Influence of in vivo copper on MR images of the liver in rats

To investigate the effects of in vivo copper on magnetic resonance (MR) images, the authors studied Long-Evans cinnamon rats, which develop hepatitis and hepatocellular carcinoma as a result of abnormal copper metabolism. The livers of the rats were imaged before hepatitis developed; the absence of hepatic disease was confirmed histopathologically. The copper that accumulated in the liver of the rats was thought to exist in the form of divalent ions, which were suspected of reducing the T1 and T2 of neighboring protons. However, the signal intensities of the liver on T1- and T2*-weighted images did not change, suggesting that in vivo copper, even when accumulated abnormally, does not influence the signal intensity of MR images.     

Developmental pattern of the neuronal intermediate filament inaa in the zebrafish retina

α‐Internexin is a member of the neuronal intermediate filament (nIF) protein family, which also includes peripherin and neurofilament (NF) triplet proteins. Previous studies found that expression of α‐internexin precedes that of the NF triplet proteins in mammals and suggested that α‐internexin plays a key role in the neuronal cytoskeleton network during development. In this study, we aimed to analyze the expression patterns and function of internexin neuronal intermediate filament protein‐alpha a (inaa), the encoding gene of which is a homolog of the mammalian α‐internexin, during retinal development in zebrafish. Via in vitro and in vivo studies, we demonstrated that zebrafish inaa is an α‐internexin homolog that shares characteristics with nIFs. An immunohistochemical analysis of zebrafish revealed that inaa was distributed dynamically in the developing retina. It was widely localized in retinal neuroepithelial cells at 1 day postfertilization (dpf), and was mainly found in the ganglion cell layer (GCL) and inner part of the inner nuclear layer (INL) from 3–9 dpf; after 14 dpf, it was restricted to the outer nuclear layer (ONL). Moreover, we demonstrated for the first time that inaa acted distinctively from the cytoskeletal scaffold of zebrafish cone photoreceptors during development. In conclusion, we demonstrated the morphological features of a novel nIF, inaa, and illustrated its developmental expression pattern in the zebrafish retina. J. Comp. Neurol. 524:3810–3826, 2016. © 2016 Wiley Periodicals, Inc.     

Cauda equina hemangioblastoma at L5 vertebral level related to von Hippel-Lindau disease

Hemangioblastoma (HB) is uncommon, with only a few cases of hemangioblastoma with von Hippel-Lindau disease (VHL) located in cauda equina previously reported. We describe a case of hemangioblastoma misdiagnosed as nerve sheath tumour in the cauda equina.     

A screening model for low bone mass in elderly Japanese men using quantitative ultrasound measurements: Fujiwara-Kyo Study

Screening for low bone mass is important to prevent fragility fractures in men as well as women, although men show a much lower prevalence of osteoporosis than women. The purpose of this study was to establish a screening model for low bone mineral density (BMD) using a quantitative ultrasound parameter and easily obtained objective indices for elderly Japanese men. We examined 1633 men (65-84 yr old) who were subjects of the Fujiwara-Kyo Study. Speed of sound (SOS) at the calcaneus was determined, and BMD was measured by dual-energy X-ray absorptiometry at the lumbar spine (LS), total hip (TH), and femoral neck (FN). Low BMD was defined as >1 standard deviation below the young adult mean, in accordance with World Health Organization criteria. We performed receiver operating characteristic (ROC) analysis to identify a better screening model incorporating SOS and determined the optimal cutoff value using Youden index. Prevalences of low BMD at the 3 skeletal sites were 27.8% (LS), 33.5% (TH), 48.6% (FN), and 43.3% at either LS or TH. The greatest area under the ROC curve (0.806, 95% confidence interval: 0.785-0.828) and smallest Akaike's information criterion were obtained in the multivariate model incorporating SOS, age, height, and weight for predicting low BMD at all skeletal sites. This model predicted low BMD at TH with the sensitivity of 0.726 and specificity of 0.739, whereas a similar model predicted low BMD at LS with much lower validity. We conclude that the multivariate model for TH could be used to screen for low BMD in elderly Japanese men.     

