By inhibiting 3-hydroxy-3-methylglutaryl coenzyme A (HMG-CoA) reductase, statins up-regulate the expression and activation of endothelial nitric oxide synthase (eNOS) in brain tissues, increase the levels of serum catalase and plasma nitric oxide, enhance antioxidant capacity, decrease oxygen free radical release, improve immunoreactivities of tight junction (zonula occludens), transmembrane proteins and glial fibrillary acidic protein of astrocyte. Stains may also exert the effects that is completely unrelated with inhibiting HMG-CoA reductase, e.g. binding to leucocyte function-associated antigen-1(LFA-1) L-site, restraining its interactions between LFA-1 and intercellular adhesion molecule-1 (ICAM-1), and playing anti-inflammation and immunoloregulation roles. The above mechanisms contribute to remain the integrity of blood-brain barrier and the activity of astrocyte under the pathological conditions.

Objective To evaluate the feasibility of using corrected body weight to set the tide volume (VT) for mechanical ventilation during general anesthesia in obese patients.Methods Sixty ASA physical status Ⅰ or Ⅱ obese patients,with a body mass index of 28-44 kg/m2,scheduled for elective extremity surgery under general anesthesia,were randomly divided into 3 groups (n =20 each):VT based on actual body weight group (group A),VT based on ideal body weight group (group Ⅰ),and VT based on corrected body weight group (group C).The pulmonary function of all patients was normal.The patients were endotracheally intubated and mechanically ventilated after induction of anesthesia.According to the corresponding body weight,the initial VT was set based on 8 ml/kg in each group (RR 15 bpm,I ∶ E =1 ∶ 2,FiO2 =100％).At 10 min after start of mechanical ventilation,peak airway pressure (Ppeak),airway plateau pressure (Pplat),airwayresistance (Raw) were recorded.Arterial blood samples were collected at 30 min of mechanical ventilation for blood gas analysis and PaO2,PaCO2 and the patients requiring readjustment of VT (PaCO2 ＞ 45 mm Hg or ＜ 35 mm Hg) were also recorded.Results Compared with group A,PaCO2 was significantly increased and Ppeak,Pplat and Raw were decreased in I and C groups (P ＜ 0.01).PaCO2 was significantly lower and Ppeak,Pplat and Raw were higher in group C than in group Ⅰ(P ＜ 0.01 or 0.05).There were no patients requiring readjustment of VT in group C,however,95％ patients required readjustment of V+ in group A and 80％ in group B.The percentage of patients requiring readjustment of VT was significantly higher in A and B groups than in group C (P ＜ 0.01).Conclusion Corrected body weight based on 8 ml/kg can be used to set the Vr for mechanical ventilation during general anesthesia in obese patients with normal pulmonary function.

Objective To investigate the effect of magnesium sulfate on epidural labor analgesia with ropivacaine in the patients with preeclampsia. Methods Seventy nulliparous parturients with pre?eclampsia, aged 23-34 yr, of American Society of Anesthesiologists physical status Ⅱ or Ⅲ, weighing 63-81 kg, with a singleton fetus in vertex presentation, without contradications to neuraxial anesthesia, waiting for vaginal delivery, received epidural analgesia for labor. The patients were divided into magnesi?um sulfate group and control group using a random number table, with 35 patients in each group. In magne?sium sulfate group, magnesium sulfate 50 mg∕kg ( 30 ml) was infused intravenously over 15 min when their cervical dilation was 3 cm, while the equal volume of normal saline was given in control group. Epi?dural labor analgesia was performed with ropivacaine. The up?and?down sequential allocation was used to determine the median effective concentration of epidural ropivacaine ( EC50 ) . The severity of pain was as?sessed with visual analogue scale score. Effective analgesia was defined as visual analogue scale score of≤1. The initial concentration of ropivacaine was 0.15%. Each time the concentration was increased∕decreased according to whether or not analgesia was effective, and the ratio between the two successive concentrations was 0.9. The EC50 and 95% confidence interval ( CI) of ropivacaine for epidural labor analgesia was calcu?lated. Results The EC50 (95% CI) of ropivacaine for epidural labor analgesia was 0.066% (0.062%-0.071%) in magnesium sulfate group. The EC50 (95% CI) of ropivacaine for epidural labor analgesia was 0.078% (0.072%-0.085%) in control group. The EC50 of ropivacaine was significantly lower in magnesi?um sulfate group than in control group ( P<0.05) . Conclusion Magnesium sulfate can enhance the effica?cy of ropivacaine for epidural labor analgesia in the patients with preeclampsia.

