Objective To evaluate the differences between fresh and cryopreserved human umbilical cord blood as well as the stem cell homing.Methods Fresh or cryopreserved human umbilical cord blood cells were injected into lethally irradiated BALB/C nu+ mice.The mice survival rates,the successful transplantation evidence and the migration phenomenon were observed.Results The survival rates of the fresh group and the cryopreserved group were much higher than the control group,but there was no difference between the former two groups.Evidence of human hematopoiesis were observed by means of PCR or FACS.However,the pattern of migration was different berween fresh and cryopreserved cord blood stem cells. Conclusion Human cord blood contains high hematopoietic potential stem cells to cross xenogenetic barriers and successfully engraft in mice.Cryopreservation can keep the hematopoietic potential of cord blood,but may influence the adhesion molecular of the stem cells and thus influence their homing behavior.

Fluid-attenuated inversion recovery vascular hyperintensity (FVH) is a common magnetic resonance imaging findings in acute ischemic stroke due to severe stenosis or occlusion of large cerebral arteries.This article reviews the applications and related research of FVH in patients with acute ischemic stroke.

Objective To investigate the therapeutic effect of autologous stem cell transplantation research for patients with cerebral hemorrhage sequelae under the stereotactic.Methods One hundred patients with cerebral hemorrhage from Jan.2011 to Sep.2013 in our hospital were selected and randomly divided into the experimental group (n =50) and the control group (n =50).The patients of experimental group were given autologous stem cell transplantation under the stereotactic in 6 months after cerebral hemorrhage,while the patients in control group were just given traditional treatment.At 6,7 and 12 months after cerebral hemorrhage,rate with neural function defect scale and functional independence measure(FIM) scores of the two groups were compared.Results FIM scores in the experimental group was 102.08 ± 8.28,significant higher than that in control group(95.28±8.75,P＜0.05).Functional independence measure scores in the experimental group at 7 months after cerebral hemorrhage was 13.12±4.00,significant lower than that in control group(20.40±4.33,P ＜0.05).While,there was no statistical difference at 6 months and 12 months after cerebral hemorrhage between the two groups(P＞0.05).Conclusion The therapeutic of autologous stem cell transplantation on patients with cerebral hemorrhage sequelae under the stereotactic is benefit at short term,but the long term therapy effective still needs further study.

Objective: The compare the safety and efficacy between cryoablation (CRYO) and radiofrequency catheter ablation (RFCA) for treating the patients with atrio-ventricular nodal reentrant tachycardia (AVNRT) by meta-analysis.
Methods: We systemically searched the Medline, Cochrane library and Embase database to fulifll our pre-deifned criteria until the publication of May 2014.
Results: There were 5 randomized controlled trials (RCTs) and 14 retrospective trials enrolled in our study with 2900 patients. The patients were allocated into 2 groups:CRYO group, n=1384 and RFCA group, n=1516. The overall pool-analysis demonstrated that compared with RFCA group, CRYO group had the lower risk of permanent atrio-ventricular nodal block (OR:0.27, 95%CI 0.11 to 0.62, P<0.01) and shorter X-ray exposure time (WMD:-3.36, 95%CI-5.58 to-1.15, P<0.01);while CRYO group had the lower immediate procedural success rate (OR:0.63, 95%CI 0.42 to 0.96, P<0.05), longer procedural time (WMD:10.97, 95%CI 3.35 to 18.58, P<0.01), and higher long-term arrhythmia recurrence rate (OR:2.89, 95%CI 2.05 to 4.06, P<0.01).
Conclusion: Although CRYO could decrease the risk of permanent atrio-ventricular nodal block, while its effectiveness was lower than RFCA for AVNRT treatment in relevant patients.

BACKGROUND:Autologous island flap transplantation is the main therapy for burn scars. Floating and necrosis of transplanted flaps mainly impact the therapeutic effects. Dexamethasone has immunoregulatory function during trauma and stress process. OBJECTIVE:To investigate the effect of dexamethasone on immune balance of Th1/Th2 and prognosis in patients with burn scars undergoing autologous island flap transplantation. METHODS:Sixty-eight patients with burn scars undergoing transplantation of pedicled island flap were selected and randomly divided into control group and experimental group. Patients in the two groups were treated with negative pressure drainage under skin flap, infection prevention, improvement of microcirculation. After that, dexamethasone sodium phosphate (0.2 mg/kg) was immediately given in the experimental group, and the dose gradualy decreased after 3 days until drug withdrawal at 7 days. Levels of Th1, Th2, Th1/Th2 and interferon-γ, interleukin-4 were compared between the two groups before and 1 week after transplantation. In addition, incidence rates of skin flap necrosis, hemodynamic disorder, and effusion were compared between the two groups. RESULTS AND CONCLUSION:The levels of Th1, Th2, Th1/Th2, interferon-γ and interleukin-4 had no obvious differences between the two groups before flap transplantation. At 1 week after transplantation, the levels of Th1 and Th1/Th2 were higher, while the levels of Th2, interferon-γ and interleukin-4 were lower in the experimental group than the control group. Moreover, the incidence of complications was also lower in the experimental group than the control group. In conclude, dexamethasone can decrease the incidence of complications after island flap transplantation, which is maybe the result of adjusting immune balance of Th1/Th2.

