Objective To investigate the sensitivity and specificity of different methods for the detection of mycoplasma pneu‐moniae .Methods The serum and throat swab specimens were collected from 199 pneumonia patients .ELISA and real‐time fluores‐cence quantitative polymerase chain reaction (FQ‐PCR) assays were used to detect the serum mycoplasma pneumoniae IgM antibod‐y and DNA .Results Among 199 pneumonia patients ,61 cases were diagnosed as mycoplasma pneumoniae pneumonia according to the diagnosis standard .The sensitivity and specificity of ELISA and FQ‐PCR for detecting mycoplasma pneumoniae were 86 .9%and 96 .7% ,and 78 .3% and 97 .1% ,respectively .Conclusion The sensitivity and specificity of FQ‐PCR for detecting mycoplasma pneumoniae are higher than those of ELISA .

OBJECTIVE To investigate the risk factors for vancomycin-resistant Enterococcus(VRE) infections and their effective isolation measures.METHODS The data of 21 cases of VRE nosocomial infections were analyzed from Jul 2003 to Dec 2005 in Beijing Chaoyang Hospital;28 cases of antibiotic-sensitive Enterococcus infection were randomized as control.T test,chi-square test and Logistic regression analysis were used for statistics.Strict measures were taken to all of the VRE infected patients.RESULTS According to univariate analysis,the factors associated with the development of VRE nosocomial infection were age,in ICU,accepted invasive operation,Acute Physiology and Chronic Health Evaluation Ⅱ(APACHEⅡ),live in hospital more than 30 days,co-infection with other pathogens,and fluoroquinolone and vancomycin/norvancomycin use 15 days before isolation of VRE.Multivariate Logistic regression analysis identified two independent factors: accepted invasive operation and previous vancomycin/norvancomycin use.Spreading of VRE had not occurred.CONCLUSIONS Accepted invasive operation and previous vancomycin/norvancomycin use are independent risk factors for VRE infection.Effective measures can prevent the spread of VRE.

Objective To evaluate the biochemical function of rat nature three-dimensional acellular pancreatic bioscaffold (3D-APB) in promoting cell proliferation and differentiation in vitro.Methods The fresh pancreas from 10 rats were perfused to prepare 3D-APB.The biocompatibility of 3D-APB was eva luated.The experiment was divided into 4 groups based on 4 kinds of three-dimensional media for AR42J culture,including blank control group,ECM group,PLGA group and 3D-APB group.We compared the proliferation and differentiation of AR42J pancreatic acinar cell at 3 days,5 days,7 days and 10 days after seeding among 4 groups.Results The 3D-APB could represent a biocompatible scaffold capable of integrating within host tissue.The proliferation rate of AR42J cells by MTT in 3D-APB was higher,while the apoptosis rate by flow cytometry was lower than those in other 3 media,which were all significantly different (P ＜ 0.05),respectively.The protein expression of PDX-1 and PTF-1 by western blot in 3D-APB group was greatly higher than those in other 3 groups (both P ＜ 0.05).The mRNA expression of PDX-1 and PTF-1 through qRT-PCR was significantly higher than those in other 3 groups (both P ＜ 0.05).Conclusion Compared with the commonly used chemical and natural scaffold at present,3D-APB could promote cell proliferation and differentiation,which was more appropriate for regenerative medicine.

Objective To investigate the effects of endogenous sulfur dioxide (SO2) on the oxidative stress induced by cobalt chloride (CoCl2) in the rat pulmonary artery smooth muscle cells (PASMCs).Methods Rat PASMCs were treated with 200 μ mol/L CoCl2 to mimic the hypoxia insult.Endogenous SO2 generating enzyme aspartate aminotransferase 1 (AAT1) expression was upregulated or downregulated (AAT1 sh) by transfection with lentivirus.Rat PASMCs were randomly divided into 8 groups:vehicle group,vehicle + CoCl2 group,AAT1 group,AAT1 + CoCl2 group,scramble group,scramble + SO2 group,AAT1 sh group and AAT1 sh + SO2 group.SO2 donor Na2 SO3/NaHSO3 at concentration of 100 μ mol/L were added in scramble + SO2 group and AAT1sh + SO2 group.The expressions of AAT1,superoxide dismutase 1 (SOD1) and SOD2 in PASMCs were detected by Western blot method.In situ SO2 content in PASMCs was detected by fluorescent probe.The superoxide anions in PASMCs were labeled by dihydroethidium (DHE) probe under fluorescent microscope.Results Compared with the vehicle group,the levels of SO2 and the expressions of AAT1 (0.221 ± 0.002 vs.0.446 ± 0.004),SOD1 (0.076 ± 0.028 vs.0.171 ± 0.019) and SOD2 (0.080 ± 0.031 vs.0.196 ± 0.018) significantly decreased (all P ＜ 0.01),and superoxide anion increased in rat PASMCs of vehicle + CoCl2 group.Meanwhile,compared with vehicle + CoCl2 group,the levels of SO2 and the expressions of AAT1 (0.839 ± 0.056 vs.0.221 ± 0.002),SOD1 (0.177 ± 0.020 vs.0.076 ± 0.028) and SOD2 (0.195 ±0.018 vs.0.080-± 0.031) markedly increased (all P ＜ 0.01),and superoxide anion decreased in rat PASMCs of AAT1 + CoCl2 group.On the contrary,compared with the scramble group,the levels of SO2 and the expressions of AAT1 (0.062 ±0.017 vs.0.354 ±0.034),SOD1 (0.054 ±0.029 vs.0.157 ±0.023) and SOD2(0.180 ±0.100 vs.0.586 ± 0.176)significantly decreased (all P ＜ 0.01),and superoxide anion increased in rat PASMCs of AAT1sh group.Furthermore,compared with the AAT1 sh group,the levels of SO2 and the expressions of SOD1 (0.155 ± 0.022vs.0.054 ± 0.029) and SOD2 (0.578 ± 0.200 vs.0.180 ± 0.100) significantly increased (all P ＜ 0.01),and superoxide anion decreased in rats PASMCs of AAT1sh + SO2 group.Conclusion Endogenous SO2/AAT1 inhibits CoCl2-induced oxidative stress in rat PASMCs.

