Objective To study the effect of interleukin-15(IL-15)on lipopolysaccharide(LPS)-induced apoptosis of septic cardiomyocytes and its related mechanism.Methods H9C2 cells were divided into control group(H9C2 cells in conventional culture),apoptosis group(LPS-induced myocardial cell injury model was established),and intervention group(10 ng/ml recombinant rat IL-15 was used in myocardial H9C2 cell injury model for 6 h).The effects of IL-15 on H9C2 cell proliferation and apoptosis were detected by methyl thiazolyl tetrazolium(MTT)assay and flow cytometry,the level of mitochondrial membrane potential was detected by staining of tetramethylrhodamine ethyl ester(TMRE).The sepsis mouse model was established by intraperitoneal injection of 10 mg/kg LPS,and 100 μl of normal saline containing 100 μg/ml IL-15 was injected intraperitoneally.HE staining was used to evaluate the pathological injury of mouse myocardium.The indexes of oxidative stress in mouse myocardium were detected by ELISA.The effects of IL-15 on the expression of heme oxygenase 1(HO-1)and NF-E2-related factor 2(Nrf2)mRNAs and proteins in myocardium of mouse sepsis model were detected by real-time fluorescence quantitative PCR and Western bloting.Results The apoptosis rate of H9C2 cells in the apoptosis group was significantly higher than that in the control group(47.9%±5.1%vs.2.1%±0.3%,P<0.05).The apoptosis rate of H9C2 cells in the intervention group was 20.7%±2.7%,which was significantly lower than that in the apoptosis group(P<0.05).LPS could significantly inhibit the proliferation of myocardial cells,while IL-15 could inhibit LPS-induced decrease in myocardial cell viability(P<0.05).The relative mitochondrial membrane potential of myocardial H9C2 cells in the apoptosis group was significantly lower than that in the control group(2.6±4.6 vs.7.4±5.2,P<0.05).The relative mitochondrial membrane potential of myocardial H9C2 cells in the intervention group was 4.2±4.9,which was significantly higher than that in the apoptosis group(P<0.05).LPS significantly enhanced the loss of mitochondrial membrane potential of myocardial H9C2 cells,and IL-15 intervention weakened the loss of mitochondrial membrane potential of H9C2 cells induced by LPS(P<0.05).HE staining revealed obvious myocardial tissue damage and inflammatory cell infiltration in mouse sepsis model.IL-15 ameliorated LPS-induced myocardial injury in mice.The expression levels of superoxide dismutase(SOD)and total antioxidant capacity(T-AOC)in myocardium of sepsis mice were significantly lower than those in normal mice,while the expression level of malondialdehyde(MDA)in sepsis mice was significantly higher than that in normal mice(P<0.05).After IL-15 intervention,the expression of SOD and T-AOC in myocardium of sepsis mice was increased,and the expression of MDA was decreased(P<0.05).The mRNA and protein expression levels of HO-1 and Nrf2 were low in myocardium of normal mice.The mRNA and protein expression levels of HO-1 and Nrf2 in myocardium of sepsis mice were significantly higher than those in normal mice(P<0.05).After IL-15 intervention,the mRNA and protein expression levels of HO-1 and Nrf2 were significantly increased in myocardium of sepsis mice(P<0.05).Conclusion IL-15 can protect cardiomyocyte apoptosis induced by sepsis and decrease myocardial injury in sepsis mice.The mechanism may be related to the activation of HO-1/Nrf2 signaling pathway and the inhibition of myocardial oxidative stress in septic mice.

Objective:To explore the application of scenario simulation and rapid film reading training in the standardization of cervical vertebra DR examination in radiology department.Methods:Using the method of scene simulation in the examination room to take DR films of cervical vertebra, two senior technicians in charge evaluated and guided the deficiencies of junior technicians from the aspects of patient check, exposure conditions, body position placement, film printing, inspection safety and radiation protection. Every morning, DR images of cervical vertebra were randomly selected and read quickly, and the junior technicians should quickly browse the images within one minute and make quality control evaluation. Then the senior technician in charge pointed out the shortcomings of the evaluation and related improvement methods. After that, the technical specification manual of cervical vertebra DR was compiled based on the deficiencies and problems found by each technician, and 200 patients aged 18-55 years, without abnormal movement and no internal fixation before and after the establishment of standardization were randomly selected in group A (before standardization) and group B (after standardization). The image quality and repetition projection rate of group A and group B before and after the standardization were compared. SPSS 25.0 was used to analyze the data.Results:The image quality score of group B (8.83±0.33) was higher than that of group A (8.45±0.30), and the repetition projection rate of group B (2%) was lower than that of group A (9%), with statistical significance ( P<0.05). Conclusion:Through the training mode of rapid film reading and scenario simulation, the standardization of cervical vertebra DR examination technology suitable for the situation of the department has been established, which effectively solves the problem of abstraction in the technical teaching of radiology department. The standardization establishment plays an important role in standardized training, for which, the technicians can quickly grasp the work process of the department and the corresponding examination technology during participating in the standardization establishment and training process.

