ObjectiveTo investigate the protective effect of Rehmanniae Radix iridoid glycosides （RIG） on the kidney tissue of streptozotocin （STZ）-induced diabetic mice and explore the underlying mechanism. MethodsTwelve of 72 male C57BL/6J mice were randomly selected as the normal group， and the remaining 60 mice were fed with a high-fat diet for six weeks combined with injection of 60 mg·kg^-1 STZ for 4 days to model type 2 diabetes mellitus. The successfully modeled mice were randomized into model， metformin （250 mg·kg^-1）， catalpol （100 mg·kg^-1）， low-dose RIG （RIG-L， 200 mg·kg^-1） and high-dose RIG （RIG-H， 400 mg·kg^-1） groups （n=11）. Mice in each group were administrated with corresponding drugs， while those in the normal group and model group were administrated with the same dose of distilled water by gavage once a day. After 8 weeks of intervention， an oral glucose tolerance test （OGTT） was performed， and the area under the curve （AUC） was calculated. After mice were sacrificed， both kidneys were collected. The body weight， kidney weight， and fasting blood glucose （FBG） were measured. Biochemical assays were performed to measure the serum levels of triglycerides （TG）， total cholesterol （TC）， serum creatinine （SCr）， and blood urea nitrogen （BUN）. Enzyme-linked immunosorbent assay （ELISA） was employed to determine the serum level of fasting insulin （FINS）， and the insulin sensitivity index （ISI） and homeostatic model assessment for insulin resistance （HOMA-IR） were calculated. The pathological changes in kidneys of mice were observed by hematoxylin-eosin staining and Masson staining. The immunohistochemical method （IHC） was employed to assess the expression of interleukin-1 （IL-1）， interleukin-6 （IL-6）， tumor necrosis factor-α（TNF-α）， transforming growth factor-β₁ （TGF-β₁）， and collagen-3 （ColⅢ） in the kidney tissue. The protein levels of TGF-β₁， cell signal transduction molecule 3 （Smad3）， matrix metalloproteinase-9 （MMP-9）， and ColⅢ in kidneys of mice were determined by Western blot. ResultsCompared with the normal group， the model group showcased decreased body weight and ISI （P<0.01）， increased kidney weight， FBG， AUC， FINS， HOMA-IR， TC， TG， SCr， and BUN （P<0.01）， glomerular hypertrophy， capsular space narrowing， and collagen deposition in the kidney， up-regulated protein levels of IL-1， IL-6， TNF-α， TGF-β₁， ColⅢ， and Smad3 （P<0.01）， and down-regulated protein level of MMP-9 （P<0.01） in the kidney tissue. Compared with the model group， the treatment groups had no significant difference in the body weight and decreased kidney weight （P<0.05， P<0.01）. The FBG level declined in the RIG-H group after treatment for 4-8 weeks and in the metformin， catalpol， and RIG-L groups after treatment for 6-8 weeks （P<0.01）. The AUC in the RIG-L， RIG-H， and metformin groups decreased （P<0.05， P<0.01）. The levels of TC， SCr， and BUN in the serum of mice in each treatment group became lowered （P<0.05， P<0.01）. The level of TG declined in the RIG-L， RIG-H， and metformin groups （P<0.05， P<0.01）. The serum level of FINS declined in the catalpol， RIG-L， and metformin groups （P<0.01）. Compared with the model group， the treatment groups showed decreased HOMA-IR （P<0.01）， increased ISI （P<0.01）， alleviated pathological changes in the kidney tissue， and down-regulated expression of IL-1 and TGF-β₁. In addition， the protein levels of IL-6， TNF-α， and ColⅢ in the RIG-H and metformin groups and IL-6 and TNF-α in the RIG-L group were down-regulated （P<0.05， P<0.01）， and the protein levels of IL-6， TNF-α， and ColⅢ in the catalpol group and ColⅢ in the RIG-L group showed a decreasing trend without statistical difference. The protein levels of TGF-β₁， Smad3， and ColⅢ in the RIG-H and metformin groups were down-regulated （P<0.01）. Compared with that in the model group， the protein level of MMP-9 was up-regulated in each treatment group （P<0.01）. ConclusionRIG can improve the renal structure and function of diabetic mice by regulating the TGF-β₁/Smads signaling pathway.

