AIM To observe the effects of different interval administration of exogenous brain derived neurotrophic factor (BDNF) on hypoxic ischemic encephalopathy in neonatal rats. METHODS BDNF (0 5 ?g) was microinjected intracerebroventricularly at 0, 1 and 4 h after the hypoxic ischemic encephal opathy in 7 d neonatal Sprague Dawley rats undergone by ligation of left common carotid artery followed by a 2 5 h inhalation of humidified 8% O 2+92% N 2 at 37℃ immediately after the injury, respectively. Changes of brain edema, levels of malondialehyde (MDA) and neuronal apoptosis at the left cortex and hippocampus were investigated 24 h after the injury. RESULTS The most prominent effect of BDNF was seen in 0 h group with a marked decreases in brain edema and levels of MDA and a significantly alleviated neuronal apoptosis while it was lowered obviously when administered at 4 h after the insult. CONCLUSION BDNF exerts a prominent protective effect on hypoxic ischemic encephalopathy in neonatal rats when given as early as possible after the injury rather than later administration.

Objective To reveal the fibrillar network in vitreous and the effect of plasmin on this network. Methods 20 vitreous gels of freshly slaughtered pigs were divided into 2 groups, the gels in first group were digested by 3 U plasmin (3 U/ml) at 37℃ for 24 hours respectively, the second group received the same PBS as control. After digestion, gels were fixed in neutral buffered formalin solution. Samples from vitreous base, cortex and the central region were observed by the technique of freeze etching electron microscopy. Results In vitreous collagen fibril network was in a three-dimensional array, collagen fibril density showed marked differences, central vitreous had the sparse fibril density, the cortex denser and the basal vitreous densest. After digestion by plasmin, the collagen fibrillar network was destructed. Conclusion Collagen fibrils in vitreous present spatial arrangement regularly, plasmin can lead to destruction of the fibrillar network.

Applying the specialized Master of Public Health (MPH) degree education is one of the most important parts of our nation's medical degree system innovation. It has a positive effect on the development of health care in our country. To ensure the quality of the MPH degree, we should be more careful with course studies, do better in field and social practice, be stricter with degree dissertation rejoining, and supervise and control the process of the training.

Objective To explore the effects of brain derived neurotrophic factors (BDNF) on concentrations of cerebral endogenous opioid peptides(EOP)in neonatal rats subject to with hypoxic ischemic brain injury (HIBI). Methods Seven day old Sprague Dawley rats were randomly divided into a HIBI+BDNF group (group A),a HIBI group (group B) and a sham operation group (group C). Models of HIBI were established by use of permanent ligation of the left common carotid artery followed by 2.5 hours ofinhalation of 8%O 2+92%N 2, then 0.5 ?g BDNF was injected into the parietal cerebral ventricle in group A immediately. Contents of dynorphin A 1 13 like, ? endorphin like and leu enkaphalin like immunoreactivities (ir DynA 1 13 , ir ? EP and ir LEK) in cortex and hippocampus were measured at 0, 60, 120 min after administration of BDNF. Results The concentrations of ir DynA 1 13 and ir ? EP in the cortex and hippocampus in group B were increased significantly than those in group C at most time points( P