Objective:To establish autoverification rules for coagulation tests in multicenter cooperative units, in order to reduce workload for manual review of suspected results and shorten turnaround time (TAT) of test reports, while ensure the accuracy of results.Methods:A total of 14 394 blood samples were collected from fourteen hospitals during December 2019 to March 2020. These samples included: Rules Establishment Group 11 230 cases, including 1 182 cases for Delta check rules; Rules Validation Group 3 164 cases, including 487cases for Delta check; Clinical Application Trial Group 77 269 cases. Samples were analyzed for coagulation tests using Sysmex CS series automatic coagulation analyzers, and the clinical information, instrument parameters, test results, clinical diagnosis, medication history of anticoagulant and other relative results such as HCT, TG, TBIL, DBIL were summarized; on the basis of historical data, the 2.5 and 97.5 percentile of all data arranged from low to high were initially accumulated; on the basis of clinical suggestions, critical values and specific drug use as well as relative guidelines, autoverification rules and limits were established.The rules were then input into middleware, in which Stage I/Stage II validation was done. Positive coincidence, negative coincidence, false negative, false positive, autoverification pass rate, passing accuracy (coincidence of autoverification and manual verification) were calculated. Autoverification rules underwent trial application in coagulation results reports.Results:(1) The autoverification algorisms involve 33 rules regarding PT/INR, APTT, FBG, D-dimer, FDP,Delta check, reaction curve and sample abnormalities; (2)Autoverification Establishment Group showed autoverification pass rate was 68.42% (7 684/11 230), the false negative rate was 0%(0/11230), coincidence of autoverification and manual verification was 98.51%(11 063/11 230), in which positive coincidence and negative coincidence were respectively 30.09% (3 379/11 230) and 68.42%(7 684/11 230); Autoverification Validation Group showed autoverification pass rate was 60.37%(1 910/3 164), the false negative rate was 0%(0/11 230), coincidence of autoverification and manual verification was 97.79%(3 094/3 164), in which positive coincidence and negative coincidence were respectively 37.42%(1 184/3 164) and 60.37%(1 910/3 164); (3) Trialed implementation of these autoverification rules on 77 269 coagulation samples showed that the average TAT shortened by 8.5 min-83.1 min.Conclusions:This study established 33 autoverification rules in coagulation tests. Validation showedthese rules could ensure test quality while shortening TAT and lighten manual workload.

Objective To investigate the immunization effect of influenza A/H1N1 vaccine in health care workers (HCW) in Inner Mongolia Greater Khingan Mountains area. Methods Five hundred and five HCW who received A/H1N1 influenza vaccination (immunized group) and 129 staffs who didn't receive the vaccination (unimmunized group) were randomly sampled for semiquantitative testing of serum H1N1 antibody (IgG) levels by enzyme-linked immunosorbent assay (ELISA).Results were analyzed and stratified by age, sex, occupation and the time interval between the time of vaccination and serum sample collection. The antibody positive rates of the two groups were compared by x2test. Results There were 401 (79. 4%) HCW whose H1N1 antibody were positive and 50 (9.9%) whose antibody were weak positive among 505 immunized HCW. While among 129 unimmunized HCW, there were 59 (45.7%) whose antibody were positive and 15 (11.6%) whose antibody were weak positive. The seroconversion rates of specific antibody were not significantly different among the different age groups after receiving A/H1N1 influenza vaccine (P＞ 0.05).However, there were statistical differences of the seroconversion rates among different sex groups (men 95.7% vs women 87.4% in immunized group, x2=6.40, P＜0.05; and men 73.3% vs women 52.5% in unimmunized group, x2 =4.07, P＜0.05) and different occupation groups (doctor 86.0% vs nurse 94.5% in immunized group, x2 = 9. 16, P＜0.01; and doctor 43. 8% vs nurse 75.0% in unimmunized group, x2=12.61, P＜0.01 ). The seroconversion rate was 81.5% after 80 to 89 days of vaccination, which was significantly lower than those after 30 to 39, 50 to 59 days and 60 to 69 days of vaccination, which was 100.0%, 94.7% and 93.6%, respectively (x2 =3.96, P ＜0.05; x2=7.15, P ＜0. 01; x2 = 9. 98, P＜0. 01). Conclusions A/H1N1 influenza vaccination can induce effective immune response in HCW in Greater Khingan Mountains area of Inner Mongolia. However,the level of specific antibody significantly reduces after 80 to 89 days of vaccination.