Methamphetamine is a powerful stimulant of amphetamine type in the central nervous system (CNS),and recently it has become the major drugs of abuse.A lot of research results show that MA may induce dopaminergic neurotoxicity in the animal and human striatum.The mechanisms include effects on dopaminergic signaling and dopamine oxidation,glutamate induced excitotoxicity,oxidative stress and inflammatory cytokines,disruption of mitochondfia,apoptosis,activation of glial cells and hyperthermia.However the mechanisms by the MA-induced dopaminergic neurotoxicity are not completely understood.The paper reviewed recent progress of study on them to provide reference materials for related research.

Objective To evaluate the efficacy of interventional catheter drainage combined with ozone therapy for the management of postoperative enterocutaneous fistula. Method A total of 70 patients with postoperative enterocutaneous fistula were enrolled and divided into group A (35, conventional surgical treatment) and group B (35, interventional catheter drainage and ozone therapy). Clinical efficiency, hospital stays, hospital expenses and complications were compared. Follow-up observations of the infection score in 2 groups before and after treatment (3 days, 1 week, 2 weeks and 1 month) were also compared. Results 30 cases in group A recovered (85.7%), and 28 cases in group B recovered (80.0%), the result of which shows no statistic significance. The hospital stays and expense in group B were significantly lower than those in group A. 4 cases of group A suffered from incision complications , 2 intra-abdominal hemorrhage , 1 severe pneumonia and 1 septic shock. 2 cases in group B suffered from stomachache. The differences can be shown significantly. The infection score between the two groups shows no significant difference, but the score was found to be obviously lower after treatment than before. The infection score decreased by an average of 19.9 in group A and 23.5 in group B,indicating a better anti-infective effect in group B. Conclusion Interventional catheter drainage combined with ozone therapy for the management of postoperative enterocutaneous fistula is safe and effective, with lower hospital stays and expense.

BACKGROUND:Bone marrow mesenchymal stem cells have particularly applied prospects in tissue engineering. However, the death of transplanted cells limits the tissue regeneration. To search a new drug of anti-free radicals and protecting bone marrow mesenchymal stem cells is of great significance. OBJECTIVE:To investigate the protective effects of mangiferin on bone marrow mesenchymal stem cells against hypoxia. METHODS:Rat bone marrow mesenchymal stem cells were cultured in vitro and hypoxia cellmodel was established by cobalt chloride. cells were divided into normal control group, hypoxia group (treated with cobalt chloride), and mangiferin groups (cobalt chloride+20, 40, 80, 160 μmol/L mangiferin). After 12 and 24 hours of hypoxia, superoxide dismutase, malondialdehyde, and catalase levels in the cellsupernatant were determined. After 3, 6, 12, 24 hours of hypoxia, reactive oxygen species change was detected in each group. RESULTS AND CONCLUSION:Mangiferin significantly improved the survival rate of bone marrow mesenchymal stem cells exposed to hypoxia, increased the intracellular superoxide dismutase and catalase activities, decreased intracellular malondialdehyde and reactive oxygen species levels, thereby effectively protecting bone marrow mesenchymal stem cells against hypoxia. These findings indicate that mangiferin has effective protection against hypoxia and strong antioxidant ability, and can significantly reduce oxidative damage.

Objective To evaluate the safety and diagnostic accuracy of preoperative endoscopic ultrasound-guid﹣ed fine-needle aspiration in patients with pancreatic cancer. Methods 256 patients with pancreatic cancer from Jan﹣uary 2010 to December 2014, 82 were considered resectable on the basis of cross-sectional imaging findings. Of these patients, 54 underwent EUS-FNA before surgery (FNA+group) and 28 underwent surgery without preoperative EUS-FNA (FNA- group), the diagnosis result of EUS-FNA and the survival time of the two groups were observed. Results All 54 lesions were visible on EUS, and all 54 attempts at FNA were technically successful. The diagnostic accuracy according to cytology and histology findings was 94.44 % (51/54) and 88.89% (48/54), respectively, and the total accuracy was 94.44 % (51/54). Two patients developed mild pancreatitis and two hemorrhage after EUS-FNA but were successfully treated by conservative therapy. No severe complications occurred after EUS-FNA. In the FNA+and FNA- groups, the median relapse-free survival (RFS) was 282 and 265 d, respectively (P>0.05), and the median overall survival (OS) was 568 and 557 d, respectively (P>0.05). RFS and OS were therefore not inferior in the FNA+group. These data indicate that the usage of EUS-FNA did not influence RFS or OS, nor did it increase the risk of other complications. Conclusions Preoperative EUS-FNA is a safe and accurate diagnostic method.

Objective To compare the success rate, operation time, complication rate and the degree of tolerance of two kinds of endoscopic placement of small intestine decompression tube. Method 68 intestinal obstruction patients treated with transnasal ileus tube were randomly divided into 2 groups, group A and group B, 34 cases in each. Patients in group A were treated by endoscopic placement, while in group B placement was guided by nasal endoscope. Results The catheterization success rate and complications between the two groups have no statistical significance (P > 0.05) while the differences of catheter operation time (P < 0.05) and placement tolerance (P < 0.01) have statistical significance. Conclusion Endoscopic placement of small intestinal decompression tube has clinical application value while placement guided by nasal endoscope has certain advantages.

