不同脑缺血和再灌流过程中大鼠脑组织NO含量的动态变化

采用线栓法制成大鼠大脑中动脉梗塞 ( MCAO)模型 ,依 Hb O2 - NO法测定持续性脑缺血和缺血 /再灌流脑组织内 NO含量的变化 ,以探讨不同脑缺血和再灌流过程中 NO的变化规律及其意义。结果 :缺血 3小时受损脑组织 NO水平即增高 ,再灌流后 NO逐步升高 ,而持续性缺血状态下 NO则表现降低后再升高的变化。虽然两组 NO在 7天时均有明显降低 ,但仍高于缺血前水平。认为持续性脑缺血和缺血 /再灌流情况下 NO的变化规律有所不同 ,与缺血脑组织的缺氧及产生 NO所需底物供应缺乏有关 ,且可能与脑组织的损害密切相关     

Application of a 3D volume 19FMR imaging protocol for mapping oxygen tension (pO2) in perfluorocarbons at low field

A limited flip angle gradient-echo 3D volume acquisition imaging protocol for mapping partial pressure of oxygen (pO₂) in perfluorocarbon compounds (PFCs) at low field (0.14 T) is presented. The pO₂ measurement method is based on the paramagnetic effect of dissolved molecular oxygen (O₂) which reduces the PFC ¹⁹F T_1? Specific objectives related to imaging of PFCs through use of the protocol include improved image signal-to-noise characteristics and elimination of ¹⁹F chemical shift artifacts. A parametric Wiener deconvolution filtering algorithm is used for suppression of ¹⁹F chemical shift artifacts. Application of the protocol is illustrated in a series of calculated pO₂ maps of a gas equilibrated, multi-chamber phantom containing perfluorotributylamine (FC-43). The utility of the protocol is demonstrated in vivo through images of a commercially available perfluorocarbon based blood substitute emulsion containing FC-43 sequestered in the liver and spleen of a rat.     

Effect of IFN-γ/IL-10 on IL-10 Receptor Expression of Human Decidual Stromal Cells in Early Pregnancy

The immune-endocrine network exists in normal materno-fetal interface, and Th1/ Th2 cytokine network of the deciduas play an indeed a key role in regulation of balance of thisnetwork at human first-trimester. Cytokines are divided into two categories acco…     

早搏联律间期缩短对血流动力学的影响

目的研究房性、室性早搏联律间期缩短与桡动脉图的关系,探讨早搏对血流动力学的影响。方法经心电图诊断为房性早搏48例及室性早搏51例,再应用心功能仪检查,通过信号处理技术对早搏桡动脉图形进行面积积分。结果①早搏桡动脉图积分面积提前率〉40%时最小,20%-40%时居中,〈20%时最大（P〈0.05）。②提前率相同情况下,左房与右房的早搏桡动脉图积分面积比较差异无统计学意义（P〉0.05）;左室与右室的早搏桡动脉图积分面积比较差异有统计学意义（P〈0.05）。③早搏时的桡动脉图积分面积最小,早搏前第一个窦性心搏居中,早搏后第一个窦性心搏最大（P〈0.05）。结论早搏对血流动力学的影响主要与早搏的联律间期长短有关,室性早搏还与其发生部位有关,早搏的代偿间歇,不能改善对血流动力学的影响。     

Phenotypic and genetic analyses of T-cell-mediated immunoregulation in patients with Type 1 diabetes.

AIMS: To investigate the contribution of regulatory T cells and co-stimulatory molecules in CD4(+) T cells to the development of Type 1 diabetes (T1D). METHODS: Twelve patients with T1D, nine patients with systemic lupus erythematosus (SLE), and 12 age-matched healthy control subjects participated. We analysed the proportions of CD25(+)CD4(+) T cells and natural killer T cells (NKT cells), and the expression levels of Foxp3, CTLA-4, CD28, ICOS, PD-1 and BTLA in peripheral blood mononuclear cells and purified CD4(+) T cells. RESULTS: There were no significant differences in the proportions of CD25(+) CD4(+) T cells or NKT cells among the three groups. PD-1 expression levels of peripheral CD4(+) T cells from T1D patients were significantly lower than those from healthy control subjects (P = 0.00066). In contrast, PD-1 expression levels were similar in SLE patients and healthy control subjects. The expression levels of Foxp3, CTLA-4, CD28, ICOS and BTLA were similar in the three groups. CONCLUSIONS: Decreased expression of the PD-1 gene in CD4(+) T cells may contribute to the development and/or maintenance of autoimmune T1D. As the population studied was small and heterogeneous, further studies are required to confirm the findings.     

