Objecfive To identify what factors contribute to the occurrence of avascular necrosis (AVN) of the femoral head after pediatric femoral neck fractures. Methods A series of 33 pediatric femoral neck fractures who had been admitted to our institution between June 1994 and April 2006 were retrospectively reviewed. There were 1 case of type Ⅰ,15 type Ⅱ,14 type Ⅲ and 2 type IV according to Delbet classification. The mean age at injury was 10.7(3.7 to 14.1) years, and the mean follow-up was 3.4(1 to 12.2)years. All patients were followed up until union was achieved. AVN occurred in 16 cases, including 8 cases of Ratliff type Ⅰ,3 of Ratliff type Ⅱ,4 of Ratliff type Ⅲ and 1 unclassified. Age at injury, fracture type, degree of displacement, quality of reduction and type of fixation were calculated and analyzed with respect to AVN. Results AVN occurred in 4 cases (36.4%)under 10 years old and in 12 cases (54.5%)10 years old or more. Eight cases (53.3%)of AVN occurred in Delbet type Ⅱ and 6 cases (42.9%) of AVN occurred in type Ⅲ.One case (25.0%)of AVN occurred in non-displaced group and 14 cases(53.8%)in displaced group. Ten cases(50.O%)of AVN occurred in the group whose reduction quality was satisfactory and 6 cases(66.7%)in unsatisfactory reduction group. Thirteen cases (48.1%)of AVN occurred in the unstable fixation group and 2 cases (50.0%)in the stable fixation group. Conclusion Fracture type, degree of displacement, quality of reduction and age at injury can affect the occurrence of AVN of the femoral head after pediatric femoral neck fractures.

Background and purpose:Correct target positioning is an important factor affecting the precision of stereotactic body radiotherapy (SBRT) in patients with lung tumors. This study investigated the setup errors in patients with malignant lung tumors receiving SBRT with cone-beam CT (CBCT) and analyzed the factors influencing setup errors.Methods:Twenty-nine patients with solitary malignant lung tumors were enrolled in the study. Each patient underwent SBRT with CBCT before each treatment. Setup errors in CBCT were obtained according to the matched and planned CT images in anterior-posterior (AP), superior-inferior (SI) and left-right (LR) directions. The expanding margins of clinical target volume (CTV) to planning target volume (PTV) according to the analyzed setup errors were then calculated. And the influencing factors of setup errors were analyzed.Results:A total of 155 CBCT images from 29 patients were obtained during the treatment. The setup errors were (-1.68±3.62), (-1.34±3.90) and (0.36±2.15) mm in the AP, SI and LR directions, respectively. The absolute setup errors were (3.16±2.42), (3.29±2.48) and (1.74±1.30) mm in the AP, SI and LR directions, respectively. The suggested expanding margins of CTV to PTV were 9.6, 10.0 and 5.3 mm in the AP, SI and LR directions according to the setup errors. The setup errors in the AP direction of peripheral lesions and in the SI direction of inferior, right and metastatic lesions were relatively larger(P=0.007, 0.008, 0.000 and 0.000)..Conclusion:In patients with malignant lung tumors receiving SBRT, the setup errors were more obvious in the SI and AP directions. Tumor motion management techniques including CBCT, breath-holding technique are required to reduce the setup error in patients with lung tumors receiving SBRT.

Objective To explore the status of lymph node dissection under thoracoscopic surgery and open surgery in patients with thoracic esophageal carcinoma. Methods 16 cases of thoracic esophageal cancer received thoracoscopic surgery from August 2012 to June 2015 as minimally invasive group (group M), 17 cases of thoracic esophageal cancer with the same pathological staging received traditional open surgery during the same period as control group (group C), the number of lymph nodes and the positive rate of lymph node metastasis were compared. Results In group M, the total number of 228 lymph nodes, mean (14.27 ± 5.61) pieces, the positive rate was 12.50%; while in group C, the total number of 241 lymph nodes, mean (16.20 ± 6.24) pieces, the positive rate was 11.76%. Two different pathological staging in patients with lymph nodes dissection has no significant difference ( >0.05). In group M, 7 cases with lymph node metastasis, 45 metastatic lymph nodes, metastasis rate was 43.75 %, 19.74 % degree of metastasis; while in group C, 8 cases with lymph node metastasis, 55 metastatic lymph nodes, metastasis rate was 47.06%, transfer degree was 22.82%.Conclusions Minimally invasive surgery can achieve the same effect with the traditional open chest surgery, in treatment of thoracic esophageal cancer with high operability.

