Aim To investigate the dynamic time-course changes in neuronal cytoskeleton after acute ischemia and reperfusion in rats. Methods Reperfusion was performedin rats by blocking the middle cerebralarteryfor 90 min, then therats wereobserved and collected at different time points. The brain damage wasobserved by Nissl staining,and neurobehavioural function was evaluated with neurological deficit score and forelimb placement test. The cellular changes in the alternations of cytoskeletal elements including microtubule associated protein 2 (MAP2) and neurofilament heavy chain (NF-H) were observed by immunohistochemistry staining and Western blot. Impaired axons, dendrites and cytoskeletal alternations were detected by electron microscope. Results Brain damage and neurobehavioural function were gradually aggravated with the prolongation of reperfusion. Brain damage appeared earlier and more severe in striatum than in cortex. Moreover, decreased MAP2-related and increased NF-H-related immunoreactive intensities were found in the ischemic areas. Impaired cytoskeletal arrangement and reduced dense were indicated. Damaged cytoskeletal components such as microtubules and neurofilament arrangement, decreased axonal filament density, and swelled dendrites were observed after cerebral ischemia reperfusion by ultrastructural observations. Conclusions Different brain regions have diverse tolerance to ischemia-reperfusion injury. Major elements of neuronal cytoskeleton show dynamic responses to ischemia and reperfusion, which may further contribute to brain damage and neurological impairment following MCAO and reperfusion.

Nowadays,with the continuous deepening and development of vocational education teaching reform,medical higher vocational education always takes moral education as the fundamental task.As an independent type of education,vocational education should always deepen the integration of industry and education and the integration of science and education.Through the teaching research of"problem chain+course ideological and political case",this study innovates the coordinated education team of drug nursing curriculum,the collaborative education method and the collaborative education evaluation,and improves the teaching effect.

Objective:To identify a novel reassortant H3N2 avian influenza virus using nanopore sequencing technology and analyze its genetic characteristics.Methods:The positive samples of the H3N2 avian influenza virus, collected from the external environment in the farmers' market of Guangzhou, were cultured in chicken embryos. The whole genome was sequenced by targeted amplification and nanopore sequencing technology. The genetic characteristics were analyzed using bioinformatics software.Results:The phylogenetic trees showed that each gene fragment of the strain belonged to the Eurasian evolutionary branch, and the host source was of avian origin. The HA gene was closely related to the origin of the H3N6 virus. The NA gene was closely related to the H3N2 avian influenza virus from 2017 to 2020. The PB1 gene was closely related to the H5N6 avian influenza virus in Guangxi Zhuang Autonomous Region and Fujian Province from 2016 to 2022 and was not related to the PB1 gene of the H5N6 avian influenza epidemic strain in Guangzhou. The other internal gene fragments had complex sources with significant genetic diversity. Molecular characteristics indicated that the strain exhibited the molecular characteristics of a typical low pathogenic avian influenza virus and tended to bind to the receptors of avian origin. On important protein sites related to biological characteristics, this strain had mutations of PB2-L89V, PB1-L473V, NP-A184K, M1-N30D/T215A, and NS1-P42S/N205S.Conclusions:This study identified a novel reassortant H3N2 avian influenza virus by nanopore sequencing, with the PB1 gene derived from the H5N6 avian influenza virus. The virus had a low ability to spread across species, but further exploration was needed to determine whether its pathogenicity to the host was affected.

