Evaluation of Intraductal Ultrasonography,Endoscopic Brush Cytology and K-ras,P53 Gene Mutation in the Early Diagnosis of Malignant Bile Duct Stricture

Background:In qualitative diagnosis of bile duct stenosis,single diagnostic measure is difficult to make a correct diagnosis,to combine several diagnostic techniques may be helpful to make an accurate ...     

Footprint Mismatch of Cervical Disc Prostheses with Chinese Cervical Anatomic Dimensions

Background:The footprint of most prostheses is designed according to Caucasian data.Total disc replacement (TDR) has been performed widely for cervical degenerative diseases in China.It is essential to...     

Long-term Efficacy of Subthalamic Nucleus Deep Brain Stimulation in Parkinson's Disease: A 5-year Follow-up Study in China

Background:

Subthalamic nucleus deep brain stimulation (STN DBS) is effective against advanced Parkinson''s disease (PD), allowing dramatic improvement of Parkinsonism, in addition to a significant reduction in medication. Here we aimed to investigate the long-term effect of STN DBS in Chinese PD patients, which has not been thoroughly studied in China.

Methods:

Ten PD patients were assessed before DBS and followed up 1, 3, and 5 years later using Unified Parkinson''s Disease Rating Scale Part III (UPDRS III), Parkinson''s Disease Questionnatire-39, Parkinson''s Disease Sleep Scale-Chinese Version, Mini-mental State Examination, Montreal Cognitive Assessment, Hamilton Anxiety Scale and Hamilton Depression Scale. Stimulation parameters and drug dosages were recorded at each follow-up. Data were analyzed using the ANOVA for repeated measures.

Results:

In the “off” state (off medication), DBS improved UPDRS III scores by 35.87% in 5 years, compared with preoperative baseline (P < 0.001). In the “on” state (on medication), motor scores at 5 years were similar to the results of preoperative levodopa challenge test. The quality of life is improved by 58.18% (P < 0.001) from baseline to 3 years and gradually declined afterward. Sleep, cognition, and emotion were mostly unchanged. Levodopa equivalent daily dose was reduced from 660.4 ± 210.1 mg at baseline to 310.6 ± 158.4 mg at 5 years (by 52.96%, P < 0.001). The average pulse width, frequency and amplitude at 5 years were 75.0 ± 18.21 μs, 138.5 ± 19.34 Hz, and 2.68 ± 0.43 V, respectively.

Conclusions:

STN DBS is an effective intervention for PD, although associated with a slightly diminished efficacy after 5 years. Compared with other studies, patients in our study required lower voltage and medication for satisfactory symptom control.     

Relative Bioavailability of Rifampicin in Four Chinese Fixed-dose Combinations Compared with Rifampicin in Free Combinations

Background:

Decreases in the bioavailability of rifampicin (RFP) can lead to the development of drug resistance and treatment failure. Therefore, we investigated the relative bioavailability of RFP from one four-drug fixed-dose combination (FDC; formulation A) and three two-drug FDCs (formulations B, C, and D) used in China, compared with RFP in free combinations of these drugs (reference), in healthy volunteers.

Methods:

Eighteen and twenty healthy Chinese male volunteers participated in two open-label, randomized two-period crossover (formulations A and C) or one three-period crossover (formulations B and D) study, respectively. The washout period between treatments was 7 days. Bioequivalence was assessed based on 90% confidence intervals, according to two one-sided t-tests. All analyses were done with DAS 3.1.5 (Mathematical Pharmacology Professional Committee of China, Shanghai, China).

Results:

Mean pharmacokinetic parameter values of RFP obtained for formulations A, B, C, and D products were 11.42 ± 3.41 μg/ml, 7.86 ± 5.78 μg/ml, 13.05 ± 6.80 μg/ml, and 16.18 ± 3.87 μg/ml, respectively, for peak plasma concentration (C_max), 91.43 ± 30.82 μg·h⁻¹ ·ml⁻¹, 55.49 ± 37.58 μg·h⁻¹ ·ml⁻¹, 96.50 ± 47.24 μg·h⁻¹ ·ml⁻¹, 101.47 ± 33.07 μg·h⁻¹ ·ml⁻¹, respectively, for area under the concentration-time curve (AUC_{0−24 h}).

