Objective To investigate the genetic homology in clinical isolates of extensively drug-resistant Acinetobacter baumannii (XDRAB),so as to provide evidence for better controlling hospital infections.Methods The genotypes of 28 clinical XDRAB isolates were determined by Enterobacterial Repetitive Intergenic Consensus PCR (ERIC-PCR).PCR was conducted to analyze 9 types of β-lactamase genes (blaKPC,blaIMP,blaVIM,blaNDM-1,blaOXA-23,blaOXA-24,blaOXA-48, blaOXA-51 and blaOXA-58),the outer membrane porin gene (CarO)and insertion sequence (IS)ISAba1.We also carried out linkage analysis for ISAba1-OXA23 and ISAba1-OXA58.Results Most of the above 28 XDRAB strains were isolated from respiratory tract specimens from intensive care patients.The result of ERIC-PCR showed that there was high homology between all the strains,suggesting that they might derive from the same clone.The genes blaOXA-23,blaOXA-51,CarO and the IS ISAba1 except Class Bβ-lactamase genes,blaOXA-24,blaOXA-48,blaOXA-58,ISAba1-OXA23 and ISAba1-OXA58 were detected in all the clinical strains by PCR.Conclusions All the XDRAB isolates belong to the same clone and carry the same drug-resistant genes,indicating that there was clone spread among XDRAB isolates.

Objective To investigate the clinical efficacy of percutaneous vertebroplasty (PVP)for vertebral metastases.Methods 40 cases with 46 vertebral body metastases underwent PVP under the guidance of fluoroscopy or CT.The analgesic effect,vertebral body stability and complications after operation were observed.Results The successful rate of puncture was 100%.The pain relief was demonstrated in all cases(complete relief in 30 cases,partial relief in 8 cases,mld relief in 2 cases) after operation 1 to 3 days.All involved vertebral bodies had good stability.Imaging analysis demonstrated that the metastatic area was completely well-distributed filling and reinforce by polymethymethacrylate(PMMA) in 26 vertebra of 24 cases.The other 20 vertebral of 16 cases were great part filled by PMMA.There were no severe complications both during operation and post-operation.The treating effect was satisfying in the following 1 to 3 months.Conclusion PVP is one of the efficacious way to alleviate pain of vertebral metastases,and it can reinforce the stAbility of involved vertebral body.

Objective To evaluate the pharmacokinetic profiles of lopinavir(LPV) in Chinese HIV-infected patients.Methods A total of 16 patients were enrolled in the LPV pharmacokinetic study.Blood samples were collected before LPV intake and 0.5,1.0,1.5,2.0,2.5,3.0,4.0,6.0,8.0,10.0,12.0 h after administration.Serum level of LPV was determined by the developed high performance liquid chromatography (HPLC) method.The pharmacokinetic profiles were assessed by WinNonlin software.Results The non-compartment model pharmacokinetic (PK) parameters were as follows:the peak time of LPV (Tmax) (3.88 ± 0.23) h,maximum plasma concentration (Cmax) (10.36 ± 3.42) mg/L,minimum plasma concentration (Cmin) (2.18 ± 0.34) mg/L,the 24 h area under plasma-concentration-time curve (AUC0-24) (116.22 ± 15.68) mg · h · L-1,half life(T1/2) (4.5 ± 0.13) h,and clearance rate (CL/F) (3.44 ± 1.34) L/h respectively.Conclusions The pharmacokinetic profiles of LPV in Chinese HIV-1 infected patients demonstrate lower Cmin than those of reported studies,while other parameters are similar.Patients should be educated for compliance based on the narrow gap between Cmin and minimum effect concentration.

Objective To study the expression of p35 and p25 in rat after focal cerebral contusion and to provide experimental data for estimating brain injury time. Methods Fifty adult male SD rats were randomly divided into 0 h, 6 h, 12 h, 24 h, 3 d, 5 d, 7 d, 10 d after focal cerebral contusion, control and sham-operated groups (5 rats each group). The focal cerebral contusion rat model was established. The expression of p35 and p25 protein of the damage peripheral zone in brain were detected by HEstain-ing, immunohistochemistry and western blotting at different injury time. Results Alarge number of p35 protein and a small amount of p25 protein were expressed in control group and sham-operated group. After focal cerebral contusion, p35 presented unimodal change with time and p25 presented bimodal changes with time. Conclusion Expression of p35 and p25 showed different regularity with good time correlation, which could help to estimate the brain injury time.