Objective:To compare and choose the best method for measuring metabolic tumor volume (MTV) of nasal extranodal natural killer/T-cell lymphoma (ENKTL), evaluate the prognostic value of 18F-FDG PET/CT metabolic parameters and clinical staging/scoring systems for patients with nasal ENKTL, and explore the added value of the two combinations for prognostic prediction. Methods:From January 2016 to September 2022, 44 patients (26 males, 18 females; age (47.5±13.6) years) pathologically diagnosed with nasal ENKTL who underwent 18F-FDG PET/CT imaging before treatment in Union Hospital, Tongji Medical College, Huazhong University of Science and Technology were retrospectively collected. SUV 2.5, SUV 4.0 and 41%SUV max were used as thresholds to measure MTV and total lesion glycolysis (TLG), and the consistency was analyzed by Bland-Altman analysis. The ROC curve analysis was used to compare the prognostic efficiency of different methods and determine the best method. The prognostic values of different clinical factors and clinical staging/scoring systems between groups were evaluated by corrected χ2 test. The independent factors were screened by Cox-regression model, and the combined diagnosis model was constructed by logistic regression. Results:Of 44 patients, 6(13.6%) were dead, with the overall survival (OS) of 32.05(11.77, 64.43) months, and the 2-year and 5-year OS rates of 86.6% and 82.5%, respectively. The mortality of different groups in age (≥60 and <60 years), prognostic index of natural killer cell lymphoma (PINK) score (low- and high-risk), and international prognostic index (IPI) score (low- and high-risk) were significantly different ( χ2 values: 5.02, 4.12, 3.88, all P<0.05). The consistency of MTV measured by different thresholds was good. Among them, the MTV measured by threshold of SUV 2.5 had the highest predictive efficiency with the AUC of 0.737. Multivariate analysis showed that MTV (hazard ratio ( HR)=10.488, 95% CI: 1.864-59.026, P=0.008) was the independent influencing factor of OS. By removing other factors, minimization model was obtained, including MTV and PINK score ( P values: 0.006, 0.048). The prediction model of MTV combined with PINK score improved prognostic efficacy with the AUCs of MTV, PINK score and the combination model of 0.781, 0.741 and 0.912, respectively. Conclusions:MTV measured by threshold of SUV 2.5 has better prognostic predictive value. MTV is the independent prognostic factor for OS in nasal ENKTL patients. MTV combined with PINK score has better prognostic value.

Objective:To evaluate the effect of goal-directed fluid therapy (GDFT) on postoperative acute kidney injury (AKI) in elderly patients undergoing long-time abdominal surgery.Methods:The medical records from elderly patients of both sexes, aged ≥ 65 yr, with a duration of operation ≥ 8 h and American Society of Anesthesiologists Physical Status classification Ⅱ or Ⅲ, undergoing elective first abdominal surgery for gastrointestinal tumors at the Shanxi Provincial People′s Hospital from October 1, 2016 to June 30, 2022, were collected from the electronic medical record database. Patients were divided into conventional fluid therapy group (group C) and GDFT group (group G) according to whether GDFT was employed during operation. In group C, blood pressure was maintained ≥90/60 mmHg or mean arterial pressure≥65 mmHg, and urine output more than 30 ml/h. In group G, the stroke volume variation was maintained ≤13%, and cardiac index ≥2.5 L·min -1·m -2. The patient general characteristics, requirement for fluid, urine output, blood loss, requirement for vasoactive agents and abdominal hyperthermic perfusion, and operation time were recorded during operation. The development of AKI within 72 h after operation and development of other complications (pneumonia, anastomotic leakage, surgical site infection, septic shock, arrhythmia) after operation were recorded. The length of hospital stay and 30-day mortality after operation were recorded. Results:A total of 125 patients were included in this study, with 41 patients in group C and 84 patients in group G. Postoperative AKI occurred in 19 patients, with an incidence of 15.2%. Compared with group C, the requirement for colloid, total volume of fluid infused and urine volume were significantly decreased during operation, the requirement for vasoactive agents was increased during operation ( P<0.05), the risk of postoperative AKI was reduced ( OR=0.23, P<0.05), and no significant change was found in the incidence of other postoperative complications, 30-day mortality, and length of hospital stay in group G ( P>0.05). Conclusions:GDFT can reduce the risk of AKI in the elderly patients undergoing long-time abdominal surgery.

To monitor and analyze the molecular variation of the H3N2 influenza virus in Guangzhou during the COVID-19 pandemic, respiratory samples of influenza-like cases from influenza monitoring sentinel hospitals were collected from influenza monitoring sentinel hospitals for virus isolation and whole genome sequencing. The results showed that during COVID-19, there was only one peak of H3N2 influenza in the second quarter of 2022 in Guangzhou (the positive rate was 52.23%), and the epidemic intensity and duration were both higher than those in 2019. The HA gene and NA gene of the epidemic strain in Guangzhou in 2022 belonged to the 3C.2a1b. 2a. 1a. 1 branch, which had a good antigenic site matching with the vaccine strain (A/Cambodia/e0826360/2020) from 2021 to 2022 and had no antigen drift. In 2022 strains, the variation of antigen determinant mainly occurred in the I48T of C region, while no variation occurred in the A, B, D, and E regions. The binding site of the HA protein receptor was consistent with the vaccine strain (A/Cambodia/e0826360/2020). Most of the strains in 2022 carried 13 glycosylation sites on the HA protein, but an outbreak of strains caused a loss of glycosylation sites at 24-NST. In conclusion, the strains that caused the epidemic of H3N2 influenza in Guangzhou in 2022 were not evolved or transmitted from the local strains in 2019 during the COVID-19 pandemic.

