结直肠癌流行病学特征及其危险因素

近几十年内,随着经济的发展,生活方式的改变以及医疗科技水平的提高,尤其是我国,结直肠癌发病率和死亡率迅速的增长,使其防治工作面临着巨大的考验。结直肠癌的发生是一个多因素、多步骤的过程,是机体的内因和环境的外因相互作用的结果。因此,了解结直肠癌流行病学特征及其危险因素,对于结直肠癌的预防、筛查和治疗都是十分重要的。文中对结直肠癌流行特征及其危险因素进行综述。     

醒脑液对PAP双转基因痴呆小鼠行为学及胆碱能系统的早期干预作用说

目的:观察醒脑液早期干预对阿尔茨海默病模型APPswe/PS△E9双转基因小鼠行为学及脑中胆碱能系统相关酶的影响。方法:将75只PAP双转基因小鼠随机随机分为空白对照组(模型组)、阳性对照组、用药高剂量组、用药中剂量组和用药低剂量组,每组各15只。15只遗传背景相同的转基因阴性的小鼠作为正常动物组。所试药物稀释至相同体积灌胃给药,正常动物组及空白对照组给以等体积蒸馏水灌胃,连续灌胃4个月。采用Morris水迷宫测定小鼠空间学习记忆能力,避暗箱测定其条件学习记忆能力。使用比色法检测小鼠脑中乙酰胆碱(Ach)、乙酰胆碱转移酶(ChAT)及乙酰胆碱酯酶(AchE)的活性。结果:与正常组比较,模型组小鼠的学习记忆能力均有所下降,脑组织中Ach、ChAT、AchE的含量均下降。与模型组比较,阳性对照组、用药高剂量组及用药中剂量组小鼠血浆中Ach含量均有所提高,而AchE含量则出现下降。结论:醒脑液能改善阿尔茨海默病模型小鼠的学习记忆能力,其作用机制可能与调控胆碱能系统有关。     

基于社会接触网络的大规模人群天花传播并行仿真

天花生物恐怖是世界各国面临的重大潜在威胁.本文利用并行仿真的技术手段,研究天花在大规模城市人群中的传播规律并对环形接种和大规模疫苗接种这两种主要的天花疫苗接种策略进行有效性分析,结果表明环形接种措施能够有效控制天花疫情的扩散,在天花疫苗储备不足的情况下可以优先考虑采用该措施.     

MRI contrast agents: Basic chemistry and safety

Magnetic resonance imaging (MRI) contrast agents are pharmaceuticals used widely in MRI examinations. Gadolinium‐based MRI contrast agents (GBCAs) are by far the most commonly used. To date, nine GBCAs have been commercialized for clinical use, primarily indicated in the central nervous system, vasculature, and whole body. GBCAs primarily lower the T₁ in vivo to create higher signal in T₁‐weighted MRI scans where GBCAs are concentrated. GBCAs are unique among pharmaceuticals, being water proton relaxation catalysts whose effectiveness is characterized by a rate constant known as relaxivity. The relaxivity of each GBCAs depends on a variety of factors that are discussed in terms of both the existing agents and future molecular imaging agents under study by current researchers. Current GBCAs can be divided into four different structural types (macrocyclic, linear, ionic, and nonionic) based on the chemistry of the chelating ligands whose primary purpose is to protect the body from dissociation of the relatively toxic Gd³⁺ ion from the ligand. This article discusses how the chemical structure influences inherent and in vivo stability toward dissociation, and how it affects important formulation properties. Although GBCAs have a lower rate of serious adverse events than iodinated contrast agents, they still present some risk. J. Magn. Reson. Imaging 2012;36:1060–1071. © 2012 Wiley Periodicals, Inc.     