Objective To evaluate the applicant effect of improved flushing suction method for SpyClass choledochoscope operation. Methods Seventy-three patients who underwent SpyGlass choledocho-scopy from February 2013 to January 2015 were enrolled. Negative pressure biopsy channel was used in group A(n= 34)during conducting SpyGlass choledochoscopy with the tube directly connected to the conveying pipe and combined with duodenoscope suction.In group B(n= 39),the biopsy channel of disposable syringe jacket was first connected to a delivery catheter,then the negative pressure pipe was put in the injector coat, combined with duodenoscope suction. Adverse reactions,theⅠ image acquisition time after the placement of SpyGlass delivery catheter to pancreaticobiliary duct,the total operation time,and the occurrence of compli-cations after operation were recorded. Results Sinus bradycardia,arrhythmia,agitation occurred in 7 cases (20. 6%),5 cases( 14. 7%),and 10 cases( 29. 4%) respectively in group A,those were 1 case (2. 6%),0 case(0/ 39),2 cases(5. 1%)respectively in group B with significant difference(P<0. 05). The time to acquire a clear image and the total operation time in group A were 6. 2 min and 24. 9 min,and 3. 3 min and 16. 8 minutes in B group with significant difference(P<0. 05),postoperative cholangitis oc-curred in 5 cases in group A(14. 7%),1 case(2. 6%)in group B with significant difference(P<0. 05). Conclusion New irrigation and suction method has obvious advantages in the SpyGlass system.

BACKGROUND:Hypoxic death limits application of cells in transplantation and tissue regeneration.
OBJECTIVE:To investigate the protective effects of mangiferin on bone marrow-derived mesenchymal stem cells against hypoxia injury-induced apoptosis resulted from cobalt chloride.
METHODS:Rat bone marrow-derived mesenchymal stem cells were in vitro cultured and hypoxia cellmodel was established by cobalt chloride. Model cells were treated with mangiferin. Protective effects of mangiferin were detected using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide;cellapoptosis and mitochondrial membrane potential were detected using flow cytometry.
RESULTS AND CONCLUSION:Cobalt chloride significantly inhibited growth of bone marrow-derived mesenchymal stem cells in a dose-dependent manner. The apoptosis rate of cells was (42.49±3.96)%after treated with 200μmol/L cobalt chloride for 12 hours, (46.37±4.49)%after treated for 24 hours. With increasing concentration of mangiferin, apoptosis of bone marrow-derived mesenchymal stem cells in hypoxic model was gradual y reduced (P<0.01), indicating that mangiferin has a protective effect in a concentration-dependent manner on rat bone marrow-derived mesenchymal stem cells in hypoxic injury. Cobalt chloride can induce hypoxic model successful y in bone marrow-derived mesenchymal stem cells. There are some advantages of accurate dose control, no special equipment requirements, and easy operation. Mangiferin can effectively inhibit bone marrow-derived mesenchymal stem cells apoptosis under hypoxic injury.

This paper introduces a type of anaesthesia workstation which is composed of two vertical medical chests, i.e. the upper and lower parts. Taken out of the chest, the two parts are butted against and locked to make the workstation ready for operation. After operation is finished, the two parts are uncoupled and put into the chests, and then the workstation can be stored and transported with the chests closed.

Objective To evaluate the feasibility and safety of endoscopic intraluminal closure of small colon perforation with metal clips in porcine model.Methods A 2 cm full-thickness colon perforation was made in 4 bama mini-pigs.One did not receive local closure as a control, while 3 others underwent closure with bi-and tri-arm clips, one of which received additional fibrin glue injection after closure.Necropsy was done on day 14 after the procedure, and dye leak test, peritoneal fluid bacteria culture and histological examination were performed.During the 2 week observation period, the body temperature and blood leukocytes count were recorded and compared.Results Endoscopic closure of the colon perforation was technically successful in all 3 pigs.The body temperature and blood leukocyte count of these pigs were both lower than those of the control.Necropsy showed that the perforation in control pig was not completely closed and with multiple adhesions around.Perforation complete closure and pathological healing without adhesion were observed in 2 pigs with clip closure only, while adhesion and incomplete pathological healing was detected in the other one with clip closure plus fibrinogen injection (P＜0.05).Conclusion Endoscopic intraluminal closure of a 2 cm colon perforation with metal clips is feasible and safe, while further study is needed to evaluate the effect of combined local fibrinogen injection.

UNLABELLEDOBJECTIVE This study aims to construct a chitosan (CS)-polycaprolactone (PCL)-hydroxyapatite (HA) composite biomimetic scaffold to replace condyle and to explore the tissue engineering applications of condylar.

METHODSA resin mold of the mandibular condyle was prepared by using rapid prototyping techniques. A mandibular condylar integrated biomimetic scaffold model was prepared by solution casting-ice Lek. PCL and CS were mixed at a ratio of 4:1. HA at quality ratios of 40%, 50%, 60%, and 70% was added to groups a, b, c, and d, respectively. The microscopic morphology, porosity, infrared spectra, X-ray diffraction pattern, and mechanical properties of the scaffold were observed.

RESULTSThe scaffold that includes both upper and lower parts displayed the same features (i.e., shape, yellow-white appearance, and hard texture) as the mandibular condyle. Scanning electron microscopy showed that the composite scaffold had a 3D network spatial structure, 70%-85% porosity, and 10-200 µm pore size. Infrared spectra showed that the peak intensity reduced with decreasing HA content. X-ray diffraction showed that the diffraction peak decreased with increasing HA content. Suitable tensile and compressive and flexural strength were discovered in the presence of 50% HA.

CONCLUSIONThe scaffold prepared by solution casting-ice Lek shows favorable comprehensive features and is expected to replace human condylar.

Chitosan ; Durapatite ; Hardness ; Humans ; Mandible ; Microscopy, Electron, Scanning ; Polyesters ; Porosity ; Tissue Engineering ; Tissue Scaffolds ; X-Ray Diffraction