ObjectiveTo establish a new noninvasive， simple， and convenient clinical predictive model by identifying independent predictive factors for rebleeding after endoscopic therapy in cirrhotic patients with esophagogastric variceal bleeding （EGVB）， and to provide a basis for individualized risk assessment and development of clinical intervention strategies. MethodsCirrhotic patients with EGVB who were diagnosed and treated in The First Affiliated Hospital of Xi’an Medical University from September 2018 to October 2023 were enrolled as subjects， and according to whether the patient experienced rebleeding within 1 year after endoscopic therapy， they were divided into rebleeding group with 93 patients and non-rebleeding group with 84 patients. Clinical data were collected and analyzed. The independent samples t-test was used for comparison of normally distributed continuous data between two groups， and the Mann-Whitney U test was used for comparison of non-normally distributed continuous data between two groups； the chi-square test was used for comparison of categorical data between two groups. A Logistic model was established based on the results of the univariate and multivariate analyses， and the receiver operating characteristic （ROC） curve and the area under the ROC curve （AUC） were used to assess the accuracy of the model. R software was used to visualize the model by plotting a nomogram， and the Bootstrap method was used for internal validation of the model. ResultsThe multivariate analysis showed that red blood cell count （RBC）， cholinesterase （ChE）， alkaline phosphatase （ALP）， albumin （Alb）， thrombin time （TT）， portal vein trunk diameter， sequential therapy， and primary prevention were independent predictive factors for rebleeding. Based on the results of the multivariate analysis， a logistic model was established as logit（P）=-0.805-1.978×（RBC）+0.001×（ChE）-0.020×（ALP）-0.314×（Alb）+0.567×（TT）+0.428×（portal vein trunk diameter）-2.303×［sequential therapy （yes=1， no=0）］-2.368×［primary prevention （yes=1， no=0）］. The logistic model （AUC=0.928， 95% confidence interval ［CI］： 0.893—0.964， P<0.001） had a better performance in predicting rebleeding than MELD score （AUC=0.603， 95%CI： 0.520—0.687， P=0.003）， Child-Pugh class （AUC=0.650， 95%CI： 0.578—0.722， P=0.001）， and FIB-4 index （AUC=0.587， 95%CI： 0.503—0.671， P=0.045）. The model had an optimal cut-off value of 0.607， a sensitivity of 0.817， and a specificity of 0.817. Internal validation confirmed that the model had good predictive performance and accuracy. ConclusionSequential therapy， implementation of primary prevention， an increase in RBC， and an increase in Alb are protective factors against rebleeding， while prolonged TT and widened main portal vein diameter are risk factors. The logistic model based on these independent predictive factors can predict rebleeding and thus holds promise for clinical application.

Objective To explore the clinical efficacy of different ligation methods in laparoscopic radi-cal resection of rectal cancer and sigmoid colon cancer and the influencing factors of anastomotic leakage.Methods A total of 82 patients who underwent laparoscopic radical resection of rectal cancer and sigmoid co-lon cancer in this hospital from December 2022 to December 2023 were selected and divided into the low-liga-tion group(n=42)and the high-ligation group(n=40)according to different surgical methods.The inferior mesenteric artery(IMA)classification,IMA length,operation time,intraoperative blood loss,total number of lymph node dissections,number of lymph node dissections in group 253,postoperative hospital stay,exhaust time,incidence of urinary retention,incidence of anastomotic leakage,and incidence of preventive stoma were compared between the two groups.Univariate and multivariate logistic regression analyses were conducted to analyze the influencing factors of anastomotic leakage in patients undergoing radical resection of rectal cancer and sigmoid colon cancer.Results There was no statistically significant difference in IMA length,IMA classi-fication proportion,operation time,intraoperative blood loss,the total number of lymph node dissections,the number of lymph node dissections in group 253,and the postoperative hospital stay between the two groups(P>0.05).Compared with the high-ligation group,the low-ligation group had a shorter exhaust time,lower incidence of anastomotic leakage and preventive ostomy,the differences were statistically significant(P<0.05).Anastomotic leakage occurred in 7 patients.Univariate analysis showed that whether left colic artery(LCA)was preserved,tumor location,presence of underlying diseases,and preventive stoma were associated with anastomotic leakage in patients undergoing radical resection of rectal cancer and sigmoid colon cancer(P<0.05).Multivariate logistics analysis showed that whether LCA was preserved,tumor location,presence of underlying diseases,and presence of preventive stoma were not influencing factors for anastomotic leakage in patients undergoing radical resection of rectal cancer or sigmoid colon cancer(P>0.05).Conclusion In laparoscopic radical resection of rectal and sigmoid colon cancer,the clinical efficacy of preserving LCA is com-parable to that of not preserving LCA,and it can reduce the risk of anastomotic leakage and the probability of preventive stoma,promoting the early recovery of intestinal function.

