Objective:To investigate the anti-tumor effect of Hyperoside.Methods: Human γδT cells were amplified by isopentenyl pyrophosphate from peripheral blood cells.The proliferation capacity of γδT cells was measured with CCK-8 assay after treated with different concentrations of Hyperoside.Cytotoxicity of γδT cells was detected with LDH assay , and the expression of granzyme,perforin CD107a and IFN-γonγδT cells were measured by flow cytometry before and after treatment.Results: Hyperoside could significantly stimulate the proliferation of γδT cells at the concentration of 3.13-12.5 μg/ml.Cytotoxicity and expression of granzyme,perforin and IFN-γofγδT cells were increased after treatment.Conclusion:Hyperoside could enhance cytotoxicity of humanγδT cells through up-regulation of granzyme ,perforin CD107 a and IFN-γexpression.

Objective To investigate de-escalation of empiric broad-spectrum antibiotics treatment for patients in intensive care unit (ICU).Methods Data of the patients discharged from ICU in the Second Affiliated Hospital of Zhejiang University from July 1 to December 31 of 2012 and from July 1 to December 31 of 2013 were retrospectively reviewed.Patients with initial use of empirical broad-spectrum antibiotics within 3 d after ICU admission were included in the study.Clinical data including status of infection,the initial empiric antimicrobial therapy,pathogens culture and adjustment of antibiotics in 5 days were analyzed.Results A total of 841 patients were discharged from ICU during the study periods and antibiotics were used in 786 (93.5％) patients.Among 786 patients,389 (49.5％) were treated empirically with broad-spectrum antibiotics,but only 269 (69.2％) had evidences of bacterial infections.Of the 389 patients with empiric antibiotics use,de-escalation of antibiotics was applied only in 6 (1.54％) patients within 5 days after the initiation of treatment.In 269 patients with evidence of infection,specimen sampling and culture were performed in 248 (92.2％) patients within 3 days,among which 165 samples were positive,and the clinical isolates were mainly multi-drug resistant gram negative bacilli and colonized bacteria in oropharyngeal cavity.De-escalation was applied only in 4 (1.49％,4/269) patients with evidences of bacterial infections.Conclusion Broad-spectrum antibiotics as initial empiric therapy is common for patients in ICU,however de-escalation of empiric therapy is rarely applied even in patients with positive results in pathogen isolation and culture.

Objective To explore specimen sampling for microbial culture in ICU patients with documented infections in order to offer clinical evidence for improving the rational use of antibiotics.Methods Patients with documented infection on the first day after admission into ICU and discharged from ICU from July to December 2012 and from July to December 2013 were enrolled in the study.Clinical data including presence or absence of infection,initial antimicrobial therapy,microorganism specimen sampling and culture were retrospectively analyzed.Results Of 841 patients discharged from ICU,443 had evidence of infections and received antimicrobial therapy on the admission day,and only 30 (6.8％) of them had microbiological detection results prior to treatment.There were microbial specimens available at infection sites on the admission day in 369 cases,and 360 cases (97.6％) of them were sampled in the first three days after ICU admission,while only 119 cases (33.1％) were sampled before the first dose of antimicrobial therapy.Specimens sampled were sputum (56.4％) in the majority,followed by the blood (17.4％).Further analysis of 269 infected patients receiving initial broad-spectrum antimicrobial therapy also showed that only 33.5％ cases were sampled before the first dose of broad-spectrum antimicrobial administration.The positive isolation rate of multi-drug resistant isolates including A.baumannii,S.maltophilia and B.cepacia from specimens sampled after first dose of initial broad-spectrum antimicrobial therapy were significantly higher than those sampled before antimicrobial therapy,P ＜ 0.05.There was no significant difference in isolation rate of Staph.aureus and Enterobacteriaceae between samples obtained before and after first dose of initial broad-spectrum antimicrobial therapy.Conclusions Few evidence of pathogenic microorganisms was available before initial antimicrobial therapy in ICU patients.Although sampling rate of microbial specimens is high,the most of them are sampled after the first dose of antimicrobial administration,and the patentially contaminated specimens such as sputum in predominance,obviously decrease the reliability of authentic results obtained from microorganism culture.