Formative assessment emphasizes timely feedback to guide and improve the learning process, benefiting both students and teachers through the evaluation–feedback–improvement–reevaluation mechanism. The Pediatric College of Chongqing Medical University has widely applied formative assessment to standardized residency training, and at the same time, has actively researched this method in undergraduate education to employ various formative assessment tools to establish a formative assessment-based pediatric education model that has specialized characteristics and can be popularized. We have demonstrated that the formative assessment-based education model can improve the teaching quality of pediatric medical education, and better meet the requirements of higher education and the new situation of medical education in the age of new medicine.

ObjectiveTo investigate the different effects of Yunvjian with or without Achyranthis Bidentatae Radix on glucose and lipid metabolism and inflammatory response in diabetic rats with the syndrome of Yin deficiency and internal heat. MethodThe rat model of diabetes due to Yin deficiency and internal heat was established by feeding with a high-sugar and high-fat diet and injection of thyroxine and streptozotocin. The successfully modeled rats were randomized into model control， Yunvjian without Achyranthis Bidentatae Radix （11.8 g·kg^-1）， Yunvjian with Achyranthis Bidentatae Radix （12.8 g·kg^-1）， and Achyranthis Bidentatae Radix （1.0 g·kg^-1） groups （n=10）， and another 10 rats were taken as the normal control group. Each group was administrated with corresponding drugs or saline by gavage for 28 days. The fasting blood glucose （FBG）， fasting insulin （FINS）， total cholesterol （TC）， triglycerides （TG）， low-density lipoprotein cholesterol （LDL-C）， and high-density lipoprotein cholesterol （HDL-C） in rats were measured. Enzyme-linked immunosorbent assay was employed to determine the levels of cyclic adenosine monophosphate （cAMP）， cyclic guanosine monophosphate （cGMP）， triiodothyronine （T₃）， thyroxine （T₄）， interleukin （IL）-1β， IL-6， tumor necrosis factor （TNF）-α， and C-reactive protein （CRP） in the serum. The histopathological changes of the liver were observed. The expression of lipoxygenase-2 （COX-2） was detected by immunofluorescence. The mRNA levels of nuclear transcription factors-κB （NF-κB）， monocyte chemotactic protein-1 （MCP-1）， and intercellular adhesion molecule-1 （ICAM-1） were determined by real-time polymerase chain reaction （Real-time PCR）.Western blot was employed to determine the protein levels of NF-κB in hibitory protein（IκB） kinase β （IKKβ）， IκBα， and phosphorylated IκBα （p-IκBα） in the liver and the protein levels of NF-κB in the cytoplasm and nucleus. ResultCompared with the normal group， the model group showed elevated levels of FBG， FINS， insulin resistance index， TC， TG， LDL-C， cAMP， T₃， T₄， IL-1β， IL-6， TNF-α， and CRP， up-regulated mRNA levels of NF-κB， MCP-1， and ICAM-1， and up-regulated protein levels of COX-2， p-IκBα， and nuclear NF-κB （P<0.01）. Compared with the model group， Yunvjian without Achyranthis Bidentatae Radix lowered the levels of FBG， FINS， insulin resistance index， TC， TG， LDL-C， cAMP， T₃， T₄， IL-1β， IL-6， TNF-α， and CRP， down-regulated the mRNA levels of NF-κB， MCP-1， and ICAM-1， and down-regulated the protein levels of COX-2， p-IκBα and nuclear NF-κB （P<0.05， P<0.01）. Compared with the Yunvjian without Achyranthis Bidentatae Radix， Yunvjian with Achyranthis Bidentatae Radix showed lowered levels of FBG， FINS， insulin resistance index， and inflammatory cytokines， down-regulated mRNA levels of NF-κB， MCP-1， and ICAM-1， and down-regulated protein levels of p-IκBα and nuclear NF-κB （P<0.05， P<0.01）. ConclusionAchyranthis Bidentatae Radix can enhance the performance of Yunvjian in reducing blood glucose and inhibiting inflammation in diabetic rats with the syndrome of yin deficiency and internal heat by down-regulating the IKK/IκB/NF-κB signaling pathway.

