Objective To develop a rapid and sensitive method for the determination of bisphenol A in drinking water by liquid chromatography-electrospray tandem mass spectrometry. Methods Bisphenol A was extracted from the drinking water sample by a SEP-PAK C18 column,eluted with methanol and concentrated with a rotary evaporator. The extract was analyzed by liquid chromatography-tandem mass spectrometry with electrospray ionization. Results The calibration curve of bisphenol A was linear in the range of 5 -100 ng/ml,the linear equation was y =6 796.61x -8 655.64 and the correlation coefficients of linear calibration curve was 0.999 2. The limit of detection (S/N=3) and the limit of quantification (S/N=10) of bisphenol A were 0.007 5 ng/ml and 0.025 ng/ml,respectively. The rates of recovery of bisphenol A were from 83.46% to 94.00% and the relative standard deviation was 3.06% -4.60%. Conclusion The method is simple,rapid,accurate and is applicable to the qualitative and quantitative determination of bisphenol A in drinking water.

Objective To investigate the relationship between end-tidal carbon dioxide with its related indicators and ventilation/perfusion of the acute respiratory distress syndrome (ARDS) lung,and to explore a feasible way to titrate positive end-expiratory pressure (PEEP) in clinical practice.Methods Five mixed-breed dogs with oleic acid lung injury model were mechanically ventilated at a serial PEEP trial including a recruitment maneuver (RM) before each PEEP level changed.The value of blood dynamics,end-tidal carbon dioxide partial pressure ( PetCO2 ) and arterial carbon dioxide pressure under different PEEP levels were recorded.Arterial end-tidal carbon dioxide gradient (Pa-etCO2) and dead space fraction (Vd/Vt％) were calculated.All dogs received CT scan.Lung volume under different pressure levels,and ratio and volume of alveolar closing pressure,collapsed alveoli,sufficiently and insufficiently ventilated alveoli were obtained.Alveolar opening and closing analysis were performed by non-liner regression equation.Results The mean pressure when Vd/Vt％ obtained lowest level were ( 11.2 ± 4.4 ) cm H2O(1 em H2 O =0.098 kPa),which had no significant difference when compared to alveolar closing pressure[ ( 11.5 ± 3.2 ) cm H2O ]( P ＞ 0.05 ).The fraction of insufficiently ventilated and collapsed alveoli showed a significant linear correlation with the Vd/Vt％ when PEEP was lower than Pmin ( r =0.632,P =0.004 ).There was a linear correlation between the Vd/Vt％ and the fraction of over-distended alveoli when PEEP was higher than Pmin ( r =0.770,P =0.001 ).Conclusions Closing pressure is in accordance with PEEP level after RM having reached the best ventilation/circulation ratio.The characteristics of lung collapse can be revealed by Vd/Vt％ changes after RM.To titrate PEEP for the lowest Vd/Vt％ after RM may be a feasible way to match the best ventilation and circulation effects of PEEP.

Objective To evaluate the clinical efficiency of posterior unilateral open-door laminoplasty and leverage titanium plate internal fixation in the treatment of cervical spondylotic myelopathy ( CSM ) with multi-segmental spinal stenosis.Methods Between Mar 2011 and May 2015, 25 patients with multi-segmental CSM with multi-segmental spinal stenosis were treated by posterior unilateral open-door laminoplasty and leverage fixation .There were 16 males and 9 females, whose mean age was 60.6 ±9.9 years during the surgery.The change of clinical symptoms and signs was recorded during follow-up,and they all received X-ray and MRI.In all the patients, the preoperative and postoperative neurological function, the cervical curvature,cervical vertebra tube volume and axial symptoms were measured , recorded and analyzed. There was statistically significant difference (P<0.05) in the mean Japanese Orthopaedic Association (JOA) score, and Visual Analogue Scale ( VAS) .Results All the 25 patients were followed up for more than 6 months ( 6-24 months ) .No symptoms of C5 nerve root were found in our series .According to the JOA score and VSA score ,the neurological functions of each patient were significantly improved .The preoperative JOA score was 10.16 ±1.35 and the improvement rate 61.24%. There was statistically significant difference between the preoperative VSA score and the postoperative one (6.68 ±1.12 vs 2.32 ±0.84) ( P<0.05).The preoperative and postoperative meansurement of the spinal vertebrai canal diameter was (9.22 ±2.01) and (15.64 ±2.08) mm, respectively,so there was statistically significant difference (P <0.05), indicating that the cavical spinal canal was increased after operation .Conclusion Leverage titanium plate internal fixation can effectively help maintain the expanded vertebral canal after unilateral open -door laminoplasty ,reduce the incidence of postoperative axial symptoms , and maintain the cervical physical curvature .