0. 05). Conclusion On the CTA exams with 64-slice spiral CT, good CTA image quality can be acquired with reduced contrast dose and saline flush, thereby we can afford reliable diagnostic information for the clinicians.

We are reporting in this article some analyzed data obtained from inspection and related information on current situations medical devices in use. Some ideas and suggestions are also proposed here on how to systematically and legally inspecting and monitoring medical devices in use.
Equipment Safety ; Materials Management, Hospital

Objective To evaluate the diagnostic value of 64 multidetector-row CT angiography for internal carotid artery(ICA)stenosis and the application in the follow-up of carotid endarterectomy and percutaneous transluminal stenting.Methods Forty transient ischemie attack(TIA)patients with interpretable CTA and DSA of the cervical carotid arteries were selected from May 2005 to December 2005. This yielded a total of 80 vessels.The CTA curved planar reformations(CPR)and DSA images referenced to the distal cervical internal carotid were graded by two senior neuroradiologists blindly,according to the North American Symptomatic Carotid Endarterectomy Trial(NASCET)guidelines.The paired-t test was used to verify the statistical significant difference between pre-operating and post-operating of carotid endarterectomy or percutaneous transluminal stenting in measuring the vascular diameter and area of cross section using CTA.Results When the 70% stenosis was used as the cut-off value,the seasitivity,specificity,negative predictive value,and the positive predicting value were 97%,95%,95%,and 98%,respectively.There was statistically significant difference in measuring the vascular diameter(P

To obtain a number of extracellular penicillinase,the gene(penp)encoding penicillinse of Bacillus cereus ATCC10987 was cloned into expression vector in Bacillus subtilis,transformed into Bacillus subtilis DB104 deficient in two proteases.When recombinant bacteria was cultured in LB medium for 24 hours,the result of SDS-PAGE showed that the molecular weight of the protein was 28kDa and the penicillinase activity reached 339U/ml.By screening seven different fermentation media,the result showed that 4# medium is favorable to producing penicillinase by the recombinant cells than the others,with the yield of the enzyme being 1580U/ml.When the recombinant cells was cultured in 7 liter fermentor for 24h,the penicillinase activity reached 1255.8U/ml.

To obtain a number of penicillinases and degrade penicillin in milk by using the penicillinases,the gene encoding penicillinase was amplified by PCR from Bacillus cereus ATCC10987,cloned into pET28a(+) ,transformed into E. coli BL21;analysis of SDS-PAGE and penicillinase activity of the recombinant protein were done under induction of IPTG and the result showed that the maximum penicillinase activity reached 480 U/mL;the purity of penicillinase purified by Ni2+ Purification System was more than 90%;the immobilized penicillinases were obtained by sodium periodate method and the residual quantity of penicillin in milk(containing 0.5 U penicillin G/mL) was less than 4 ppb after degraded by the immobilized penicillinase.

Objective To evaluate interventional therapy in the treatment of interposition graft stenosis or occlusion after mesocaval shunts.Methods The clinical data of 19 cases of artificial vessel stenosis or occlusion after mesocaval shunts for portal hypertension at our department from march 2009 to march 2012 were retrospectively analyzed.Results In the 19 cases with artificial vessels stenosis or occlusion developed after mesocaval interposition shunts for portal hypertension,there were 5 cases in which acute thrombosis occurred within a week after the surgery.Catheter directed thrombolysis was successfully conducted.In 6 cases in which shunt stenosis developing 1 to 8 years after surgery were managed by balloon dilatation or stent angioplasty successfully.The shunt graft occlusion occurred in 8 cases after 1 to 4 years of surgery was successfully managed and the shunt was reopened by balloon dilatation or stent angioplasty in 6 cases,and in 2 the procedure was failed for the guide wire can't go through the anastomotic site of artificial vessel-superior mesenteric vein.In 11 cases embolization of the esophagogastric varices was successfully carried out for postoperative standard anticoagulation.During a period of 3 months to 3 years follow-up,stenosis recurred 1 year after balloon dilatation in one case,and stenosis was managed by angioplasty successfully.Conclusions Interventional radiological techniques by percutaneous puncture through femoral vein-inferior vena cava-artificial vessel-portal vein (including catheter directed thrombolysis,balloon dilatation,stent placement,etc) are less traumatic,highly successful in the treatment of shunt stenosis or occlusion after mesocaval shunts in portal hypertension.