Conclusions:

Although the concentrations of RFP for formulations A, C, and D were within the reported acceptable therapeutic range, only formulation A was bioequivalent to the reference product. The three two-drug FDCs (formulations B, C and D) displayed inferior RFP bioavailability compared with the reference (Chinese Clinical Trials registration number: ChiCTR-TTRCC-12002451).     

Depression of the Thoracolumbar Posterior Vertebral Body on the Estimation of Cement Leakage in Vertebroplasty and Kyphoplasty Operations

Background:

The cross-section of thoracolumbar vertebral body is kidney-shaped with depressed posterior boundary. The anterior wall of the vertebral canal is separated from the posterior wall of the vertebral body on the lateral X-ray image. This study was designed to determine the sagittal distance between the anterior border of the vertebral canal and the posterior border of the vertebral body (DBCV) and to analyze the potential role of DBCV in the estimation of cement leakage during percutaneous vertebroplasty (PVP) or percutaneous kyphoplasty (PKP).

Methods:

We retrospectively recruited 233 patients who had osteoporotic vertebral compression fractures and were treated with PVP or PKP. Computed tomography images of T11–L2 normal vertebrae were measured to obtain DBCV. The distance from cement to the posterior wall of the vertebral body (DCPW) of thoracolumbar vertebrae was measured from C-arm images. The selected vertebrae were divided into two groups according to DCPW, with the fracture levels, fracture grades and leakage rates of the two groups compared. A relative operating characteristic (ROC) curve was applied to determine whether the DCPW difference can be used to estimate the degree of cement leakage. The data were processed by statistical software SPSS version 21.0 using independent sample t-test and Chi-square tests.

Results:

The maximum DBCV was 6.40 mm and the average DBCV was 3.74 ± 0.95 mm. DBCV appeared to be longer in males than in females, but the difference was not statistically significant. The average DCPW of type-B leakage vertebrae (2.59 ± 1.20 mm) was shorter than that of other vertebrae (7.83 ± 2.38 mm, P < 0.001). The leakage rate of group DCPW ≤6.40 mm was lower than that of group DCPW >6.40 mm for type-C and type-S, but much higher for type-B. ROC curve revealed that DCPW only has a predictive value for type-B leakage (area under the curve: 0.98, 95% confidence interval: 0.95–0.99, P < 0.001), and when the cut-off value was 4.05 mm, the diagnostic sensitivity and the specificity were 94.87% and 93.02%, respectively.

Conclusions:

Depression of the thoracolumbar posterior vertebral body may be informative for the estimation of cement location on C-arm images. To reduce type-B leakage, DCPW should be made longer than DBCV on C-arm images for safety during PVP or PKP.     

Proteomic analysis of exosomes derived from human lymphoma cells

Background

Exosomes secreted by tumor cells contain specific antigens that may have immunotherapeutic purposes. The aim of this study was to characterize the proteomic content of lymphoma cell-derived exosomes (LCEXs).

Methods

In this study, exosomes derived from Raji cells (EXO_Raji) were purified and proteins of EXO_Raji were separated by one-dimensional sodium dodecyl sulfate polyacrylamide gel electrophoresis. Protein bands were identified by mass spectrometry. The protein components of EXO_Raji were analyzed using shotgun technology, and the function proteins of EXO_Raji were defined and described using the Gene Ontology (GO) database and Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis.

Results

A total of 197 proteins were identified in EXO_Raji; 139 proteins were also identified in Raji cells, showing an overlap of 70.56% of the total proteins in EXO_Raji. Interestingly, the remaining 58 proteins were unique to EXO_Raji. The GO database and KEGG were used to define and describe the function of proteins. The data showed that some important proteins involved in antigen procession and presentation as well as cell migration and adhesion were also identified in EXO_Raji, such as MHC-I and II, HSC70, HSP90, and ICMA-1.