Japan has accumulated much experience in medical education through a long time exploration.Through some reform measures,such as training talent physicians,reforming education systems,choosing core teaching courses,and establishing comprehensive education system,Japanese medical education has been well promoted,which will be helpful to our country's medical education reforms.

Objective To study the effect of compound hypertonic saline solution (HSD) on sepsis.Methods 133 male Wistar rats were divided into four groups,sham operation group (n =15),cecal ligation and puncture (CLP)group (n =45),CLP plus normal saline (NS) group (n =45),and CLP plus HSD group (n =28).A rat model of sepsis was reproduced by CLP,and the rats in sham operation group received celiotomy without ligation and puncture.All rats in four groups received subcutaneous injection of 30 mL/kg 0.9％ sodium chloride after laparotomy.The rats in CLP plus NS group and CLP plus HSD group received infusion of 5 mL/kg 0.9％ sodium chloride or 7.5％ sodium chloride/6％ dextran post CLP via jugular vein for 3 hours,with the infusion rate of 0.4 mL·kg-1·min-1.The survival rate of each group was observed 9 hours and 18 hours after laparotomy.Mean arterial pressure (MAP) at 0,9,18 hours were monitored.Blood specimens were collected from all rats 0,9 and 18 hours after laparotomy,respectively,for measurement of the plasma levels of tumor necrosis factor-α (TNF-α),interleukin-1β (IL-1β),and procalcitonin (PCT).The rats were all sacrificed,and their lung tissues were harvested for the neutrophil count in bronchoalveolar lavage fluid (BALF),myeloperoxidase (MPO) activity in lung tissue,wet/dry weight ratio (W/D) of lung,and pathological changes in lung tissue.Results There was no death in the sham operation group.The survival rates at 9 hours and 18 hours were 62.2％ and 31.1％ in the CLP group,57.8％ and 35.6％ in the CLP plus NS group,85.7％ and 64.3％ in the CLP plus HSD group,and they were all significantly higher compared with those of the CLP group and the CLP plus NS group (P ＜ 0.05 or P ＜ 0.01).MAP levels in the CLP group and the CLP plus NS group were significantly lower than those in sham operation group,and the plasma levels of TNF-α,IL-1β and PCT were significantly higher compared with those of sham operation group,while there was no difference between CLP group and the CLP plus NS group.MAP and the plasma levels of TNF-α,IL-1β and PCT in the CLP plus HSD group were significantly improved compared with those of the CLP plus NS group at 9 hours and 18 hours [MAP (mmHg,1 mmHg =0.133 kPa) at 9 hours:102±5 vs.94±6,18 hours:90±2 vs.72±3; TNF-α (ng/L) at 9 hours:284.19±57.18 vs.329.67±45.79,18 hours:263.46±42.58 vs.349.68±52.40; IL-1β (ng/L) at 9 hours:219.28±39.21 vs.263.47±32.36,18 hours:195.98±39.06 vs.250.10±41.57; PCT (μg/L) at 9 hours:2.32±0.37 vs.4.52±0.75,18 hours:2.89±0.62 vs.5.02±0.84; P ＜ 0.05 or P ＜ 0.01].The ratio of neutrophils in BALF,MPO activity and lung W/D at 18 hours in the CLP group and the CLP plus NS group were significantly higher than those of the sham operation group,while they were all significantly lower in the CLP plus HSD group than those of the CLP group and the CLP plus NS group [ratio of neutrophils in BALF:0.094±0.019 vs.0.148±0.062,0.151 ±0.055; MPO (U/g):1.19±0.45 vs.2.31 ±0.79,2.64±0.69; lung W/D ratio:4.02 ± 0.63 vs.5.14 ± 0.59,5.12 ± 0.83,all P ＜ 0.05].Under light microscope,no pathobiological changes were found in sham operation group.The lung tissues in the CLP group and the CLP plus NS group showed congestion,edema,infiltrating inflammatory changes,while the inflammatory changes in the lung tissue in the CLP plus HSD group were significantly alleviated.Conclusion HSD can obviously ameliorate the circulatory failure in septic rats,alleviate immune disturbance and acute lung injury,and improve the survival rate of rats with sepsis.

