Objective It was demonstrated that pulsatile perfusion (PP) is more physiologic and better than non-pulsatile perfusion (NPP) in maintaining blood circulation in vital organs. The purpose of this study was to determine the effect of PP on cerebral cortical blood flow(CCBF) after deep hypothermic circulatory arrest(DHCA) and the duration of safe DHCA. Methods Thirty-nine adult healthy mongrel dogs of either sex, weighing 10-15 kg were divided into two groups: PP group (n = 18) and NPP group (n = 21) . The animals were anesthetized with intravenous pentobarbital 25mg?kg-1 . After tracheal intubation the animals were mechanically ventilated. Right femoral artery and vein were cannulated for intra-arterial pressure monitoring and infusion. The chest was opened and heart exposed. CPB was started after insertion of venous drainage catheter into right atrium and arterial cannula into ascending aorta. The bypass pump was shut off when the brain was cooled to 20℃. Circulatory arrest was maintained for 40 min, 60min or 80 min respectively. CCBF was measured during cooling and rewarming at 35℃, 30℃, 25℃and 20℃ by hydrogen clearance technique. Results During cooling CCBF gradually decreased and there was no difference in CCBF between the groups. After 40 min DHCA during rewarming CCBF increased significantly faster in PP group than in NPP group during the early period but CCBF returned to pre-cooling baseline level at the end of rewarming in both groups. After 60 min DHCA during rewarming when brain temperature returned to 30℃ and above , CCBF increased significantly faster in PP group than that in NPP group and returned to pre-cooling baseline level at the end of rewarming in both groups. Electron microscopic examination revealed that ultrastructure of neurons was normal after 40 min DHCA in both groups. After 60 min DHCA the ultrastructure was normal in PP group but swelling of neurons andedema of mitochondria could be seen in NPP group. After 80 min DHCA marked neuronal damages could be seen in both groups.Conclusions The results of our study suggest that PP improves CBF after DHCA and can protect brain from ischemic and hypoxic damages induced by DHCA and the duration of safe DHCA at 20℃ should be less than 60 min.

Acetic Acid ; analysis ; Chromatography, Ion Exchange ; Workplace

Objective To investigate the transactivating effect of hepatitis C virus(HCV)core protein on inducible nitric oxide synthase(iNOS)gene promoter and the molecular biological mecha- nisms of HCV pathogenesis.Methods Polymerase chain reaction(PCR)technique was employed to amplify the sequence of iNOS promoter by using HepG2 genomic DNA as template,and the product was cloned into pGEM-T vector.The iNOSp gene was cut from T-iNOSp by KpnⅠand XhoⅠ,and then was cloned into pCAT3-Basic,the constructed vector was named as pCAT3-iNOSp,pCAT3-iN- OSp was transfected into the LO_2 cell line.LO_2 cell was also cotransfected with pcDNA3.1(-)-core and pCAT3-iNOSp by FuGENE 6 transfection reagents.The LO_2 cells transfected with pCAT3-Basic was used as negative control.The activity of CAT in LO_2 cells was detected by an ELISA kit after 48 hours,which reflected the transactivating function of HCV core protein to iNOS gene promoter.Re- sults The expressive vector pcDNA3.1(-)-core and report vector pCAT3-iNOSp had been construc- ted and confirmed by restriction enzyme digestion and sequencing.The expression of CAT in LO_2 cells transfected with pCAT3-iNOSp and peDNA3,1(-)-core was 11 times as higher as that of pCAT3-bas- ic,and 6 times as higher as that of pCAT3-iNOSp.Conclusion It is suggested that HCV core protein can transactivate iNOS gene promoter.

Histiocytoma, Malignant Fibrous ; pathology ; Humans ; Laryngeal Neoplasms ; pathology ; Lymph Nodes ; pathology ; Lymphatic Metastasis ; pathology ; Male ; Middle Aged ; Neck

Adult ; Andrology ; China ; Drugs, Chinese Herbal ; therapeutic use ; Humans ; Infertility, Male ; drug therapy ; Male ; Medicine, Chinese Traditional ; Phytotherapy ; Sexual Dysfunctions, Psychological ; drug therapy

Adolescent ; Female ; Humans ; Patellar Dislocation ; physiopathology ; surgery ; Patellar Ligament ; injuries ; physiopathology ; surgery ; Range of Motion, Articular ; Reconstructive Surgical Procedures