Objective:To screen for regulatory cell death and senescence genes with differential prognostic significances in the gastric cancer through bioinformatics methods,and to analyze the effect of phosphodiesterase 1B(PDE1B)on the survival prognosis of the gastric cancer patients.Methods:The gastric cancer gene expression data and clinical data were downloaded from the TCGA Public Database.Fifty gastric cancer patients were randomly selected from the local database,and their clinical informations and paraffin samples,including gastric cancer tissue and adjacent normal tissue,were collected.The R software"limma"package was used to screen differentially expressed genes(DEGs);univariate COX analysis and Kaplan-Meier survival analysis were used to screen DEGs with predictive survival value.The intersection genes affecting the survival prognosis of gastric cancer patients were obtained,and the gene most associated with clinical pathological features PDE1B was screened.The TCGA Database and Kaplan-Meier survival analysis were used to detect the expression levels of PDE1B mRNA in adjacent normal and gastric cancer tissues and their relationships with survival period of the gastric cancer patients.Gene Ontology(GO)functional and Kyoto Encyclopedia of Genes and Genomes(KEGG)pathway enrichment analyses were used to enrich the biological functions of PDE1B.The CIBERSORT algorithm,Tumor Immunity Database(TISIDB),and GSCA online website were used to analyze the correlation between PDE1B and tumor microenvironment,immune characteristic molecules,and drug sensitivity.The real-time fluorescence quantitative PCR(RT-qPCR)method was used to detect the PDE1B mRNA expression levels in gastric cancer tissue and adjacent normal tissue of the gastric cancer patients.Results:A total of 716 DEGs were screened,among which 505 DEGs were upregulated(P<0.05),and 211 DEGs were downregulated(P<0.05).There were 10 intersection genes affecting survival prognosis.The PDE1B mRNA expression level was most closely related to the clinical pathological characteristics of the gastric cancer patients,being associated with age,tumor grade,tumor stage,and tumor T,N,and M stages(P<0.05).Compared with G1-G2,stage Ⅰ,T1-T2,N0,and M0 stage gastric cancer patients,the PDE1B mRNA expression levels in G3-G4,stage Ⅱ-Ⅳ,T3-T4,N1-N3,and M1 stage gastric cancer patients were significantly increased(P<0.05).Compared with adjacent normal tissue,the PDE1B mRNA expression level in gastric cancer tissue was significantly decreased(P<0.05).Compared with the patients with low PDE1B expression,the patients with high PDE1B expression had a significantly lower overall survival rate(P<0.01).PDE1B expression,age,and tumor stage were the risk factors for the prognosis of gastric cancer patients(P<0.05).After adjusting for gender,age,tumor grade,and tumor stage,PDE1B expression was an independent risk factor affecting the prognosis of the gastric cancer patients(P<0.05).PDE1B was mainly enriched in the biological process(BP),such as immunoglobilin production,second-messenger,mediated signaling transduction and calcium ion transport,cellular component(CC),such as Tlymplocytes receptor complex,plasma membrance signaling receptor complex and collagen-containing extracellular matrix,and molecular function(MF),such as antigen binding,glycosaminoglycan binding,and extracellular matrix structural constituents.PDE1B was mainly involved in the pathways such as neuroactive ligand-receptor interaction,calcium signaling pathway,cGMP-PKG signaling pathway,and cytokine-cytokine receptor interaction.PDE1B was positively correlated with regulatory T lymphocytes(r=0.488),myeloid-derived suppressor cells(r=0.474),and macrophages(r=0.617)(P<0.01).Compared with the patients with low PDE1B expression,the patients with high PDE1B expression promoted the significant increase of infiltration of regulatory T lymphocytes,monocytes,and M2 macrophages(P<0.05).The PDE1B mRNA expression levels were positively correlated with the immunosuppressive agents transforming growth factor-β1(TGF-β1)(r=0.535),colony-stimulating factor 1 receptor(CSF1R)(r=0.519),immune activator ectonucleoside triphosphate diphosphohydrolase 1(ENTPD1)(r=0.593),and CXC chemokine ligand 12(CXCL12)(r=0.646)(P<0.01).The gastric cancer tissue with high PDE1B expression was more sensitive to the drugs such as fluorouracil(-0.3

Endodontic diseases are a kind of chronic infectious oral disease.Common endodontic treatment concepts are based on the removal of inflamed or necrotic pulp tissue and the replacement by gutta-percha.However,it is very essential for endodontic treatment to debride the root canal system and prevent the root canal system from bacterial reinfection after root canal therapy(RCT).Recent research,encompassing bacterial etiology and advanced imaging techniques,contributes to our understanding of the root canal system's anatomy intricacies and the technique sensitivity of RCT.Success in RCT hinges on factors like patients,infection severity,root canal anatomy,and treatment techniques.Therefore,improving disease management is a key issue to combat endodontic diseases and cure periapical lesions.The clinical difficulty assessment system of RCT is established based on patient conditions,tooth conditions,root canal configuration,and root canal needing retreatment,and emphasizes pre-treatment risk assessment for optimal outcomes.The findings suggest that the presence of risk factors may correlate with the challenge of achieving the high standard required for RCT.These insights contribute not only to improve education but also aid practitioners in treatment planning and referral decision-making within the field of endodontics.

