 in group CP and at T4 in group MT,V and R.Compared to that in group CP,the mechanical threshold was significantly higher at T2 ～ T3 but lower at T4 in group MT,V,and R,decreased at T5 in group R and at T5 ～ T7 in group MT and V.The mechanical threshold was increased at T6 ～ T7 in group R and higher than that in groups MT and V.The expression of DREAM,compared to that in group S,was down-regulated in other groups.Compared to group CP,increment was shown in groups MT and V,and decrease was exhibited in group R.It was cut down in group R compared to that in groups MT and V.Compared to group S,GLT-1 was decreased in other groups.It was down-regulated in groups MT,V and R compared to group CP.Conclusions DREAM is involved in the development of allodynia after morphine tolerance in rats with bone cancer pain.No evidence in this study supports a link between DREAM and GLT-l in spinal cord.

Humans ; Industry ; Metals ; Occupational Injuries ; United States

Objective To evaluate reoperations for benign bile duct strictures after a prewousRoux-en-Y hepaticojejunostomy.Methods Clinical date of 28 patients with previous reconstruction of Roux-en-Y hepaticojejunostomy for benign bile duct strictures were retrospectively analyzed.For data staftstical analysis t-test and stepwise logistic regression analysis were used.Results Reoperative surgery was performed for residual biliary stones with bile duct stricture in 10 cases(35.7%),simple anastomotic stricture of hepaticojejunostomy in 11 cases(39.3%),remained biliary stricture after initial rear in 6 cases (21.4%).anastomotic leakage with duodenal leakage in one case(3.6%).Mode of reoperation:18 cases (64.3%)underwent hepatic lobectomy with Roux-en-Y hepaticojejunostomy,liver splitting approach to Roux-en-Y hepaticojejunostomy in 5 cases(17.9%),right hemihepatectomy in one case(3.6%),resection of anastomotic stenosis involved segment and Roux-en-Y hepaticojejunostomy in one case(3.6%),abdominal drainage and duodenum fistulization and jejunum ostomy in one case(3.6%),choledocholithotomy with T-tube drainage in 2 cases(7.1%);Thirteen patients(46.4%)developed postoperative complications.Conclusion Biliary tract stenosis remains the main cause for reoperation in patients undergoing a faeled reconstruction.Wide and patent biliary tract drainage and reconstruction somenmes necessitate a hepatic lobectomy.

Objective To study the effect of mesylate ropivacaine programmed intermittent epidural injection for labor analgesia. Method 100 cases of ASA I or II single cephalic term primiparae , randomly divided into epidural rules intermittent administration group (Group A) and continuous epidural infusion group (Group B), 50 cases of each group. Two groups were treated with 0.12%mesylate ropivacaine and 2 μg/mL fentanyl. The two groups were observed in different stage of labor , uterine contraction analgesic effect , mode of delivery , fetal distress and neonatal asphyxia. Result Compared with Group B, the VAS scores of women in Group A were decreased significantly and the difference was statistically significant (P < 0.05) after they had the labor analgesia 60min later, the mouth of the uterus opened to 5-6cm and all. There is no statistical significance in the mode of delivery and Apgar score. Conclusion Ropicacaine mesilate epidural programmed intermittent bolus are safe and effective for labor analgesia. Compared with continuous epidural infusion analgesia in labor , maternal satisfaction is higher and there is no significant adverse effects on mother and infant.

Objective:To explore the changes of saliva urea, creatinine (Cr), and uric acid (UA) before and after hemodialysis in patients with end-stage renal disease (ESRD), and to evaluate the clearing effect of Urea, Cr, and UA.
Methods:Saliva and serum (2 mL) were collected from the dialysis patients. The concentrations of Urea, Cr, and UA in both samples were measured by biochemical analyzer. The concentrations of Urea, Cr, and UA in the saliva and the serum, and their correlation were analyzed. Before and after the hemodialysis, the reduction ratio (RR) of Urea, Cr, and UA in the saliva and the serum was calculated.
Results:In ESRD dialysis patients, the levels of Urea, Cr, and UA in the saliva and the serum were highly correlated (correlation coeffcients were 0.979, 0.973, and 0.948, respectively). The concentrations of Urea, Cr, and UA in the saliva and the serum before the dialysis were lower than those after the dialysis, with signiifcant difference (P<0.05). The RR of Urea, Cr, and UA in the saliva and the serum did not differ statistically (P>0.05).
Conclusion:The clearing effect of salivar Urea, Cr, and UA is similar to that of the serum. Saliva is expected to replace the serum to evaluate hemodialysis efficacy and monitor the renal disease in ESRD patients.

Objective To investigate current status and problems of coagulation factor Ⅷ and Ⅸ assay in domestic laboratories so as to provide the reference for implementing the standardization and quality improvement.Methods A questionnaire survey was carried out in 76 laboratories,and quality control materials were distributed to 54 laboratories for activity assay.The questionnaire information was analyzed statistically.Test results of quality control materials were classified into three groups according to the reagents and the ranked grading analysis were used to evaluate the performance.Results This research was investigative study.The amount of sample was less than 30 per month in 72％ (52/72)of laboratories.The frequencies of calibration were different,and 33％ (24/72) of laboratories did not perform calibration in a different assay batch.39％ (28/72)of laboratories did not run internal quality control,and about 21％ (15/ 72) of laboratories just performed the normal level quality control.Individual laboratories showed a high cumulative CV (＞ 30％) of intemal quality control.For normal FⅧ and FⅨ control materials,the CV of results were 11.3％-18.2％ and 11.3％-17.9％ respectively as well as 15.3％-20.3％ and 19.5％-21％ for abnormal.Of the three groups,the proportions of laboratories which the FⅧ test results out with consensus were18％,24％ and 22％ as well as 20％,24％ and 28％ for FⅨ.Conclusions The key requirements for quality control of coagulation factors active assay remain to be addressed and implemented.The repeatability and comparability in some laboratories are not satisfactory to meet the clinical needs.With the purpose of promoting quality improvement,we need to develop guidelines,organize related training and establish a national external quality assessment scheme.

Objective To investigate the effects of different types of anesthesia on the incidence rates of low-er respiratory tract infections of elderly patients in orthopedic department.Methods Clinical data from 445 elderly patients in orthopedic department were collected and retrospectively analyzed.We also investigated the relationship be-tween the types of anesthesia and the lower respiratory tract infections.Results The incidence rates of lower respira-tory tract infections were 23.08%in 169 cases,12.14%in 173 cases,and 4.85%in 103 cases after general anesthe-sia with tracheal intubation,intraspinal anesthesia,and nerve blocking anesthesia,respectively.There was statistically significant difference in the infection rates among the three groups (χ2 =13.784,P=0.001).Conclusion Different ways of anesthesia is critically correlated with the incidence of the lower respiratory tract infections in elderly patients.