Objective To analyze the distribution and clinical characteristics of gastrointestinal virus infection in infants with acute diarrhea.Methods Stool samples and clinical data were collected from 900 infants (≤5 years old) with acute diarrhea in outpatient department of Beilun District People' s Hospital during July 2012 and July 2013.Specimens were tested for 5 gastrointestinal virus including group A/B/C rotavirus (RV),adenovirus (AdV),astrovirus (AstV),sapovirus (SV) and norovirus (NV) by the multiplex PCR assay.Chi-square test was performed to compare the positive rates of virus infection among children with different genders and ages.Results Among 900 stool samples,369 were positive of gastrointestinal virus,of which 291 were positive for single virus and 78 for mixed virus.In single virus infection,NV was detected with the highest positive rate of 19.4％ (4.9％ for G Ⅰ and 14.6％ for G Ⅱ),followed by RV-A (8.2％),SV (2.9％),AstV (1.0％) and AdV (0.8％).RV-B and C type were not found.In 78 cases with mixed infections,RV-A plus NV infection was the most common one with a prevalent rate of 5.8％.The positive rate in age group ≤2 years old was 51.0％,which was significantly higher than that of age group ＞ 2-5 years old (22.1％,x2 =70.404,P ＜ 0.01).In 369 children with positive gastrointestinal virus,fever was present in 24.1％,and vomit in 35.2％ of children.Fever,vomit and fever plus vomit was more common symptoms in children with mixed infections (x2 =17.878,21.869 and 14.155,P ＜ 0.01).Conclusion NV and RV-A are the most common pathogens in infants with acute diarrhea in Beilun district,especially in children younger than 2 years old.

AIM: To investigate the effects of transient receptor potential channel 6 (TRPC6) on the proliferation of rheumatoid arthritis fibroblast-like synoviocytes (RA-FLS) induced by IL-1β.METHODS: The mRNA expression of TRPC6 in synovial tissues from RA or OA patients was studied by RT-qPCR.RA-FLS were cultured by enzyme digestion and tissue adhesion methods.The method of flow cytometry was applied to identify the RA-FLS.RA-FLS were treated with different concentrations (0, 0.25, 0.5, 1, 2, 4, 8 and 16 μg/L) of IL-1β for 36 h.The cell viability was examined by CCK-8 assay.RA-FLS were incubated with IL-1β (16 μg/L) for different time (12, 24, 36, 48, 60 and 72 h), and the cell viability was measured by CCK-8 assay.The interference efficiency of TRPC6-siRNA was determined by RT-qPCR and Western blotting.After incubation in the presence or absence of IL-1β medium, the cell viability, the percentage of EdU-positive cells and the percentage of (G2/M+S) phase were measured by CCK-8 assay, EdU labeling assay and flow cytometry, respectively.RESULTS: The mRNA expression of TRPC6 was found in synovial tissue with higher levels in RA patients than that in OA patients.TRPC6-siRNA significantly decreased the mRNA and protein expression of TRPC6 (P<0.05).When RA-FLS were treated with IL-1β, the proliferation of RA-FLS was increased (P<0.05).The differences of the cell viability, the percentage of EdU-positive cells and the (G2/M+S) phase percentage between TRPC6-siRNA group and blank control group or NC-siRNA group were significant, in the presence of IL-1β (P<0.05).However, they were not significant in the absence of IL-1β.CONCLUSION: TRPC6 is involved in the proliferation of RA-FLS induced by IL-1β.Silencing of TRPC6 gene inhibits the growth of RA-FLS induced by IL-1β.