Objective To investigate the correlation between the level of N-terminal pro-Brain natriuretic peptide(NT-proBNP)and cardiorespiratory fitness following acute exposure to high altitude.Methods Forty-six subjects were recruited from the Second Affiliated Hospital of Army Medical University in June 2022,including 19 males and 27 females.After completing cardiopulmonary exercise test(CPET),serological detection of myocardial cell-related markers,and multiple metabolites at a plain altitude(300 meters above sea level),all subjects flew to a high-altitude location(3900 meters above sea level).Biomarker testing and CPET were repeated on the second and third days after arrival at high altitude.Changes in serum biomarker and key CPET indicators before and after rapid ascent to high altitude were compared,and the correlation between serum levels of various myocardial cell-related markers and metabolites and high altitude cardiorespiratory fitness was analyzed.Results Compared with the plain altitude,there was a significant decrease in maximal oxygen uptake after rapid ascent to high altitude[(25.41±6.20)ml/(kg.min)vs.(30.17±5.01)ml/(kg.min),P<0.001].Serum levels of NT-proBNP,Epinephrine(E),plasma renin activity(PRA),angiotensin Ⅱ(Ang Ⅱ),angiotensin-converting enzyme 2(ACE2)and leptin(LEP)significantly increased,with all differences being statistically significant(P<0.05)after acute high altitude exposure.In contrast,no statistically significant differences were observed for creatine kinase MB(CK-MB),cardiac troponin I(cTnI),myoglobin(Myo)and norepinephrine(NE)(P>0.05).Correlation analysis showed a significant negative correlation between NT-proBNP at plain altitude(r=-0.768,P<0.001)and at high altitude(r=-0.791,P<0.001)with maximal oxygen uptake at high altitude.Multivariate linear regression analysis indicated that maximal oxygen uptake at plain altitude(t=2.069,P=0.045),NT-proBNP at plain altitude(t=-2.436,P=0.020)and at high altitude(t=-3.578,P=0.001)were independent influencing factors of cardiorespiratory fitness at high altitude.Conclusion Cardiorespiratory fitness significantly decreases after rapid ascent to high altitude,and the baseline NT-proBNP level at plain altitude is closely related to cardiorespiratory fitness at high altitude,making it a potential predictor indicator for high altitude cardiorespiratory fitness.

Objective To describe the changing trend and related factors of prevalence rates of healthcare-associa-ted infection(HAI)in a tertiary hospital in the past 10 years,and analyze the influencing factors for HAI.Methods A cross-sectional survey on HAI was conducted for 10 consecutive years from 2013 to 2022(one day was selected as the survey day each year),data were collected.The distribution and related factors of prevalence rates of HAI were analyzed by trend-x2 test and Pearson correlation coefficient.Multivariate logistic regression and multilayer percep-tron(MLP)models were constructed to analyze the independent effect and significance of factors.Results From 2013 to 2022,the prevalence rates of HAI ranged from 4.66％to 8.07％in this hospital,showing a linear upward trend.The proportions of ICU patients and utilization rate of central venous catheters within 2 days before the sur-vey showed linear upward trends,while the proportion of patients with urinary catheters within 2 days before the survey and proportion of patients undergoing surgery within 30 days before the survey decreased.The MLP model revealed that the top 3 important factors for HAI were length of hospital stay＞10 days,admission in ICU,and in-dwelling central venous catheters within 2 days before the survey.Multivariate logistic regression model indicated that length of hospital stay＞10 days,indwelling central venous catheters or urinary catheters within 2 days before the survey,surgery within 30 days before the survey,and admission in ICU were independent influencing factors for HAI.Conclusion The incidence of HAI in this hospital presents a linear increase in recent 10 years,the causes should be further analyzed and the direction of intervention should be determined through targeted surveillance.Adopting trend test statistical analysis method,logistic regression,MLP multi-factor model can further explore the data value of HAI prevalence survey.