Objective:To explore the application value of X-ray tomographic fusion technique in assessing bone healing and osteotylus growth after femoral neck system(FNS)internal fixation of femoral neck fracture.Methods:A total of 18 patients with femoral neck fracture who admitted to the Department of Orthopedics of Beijing Haidian Hospital from October 2019 to June 2020 were selected.All of them were treated with FNS internal fixation,and conventional X-ray and X-ray tomographic fusion imaging were performed respectively at 1 month and 12 months after operation for them.The displays of the two imaging techniques for the bone healing and osteotylus growth after FNS internal fixation of femoral neck fracture were evaluated,and the relevant parameters of the two imaging techniques for the process of image detection of FNS internal fixation of femoral neck fracture were counted by statistical method.Results:The detection rate of X-ray tomographic fusion technique for osteotylus at 1 month after surgery was significantly lower than that at 12 months after surgery.The detection rates(94.44% and 61.11%)of X-ray tomographic fusion technique for osteotylus at 1 month and 12 months after surgery were significantly higher than those(61.11% and 33.33%)of X-ray(x2=5.100,5.790,P<0.05),respectively.The rank-sum test indicated there were significant differences in the distribution of the scores of the image qualities of osteotylus growths at 1 month and 12 months after surgery for patients with femoral neck fracture between two imaging techniques(Z=2.113,2.018,P<0.05),and there were significant differences in the image qualities of bone healing at 1 month and 12 months after surgery between two imaging techniques(Z=2.868,2.258,P<0.05).The display effect of the detection image of fracture site before treatment under the guidance of X-ray tomographic fusion technique was ideal,which images were clear and could display more fully and clearly the fracture line of patient.After 12 months of surgery,the continuous osteotylus that passed fracture line could be found at the anterior lateral position of X-ray,which has reached to clinical healing.In the process of detecting image of FNS internal fixation of femoral neck fracture,the air Kerma,dose area product and effective dose of X-ray tomographic fusion technique were significantly lower than those of conventional X-ray imaging(t=5.900,2.466,32.255,P<0.05),respectively.Conclusion:In the diagnosis and evaluation of bone healing of patients with FNS internal fixation after femoral neck fracture,the use of X-ray tomographic fusion technique can better detect the osteotylus growth of patients and judge the degree of bone healing,especially the judgment effect of that for the postoperative recovery with longer time of patients is more better.In addition,this technique has better safety,which would cause less radiation damage in the process of detection.

The epidemic of the coronavirus disease 2019 （COVID-19） has presented great challenges to the public health throughout the world. Therefore， it is crucial to foster high-level and multi-disciplinary public health talents to further improve public health. Herein， we summarize the current situation and challenges for public health education and prospect the requirements for training public health talents in China. Colleges and universities bear the responsibility for training public health talents， which is essential for the construction of public health system. In this context， we introduce the education for public health and the Doctor of Public Health （DrPH） program at Fudan university.

Objective:To observe the effect of early goal directed sedation (EGDS) on cerebral oxygen metabolism in patients with acute brain injury.Methods:A prospective cohort study was conducted. A total of 108 patients with acute brain injury admitted to the intensive care unit (ICU) of the Third Medical Center of the PLA General Hospital from January 2015 to December 2019 were enrolled. According to the patient's condition, dexmedetomidine contraindication and tolerance, and combined with the wishes of patients' families, they were divided into EGDS group and on-demand sedation group. Routine treatments such as surgery, mechanical ventilation, dehydration and reduction of intracranial pressure with mannitol, hemostasis or antiplatelets therapy were given according to the patient's condition. All patients were continuously given sufentanil by intravenous infusion for analgesia. Patients in the EGDS group were sedated by continuously intravenous infusion of dexmedetomidine (0.2-0.7 μg·kg -1·min -1) for 72 consecutive hours. Patients in the on-demand sedation group received intravenous bolus of propofol (0.5-1.0 mg/kg) when treatments were interfered due to agitation. Hemodynamic indexes [heart rate (HR), mean arterial pressure (MAP), cerebral perfusion pressure (CPP), intracranial pressure (ICP)], sedation indexes [bispectral index (BIS)], severity indexes [acute physiology and chronic health evaluation Ⅱ (APACHE Ⅱ) score, Glasgow coma score (GCS)] and cerebral oxygen metabolism indexes [jugular venous blood lactate (Lac), jugular venous oxygen saturation (SjvO 2), cerebral arterial oxygen content (CaO 2), cerebral extraction rate of oxygen (CERO 2), cerebral arteriovenous blood oxygen content difference (a-vDO 2)] were compared between the two groups before sedation and at 24, 48 and 72 hours of sedation. Results:① Among the 108 patients, 3 patients with cerebral hemorrhage received secondary surgery or had worsening of cerebral hernia were excluded. 