ObjectiveTo explore the possible mechanism of Changweiqing （肠胃清） in the treatment of colorectal cancer. MethodsHCT 116 cancer cells were used to prepare intestinal cancer cells with silenced polypyrimidine region binding protein 3 （PTBP3） gene and stably transfected cells with overexpressed PTBP3 gene. Stably transfected cells with silenced PTBP3， stably transfected cells with overexpressed PTBP3 and untransfected cancer cells were injected into the armpit of 72 nude mice to construct three different subcutaneous transplanted tumor models of colorectal cancer cells， including the silenced model， the overexpressed model and the control model， with 24 mice per model. Mice of each transplanted tumor modelwere randomly divided into Changweiqing （CWQ） group， oxaliplatin （OXA） group and normal saline （NS） group， with 8 mice in each group. The CWQ groups were given intragastric administration of 35.9625 g/kg of Changweiqing oral liquid and were intraperitoneally injected with 0.2ml of normal saline； the NS groups were given 0.5ml of normal saline by gavage， and intraperitoneal injection of 0.2ml of normal saline； the OXA groups were intraperitoneally injected with 5 mg/kg （0.2 ml） of oxaliplatin and given 0.5ml of normal saline by gavage. Each group was given intragastric administration once a day and intraperitoneal injection three times a week. After 31 days， the weight of subcutaneous tumors in each group was measured， and the tumor inhibition rate of the groups in each model were measured. Immunohistochemistry and other methods were used to detect the expression level of cell proliferation cell nuclear antigen Ki67 and apoptosis index. Real-time PCR and Western Blot were used to detect mRNA and protein expressions of PTBP3， signal transducer and activator of transcription 3 （STAT3） splicing isoform α （STAT3α）， STAT3 splicing isoform β （STAT3β）， B-cell lymphoma/leukemia-2 （Bcl-2） splicing isoform α （Bcl-2α）， and Bcl-2 splicing isoform β （Bcl-2β） in subcutaneous tumor cells in each group. ResultsFor all three transplanted tumor models， the weight of the subcutaneous tumors and Ki67 expression level of subcutaneous tumor tissue in all CWQ groups and OXA groups were lower than those of the corresponding NS groups， while the apoptosis level were higher （P＜0.05 or P＜0.01）. The mRNA and protein expressions of PTBP3， STAT3α， and Bcl-2α in the subcutaneous tumor tissues of the silenced model CWQ group and the overexpressed model CWQ group were lower than those of the corresponding NS groups， while the mRNA and protein expression levels of STAT3β and Bcl-2β were higher （P＜0.05 or P＜0.01）. All there groups of silenced model had lower subcutaneous tumor weight， Ki67 expression level， and mRNA and protein expression levels of PTBP3， STAT3α， and Bcl-2α in subcutaneous tumor tissue， as well as higher apoptosis level and mRNA and protein expression levels of STAT3β and Bcl-2β than those in all groups of control model； all groups of overexpressed model had higher subcutaneous tumor weight， Ki67 expression level， and mRNA and protein expression levels of PTBP3， STAT3α， and Bcl-2α ， while lower apoptosis level and mRNA and protein expression levels of STAT3β and Bcl-2β than those in all control model groups （P＜0.05 or P＜0.01）. In the control model， compared with the NS group， The tumor inhibition rate of all OXA groups was higher than that of corresponding CWQ groups， respectively. Compared to that of each control model group， the tumor inhibition rate was positive value of each silenced model group， and negative value of each overexpressed model group. ConclusionPTBP3 can promote the proliferation and inhibit apoptosis of intestinal cancer cells， upregulate the expression of STAT3α and Bcl-2α， and downregulate the expression of STAT3β and Bcl-2β in intestinal cancer cells. The meachnism of action of Changweiqing in the treatment of colorectal cancer maybe related to the inhibition of PTBP3， and regulation of the expression of STAT3α， STAT3β， Bcl-2α， and Bcl-2β.