Objective:To explore the value of pre- and postoperative red cell distribution width-to-lymphocyte count ratio (RLR) in predicting the disease-free survival (DFS) for non-metastatic colorectal cancer patients.Methods:The data of 108 patients pathologically diagnosed with non-metastatic colorectal adenocarcinoma after surgery from December 2012 to January 2020 in Hainan Hospital of PLA General Hospital were retrospectively analyzed. RLR was calculated and its differences in patients with varied clinicopathological characteristics were analyzed. The receiver operating characteristics (ROC) curve was applied to analyze the value of pre- and postoperative RLR in predicting DFS of patients, and the cut-off value was determined by Youden index. DFS of patients with different stratification stratified by a cut-off value of RLR was analyzed by using Kaplan-Meier method followed by log-rank test. Cox proportional hazards model was used to make univariate and multivariate analysis.Results:Youden index of pre- and postoperative RLR in predicting DFS was 8.86%, 9.15%; based on the above index, the patients were divided into the preoperative RLR<8.86% group (73 cases) and preoperative RLR≥8.86% group (35 cases), postoperative RLR<9.15% group (48 cases) and postoperative RLR≥9.15% group (60 cases). According to ROC curve, the area under the curve (AUC) of preoperative RLR in predicating DFS was 0.66 (95% CI 0.55-0.77, P = 0.01), and AUC of postoperative RLR in predicating DFS was 0.62 (95% CI 0.51-0.74, P = 0.04). Pre- and postoperative RLR cut-off values were used to predict 3-year DFS rate of patients with the sensitivity of 51.60% and 71.00%, respectively, and the specificity of 76.60% and 50.60%, respectively. Kaplan-Meier analysis showed that patients in preoperative RLR<8.86% group had a better DFS compared with those in preoperative RLR≥8.86% group ( χ2 = 7.35, P < 0.01); there was no statistical difference in DFS between postoperative RLR<9.15% group and postoperative RLR≥9.15% group ( χ2 = 3.69, P = 0.06). Preoperative RLR was an independent affecting factor for DFS of patients ( HR = 1.13, 95% CI 1.04-1.22, P <0.01). Conclusions:Pre- and postoperative RLR could be useful in predicating 3-year DFS for patients with non-metastatic colorectal cancer. Preoperative RLR is an independent affecting factor for DFS, and the patients with low RLR have a better prognosis.

Objective To study the value of oxygen treatment on elderly patients with acute ischemic stroke.Methods From April 2010 to March 2012,a total of 140 cases of elderly patients with acute ischemic stroke for oxygen therapy combined with drug and rehabilitation were divided into two groups,outside high-flow oxygen group of 71 cases,hyperbaric oxygen group of 69 cases.The neurological functional defects scale was used to evaluate the effect.Two groups of patients were given conventional drug therapy including improving the microcirculation,vegetative neural drugs,and rehabilitation treatment.Results The total effectiveness respectively was 98.6％ (70/71),91.3％ (63/69),and there was significant difference (P ＜ 0.05).After treatment,the nerve function damage grades of two groups respectively was (10.4 ± 1.7),(15.6 ± 1.8) scores,and there was significant difference compared with that before treatment [(28.2 ± 2.5),(28.7 ± 2.6) scores] (P ＜ 0.05).There was significant difference in treatment adherence between two groups (P ＜ 0.05).Conclusion For patients of elderly patients with acute ischemic stroke,oxygen therapy is necessary,while outside high-flow oxygen therapy is better than hyperbaric oxygen therapy.

Objective To study the correlation between amino terminal B-type natriuretic peptide precursor(NT-proBNP) and risk factors of acute coronary syndrome (ACS) with elder patients.Methods One hundred and twenty-eight ACS patients were divided into unstable angina pectoris (UAP) group with 52 samples,ST elevation myocardial infarction (STEMI) group with 35 samples and non-ST elevation myocardial infarction (NSTEMI) group with 41 samples.Meanwhile 45 healthy elder people were adopted as control group.Firstly,the subjects of blood pressure,body mass index (BMI) and smoking numbers were measured.Secondly,venous blood was collected to assay NT-proBNP,cardiac troponin Ⅰ (cTn Ⅰ),homocysteine (Hcy),blood-lipoids and C-reactive protein(CRP).Lastly,ultrasonic cardiogram was used to test left ventricular end diastolic diameter(LVEDD),left ventricular end systolic diameter (LVESD) and left ventricular ejection fraction (LVEF).In addition,correlation analysis was researched between NT-proBNP and other factors.Results NT-proBNP levels of UAP,STEMI and NSTEMI groups were significantly higher than the control group ((794.18±182.64) ng/L,(872.43±245.67) ng/L,(557.25±163.81) ng/L) and (125.84±59.27) ng/L,P ＜ 0.05).NT-proBNP was positive correlation with systolic blood pressure,diastolic blood pressure,Hcy and CRP (r=0.182,0.176,0.281,0.191;P=0.040,0.043,0.001,0.031),however negative with LVEF(r=-0.247,P =0.005).Conclusion NT-proBNP level is sensitive to monitor ACS variety,and it is significant to test NT-proBNP combining Hcy,CRP,and cTn Ⅰ for diagnosing and treating ACS.