During the foreign aid mission against Ebola,the 302 Military Hospital of PLA strengthened emergency science research management according to the features of this task and the reality,and toke effective measures in research direction selection,human resources concordance,scientific potential transformation and other aspects,which contributed to the successful completion of this mission.They gathered experiences in emergency science research management and gave recommendations for similar tasks in the future.

Objective To know about the influence of quality control based on Gantt chart on work quality and stress,so as to explore effective method of management suitable for them.Methods 52 nurses from the eastern zone of a three A-level hospital in Jiujiang City were randomly selected as the experimental group,they were implemented with Gantt chart management.Another 52 nurses from the western zone of the same hospital were selected as the control group,they were executed traditional experience-based management.The scores of quality of care and nurses stress were compared between the two groups.Results For the score of the quality of care,the experimental group was higher;,for the score of the nurses stress,the experimental group was lower in the overall sides,and the differences were significant except those of the working environment and equipment,which showed no significant difference between two groups.Conclusions Gantt management method can significantly improve the quality of care,moreover,effectively alleviate the nurses'stress.

Objective To investigate the effect of leptin (LEP) pretreatment on hypoxia-reoxygenation (H/R) induced apoptusis in human L02 liver cells. Methods Human L02 liver cells were obtained from pharmacology laboratory, Zhong-Shan University and cultured in DMEM liquid culture medium in an incubator filled with 5% CO_2 at 37℃. The cells were divided into 6 groups ( n = 6 each) : group control (group C) ; grouphypoxia-reoxygenation (group H/R); group Ⅰ-Ⅳ pretreatment with LEP 100, 200, 400 and 800 μg/L + H/R. In group H/R and group Ⅰ-Ⅳ L02 cells were exposed to 95% N_2-5% CO_2 for 12 h followed by 12 h reoxygenation. In group Ⅰ-Ⅳ the cells were pretreated with LEP 100, 200, 400, 800 μg/L respectively before H/R. At the end of 12 h of reoxygenation, the cells were centrifuged and the supematant was collected for determination of ALT and AST concentrations. Apoptosis in L02 cells was detected by Hoechst 33342/PI staining. Fluorescent quantitative PCR was used to detect Bax and Bcl-2 mRNA expression. Results (1) ALT and AST concentrations were significantly increased after H/R. The increase in ALT and AST concentrations was ameliorated by pretreatment with LEP. (2) The H/R-induced apoptotic changes of the cells were attenuated by pretreatment with LEP. (3) The Bax mRNA and Bcl-2 mRNA expression was significantly increased in group H/R as compared with group C. Leptin pretreatmcnt significantly reduced Bax mRNA expression and increased Bcl-2 mRNA expression as compared with group H/R. Conclusion LEP pretreatment can decrease H/R-indtwed apoptosis in the L02 liver cells by down-regulation of Bax mRNA expression and up-regulation of Bcl-2 mRNA expression.

Objective To isolate and identify exosomes from serum samples of the patients with polymyositis / dermatomyositis (PM/ DM),and analyze their protein composition preliminarily.Methods Exosomes from serum samples of the patients with PM/DM were isolated and purified by the ExoQuickTM kit.The morphological characteristics and particle size of exosomes were determined by transmission electron microscope (TEM) and NanoSight analyzer,respectively.The surface markers of exosomes such as CD9,CD81 and Flotillin-2 were identified by western blot.The concentration and composition of exosome protein were determined by the BCA method and SDS-PAGE,respectively.Results The exosomes from serum samples of PM/DM patients displayed round or oval vesicles with membrane structure under TEM,and their diameter range was about (92 ± 67) nm.western blot showed that these exosomes expressed CD9,CD81 and Flotillin-2.The total protein concentrations of exosomes in the patients with PM/DM and healthy controls were 14.68 (6.00,32.55) μg/μL and 14.09 (8.00,23.28) μg/μL,respectively.SDS-PAGE showed that high-abundance proteins enriched in 55-70 kD in both PM/DM patients and healthy controls,and that there were different bands in 40-55 kD between them.Conclusion Exosomes are isolated from serum samples of the patients with PM/DM successfully,and their protein concentration and composition are analyzed preliminarily,which provides the experimental evidences for further finding differential proteins.

Objective To study the clinical efficacy of free anterolateral femoral skin flap on the repair of skin and subcutaneous soft tissue defects caused by excision of oversized malignant tumour in the skin. Methods A retrospective review was performed of free anterolateral femoral skin flap reconstructions for oversized malignant tumor cut on body surface since April 2007 to November 2010. There were 6 patients with head and limb squamous cell carcinoma because of bum scar and 3 patients with recurrence of dermatofibrosarcoma protuberans in wall of belly. The area of soft tissue defects ranged from 19 cm × 15 cm to 24 cm × 21 cm, and skin flaps was 20 cm × 16 cm to 25 cm × 22 cm in size. Three cases received radio therapy after operation. Results Nine flaps survived perfectly, one flap survived with partial necrosis and healed after changing dressings. No complications were observed in the donor site, including wound dehiscence, hernia and weakness. Follow-up survey of 12-24 months after the operation showed that the appearance and function in the repaired sites were normal, and norecurrence of the tumors. Conclusion Free transplantation of anterolateral femoral skin flap is relatively an ideal operative type for the repair of soft tissue defects caused by excision of oversized malignant tumour in the skin.