OBJECTIVE:To improve the system of management and maintenance for the purification air-conditioning system in PIVAS,and to further strengthen the management of cleaning environment. METHODS:The cleanness monitoring project of purifi-cation air-conditioning system in PIVAS of our hospital was introduced in terms of temperature and humidity record,pressure differ-ence record,airborne particles detection,settling microbe monitoring report. And the monitoring results were analyzed. RESULTS:The temperature and humidity,pressure difference of clean area in PIVAS of our hospital are both in line with the standard of Phar-macy Intravenous Admixture Quality Management Specification (2010 edition),i.e. temperature at 18-26 ℃,relative humidity of 40%-65%;negative pressure difference between antibiotics,hazardous drug dispensing area and second dressing room are 5-10 Pa. The number of airborne particles (average static particle/m3) at various cleanness degrees in clean area are all in line with the standard of GMP(2010 edition),i.e. maximal allowable number of airborne particles(≥0.5 μm)were 3 520/m3(100 degree);352 000/m3 (10 000 degree);3 520 000/m3 (100 000 degree). The percentage of qualified static settling microbe detection reach 100%in clean area,which is in line with the standard of Settling Microbe Detection Method in Clean Room(Area) of Pharmaceu-tical Industry,i.e. criteria for settling microbe(90 mm)CFU/0.5 h≤1(100 degree);≤3(10 000 degree);≤10(100 000 degree). The percentage of qualified dynamic settling microbe detection is in low level,especially those of dispensing room and secondary dressing room only reaches 80%. CONCLUSIONS:It’s important for effective hospital infection control in PIVAS,the quality im-provement of intravenous injection,the safety guarantee of drug use in patients to further improve standard operation procedure of purification air-conditioning system management and maintenance,and manage and maintain the purification air-conditioning sys-tem completely and scientifically.

Objective To investigate the feasibility and superiority of local anaesthesia video-assisted thoracoscopic surgery (LA-VATS) in diagnosis and treatment of open thoracic trauma (OTT).Methods Seventy-eight patients with OTT emergently admitted from February 2007 and June 2012 were randomized into LA-VATS group (n =37) and conventional treatment group (n =41) by the toss of a coin.In the LA-VATS group,further treatment was determined following LA-VATS.Volume of chest tube drainage,duration of chest tube placement,average length of hospital stay,and postoperative complications were measured and compared between groups.Results In the LA-VATS group,23 patients completed LA-VATS and 14 were transferred for simple VATS-assisted mini-thoracotomy under general anesthesia.In the conventional treatment group,24 cases completed debridement and chest drainage and 17 cases were transferred for thoracotomy under general anesthesia.Volume of chest tube drainage [(195.0 ± 150.8) ml/d∶ (480.0 ±212.3)ml/d] (t =-2.675,P ＜0.05),duration of chest tube placement [(2.6 ± 1.4) d∶ (3.8 ± 1.9) d] (t =-2.318,P ＜ 0.05),average length of hospital stay [(6.4 ±2.3) d ∶ (10.9 ± 3.3) d] (t =-2.471,P ＜ 0.05),and incidence rate of postoperative complications (10.8％ ∶22.0％) (x2 =4.132,P ＜0.05) were all significantly different between LA-VATS and conventional treatment groups.Conclusion LA-VATS is safe and feasible for diagnostic exploration and simple treatment of OTT.