Objective To discuss the relationship between c-reactive protein and prognosis of acute coronary syndrome.Methods C-reactive protein of 60 acute coronary syndrome aged patients was evaluated.The patients were divided into two groups:one group with higher CRP level and another group with normal CRP level.The following-up duration was 6 months.After correct therapy,the morbidity of re-angina,arrbythmia,heart failure,re-infarction and cardiac death was compared.Results The morbidity of re-angina,arrhythmia,heart failure,re-infarction,cardiac death was 46.3%(19/41),43.9%(18/41),9.8%(4/41),22.0%(9/41),7.3%(3/41)respectively in higher Clip levd group;The morbidity of re-angina,arrhythmia,heart failure,re-infarction was 15.8%(3/19),10.5%(2/19),5.3%(1/19),5.3%(1/19)respectively in normal CRP group and there was no cardiac death accident.There was significant difference between the two groups.Conclusion CRP plays an important role in the onset of acute coronary syndrome,and its level is related with the higher morbidity of re-angina,arrbythmia,heart failure,re-infarction and cardiac death.

Objective To explore the effects of hyperbaric oxygen(HBO) on brain derived neurotrophic factor(BDNF) and the changes of neuron structure after cerebral ischemia-reperfusion(CIR) in mice. Methods Twenty-seven mice were randomly and evenly divided into three groups : a HBO group, a control group and a sham-operation group (SO group). CIR models were established by clamping both carotid arteries in mice for 30 min,and then, untying clamps. 0.20 MPa HBO was applied once a day for 10 days after establishment of models in HBO group,but not in the control and SO groups. Following sacrifice after treatment and acquirement of cortex and hippocamal tissues, HE stain and immunohistochemistry technique were used to observe the changes of neuron structure and expression of BDNF. Results The neural degeneration and necrosis in cortex and hippocampus (issues) were observed under light microscope after CIR, and the amount of abnormal cells in the control group was more than that in HBO group (P

Objective To investigate any therapeutic effect of combining hyperbaric oxygen with mesenchymal stem cells (MSCs) in treating traumatic brain injury (TBI).Methods Eighty healthy adult rats were randomly divided into a control group,a hyperbaric oxygen group,a stem cell group and a combination group,each of 20.TBI was introduced into the rats of all 4 groups.Twenty-four hours after the modelling,the hyperbaric oxygen group received hyperbaric oxygen therapy,the stem cell group received MSCs transplantation,the combination group was given the hyperbaric oxygen therapy an hour after the MSCs transplantation,while the control group was not given any treatment.All of the rats were evaluated using neurological severity scores (NSSs) after the modeling and again after the treatment.They were then sacrificed for HE staining and the expression of nuclear factor kappa B (NF-kB) and brain-derived neurotrophic factor (BDNF) were observed.Results On the 3rd,5th,10th and 20th day after the modeling,the average NSS of the combination group was significantly lower than those of the other three groups.However,the average NSS of the combination group on the 20th day was significantly superior to that on the 3rd and the 5th days.Compared with the control group,the edema of brain cells was less severe in the other 3 groups.The average expression of NF-kB and BDNF in the combination group was significantly higher than in the other 3 groups on the 3rd,5th,10th and 20th day after the modeling.Conclusion Hyperbaric oxygen,especially long term treatment combined with stem cell transplantation,can significantly improve nerve function in the brain after trauma,relieve inflammation and edema in and around the damaged area,and promote the expression of the NF-kB and BDNF.