AIM To study the effects of dexamethasone on expressing monocyte chemoattractant protein 1(MCP 1 ) mRNA in the rats with pulmonary fibrosis, elaborate the molecular mechanism of dexamethasone (Dxs) in pulmonary fibrosis therapy. METHODS The model of pulmonary fibrosis was established by instilling bleomycin intratracheally. After treating with Dxs ip , the levels of MCP 1 mRNA were determined by RT PCR. The histological changes were observed and the numbers of inflammatory cells were counted in optical microscopy field. RESULTS The accumulation of inflammatory cells decreased markedly, and the symptom of pulmonary fibrosis was alleviated. Furthermore, Dxs evidently inhibited the expression of MCP 1 mRNA in lung tissues with pulmonary fibrosis. CONCLUSION The molecular mechanism of Dxs in pulmonary fibrosis therapy was associated with inhibiting the expression of MCP 1 mRNA.

AIM　To study the effects of dexamethasone on expressing monocyte chemoattractant protein-1(MCP-1 ) mRNA in the rats with pulmonary fibrosis, elaborate the molecular mechanism of dexamethasone (Dxs) in pulmonary fibrosis therapy. METHODS　The model of pulmonary fibrosis was established by instilling bleomycin intratracheally. After treating with Dxsip, the levels of MCP-1 mRNA were determined by RT-PCR. The histological changes were observed and the numbers of inflammatory cells were counted in optical microscopy field. RESULTS　The accumulation of inflammatory cells decreased markedly, and the symptom of pulmonary fibrosis was alleviated. Furthermore, Dxs evidently inhibited the expression of MCP-1 mRNA in lung tissues with pulmonary fibrosis. CONCLUSION　The molecular mechanism of Dxs in pulmonary fibrosis therapy was associated with inhibiting the expression of MCP-1 mRNA.

Objective This study on a medium-fidelity simulator (SimMan , Laerdal Medical Corpo-ration,Wappingers Falls, NY, USA) examined the management of unanticipated difficult airway by residents of anesthesiology and the effect of training in this context.Methods 30 residents of anesthesiology were devided into two groups (T and E). There were two scenarios investigated:'can't intubate, can oxygenate'(CI) and'can't intubate, can't oxygenate'(CICO). The E group was trained by scene simulation in the second, fourth, sixth month respectively before and after the training, and the T group received the same situation simulation training on the same day after the theoretical training and in the second, sixth month after the training. In con-trast to standard operating procedures, the performance of two groups of trainees was recorded on the basis of pre established evaluation criteria. Data differences between the two groups were analyzed using SPSS 23.0,t test, M-W test andx2 test.ResultIn CI, success rate of placement of astandard and intubating laryngeal mask air-way were high in T group (87％ vs. 55％ ,P=0.037). This was sustained over time. There was no difference in duration and incidence of desaturation between two groups. In CICO, there was a more structured approach following training in T group (P<0.05), which wasn't sustained over time. But this was sustained over 6 months in E group.ConclusionSituational simulation training can significantly improve the anesthesiology residents' ability to take proper response measures to the unexpected difficult airway, and significantly shorten the training time for emergency airway treatment. Repeated situational simulation training should be conducted at intervals of 2 months or less, allowing residents to maintain emergency response to the emergency airway.

Objective To compare the expression changes of neuropeptide Y (NPY) receptor Y1 in different stages of osteoblast differentiation of rat bone marrow mesenchymal stem cells (BMSCs).Methods The rBMSCs were isolated in vitro from Sprague-Dawley (SD) rats using whole bone marrow adherence method and cultured. Then, the rBMSCs were divided into osteoblast-induced group and noninduced group. In different periods of culture at 1, 2 and 3 weeks, identification of the osteoblasts was performed by using immunocytochemistry and Western blot. Expressions of mRNA and protein of Y1 receptor were detected by real time reserve transcriptase-polymerase chain reaction (RT-PCR) and Western blot. Results RT-PCR demonstrated that osteoblast-induced group had a lower expression of Y1 receptor than non-induced group at the same time point and the expression of Y1 receptor was increased in a time-dependent manner in both groups. Western blot demonstrated higher expression of Y1 receptor in osteoblast-induced group compared with non-induced group at the same time point and a decreased expression of Y1 receptor in a time-dependent manner in both groups. Conclusions During the process of osteoblastic differentiation of rat BMSCs, the expressions of mRNA and protein of NPY Y1 receptor show different trends, when NPY may mediate the inhibition of osteoblastic differentiation of BMSCs through Y1 receptor pathway.