Objective To summarize the experience in application of amputation of secondary structures of splenic pedicle and self-made spleen-removing bag in laparoscopic splenectomy the using 3-hole method. Methods The clinical data of 11 patients receiving the procedure from June 2007 to April 2009 in our hospital were retrospectively analyzed. Results Advantages of the procedure were less bleeding, small wound, quick recovery and no occurrence of postoperative complications. Six cases had slight postoperative pain. All 11 patients were cured. Conclusion The technique of amputation of secondary structures of splenic pedicle is safe and feasible in laparoscopic splenectomy using the 3-hole method.

Objective To observe the effect of MAP4K4 targeted shRNA on biological characteristics such as proliferation,invasiveness,and apoptosis in human bladder cancer cell.Methods Differentially expressed genes was screened out through cDNA microarray analysis in 5 pairs of fresh-frozen muscle-invasive bladder cancer(MIBC) and adjacent normal tissue obtained from radical cystectomy.Combining the results of genechip and literature review,MAP4K4 was picked up for further analysis.To verify the result of microarray analysis,16 pairs of fresh muscle-invasive bladder cancer (MIBC) and adjacent tissues were assessed for the expression of MAP4K4 mRNA and protein through RT-PCR,qRT-PCR and Western-blot.T24 cell line was stably trasfected with MAP4K4 targeted shRNA and control shRNA,respectively.The effects of MAP4K4 silencing on proliferation,invasiveness and apoptosis of T24 cells transfected with MAP4K4 targeted shRNA and control shRNA were assessed by 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT),transwell and flowcytometry (FCM) assay.Results MAP4K4 was overexpressed in muscle invasive bladder cancer than in normal tissue.Down regulation of MAP4K4 expression decreased bladder cancer cell proliferation(MAP4K4-targeted versus control,P＜0.001),invasiveness(MAP4K4-targeted versus control,P=0.004)and promoted cell apoptosis(MAP4K4-targeted versus control,P=0.023).Conclusions MAP4K4 is overexpressed in muscle invasive bladder cancer than in normal tissue.Down-regulation of MAP4K4 expression inhibits the invasive ability of bladder cancer.Therefore,MAP4K4 might be a potential therapeutic target for bladder cancer.

Objective:To explore the efifcacy and safety for radiofrequency catheter ablation (RFCA) of left bundle branch guided by left bundle potential (LBP), X-ray image with EnSiteNavX System in canine model.
Methods:The RFCA of left bundle branch was conducted in 13 dogs. A mapping catheter was positioned in right atrium to record right-sided His-bundle (R-His) potential, and an ablation catheter via right femoral artery was retrograded to left ventriclefor LBP mapping and ablation. Meanwhile, EnSiteNavX System was used to identify R-His, L-His and LBP at the same time. The potential characteristics in dogs with successful ablation were observed, the PR interval, QRS shape and time limit, AH interval, HV interval, the A/V electro-gram ratio in ablationcatheter at before and after ablation were recorded. The procedural time and X-ray exposure time between LBP with X-ray image method and LBP, X-ray image with EnSiteNavX System method were compared.
Results: There were 9/13 dogs received successful left bundle branch ablation, 3 dogs failed and 1 suffered from complete A-V block. At the successful ablation target site, the LBP-V was (17.8 ± 2.6) ms with the range of (13-21) ms, and the A/V electro-gram ratio<1/10. The procedural time and X-ray expose time were signiifcantly decreased in LBP, X-ray image with EnSiteNavX System method than those in LBP with X-ray image method P=0.007 and P<0.001.
Conclusion:Under the LBP, X-ray image with EnSiteNavX System guidance method, left bundle branch could be safely and effectively ablated to establish left bundle branch block (LBBB) model in experimental canine.