105 patients were enrolled in the study, including 54 patients in the EGDS group and 51 patients in the on-demand sedation group. There were no statistically significant differences in gender, age, type of craniocerebral injury, GCS score, proportion of mechanical ventilation and operation ratio between the two groups. ② Compared with before sedation, Lac, CERO 2 and a-vDO 2 of both groups gradually reduced over time of sedation while SjvO 2 and CaO 2 were gradually higher. Those changes were more quickly in the EGDS group, Lac, SjO 2, CERO 2 and a-vDO 2 significantly improved at 24 hours of sedation compared with those before sedation. Above indexes at 72 hours of sedation in the EGDS group were obviously better than those in the on-demand sedation group [Lac (mmol/L): 1.81±0.31 vs. 2.19±0.12, SjvO 2: 0.714±0.125 vs. 0.683±0.132, CaO 2 (mL/L): 201.21±15.25 vs. 179.65±14.07, CERO 2: (27.87±3.66)% vs. (33.00±2.58)%, a-vDO 2 (mL/L): 44.32±5.68 vs. 48.57±8.22, all P < 0.05]. ③ Compared with before sedation, HR, MAP and ICP decreased in the two groups over time while CPP, BIS and GCS score showed increasing trend, especially more quickly in the EGDS group, HR at 24 hours of sedation, MAP, CPP, BIS and GCS score at 48 hours significantly improved as compared with those before sedation. Hemodynamics and sedation related parameters and GCS score at 72 hours of sedation in the EGDS group were significantly better than those in the on-demand sedation group [HR (bpm): 70.69±7.80 vs. 79.85±9.77, MAP (mmHg, 1 mmHg = 0.133 kPa): 84.23±8.76 vs. 89.97±9.48, ICP (mmHg): 14.23±8.76 vs. 15.97±9.48, BIS: 60.56±24.58 vs. 56.86±33.44, GCS score: 8.06±3.63 vs. 7.86±2.98, all P < 0.05]. The APACHE Ⅱ scores were significantly reduced at 72 hours of sedation in both groups as compared with those before sedation, while there was no statistical difference between the two groups. Conclusion:Compared with the on-demand sedation, EGDS could reduce cerebral oxygen metabolism, improve the coma degree, and reduce the severity of the disease in patients with acute brain injury.

Objective:To explore the effect of a Chinese medicinal composition ( Xiadanqi) on the prevention of radon exposure induced injuries of lung in vitro and in vivo. Methods:Mice were randomly divided into three groups of blank control group, radon-exposed group alone and radon-exposed group intervened with Chinese medicinal composition. The pathological changes of lung tissues in each group after 120 WLM were observed by HE and Masson staining, and the expressions of α-SMA protein and Vimentin protein in lung tissues were detected by immunohistochemistry staining. The levels of oxidative stress in lung tissue of each group were detected with SOD and MDA kits. At the same time, a radon exposed cell model and a radon exposure + Xiadanqi intervention cell model were constructed using an ecological radon chamber. The cell adhesion abilities of different groups were detected by an adhesion kit. The cell migration ability of each group was determined by the transwell migration experiment. The expression of E-cadherin and Vimentin protein was detected by Western blot. Results:Compared with the radon exposure group, the concentration of MDA was decreased ( t=4.43, P<0.05), the activity of SOD was increased ( t=3.22, P<0.05), and α-SMA and Vimentin protein expressions were decreased ( t=3.08, 7.57, P<0.05) in lung tissue of mice intervened with 2 mg/g Xiadanqi. In vitro, compared with radon exposure group, the migration ability was reduced ( t=4.78, 13.01, P<0.05), the cell adhesion property was enhanced ( t=3.41, 12.55, P<0.05), the expression of E-cadherin protein was increased ( t=2.96, 19.57, P<0.05), and the expression of Vimentin protein was obviously reduced ( t=21.00, 33.32, P<0.05) in radon-exposed cells with the treatment of Chinese medicine (150 μg/ml and 200 μg/ml). Conclusions:The Chinese medicinal composition ( Xiadanqi) has a certain radioprotective effect on radon exposure induced injury by reducing oxidative stress, attenuating EMT and fibrosis, and thus it may be applied as a protective agent for radon induced injury.