PurposeTo investigate the role of diffusion weighted imaging (DWI) in the detection of focal liver lesions (FLL).Materials and Methods T2WI, dynamic contrast enhancement (DCE) and DWI (b=100 s/mm2 and 600 s/mm2 respectively) were performed in 205 patients with 310 FLLs. All images were read by two reviewers to determine the detection of FLLs and score the confidence. The consistency of the results given by the two reviewers was evaluated. The confidence scores between different sequences and the detection rate of different sequences were also compared.Results The consistency of the two reviewers was excellent or good in T2WI, high b value DWI, low b value DWI, and DCE (Kappa=0.71, 0.85, 0.82 and 0.64,P<0.05). As to the confidence score of lesion detection, high b value DWI and low b value DWI were both significantly higher than T2WI (P<0.01), but both were lower than DCE (P<0.01). DWI yielded higher score and detection rate for detecting FLLs than T2WI (86.5%vs. 70.3%,P<0.01), but lower than DCE (91.6%,P<0.05). For small malignant lesions (≤2 cm in diameter), DWI showed similar detection rate with DCE (P>0.05), but higher than T2WI (P<0.01). The combination of DWI and DCE detected more small malignant lesions than DWI or DCE alone (P<0.01).Conclusion DWI can detect more FLLs than T2WI, and can help DCE detect small malignant FLLs. Therefore DWI is suggested to be included in the routine protocol of liver MRI examination.

Objective To evaluate fluid responsiveness by stroke volume variation (SVV) in mechanically ventilated patients with refractory septic shock.Methods Forty-two refractory septic shock patients were enrolled in the study.According to the responsiveness of fluid loading, the patients were divided into responsive group and non-responsive group.The SVV values of two groups were retrospectively analyzed.The receiver operating characteristic curve was drafted to determine the cut-off value of SVV for predicting fluid responsiveness.Results Among the 42 refractory septic shock patients, 24 were found responsive to fluid loading, 18 were not;before the fluid loading, central venous pressure, heart rate, mean arterial pressure and global end-diastolic volume index in the both groups showed no significant differences whereas the SVV in the responsive group was much higher than that in the nonresponsive group (P =0.006).Using SVV ≥ 12% as the threshold to predict fluid responsiveness, the sensitivity was 77%,specificity was 85%.Conclusion SVV can accurately predict fluid responsiveness in refractory septic shock patients.

Objective To evaluate the usefulness of serum galactemannan(GM) for the diagnosis of invasive pulmonary aspergillosis (IPA) in critically ill patients. Methods Study was conducted between February 2007 and July 2008. Included patients on admission ICU who suffer from suspected IPA. GM test and culture were collected 2 weekly. Chnical feature, mycological evidence and optical density index (ODI) were noted. Clinically invasive fungal infection(IFI) were defined proven, probable and possible. The patients were classified into neutropenia, non-neutropenia and treated with immunosuppressive agents, non-neutropenia and non-immunosuppressive agents. To compared of the sensitivity and specificity of GM in different patients. Results 94 patients were included, 4 patients were proven, 29 patients were probable, 34 patients were possible IFI, 27 patients were non-IPA. The positive rate of the GM was 31.9% (30/94). The sensitivity and specificity of GM in proven cases and probable cases are 66.7% and 92.6%. GM assay tended to become positive earlier than the culture 2-10(5.33±2.17)d. We found that differences in patient diagnosis and selection might account for the disparities seen for positive rate for the GM test. There was positive in three of the four patients with proven, the positive rate of GM was 65.5% for probable cases, for possible cases was 17.6%, for non-IPA cases was 7.4% (P=0.001). For patient with neutropenia , treated with immunosuppressive agents and without immunosuppressive agents, the positive rate of GM was 52.9%vs 41.7% vs 34. 6% (P=0.015) ;the sensitivity was 80.0% vs 70. 0% vs 53.8% (P=0.011), the ODI was 1.365 (0.582-6.736) vs 1. 123 (0. 623-6.868) vs 0.554 (0.522-0.823), P=0. 005, respectively. Conclusion These results show that GM test is useful for early diagnosis IPA in critically ill patients. Differences in patient selection and diagnosis might account for the disparities seen for positive rate and sensitivity for the GM test. It has been higher sensitivity and ODI in the patient treated by immunosuppressive agents.