床旁颅脑超声对新生儿脑室参数测量的应用研究

目的探讨新生儿脑室参数测量在疾病诊断和脑发育评估中的应用价值。方法采用床旁超声诊断仪对出生后3 d内的新生儿颅脑进行常规检查,主要行冠状及矢状面扫描,对扫查参数进行统计分析。结果新生儿各项测定值在性别上的差异均不显著;新生儿侧脑室大小与头围呈正相关(r=0.310 0,P0.05),与新生儿体重及身长无相关性。结论床旁颅脑超声可作为常规检查手段,通过对新生儿脑室参数的测量来评估脑损伤类型和程度、评估脑的发育情况。     

"对位对线"补片固定法在腹腔镜造口旁疝Sugarbaker修补术中的应用

目的腹腔镜下Sugarbaker修补手术是造口旁疝的主要手术方式，补片固定是手术的关键技术环节，本研究介绍一种新式补片固定方法，并探讨其在临床上的应用效果。 方法回顾性分析2017年6月至2019年6月在中山大学附属第六医院住院的66例造口旁疝患者临床资料，患者均行腹腔镜造口旁疝修补手术（Sugarbaker术式），根据补片固定方式的不同分为试验组（41例，采用"对位对线"补片固定法）和对照组（25例，采用传统疝钉双圈补片固定方法）。比较两组患者相关指标和治疗效果。 结果两组患者性别、年龄、体质指数、病程以及造口旁疝分型比较，差异均无统计学意义。试验组补片固定时间短于对照组[（32.6±9.0）min vs（38.7±11.0）min，P<0.05]，两组在疝钉固定数量、血清肿、补片感染、术后住院时间指标方面，差异无统计学意义。试验组和对照组的平均随访时间差异无统计学意义[（37.6±14.8）个月vs（38.8±15.2）个月，P=0.687]，试验组的造口旁疝复发率低于对照组（2.4% vs 20.0%，P<0.05），而两组术后慢性疼痛发生率差异无统计学意义（24.2% vs 24.0%，P=0.971）。 结论在腹腔镜造口旁疝Sugarbaker修补术中应用"对位对线"补片固定法，可以缩短补片固定时间并减少术后复发，值得临床上推广使用。     

2例富士激光相机的故障维修

本文较为详细地描述了我院在使用激光相机过程中遇到的2例故障和维修过程.在维修过程中首先认真观察故障表现,仔细分析故障成因,前后经过几次尝试,最终顺利解决了问题.     

Correlation of macrophage migration inhibitory factor gene polymorphism with the risk of early-stage cervical cancer and lymphatic metastasis

Associations of functional single nucleotide polymorphisms in MIF-173G/C with early stage cervical cancer were investigated in a hospital-based case-control study on 250 patients with cervical cancer prior to surgery (including 49 cases with and 201 cases without lymphatic metastasis) and 147 healthy controls. The polymorphism was assessed using restriction fragment length polymorphism polymerase chain reaction, and the MIF serum concentration was examined using the enzyme-linked immunosorbent assay to analyze the correlation between the polymorphism and the MIF serum concentration. Carriers of the variant C allele in MIF-173 were at a significantly higher risk of cervical cancer compared to carriers of the wild-type allele (aOR=1.508; 95% CI, 1.128-2.016, p=0.05). The GC and CC genotypes may be the causative factors for cervical cancer (aOR=1.851; 95% CI, 1.132-3.027, p=0.013). Individuals with the GC+CC genotype and C allele at the MIF-173G/C site were at a significantly higher risk of cervical cancer and lymphatic metastasis. The risk of lymphatic metastasis in early stage cervical cancer was increased more than 1.6 times in patients with the CC and GC genotypes compared with those with the GG genotype. The genotype distribution and allele frequency of MIF-173G/C were statistically significant in the well-, moderately and poorly differentiated groups (P<0.05). Compared to the GG genotype and G allele, patients with GC and CC genotypes and C allele exhibited a lower degree of differentiation and a higher degree of malignancy. A significant difference was observed in MIF serum concentrations among the various subgroups (P<0.05). The early cervical cancer, lymphatic metastasis and poorly differentiated groups exhibited higher MIF levels in serum. Moreover, patients with the CC genotype exhibited higher MIF serum concentration, which could increase the risk of early stage cervical cancer and lymphatic metastasis. The results presented in this study provide the first evidence that the genetic polymorphism MIF-173 is associated with cervical cancer in humans. Detection of MIF serum concentration and genotyping may be used as biomarkers for early diagnosis and therapy for cervical cancer.