Objective:To investigate the value and feasibility of early goal directed sedation (EGDS) in patients with acute brain injury.Methods:A total of 110 patients with acute brain injury who were admitted to intensive care unit (ICU) of the Third Medical Center of the Chinese People's Liberation Army General Hospital from January 2015 to March 2019 were included and randomly divided into EGDS group and standard sedation group (STD) using the random number table. Patients in the EGDS group were sedated by continuous intravenous infusion of dexmedetomidine (initial dose of 0.2 μg·kg -1·min -1) for 72 consecutive hours. Patients in the STD group received intravenous bolus of propofol as appropriate clinically. Richmond agitation-sedation score (RASS) and electroencephalogram bispectral index (BIS) were used to continuously monitor the level of sedation. All patients were given sufentanil for analgesia. Routine treatments such as dehydration and reduction of intracranial pressure with mannitol, hemostasis or antiplatelet therapy were given according to the patients' condition. Vital signs, acute physiology and chronic health evaluation Ⅱ (APACHEⅡ) score, Glasgow coma scale (GCS) score, BIS value, artery blood gas analysis, duration of mechanical ventilation, analgesic dosage and adverse events were recorded in two groups before and 24, 48, and 72 hours after sedation. Results:① Among the 110 patients, patients who received the second surgery due to cerebral hemorrhage, had worsening of cerebral hernia, withdrew during the course of the study, or whose family members abandoned treatment were excluded from the study. Finally, 105 patients were enrolled in the study, including 56 patients in the EGDS group and 49 in the STD group. There was no significant difference in gender, age, types of brain injury, baseline APACHEⅡ or GCS score or rate of mechanical ventilation between the two groups. ② Compared with before sedation, heart rate (HR) significantly decreased till 72 hours after sedation in both groups, and the decrease in the EGDS groups was more obvious as compared with the STD group (bpm: 70.49±7.53 vs. 79.83±9.48, P < 0.05). Besides HR, significant improvement was found in the APACHEⅡ and GCS scores in the STD group at 72 hours of sedation as compared with before sedation, and no significant difference was found in other indicators. Compared with before sedation, arterial partial pressure of carbon dioxide (PaCO 2) was significantly increased from the 24th hour of sedation, mean artery pressure (MAP) was decreased significantly and GCS score, BIS value were increased significantly from the 48th hour of sedation, till 72 hours, which were all improved significantly as compared with the STD group [72-hour PaCO 2 (mmHg, 1 mmHg = 0.133 kPa): 40.30±5.98 vs. 31.57±8.20, 72-hour MAP (mmHg): 85.01±8.26 vs. 89.54±9.41, 72-hour GCS score: 8.62±3.34 vs. 7.89±2.74, 72-hour BIS: 60.87±24.79 vs. 56.68±33.43, all P < 0.05]. APACHEⅡ score was significantly lower only at the 72nd hour of sedation as compared with before sedation in the EGDS group, and no significant difference was found as compared with the STD group (17.10±7.05 vs. 18.90±3.32, P > 0.05). Oxygenation index (PaO 2/FiO 2) was significantly increased only at the 24th hour of sedation in the EGDS group as compared with the STD group (mmHg: 261.05±118.45 vs. 226.45±96.54, P < 0.05). ③ The duration of mechanical ventilation was significantly shorter in the EGDS group than that in the STD group (hours: 20.56±9.03 vs. 27.75±11.23, P < 0.05), and the total administered dose of sufentanil was significantly lower in the EGDS group than that in the STD group (μg: 79.16±26.76 vs. 102.46±35.48, P < 0.05). ④ Compared with the STD group, the incidence of bradycardia in the EGDS group was increased significantly [10.71% (6/56) vs. 6.12% (3/49), P < 0.05], while the incidence of tachycardia was decreased significantly [14.29% (8/56) vs. 38.78% (19/49), P < 0.05], but no significant difference was found in the incidence of hypotension [5.36% (3/56) vs. 4.08% (2/49), P > 0.05]. The incidence of unexpected extubation in the STD group was 4.08% (2/49), which did not occurre in the EGDS group. Conclusion:EGDS can improve the GCS score and BIS value of patients with acute brain injury, suggesting that the EGDS is safe and feasible, which can help improve neurological function in patients with acute brain injury.