Human errors are errors found in planning or implementation, and those found in medical practice are often major causes of mishaps.To name a few, wrong-site surgery, medication error, wrong treatment, and inadvertent equipment operation.Errors of this category can be prevented by learning from experiences and achievement worldwide.Preventive measures include those taken in human aspect and system aspect, reinforced education and training, process optimization, and hardware redesign.These measures can be aided by multiple safety steps in risky technical operations, in an effort to break the accident chain.For example, pre-operative surgical site marking, multi-department co-operated patient identification, bar-coded medication delivery, read-back during verbal communication, and observation of clinical pathway.Continuous quality improvement may be achieved when both the management and staff see medical errors in the correct sense, and frontline staff are willing to report their errors.

Objective To evaluate the effect of dexmedetomidine administered locally on the median effective concentration ( EC50 ) of ropivacaine for paravertebral nerve block ( PVNB) . Methods Forty?eight ASA physical status Ⅰ or Ⅱ female patients, aged 20-64 yr, with body mass index<24 kg∕m2 , scheduled for elective unilateral segmental mastectomy under PVNB, were randomly divided into 2 groups ( n=24 each) using a random number table: ropivacaine group ( group R) and ropivacaine mixed with dexmedetomidine group ( group RD) . PVNB was performed at T4 on the operated side guided by ultrasound and nerve stimulator. Ropivacaine 20 ml and a mixture of ropivacaine and 20 μg dexmedetomidine 20 ml were injected locally in group R and group RD, respectively. The concentration of ropivacaine was determined by up?and?down sequential allocation. The initial ropivacaine concentration was set at 0. 35%, and the ratio between the two successive concentrations was 1. 2. The EC50 and 95%confidence interval of ropivacaine were calculated using Dixon?Massey method. Results The EC50 ( 95%confidence interval) of ropivacaine was 0.27% (0.23%-0.30%) and 0.22% (0.18%-0.25%) in group R and group RD, respectively. Compared with group R, the EC50 of ropivacaine was significantly decreased by 19% in group RD. Conclusion Small dose of dexmedetomidine administered locally can significantly enhance the efficacy of PVNB with ropivacaine.

OBJECTIVE To investigate the epidemic situation of vertical dissemination of the Escherichia coli(ECO) and Klebsiella pneumoniae(KPN) isolates producing extended-spectrum beta-lactamases in the hospital.METHODS The fingerprints of the isolates were obtained by pulsed-field-gel-electrophoresis(PFGE),and were analyzed with software Quantity One.RESULTS The similarity of 10 isolates and 7 isolates among the 21 ECO(isolates) from ICU was more than 90%,and 100%,respectively;the similarity of 3 KPN isolates was 100%.The similarity of 9 isolates among the 20 ECO(isolates) was more than 90% and the similarity of 4 isolates among the 6 KPN isolates was more than 90% in the neurosurgery ward.The similar coefficients of 3 isolates and 2(isolates)(among) the 10 ECO isolates from the ward for cadre were more than 90% and 100%,(respectively.) The similar(coefficients) of 2 isolates among the 7 ECO isolates from the gastroenterology ward and 2(isolates)(among) the 18 ECO isolates from the respiratory ward were more than 90%.The isolates whose similarity was more than 90% were also found in other wards.CONCLUSIONS There are vertical disseminations of single clone of ESBL-producing organisms in several wards,especially in the ICU.It is necessary to strengthen the management of(infection)-control.