Objective:To explore the application of the 4R problem analysis method combined with reverse teaching in nursing teaching in the pediatric operating room.Methods:In this study, 480 nursing students who were assigned to the operating room of Hunan Children's Hospital for internship from August 2020 to August 2022 were selected as research subjects. They were divided into control group and observation group in order of admission, with 240 students in each group. The control group received traditional teaching, while the observation group received the 4R problem analysis method combined with reverse teaching. At the end of the internship, the two groups were compared for comprehensive ability assessment scores, recognition of nursing teaching, and degree of satisfaction with the teaching. The t-test and χ2 test were performed using SPSS 22.0. Results:The scores of theoretical knowledge, basic nursing skills, specialized nursing skills in the operating room, and comprehensive nursing skill assessment of the observation group were significantly higher than those of the control group ( P<0.05). The recognition of nursing teaching among the nursing interns in the observation group was significantly higher than that in the control group ( P<0.001). There was a significant difference in the degree of satisfaction with the teaching between the two groups of nursing interns ( χ2=118.35, P<0.001). Conclusions:The 4R problem analysis method combined with reverse teaching can effectively improve the nursing teaching quality and the degree of satisfaction with the teaching among nursing interns in the pediatric operating room, enabling them to better grasp theoretical and practical skills.

AIM:To observe the effect of folic acid(FA)on C2C12 myoblast proliferation and differentia-tion,and to explore its mechanism.METHODS:During the proliferation stage,C2C12 myoblasts were treated with vari-ous concentrations of FA(0,2.5,5,10 and 20 μmol/L).The cell status was observed under a microscope,cell viability was detected using the MTT method,and cell proliferation was assessed using the EdU method.In the differentiation stage,C2C12 cells were divided into control(Ctrl)group(0 μmol/L FA)and FA group(10 μmol/L FA).On day 2 or 4 of differentiation,immunofluorescence staining and Western blot were employed to detect the expression of myoblast differen-tiation-related proteins,myoblast determination protein 1(MyoD),myogenin(MyoG)and myosin heavy chain(MyHC).The myotubule formation in each group was analyzed.On day 4 of differentiation,C2C12 cells were treated with FA for 0,1,3 and 6 h,and the protein levels of p-JNK,JNK,p-p38 MAPK and p38 MAPK at each time point were detected by Western blot.Additionally,C2C12 cells after 4-day differentiation were divided into Ctrl group,FA group,FA+ SP600125(specific inhibitor of JNK)group,and FA+SB203580(specific inhibitor of p38)group.The cells in FA+ SP600125 and FA+SB203580 groups were treated with 10 μmol/L SP600125 or SB203580 for 1 h,followed by treatment with 10 μmol/L FA for 24 h.The cells in FA group were treated with 10 μmol/L FA for 24 h,while the cells in Ctrl group were left untreated.The protein levels of p-JNK,JNK,p-p38 MAPK,p38 MAPK and MyHC were detected by Western blot.RESULTS:(1)Compared with 0 μmol/L FA group,the number of the cells in other concentration groups in-creased,cell viability was raised(P＜0.05 or P＜0.01),and the rate of EdU positive cells increased(P＜0.05).(2)Com-pared with Ctrl group,the expression levels of MyoD,MyoG and MyHC in FA group were increased(P＜0.05),and the myotube fusion index was raised(P＜0.05 or P＜0.01).(3)Compared with 0 h group,the ratios of p-JNK/JNK and p-p38 MAPK/p38 MAPK were elevated after FA treatment for 1,3 and 6 h(P＜0.05 or P＜0.01),and showed a trend of gradual increase with the extension of treatment time.(4)After FA treatment,the ratios of p-JNK/JNK and p-p38 MAPK/p38 MAPK,and the expression of MyHC were elevated(P＜0.01).Treatment with SP600125 decreased the ratio of p-JNK/JNK and the expression of MyHC(P＜0.05),while SB203580 intervention cut down the ratio of p-p38 MAPK/p38 MAPK and the expression of MyHC(P＜0.05 or P＜0.01).CONCLUSION:Folic acid can promote the differentiation of C2C12 myoblasts by activating the JNK/p38 MAPK signaling pathway.