Objective To explore the application of clinical teaching unit (CTU) in the process of pediatric resident standardization training. Method From August 2015 to December 2015, trainers in the department of neonatology were randomly divided into the experimental group and the control group; two groups had the same basic training plan and the same training time. The experimental group needed to par-ticipate in CTU activities outside the rule training plan. Trainers of the experimental group were evaluated by the formative evaluation method, and the theoretical assessment and questionnaire survey were carried out at the end of training. SPSS 18.0 was used for t test. Results The ability of clinical thinking of the experimental group trainers in the practice of CTU was improved, and the scoring rate rose from 57.0％ to 85.7％; the test scores of experimental group had different increase, in which case analysis reflected the ability of clinical thinking was significantly higher than the control group (P<0.05). Conclusion CTU can improve the trainers' independent clinical thinking and other abilities, and gradually help them complete the transition from medical students to physicians.

Objective To validate the analytical performance of a cardiac troponin I(cTnI)assay AccuTnI+3 on chemiluminescnet analyzer DXI800 and Access2;and to establish the 99th percentile of cTnI in an apparently healthy Chinese population.Methods The subjects are composed of 1 369 apparently healthy people and 20 acute myocardial infarction(AMI)patients from Wuhan Asian Heart Hospital and Fuwai Hospital from October 2014 to June 2015.The healthy people include 680 males and 689 females;with 340 subjects aged 18-30,674 subjects aged 31-64, and 355 subjects aged ≥65.The detection limits and imprecision of AccuTnI +3 assays were validated according to CLSI EP 15-A2 and EP17-A2 documents;the same samples were analyzed on DXI800 and Access2 to assess the consistency between the two analyzers using Bland Altman plot and Passing-Bablok regression.The correlation between different sample types (lithium heparin plasma, EDTA plasma & serum)were assessed using linear regression analysis.The lithium heparin plasmasamples from 1 369 apparently healthy people were analyzed to calculate the 99th percentile of cTnI.The cTnI concentrations were compared among age and sex groups.The 99th percentile of cTnI were also calculated for each group.The detection rate of cTnI in apparently healthy people was calculated using SPSS23.0.Results The limit of blank(LoB), limit of detection(LoD), and limit of quantification(LoQ)where CV%=10% were 0.007 ng/ml,0.010 ng/ml and 0.016 ng/ml on DXI800;0.008 ng/ml,0.012 ng/ml and 0.026 ng/ml on Access2,respectively.The cTnI measurements on DXI800 and Access2 were consistent and comparable.The cTnI concentrations of lithium heparin plasma, EDTA plasma and serum samples were linearly correlated pairwise: EDTA plasma measuremen t =0.76 heparin plasma measurement, R2=0.999(n=40, P<0.001); serum measuremen t =1.05 heparin plasma measurement,R2=0.996(n=40,P<0.001); serum measuremen t=1.38 EDTA plasma measurement, R2=0.993(n=40,P<0.001).The 99th percentiles were 0.030 ng/ml and 0.035 ng/ml on DXI800 and Access2,respectively,from 1 369 apparently healthy Chinese people.cTnI is significantly higher in elder group than in younger group.The 99th percentiles in 18-30 years old group,31-64 years old group,and≥65 years old group are:0.011 ng/ml,0.029 ng/ml,and 0.035 ng/ml respectively for DXI800;0.023 ng/ml,0.034 ng/ml, and 0.045 ng/ml respectively for Access2.cTnI is significantly higher in men than in women.The 99th percentiles in men and women are: 0.034 ng/ml and 0.032 ng/ml respectively for DXI800;0.043 ng/ml and 0.031 ng/ml respectively for Access2.cTnI was measurable in 62%and 87%of healthy subjects on DXI800 and Access2 systems,respectively.Conclusions The analytical performance of AccuTnI+3 assay fulfills the need of clinical use and the criteria of high-sensitive cardiac troponin assay.