EUS和ERCP、MRCP在可疑胆总管结石诊断中的临床价值

目的：评价内镜超声检查（EUS）,内窥镜逆行胆胰管造影（ERCP）和磁共振成像胆胰管造影（MRCP）在诊断可疑胆总管结石的临床价值。 方法：自2009年6月至2010年3月我院收治的胆总管结石可疑病例共93例。93例病例全部经内镜超声检查（EUS）,内窥镜逆行胆胰管造影（ERCP）和磁共振成像胆胰管造影（MRCP）方法进行诊断,前瞻性研究三项诊断方法的临床诊断价值。 结果：联合两种以上诊断方法,可大幅提高胆总管患者的诊断准确率。EUS对胆总管结石检出的灵敏性为83.8%,特异性73.7%;ERCP对胆总管结石检出的灵敏性为89.2%,特异性84.2%;MRCP对胆总管结石敏感性为93.2%,特异性100%。 结论：MRCP无论在胆总管结石可疑患者检出的特异性或灵敏性上,都显著高于另EUS和ERCP方法,显示MRCP在诊断胆总管结石可疑患者具有较大的临床优势。胆总管结石可疑患者首先可行MRCP筛查,阴性者可进一步实施ERCP或EUS检查确认。     

内镜下乳头括约肌小切开联合气囊扩张术对胆总管结石患者的疗效观察

目的 观察乳头括约肌小切开联合气囊扩张术对胆总管结石( CDS)患者的疗效.方法 将我院2010年1月至2011年9月间的161例CDS患者分为3组,54例行内镜下乳头括约肌切开术(EST组),54例行内镜下乳头气囊扩张术(EPBD组),53例行内镜下乳头括约肌小切开联合气囊扩张术(sEST+EPBD组),均根据实际情况在乳头治疗后行取石篮取石和(或)气囊取石,部分患者以碎石篮碎石后取石.结果 与EST组比较,sEST+EPBD组术后并发症的发生率显著降低,出血发生减少,较EPBD组提高了一次取石的成功率,明显降低了术后高淀粉酶血症的发生率.结论 应用乳头括约肌小切开联合气囊扩张术治疗胆总管结石,术后并发症减少,在胆总管结石取石治疗中更为有效、安全.     

Internalization of antibodies by endothelial cells via fibronectin implicating a novel mechanism in lupus nephritis

BACKGROUND: One of the crucial events in lupus nephritis is the glomerular deposition of immunoglobulins (Igs), of which pathogenic properties have been proposed mostly to be either type IIor type III allergic reactions. Some of IgG3-producing hybridoma clones established from an MRL/MpTn-gld/gld (MRL/gld) lupus mouse generate wire loop-like lesions in glomeruli resembling lupus nephritis when injected into SCID mice. These clones are useful for analyzing the mechanisms of glomerular deposition of antibodies in lupus nephritis at the monoclonal level. METHODS: Glomerular lesions of SCID mice injected with the hybridoma clones, 17H8a or 1G3 as control were analyzed by light and electron microscopy. Interaction of the antibodies with human glomerular endothelial cells (HGECs) and human umbilical vein endothelial cells (HUVECs) in vitro was studied by fluorescence microscopy, electron microscopy, and flow cytometry. RESULTS: Both antibodies did not show any antigen specificity for mouse glomeruli. The glomerular lesions generated by 17H8a, but not by 1G3, contained electron-dense deposits not only in subendothelial regions but also in the cytoplasm of endothelial cells, suggesting internalization of the 17H8a antibodies by endothelial cells. In cell culture studies, internalization of only 17H8a antibodies by HGECs and HUVECs was observed, but the antibodies did not have antigen specificity for both types of endothelial cells. The internalization by HUVECs was mediated by actin polymerization, and it was inhibited by RGDS (Arg-Gly-Asp-Ser) tetrapeptide, antihuman fibronectin and antihuman integrin beta1 monoclonal antibodies. CONCLUSION: The interaction between particular antibodies and endothelial cell surface integrins via fibronectin may be involved in their subsequent internalization by endothelial cells leading to antibody deposition in glomeruli. This may be one of the mechanisms of glomerular injury in lupus nephritis.     