Objective To compare the existing evaluation methods of sample's representativeness and provide reference for selection of sample representativeness evaluation methods in clinical research.Methods Simulate the target population of lung cancer patients and select samples with different sample sizes and different degrees of deviation based on the distribution of traits of lung cancer patients in China and the actual situation of sample screening in domestic clinical studies.Calculate sample representativeness using the existing evaluation methods of sample's representativeness,and calculate estimation deviation(bias).By constructing the correlation model between the measured value of each method and bias,analyze the accuracy and stability of each method.Results The overall structural variance rate RV1、RV2、C-statistic based on propensity score、SGCR and K-S distance could well measure the degrees of deviation of different samples.Under different sample sizes,the R2 of RV2 and RV1 are greater than 0.90,and R2 of C-Statistic、SGCR and K-S distance were greater than 0.80.Conclusion The overall structural variance rate is more accurate and stable because the traits weight is taken into account.In particular,RV2 can better measure the representativeness of samples with different degrees of deviation and accurately reflect the estimation deviation.However,when it is difficult to obtain the feature importance information,the reliability of the representative measurement of SGCR as well as C-statistic and K-S distance used the propensity score-based method are acceptable.

Background and purpose:It is still a great challenge to clarify the signal molecules that mediate the communication between cancer-associated fibroblasts(CAFs)and tumor cells.These signal molecules are very important for cancer metastasis.The purpose of this study was to explore the communication mechanism of pleckstrin-2/miR-196a signal axis mediated by lung cancer cells in tumor microenvironment.Methods:Human lung adenocarcinoma cell line H1299 and human embryonic lung cell MRC-5 were selected as the research objects.H1299 cells were transfected with lentivirus(PLEK2)expressing PLEK2 and Vector control,and exosomes(Vector_exo,PLEK2_exo)were isolated after 24 h of transfection.MRC-5 cells were transfected with miR-196a mimetic or inhibitor.The expressions of PLEK2 and epithelial-mesenchymal transition(EMT)-related proteins were analyzed by Western blot.The expression of miR-196a was analyzed by polymerase chain reaction(PCR),and the metastasis and invasion ability of cells were determined by transwell assay.Six female BALB/c-nu mice were randomly divided into Vector group and PLEK2 group,with 3 mice in each group.Mice in each group were injected with H1299 cells transfected with Vector or PLEK2 through the tail vein.After 4 weeks,lung tissue was taken out for H-E staining and immunohistochemical staining to analyze the expression of α-smooth muscle actin(α-SMA).All animal experiments were approved by the ethics committee of First Hospital of Changsha City(Changsha Hospital,Xiangya School of Medicine,Central South University)(ethics number:EI-2021-103).Results:Compared with the Vector group,the number of pulmonary metastatic nodules and the expression of α-SMA in metastatic cancer in PLEK2 group increased significantly(P＜0.001).Compared with Vector group,the expression level of miR-196a in H1229 cells in PLEK2 group increased significantly(P＜0.05),and the expression level of miR-196a was significantly higher in PLEK2_exo than in Vector_exo(P＜0.05).Compared with Vector_exo group,the expression levels of miR-196a,α-SMA and fibroblast activation protein(FAP)in MRC-5 cells in PLEK2_exo group increased significantly(P＜0.05).Compared with the negative control(NC),the expression levels of α-SMA and FAP in MRC-5 cells transfected with miR-196a increased significantly(P＜0.05).On the contrary,by transfection with miR-196a inhibitors(si-miR-196a#1 and si-miR-196a#),the expression levels of α-SMA and FAP were significantly inhibited(P＜0.05).Compared with NC-CM group,the number of metastatic cells,invasive cells and the expression of vimentin in miR-196a-CM group increased significantly(P＜0.001),and the expression of E-cadherin decreased significantly(P＜0.001).In addition,compared with Vector_exo-CM group,PLEK2_exo-CM group had significant increase in number of metastatic and invasive cells and the expression of vimentin(P＜0.01),and significant decrease in the expression of E-cadherin(P＜0.001).Conclusion:Upregulation of PLEK2 can enhance the level of exosomes miR-196a derived from lung cancer cells,thereby promoting the activation of CAFs.The activated CAFs can further enhance the invasive ability of lung cancer cells.