Conclusions

LCEXs express a discrete set of proteins involved in antigen presentation and cell migration and adhesion, suggesting that LCEXs play an important role in the regulation of immunity and interaction between lymphoma cells and their microenvironment. LCEXs harbor most of the proteins of lymphoma cells and could be one of the sources of lymphoma-associated antigens for immunotherapeutic purposes.     

水杨梅根的化学成分

采用硅胶、ODS等柱色谱方法对水杨梅Adina rubella的干燥根的化学成分进行分离纯化,通过NMR,MS等波谱技术鉴定化合物结构,分离鉴定了12个化合物。分别为:5,7-二羟基-2-甲基色原酮-7-O-β-D-葡萄糖苷(1),东莨菪苷(2),(+)-lyoniresinol-3a-O-β-D-glucopyranoside(3),(6S,7R,8R)-7a-［(β-D-glucopyranosyl)oxy］ lyoniresinol(4),harman-3-carboxylic acid(5),lyaloside(6),3-oxoquinovid acid(7),齐墩果酸(8),3-acetyl oleanolic acid(9),quinovic acid 3-O-β-D-glucopyranosyl-28-O-β-L-rhamnopyranosyl ester(10),quinovic acid 3-O-β-D-glucopyranosiyl-28-O-β-D-glucopyranosyl ester(11),pyrocincholic acid 3-O-α-L-rhamnopyranosyl-28-［β-D-glucopyranosyl-(1→6)-O-β-D-glucopyranosyl］ ester(12)。其中化合物3,4,6,8~10均为首次从该植物中分离得到。     

可吸收缝线缝扎兔胆总管致良性狭窄模型的建立

目的 利用可吸收缝线缝扎部分胆总管建立兔损伤性胆管狭窄动物模型.方法 24只新西兰兔按完全随机方法分为3组:正常对照组、假手术对照组和手术组.手术组用6-0可吸收缝线缝扎1/2胆总管,手术当天和术后15、30 d检验血清肝功能指标,取狭窄段胆总管行HE染色、Masson三色染色检测胶原纤维和肌纤维的表达,免疫组化DAB法检测狭窄段胆管组织Ⅰ、Ⅲ型胶原的表达.结果 手术组动物直接胆红素、间接胆红素、丙氨酸氨基转移酶和天门冬氨酸氨基转移酶在30 d均高于术前(P＜0.01).术中观察胆总管损伤处明显狭窄,手术组病理切片中,胶原纤维大量增生形成瘢痕组织,Ⅰ、Ⅲ型胶原随着时间推移表达强度逐渐增强.结论 可吸收缝线缝扎法可有效建立兔胆总管良性狭窄模型.     

利比里亚埃博拉防控指挥协调体系特点分析

利比里亚在防控埃博拉病毒病(Ebola virus disease,EVD)疫情中,逐步构建形成一套相应的指挥协调体系。中国人民解放军首批援利医疗队赴利执行埃博拉病毒病患者诊疗任务以来,积极参与并融入利比里亚埃博拉防控指挥协调体系。作者作为我军首位援利埃博拉诊疗中心医院院长,亲自参与了利比里亚埃博拉防控指挥协调体系相关工作。本文分析总结认为该体系具有应急组建、结构开放、实体运作、交互作用、利方主导等特点,在埃博拉疫情防控中发挥了重要作用。针对我国未来疫情防控需求,有针对性地提出了强化联防联控机制、改进援外实施策略、提高疫情防控能力、深化军队走出战略等建议。     

PBL案例法在眼科临床见习中的应用

目的:探讨PBL与案例法相结合在眼科临床见习教学中的效果。方法:临床医学专业本科见习生84人,随机分为PBL案例法教学实验组(42人)和传统教学对照组(42人),通过问卷满意度调查、理论考试、临床考核对两组学生进行测评。结果:实验组和对照组理论考试成绩无明显差异。临床考核中实验组的成绩明显优于对照组。问卷调查显示实验组的学生对PBL案例法教学有很高的满意度。结论:PBL案例教学法能明显提高学生的综合素质教学效果,而不会影响眼科基础知识的学习。