Objective To investigate the dynamic changes of MDA, NO, SOD and pathologic changes of the lung and kidneyduring repefusion after haemorrhagic shock in rabbits, and to study the protective effects of edaravone during thecourse.Method Totally 29 beparinized (3 mg/kg) rabbits were randomly divided into three groups:tho sham-operatedcontrol group (group C, n = 7), the haemorrhagic shock group (group I/R, n = 10), and the haemorrhagicshock group with edaravone infusion (group I/R-edaravone, n = 12). Rabbits in the latter two groups were bledfrom left arteria cmralis in 10 minutes with MAP maintained at 40 mmHg for 60 minutes, and then group I/R-edar-avone was given edaravone intravenously. After that, resuscitation began:all blood loss was replaced with normalsaline within 60 minutes with MAP at the end ≥ 70% MAP before haemorrhagic shock. Edaravone was reinjectedat 10 hours after shock.All rabbits were killed at 20 h after reperfusion.Plasma nitric oxide(NO), malonyldialde-hyde (MDA) and superoxide dismutase(SOD) in every group were measured before shock,60 minutes after shockaad 1 h, 5 h and 20 h after reperfusien. Part of the right lung and the right kidney tissues were taken from everyrabbit for pathologic examnation after sacrifice.Results There was no significant difference in MDA,NO aad SOD among three groups before shock. A higherlevel of MDA (5.35±0.29 μmol/L), NO(27.75 ±2.88 μmol/L)and lower serum concentration of SOD(194.58±14.42U/ml)could be found in group I/R during haemorrhagic shock,as compared to group C(4.44±0.59 μmol/L,25.01±4.95μmol/L,210.86±24.54U/ml,respectively,P<0.01).At 20 hours after resuscitation,MDA and NO contents continued to increase(5.69±0.24 μmol/L and 28.01±3.10 μmol/L respectively,P<0.05)while SOD contents kept decreasing(151.83±9.36 U/ml,P<0.05)in group I/R.Comparing to group I/R,group I/R-edaravone had significant lower level of MDA(3.48±0.23 μmol/L,P<0.01)and higher concentration of SOD(195.10±11.87U/ml,P<0.01).Edaravone attenuated the pathologic changes in the lung and kidney.Conclusions Edaravone could effectively protect vital organs from reperfusion injury caused by free radicals following haemorrhagic shock by reducing plasma levels of MDA,NO and increasing levels of SOD.

Objective To investigate the microbiological epidemiology and clinical use of antibiotics in patients complicated intra-abdominal infection (cIAI),therefore to optimize antibiotic use and to promote antimicrobial stewardship.Methods A total of 451 patients with cIAI from a Chinese tertiary hospital between January 2015 and December 2016 were retrospectively reviewed.The infection severity,timing of microbiological specimen sampling,culture results,initial antibiotic selection and later anti-infective regimen adjustment were analyzed.Results Three hundred and sixteen (70.1％,316/451) patients undergone microbiological investigation at infection sites within 3 days and 133 (42.1％) patients had a positive culture,of which 64.5％ were Enterobacteriaceae.Three hundred seventy-four patients (82.9％) initially received broad-spectrum antibiotics against gram-negative bacilli.Sixty-five patients (14.4％) initially received combined antibiotic therapy,of which 30.8％ were deemed as overuse.Among 308 patients who initially received broad-spectrum antibiotic therapy,268 patients (87.0％) clinically improved in five days,while de-escalation was only conducted in 72 cases (26.9％).On average,patients were treated with (2.29±1.30) antibiotics for a duration of (10.6±6.5) days,and 42.4％ received combined antibiotic therapy during hospitalization.Conclusions The major microbiological pathogens in cIAI patients in our hospital were Enterobacteriaceae.However,there are phenomena such as excessive usage with broad-spectrum antibiotics,insufficient awareness of de-escalation,and long course of anti-infective therapy,which needs to be further improved.