Objective To evaluate the image quality and radiation dose of prospective electrocardiography-triggered coronary 320-slice volume CT angiography with different kV, and the feasibility of coronary scan with ＜ 1 mSv radiation dose.Methods Eighty consecutive patients were randomly divided into two groups equally.The tube voltage according to paradigm was 100 kV in group A and 120 kV in group B.All raw data in group A was reconstructed by the software AIDR in CT system to create a new group named as A1. Such parameters as the mean intraluminal attenuation (SI),noise (SD),signal-to-noise ratio (SNR),contrast-to-noise ratio (CNR),effective radiation dose(E) and image quality score measured in group A were compared with those in group B.The values such as SI,SD,SNR,CNR,image quality scores were compared between group A and group A1.The significance of group B and group A1 was compared in SI,SD,SNR,CNR,image quality scores as well.Results E in group A was significantly lower than that in group B[ E =(0.67 ± 0.18) mSv in group A vs.E =(3.08 ± 1.04) mSv in group B].The value of E in group A was decreased by 78％ compared to group B(t =- 14.30,P＜0.05 ).There was no significant difference in mean image quality scores between two groups(4.57 ± 0.57in groupA vs.4.59 ± 0.59 in group B,t=-1.17,P＞0.05).The values of SI,SD,SNR,CNR in group A were (570.8 ±131.5)HU,25.1 ±6.9,24.5 ±9.1,19.8 ±6.1.And the values of SI,SD,SNR,CNR in group B were (460.6 ± 14.3) HU,15.1 ±3.6,31.7 ±7.7,29.3 ±6.8.The values of SI and SD in group A were significantly higher than those in group B(t =4.49,8.18,P ＜0.05). The values of SNR and CNR in group A were lower than those in group B (t =-4.24,-6.19,P＜0.05).The valuesofS1,SD,SNR,CNR,image quality scores in group Al were (557.9 ±24.5) HU,21.1 ±6.0,27.7±10.0,23.4±7.8,4.60 ± 0.56.There was no difference in the SI and the image quality scores between group A and group A1 ( t =1.09,- 1.90,P ＞ 0.05).Conclusions 320-slice volume CT with 100 kV tube voltage and prospective ECG-triggered technique can reduce the radiation dose to less than 1 mSv and obtain optimal images in diagnosis of coronary arterial diseases.

Objective To investigate the effect of the bedside lung ultrasound in emergency (BLUE)-plus lung ultrasound protocol on lung consolidation and atelectasis of critical patients.Methods All patients who need to receive mechanical ventilation for more than 48 hours in ICU from June 2010 to December 2011 in Peking Union Medical College Hospital were included in the study.BLUE-plus and BLUE lung ultrasound,bedside X-ray,lung CT examination were performed on all patients at the same time.The condition of lung consolidation and atelectasis discovered by BLUE-plus lung ultrasound protocol was recorded and compared with bedside X-ray or lung CT.The difference in assessment of lung consolidation and atelectasis between BLUE-plus lung ultrasound protocol and BLUE protocol was compared.Results A total of 78 patients were finally enrolled in the study.The lung CT found 70 cases (89.74％) had different degrees of lung consolidation and atelectasis.The sensitivity,specificity and diagnostic accuracy of lung consolidation and atelectasis by the bedside chest X-ray were 31.29％,75.00％ and 38.46％,respectively.BLUE-plus lung ultrasound protocol found 68 cases with lung consolidation and atelectasis,and its sensitivity,specificity,and diagnostic accuracy were 95.71％,87.50％ and 94.87％,respectively,which were significantly higher than those of lung CT.BLUE protocol found 48 cases of lung consolidation and atelectasis,and its sensitivity,specificity,and diagnostic accuracy were 65.71％,75.00％ and 66.67％,respectively.The position of lung consolidation and atelectasis which hadn't been found by BLUE protocol was mainly proved to be located in the basement of lung by lung CT.Conclusions The incidence of lung consolidation and atelectasis in critical patients who received mechanical ventilation is high.The BLUE-plus lung ultrasound protocol has a relatively higher sensitivity,specificity and diagnostic accuracy for consolidation and atelectasis,which can find majority of consolidation and atelectasis.As BLUE-plus lung ultrasound is a bedside noninvasive method allowing immediate assessment of most lung consolidation and atelectasis,it will be likely the alternative of the CT and play a key role in assessment of lung consolidation and atelectasis.