Objective To systematically evaluate the prevalence of frailty in patients with rheumatoid arthritis (RA). Methods A systematic search method for observational studies on the prevalence of frailty in patients with RA was conducted, and literature screening, data extraction as well as evaluation of literature quality were performed in strict accordance with evidence-based medical research methodology. Meta-analysis and Egger's linear regression analysis were performed by Stata 16.0 software. Results Twenty-six literatures were included in the study, including a total sample size of 22, 547 patients. The results of the analysis showed that the total prevalence of frailty in patients with RA was 36% (95%CI, 0.26 to 0.45, P < 0.001), and the prevalence of pre-frailty was 43% (95%CI, 0.36 to 0.50, P < 0.001). The results of subgroup analysis showed that the incidence of frailty was higher in RA patients with features of female, age over 60 years old, hospitalization, living in European region and evaluation with multi-dimensional comprehensive frailty assessment tool and the specific RA frailty assessment tool. Conclusion The overall incidence of frailty and pre-frailty in RA patients is high, and there are differences in the incidence of frailty among patients with different ages, genders, environments, regions, and types of assessment tools.

During coronavirus disease 2019 epidemic, the treatment of severe trauma has been impacted. The Consensus on emergency surgery and infection prevention and control for severe trauma patients with 2019 novel corona virus pneumonia was published online on February 12, 2020, providing a strong guidance for the emergency treatment of severe trauma and the self-protection of medical staffs in the early stage of the epidemic. With the Joint Prevention and Control Mechanism of the State Council renaming "novel coronavirus pneumonia" to "novel coronavirus infection" and the infection being managed with measures against class B infectious diseases since January 8, 2023, the consensus published in 2020 is no longer applicable to the emergency treatment of severe trauma in the new stage of epidemic prevention and control. In this context, led by the Chinese Traumatology Association, Chinese Trauma Surgeon Association, Trauma Medicine Branch of Chinese International Exchange and Promotive Association for Medical and Health Care, and Editorial Board of Chinese Journal of Traumatology, the Chinese expert consensus on emergency surgery for severe trauma and infection prevention during coronavirus disease 2019 epidemic ( version 2023) is formulated to ensure the effectiveness and safety in the treatment of severe trauma in the new stage. Based on the policy of the Joint Prevention and Control Mechanism of the State Council and by using evidence-based medical evidence as well as Delphi expert consultation and voting, 16 recommendations are put forward from the four aspects of the related definitions, infection prevention, preoperative assessment and preparation, emergency operation and postoperative management, hoping to provide a reference for severe trauma care in the new stage of the epidemic prevention and control.

In order to respond to the call of the National Health Commission to implement day surgery, this study elaborated the work process and the efficiency improvement strategies of hip and knee joint replacement in ambulatory surgery centre in foreign countries. It summarized the good points in process, summarized the management experience, combined with domestic conditions. It explored the key steps and matters needing attention related to the ambulatory surgery center of hip and knee joint replacement to provide reference for operating efficiency and speeding up the process of Enhanced Rehabilitation After Surgery in orthopedic field.