Objective:To analyze the epidemiological characteristics of human immunodeficiency virus (HIV) and hepatitis B virus (HBV) co-infected patients in Beijing and investigate the associated factors.Methods:The clinical data of patients with HIV infection who were treated in HIV/AIDS designated hospitals (Peking Union Medical College Hospital, Beijing Ditan Hospital and Beijing Youan Hospital) were retrospectively analyzed.Results:A total of 11 572 patients were finally included in the study, among whom 532 patients (4.6%) were co-infected with HIV and HBV. Most of the co-infected patients were young male adults (28~48 years old), accounting for 85.9%. The main transmission route was homosexual behavior (74.8%). There were 87.4% co-infected patients treated with two anti-HBV drugs, including lamivudine (3TC) and tenofovir (TDF). From 2013 to 2018, the annual prevalence of HIV and HBV co-infection decreased gradually, with the rate of 6.37%, 4.55%, 3.92%, 4.68%, 4.24% and 2.74%, respectively. In our study, The main influencing factors of HIV and HBV co-infection were age older than 28 years old versus<28 years old ( OR=2.807, 95% CI 1.241-6.345) and marriage status (married versus unmarried, OR=1.259, 95% CI 1.004-1.579). Conclusions:The proportion of HBV infection in HIV-infected patients is 4.60% (532) in our cohort. From 2013 to 2018, the prevalence of HIV and HBV co-infection in Beijing shows a decreasing trend. The risk of co-infection is higher in married young adults (28~48 years old).

ObjectiveTo evaluatethe microbial spectrum and clinical characteristics of microbiological diagnosed bloodstream infections ( BSI ) with identified infective sources. Methods The hospitalized patients microbiologically diagnosed as BSI with identified infective sources were included in this study from January 2008 to December 2009.Data were collected retrospectively and analyzed by software SPSS 17.0.ResultsIn this 2-year study,301 strains of microbes were isolated from 249 patients.There were 205 ( 82.33％ ) patients with monomicrobial BSI,while the other 44 ( 17.67％ ) patients with polymicrobial BSI.The most common identified source of bloodstream infections was lower respiratory tract infection (125,41.5％ ),followed by intraabdominal infection (55,18.3％ ) and intravascular devices related infection (54,17.9％ ).The four most common isolated pathogens were Acinetobacter species (60,19.9％ ),Escherichia coli (50,16.6％ ),Pseudomonas species (35,11.6％ ) and Staphylococcus Aureus (34,11.3％ ).Eighty-eight (35.3％) patients died during hospitalization due to all causes,out of which 62(24.9％ ) patients died owing to BSI.The patients with BSI originated from lower respiratory tract had a higher crude in-hospital case-fatality ratio than those with BSI originated from other resources ( OR =2.186 ; 95％ CI 1.260-3.792; x2 =7.879,P =0.005). In the multivariate regression,age ≥ 65,invasive mechanical ventilation, reservation of central line and polymicrobial BSI during hospitalization were independent risk factors of death due to all causes. Conclusions Lower respiratory tract is the most common originated source of BSI with microbiological identified sources. Gram-negative bacillus taking advantage,the microbial spectrum of BSI with identified sources in our study is different from those reported before both in primary and secondary BSI.The patients with BSI originated from respiratory tract have a higher crude in-hospital case-fatality ratio.

Objective To evaluate the etiological and clinical characteristics of fungemia in Peking Union Medical College Hospital.Methods Microbial and clinical information of patients with fungemia consulted in Peking Union Medical College Hospital during 2008 to 2010 were retrospectively analyzed.Results A total of 70 patients were diagnosed with fungemia,and 100％ of them had underlying diseases or potential risk factors.Of them,40 (57.1％) patients were monomicrobial fungemia,and the other 30 (42.9％) patients with positive blood cultures were caused by at least two different microbes during hospitalization.Among 122 strains of microbes isolated from blood cultures,72 were fungi and 50 were bacteria.Among the isolated fungi,61 (84.7％) were Candida species,31 (50.8％) were Candida albicans and 30 (49.2％) were non-albicans.According to the colonization or infected sites other than blood of the isolated fungi,35 cases (50.0％) were primary fungemia; 18(25.7％) were colonizing at lower respiratory tract simultaneously; 10 (14.3 ％) caused central-line related fungemia; 3 (4.3％) were secondary to intraabdominal fungal infection; and another 4 (5.7％) isolates had multiple colonization sites.During hospitalization,37 cases died with a crude mortality rate of 52.9％,and 22 (32.9％) died of fungemia itself.In single factor analysis,ICU hospitalization(x2 =15.136,P ＜ 0.001),operation history within 30 days (x2 =3.540,P =0.060) and invasive mechanical ventilation (x2 =4.450,P =0.035) were related to crude mortality.Bacteremia during hospitalization (x2 =5.657,P =0.017),circulatory underlying diseases (x2 =3.399,P =0.065) and ICU treatment (x2 =4.955,P =0.026) increased attributable mortality.In the multivariate analysis,ICU history increased mortality during hospitalization,however,the operation history within 30 days was independently irrelevant to crude mortality during hospitalization.ICU history and bacteremia during hospitalization were independently correlated to attribution mortality of the patients with fungemia.Conclusions Fungemia,usually accompanied with bacteremia,occurs often in the patients with underlying diseases.Patients with fungemia have poor prognosis and more than 50％ patients die.ICU history increases the risk both to crude and attributable mortality.The patients with fungemia who had polymicrobial bloodstream infection have a higher attribution mortality.Operation history within 30 days is independently negatively correlated to attributable mortality.