Objective:To evaluate the effectiveness of the information management system on the clinical application of special-grade antimicrobial.Methods:Using the established knowledge database, a computer program was designed and developed, which was embedded in the electronic medical record to intervene the clinical use of the special-grade antimicrobial since 2015. The basic information of all discharged patients from the Second Affiliated Hospital of Zhejiang University School of Medicine from January 2013 to December 2020 were extracted from the HIS system, including the medical orders for antibiotics and the drug storehouse dispensing data.The trend analysis was carried out on the changes of the use rates and antibiotic use density (AUD) of the special-grade antimicrobials in the whole hospital and intensive care units (ICU). The data were processed and analyzed using SPSS 24.0.Results:From 2013 to 2015, except for meropenem and amphotericin B, the usage rate of all special-grade antimicrobials in the whole hospital showed an upward trend ( P<0.05). The proportion of special-grade antimicrobials used in the hospital increased year by year ( χ2=7 804.081, P<0.01). The total usage rate of special-grade antimicrobials in ICU showed an upward trend year by year ( χ2=67.028, P<0.01). Since the implementation of the special-grade antimicrobial information management system in 2015, the total use rate of special-grade antimicrobials in the hospital, the use rate of various antibiotics except linezolid, amphotericin B and posaconazole, and the proportion of special-grade antimicrobials used in the hospital have all shown a downward trend year by year ( P<0.01). The total usage rate and total AUD of special-grade antimicrobials in ICU showed a decreasing trend year by year ( χ2=343.514, P<0.01, β=-0.963, P=0.002). Conclusion:The information management system for special-grade antimicrobial can effectively reduce the utilization rate and AUD of most special-grade antibiotics in hospitalized patients including ICU, and has a good clinical application value in antimicrobial stewardship.

Objective:To evaluate the effectiveness of antimicrobial stewardship based on self-developed antibiotic clinical decision support system (aCDSS) in the inpatients at a tertiary hospital for consecutive 6 years, and to provide reference for rational use and antimicrobial stewardship.Methods:aCDSS was self-designed based on information technology and applied in clinical use in our hospital from 2015. Data of inpatient information and antibacterial use from January 2015 to December 2020 were collected from HIS and aCDSS. A retrospective study was conducted in all inpatients on the utilization rate and antibiotic use density.Results:Since 2015, with the comprehensive implementation of antimicrobial stewardship based on the aCDSS,there was a significant decline on the annual rate of antibiotic usage from 44.18% in 2015 to 38.70% in 2020, as well as on the usage rate of extended-spectrum antimicrobial agents including carbapenems, broad-spectrum β-lactam/β-lactamase inhibitors, tigecycline, broad-spectrum cephalosporins, fluoroquinolones, as well as glycopeptide and antifungal drugs. Compared with 2015, the usage of carbapenems, tigecycline and broad-spectrum β-lactam/β-lactamase inhibitors was declined nearly 50% in 2020, and the density of carbapenems and tigecycline were decreased by 29.6% and 7.1%, respectively in 2020. On the other side, the utilization rate and use density of narrow-spectrum cephalosporins continued to increase by year, the use density of narrow-spectrum cephalosporins accounting for 28.2% of all antibiotics in 2020.Conclusions:With the comprehensive implementation of aCDSS, the utilization rate and density of broad-spectrum and high-priced antibacterial drugs in our hospital have decreased continuously to decline in the past 6 years, while the proportion of narrow-spectrum antimicrobials has increased year by year, indicating that the structure of antimicrobial use has been continuously optimized and that antimicrobial stewardship based on the information technology have achieved remarkable results.

OBJECTIVES: To coat a zirconia surface with silica-zirconia using a dip-coating technique and evaluate its effect on resin-zirconia shear bond strength (SBS). METHODS: A silica-zirconia suspension was prepared and used to coat a zirconia surface using a dip-coating technique. One hundred and eighty-nine zirconia disks were divided into three groups according to their different surface treatments (polishing, sandblasting, and silica-zirconia coating). Scanning electron microscopy (SEM), energy dispersive X-ray (EDX), and X-ray diffraction (XRD) were used to analyze the differently treated zirconia surfaces. Different primer treatments (Monobond N, Z-PRIME Plus, and no primer) were also applied to the zirconia surfaces. Subsequently, 180 composite resin cylinders (Filtek Z350) were cemented onto the zirconia disks with resin cement (RelyX Ultimate). The SBS was measured after water storage for 24 h or 6 months. The data were analyzed by two-way analysis of variance (ANOVA). RESULTS: SEM and EDX showed that the silica-zirconia coating produced a porous layer with additional Si, and XRD showed that only tetragonal zirconia was on the silica-zirconia-coating surface. Compared with the control group, the resin-zirconia SBSs of the sandblasting group and silica-zirconia-coating group were significantly increased ( CONCLUSIONS Dip-coating with silica-zirconia might be a feasible way to improve resin-zirconia bonding.