实验诊断课教学的探讨

探讨如何上好不同专业的实验诊断课。采用三个“坚持”的教学方法，按专业的特点，分别策划设计教学目标，应用生动有趣的临床病例分析，提高教学效果。通过上述的教学手段，使临床医学专业学生达到了“三会”，即会开检验单、会看检验单和会用栓验结果；临床护理专业学生会看检验单、会解释检验单、并懂“标本”相关知识；临床中医专业学生会开常用项目检验单、会解释检验单和会将检验结果结合中医理论诊治疾病。此法可以改善教材滞后，教学与临床实际脱节的现象。     

胰岛素样生长因子-Ⅰ对软骨细胞凋亡的抑制

目的:探讨胰岛素样生长因子-Ⅰ(IGF-Ⅰ)对软骨细胞增殖及白细胞介素-1(IL-1)诱导软骨细胞凋亡的影响,揭示其抗损伤作用机制,为关节软骨损伤治疗提供理论依据。方法:分离培养人胚胎关节软骨细胞,采用四氮甲基唑蓝(MTT)法测定不同含量软骨细胞增殖活性的变化,利用光镜、电镜、DNA电泳及流式细胞仪测定作为凋亡检测指标。结果:IGF-Ⅰ呈剂量依赖式促软骨细胞增殖,当IGF-Ⅰ含量达50μg/L时,促软骨细胞增殖作用达最大值。IL-1组光镜、电镜下可见典型的细胞凋亡形态学改变,琼脂糖凝胶电泳示特征性的DNA梯状条带,IGF-Ⅰ处理组未见明显凋亡征象。流式细胞仪检测发现,IGF-Ⅰ处理后软骨细胞凋亡率显著降低。结论:IGF-Ⅰ能促进软骨细胞增殖,对IL-1诱导的软骨细胞凋亡具有保护作用。     

路志正教授"知常达变"辨治妇科病经验撷萃

路志正教授从事中医临床多年,不仅对内科杂病有丰富的临床经验,对妇科疾病的诊疗,亦很有特色。笔者于2003年有幸侍诊左右,耳濡目染,略有所得,不揣浅陋,举述验案二则。健脾祛湿行水治疗闭经、不孕患者某,女,32岁,已婚,2003年10月9日初诊。主诉:月经稀少10余年,闭经2年。患者15岁     

常温与低温体外循环心脏直视手术对细胞因子及补体的影响

目的探讨常温及低温体外循环心脏直视手术对细胞因子及补体的影响。方法选择先天性和风湿性心脏病患者40例,随机分为常温组及低温组各20例,分别于术晨、体外循环结束时及术后1、4、7、14 d抽取患者静脉血标本,测定血浆TNF、IL-2、C3、C4值。结果两组术前各项检查指标无显著差异。(1)两组术后1~4 d的IL-2水平较术前显著下降,至术后7 d恢复正常。体外循环结束至术后4 d,低温组IL-2显著低于常温组。(2)体外循环结束时以及术后1、4、7 d,常温组TNF水平显著低于低温组。两组体外循环结束时及术后1、4 d均高于术前,常温组至术后7 d、低温组术后14 d恢复正常。(3)体外循环结束时及术后1、7 d,常温组C3水平高于低温组,术后4 d两组无差别;常温组及低温组于体外循环结束时、术后1、4 d均低于术前,至术后7 d常温组恢复正常,低温组至术后14 d恢复至术前水平。(4)两组体外循环结束时及术后1、4 d C4水平均低于术前。体外循环结束时、术后1 d,常温组C4水平高于低温组。结论常温体外循环心脏直视手术对细胞因子及补体的影响显著轻于低温组,因而对术后机体的恢复优于低温方法。