Effects of barium concentration on the radiopacity and biomechanics of bone cement: experimental study

Purpose  This study was undertaken to evaluate the changes in the radiopacity and mechanics of polymethylmethacrylate (PMMA) bone cement with the addition of barium. Materials and methods  Barium sulfate powder was added to a PMMA bone cement with an initial 10% barium concentration. The changes in radiopacity and strength were evaluated by testing cement blocks containing four barium concentrations (10%, 20%, 30%, 40%). Radiopacity was evaluated by measuring the computed tomography (CT) values of the bone cement, and strength was evaluated by compressive, three-point bending, and impact load tests. Results  CT values increased in proportion to the barium concentration. The compressive load test showed that cement with a 40% barium concentration was significantly more fragile than cement with lower barium concentrations. The three-point bending load test showed that the cement became more fragile in proportion to the barium concentration. The impact load test showed that cement with 30% and 40% barium concentrations was significantly more fragile than cement with 10% and 20% barium concentrations. Conclusion  Radiopacity is increased and strength is reduced by adding increasing concentrations of barium powder to bone cement. The results of the present study suggest that adding barium permits the radiopacity and strength of bone cement to be adjusted in clinical practice.     

伤口呈色显影用于预测重症肢体缺血患者血管腔内治疗后溃疡愈合的价值初探

目的 探讨伤口呈色显影预测重症肢体缺血患者血运重建术后溃疡愈合的价值.方法 回顾性分析上海交通大学医学院附属仁济医院血管外科2011年6月1日-2014年6月30日收治成功实施Angiosome概念指导腔内血运重建的重症肢体缺血的缺血性溃疡患者临床资料.根据血管腔内血运重建术后伤口呈色显影情况分组,其中伤口呈色(+)组109例,伤口呈色(-)组64例,分别比较患者保肢率,溃疡愈合时间的差异,试分析其作为重症肢体缺血的缺血性溃疡愈合预测因子的价值.采用SPSS 19.0软件进行统计学分析.正态分布计量资料以均数±标准差(x±s)表示,两组比较采用t检验.计数资料以频数和百分比表示,两组比较采用Pearson x2检验或Fisher确切概率法.结果 纳入研究患者共173例(173条患肢),两组患者年龄、性别比例、吸烟史、冠心病、糖尿病、慢性肾功能不全、术前踝肱指数、术后踝肱指数差异均无统计学意义,溃疡愈合时间:伤口呈色(+)组(3.9±1.9)个月低于伤口呈色(-)组(7.9±2.6)个月,差异有统计学意义(P＜0.05).累积保肢率:伤口呈色(+)组(90.2％)高于伤口呈色(-)组(78.0％),差异有统计学意义(P＜0.05).通过Logistic回归分析,校正年龄、性别、吸烟史、高血压异常等因素后,伤口呈色(-)(OR=4.5,P＜0.05)、IRc(间接血供有侧支)血运重建(OR =2.6,P＜0.05)均是溃疡难愈合的独立危险因素.结论 伤口呈色显影阳性显示足部循环较好,可以作为重症肢体缺血的缺血性溃疡愈合的预测因子,而伤口呈色显影阴性是溃疡难愈合的独立危险因素.     

成年癌症患者生育力保存决策体验质性研究的Meta整合

目的 系统整合癌症患者生育力保存决策体验的质性研究,为辅助癌症患者做决策及改进现有决策支持体系提供循证依据。方法 计算机检索PubMed、EMbase、The Cochrane Library、CINAHL、Web of Science、PsycINFO、Scopus、中国知网、万方数据库、维普数据库关于癌症患者生育力保存决策的质性研究,检索时限为建库至2022年8月。采用JBI循证卫生保健中心质性研究质量评价标准对文献进行质量评价,采用Meta整合中汇集性整合方法对结果进行整合。结果 共纳入18篇文献,提炼出67个研究结果,将相似结果归纳成7个新的类别,并综合成3个整合结果：对生育力保存风险-收益的艰难权衡,紧迫决策下复杂的心理变化过程,决策过程的干扰。结论 医护人员及相关卫生机构应重视癌症患者生育力保存决策的心理体验和信息需求,优化决策程序、开发决策辅助方案,促进患者尽快完成决策。