Objective To report outcomes of patients with PSA ≥ 30 μg/L with initial negative transperineal template-guided saturation biopsy (TTSB). Methods From 2003 to 2010,a total of 1824 patients underwent transperineal saturation biopsies with the prostate template at the Peking Union Medical College Hospital.44 of them had initial negative biopsy with PSA ≥ 30 μg/L were reviewed in this study.The mean age was 68 years old (range,51 to 80).The mean biopsy cores were 28.7 (range,11 to 44).The median PSA level was 40 μg/L (range,30 to 128),and the median prostate volume was 73 ml (range,30 to 190).They were divided into four groups:TURP group,chronic prostatitis group,repeat biopsy group and miscellaneous group. Results Patients were followed up for a mean of 49 months (range,12 to 91).All patients of TURP group (15 cases) were identified as prostatic hyperplasia by postoperative pathology.2 of them had a second TTSB for PSA ＞ 10 μg/L after TURP,which were negative.5 patients of chronic prostatitis group had a declining PSA level after antibiotic therapy for 3 to 4 weeks.One patient took a second biopsy,which was identified as prostatitis.All patients of repeat biopsy group (18 cases) showed no significant decrease in PSA level during follow-up and undertook biopsies 2 to 4 times,6 of which were proved to be prostate cancer.All patients of the miscellaneous group (6 cases) had a declining PSA and didn't take a second biopsy. Conclusions Close follow-up and regular PSA testing for patients who had a high PSA level with initial negative biopsy would be help to avoid both false negative of prostate cancer and unnecessary biopsy.

Objective To retrospective analyze the specimens and wards distribution and the drug resistance changes of clinical i‐solated Pseudomonas aeruginosa .Methods 1 114 strains of Pseudomonas aeruginosa were isolated from a variety of clinical speci‐mens for the identification and susceptibility testing by using Microscan Walkaway40 identification and antibiotic susceptibility anal‐ysis system and manual method from 2002 to 2012 .And the results were analyzed .Results In all of the 1 114 isolated Pseudomonas aeruginosa strains ,there were 64 .18% of them from respiratory specimens .Pseudomonas aeruginosa infection occured mainly in the ICU wards (49 .64% ) .From 2002 to 2012 ,the drug resistance rates of Pseudomonas aeruginosa to 19 kinds of antibacterial drugs increased year by year .Conclusion Pseudomonas aeruginosa often causes respiratory tract infection ,and its mechanism of drug resistance is complex .There are few alternative antimicrobial drugs for the treatment of Pseudomonas aeruginosa infection .

Objective To investigate the serum levels of uric acid (UA) in bipolar disorder patients and their clini?cal significance. Methods Serum levels of UA was measured in 126 bipolar disorder patients including 77 mania pa?tients and 49 depression patients, 69 first-episode schizophrenic patients and 126 healthy controls (control group). Bipo?lar disorder patients was assessed by using the Young Mania Rating Scale (YMRS) and the Hamilton Depression Scale (HAMD). Results The serum UA levels were significantly higher in bipolar group [(349.34 ± 107.21) μmol/L] than in schizophrenic group [(319.71±84.48)μmol/L] and in control group [(280.94±71.90)μmol/L] (P<0.01). There were signifi?cant differences in serum UA levels between manic episode and depressive episode [(366.45 ± 104.01) μmol/L vs. (322.45±107.69)μmol/L]. The serum UA levels were higher in both manic episode and depressive episode groups than in control group (P<0.01). The serum UA levels was not significantly different between patients with and without medication (P>0.05). Correlation analysis indicated that the correlation of serum UA levels with YMRS scores and HAMD scores was not significant in bipolar disorder patients (P>0.05). Conclusions Patients with bipolar disorder has elevated serum uric acid levels which may be a biomarkers of bipolar disorder.

Objective To explore the value of retrievable inferior vena cava (IVC) filter placement for prevention of perioperative pulmonary embolism (PE) in patients with lower extremity/pelvic fracture with deep vein thrombosis (DVT).Methods Clinical data of 1 891 lower extremity/pelvic fracture patients combined with DVT were retrospectively analyzed.Totally 411 patients with permanent filters were excluded,and the other patients were divided into filter group (n=843) and control group (n=637) according to whether receiving retrievable IVC filter placement or not.The incidence of perioperative symptomatic PE and mortality were compared between the two groups.Results In filter group,Optease nonpermanent filters were inserted in 218 patients,and the mean indwelling time was (14.3±3.6) days.Celcet filters were inserted in 625 patients,and the filters were successfully removed in 566 out of 578 patients who underwent filter removal surgery (97.92％,566/578),and the mean indwelling time was (15.8±4.1) days.The incidence of PE in filter group (0.12％[1/843]) was significantly lower than that in control group (1.57％ [10/637],P＜0.05).Among the patients who received chemical anticoagulant therapy,the incidence of PE in filter group and control group was 0.14 ％ (1/700) and 1.47％(9/612),respectively (P＜0.05).Conclusion Retrievable IVC filter placement is a safe and effective method for preventing perioperative symptomatic and fatal PE in lower extremity/pelvic fracture patients with DVT.