Objective To report the clinical characteristics of prosthetic valve endocarditis (PVE).Methods All 25 cases of definite PVE (Duke criteria) diagnosed at our hospital between January 1992 to December 2008 were retrospectively analyzed. Among them, 7 cases were pathologically confirmed and the others were clinically confirmed with either 2 major criteria or 1 major and ≥3 minor criteria. Their clinical characteristics, underlying heart diseases, previous heart operations, presenting manifestations, causative microbes, echocardiographic findings and prognosis, were studied. Results (1) Although most cases underwent valve transplantations for underlying heart diseases of rheumatic heart diseases and congenital heart diseases, 10 patients were complicated with infectious endocarditis (IE) prior to the operations, 4 of them were PVE. (2) Eleven of them developed PVE within 2 months postoperatively. Fever (100%),major vessel embolism (48%), and anemia (36%) were the most frequently manifestations. Fourteen cases (56%) had positive culture results with 15 causative pathogens, including 5 coagulase-negative Staphylococcus (CNS, 3 were methicillin-resistant coagulase-negative Staphylococcus, MRSCoN), 4 fungi, 2Enterococcus faecalis, 2 Burkholderia cepacia, 1 Stenotrophomonasmal-tophilia, and 1 Streptococcus.(3)Prosthetic valve vegetations, periannular leakage, regurgitation, were the main echocardiographic findings.Transesophageal echocardiography (TEE) revealed 13 PVE who had no positive findings on previous transthoracic echocardiography (TTE). (4) Eighteen PVE (72%) developed peri-annular complications (12 leakage, 3 dehiscence, 2 abscesses, 1 fistula), major vessel embolism, congestive heart failure (16%) were frequently observed, 9 of the 17 patients died in hospital, in spite of intensive managements.Conclusions PVE has a high mortality and is a severe complication for patients who underwent heart surgery. Its causative pathogen spectrum is quite different from that of native valve endocarditis. TTE is not sensitive for some PVE cases.

Patients with end-stage liver disease complicated by invasive fungal infection have poor tolerance, difficulties in pharmacotherapy, and high mortality. Invasive fungal infection in patients with end-stage liver disease should be taken seriously in clinical practice. Pathogen test should be performed as early as possible, and standard antifungal treatment should be started at the right time to improve prognosis.

Objective To estimate the application value of a standard operating procedure (SOP) in the detection of syphilitic anticardiolipin reagin. Methods Clinical laboratories from 9 local hospitals in Shanghai participated the program. Quality control samples with unknown target value were qualitatively and quantitatively examined according to the uniform SOP in these laboratories with the same reagent and facility of horizontal reaction. External quality assessment (EQA) was carried out by using seven serum samples with no, or low (1∶ 128 dilution) to high (1∶1 dilution) concentrations of target before and after the implementation of SOP. The test results were statistically analyzed and the reasons for the detecting error were assessed. Results A total of 388 tests were performed in the 9 clinical laboratories. The total accuracy rate was 93.0%, including 40.2% in the detection of samples with 1 ∶ 8 dilution of target, 49.2% in the detection of samples with 1 ∶ 16 dilution of target, and 3.6% in the detection of samples with 1 ∶ 32 dilution of target. No forward bias was observed in these tests. There was a significant difference in the accuracy rate between the two times of EQA before and after the implementation of SOP (x2 = 4.17, P < 0.05). Conclusions The improved standard procedure for nontreponemal antigen test is beneficial to the decrease of testing error, and may provide a basis for the establishment of SOP and implementation of internal quality assessment.