血脂测定结果的临床可接受性分析

目的:通过对不同检测系统血脂测定结果的偏倚评估,分析各系统间结果的可比性和临床可接受性。方法:参照CLSI文件相关要求,以可溯源的检测系统为目标检测系统,测定总胆固醇(TCH)、甘油三酯(TG)、载脂蛋白A1(APOA1)、载脂蛋白B(APOB)、高密度脂蛋白胆固醇(HDL-C)和低密度脂蛋白胆固醇(LDL-C),对本院3个不同检测系统进行朗道质控物(水平2和水平3)各测定21次和测定新鲜血清标本40份。结果:朗道质控物和新鲜血清标本TCH、TG、APOA1、APOB、HDL-C、LDL-C浓度在系统间的差异均有显著性(P<0.05)。除LDL-C在各检测系统间的相关系数为0.7859~0.9259之间外,其他项目各系统间的相关系数均大于0.975。各检测系统测定TCH、TG的不精密度CV均小于5%,其他项目的不精密度CV均小于10%;以可溯源检测系统1为目标检测系统,临床可接受性能评价:TCH、LDL-C在检测系统2和检测系统3超出临床接受范围,HDL-C在检测系统2超出临床接受范围,其他项目临床均可接受。结论:3个不同检测系统测定TG、APOA1、APOB结果具有可比性;测定HDL-C结果具有部分可比性,TCH、LDL-C结果不具有可比性,需采取整改措施。     

Study on structure-property relationship of polyimide blends, 2. Structure and miscibility of polyimide PBPI-E/PTI-E blends

The structure and miscibility of polyimide PBPI-E/PTI-E blends were studied by wide- and small-angle X-ray scattering and dynamic mechanical analysis, where PBPI-E is a biphenyldianhydride-based polyimide, and PTI-E is a polyimide from 4,4′-thiodiphthalic anhydride and 4,4′-oxydianiline. The results obtained show that there exists a paracrystalline structure in the blends with high content of PBPI-E, but this does not affect the miscibility of the blends. The blends are miscible over the entire composition range, since only one T_g was observed for each blend. Meanwhile, the segregation of PTI-E during crystallization of PBPI-E in the blends is interlamellar.     

非典型肺炎病人免疫功能分析

目的 :动态监测非典型肺炎 (SARS)病人免疫功能 ,为临床诊疗提供帮助。方法 :采用回顾性及随访研究方法 ,对本院收治 10 3例SARS病人分别在入院初期、中期、高峰期、恢复期和随访时作C反应蛋白 (CRP)、免疫球蛋白、补体、纤维蛋白原 (Fib)、血沉 (ESR)、和CD4、CD8等免疫功能检查 ,并进行描述性分析及方差分析。结果 :从发病初期至恢复期CRP、Fib、ESR均有程度不同的升高 ,以CRP异常率最高。总蛋白、白蛋白、白蛋白 /球蛋白比值在疾病过程呈下降趋势。在SARS疾病过程中和随访时存在免疫球蛋白变化、补体消耗和CD4、CD8细胞减少。结论 :SARS病人免疫功能可能低于正常人。其免疫功能的检测有利于协助诊断和疗效判断     

锂与缺碘性甲状腺肿发病关系的实验研究

实验用Wistar大鼠125只。随机分成五组。动物实验期为20周。结果显示:单纯低碘或单纯高锂的大鼠均表现为增生性甲状腺肿的组织学改变及血清T_4降低、T_3升高;前者甲状腺上皮细胞增生较后者显著,后者甲状腺滤泡腔内胶质含量较多。低碘合并高锂摄入的大鼠,其甲状腺病变较单纯低碘或单纯高锂大鼠严重,并呈明显的胶性甲状腺肿组织学改变,血清T_4降低、T_3正常。可见高锂不仅有致甲肿作用,而且当它与低碘并存时,将加重甲状腺的病变,并使其向胶性甲状腺肿发展。     

共聚焦激光扫描显微镜(MRC600)活体观测川芎嗪和去甲基肾上腺素对休克状态下家兔大脑皮质内微循环的影响

目的 :共聚焦激光扫描显微镜活体观测川芎嗪和去甲基肾上腺素对休克状态下家兔大脑皮质内微循环的影响。方法 :在开放颅窗的家兔模型上 ,荧光素标记血浆 ,罗丹明 6G标记WBC ,用共聚焦激光扫描显微镜活体观测川芎嗪和去甲基肾上腺素对休克状态下家兔大脑皮质内微循环的影响 ,并经图像分析系统测量数据 ,用SAS软件包进行统计学分析。结果 :①川芎嗪抗休克效果优于去甲基肾上腺素 ;②去甲基肾上腺素在休克状态下对口径为 60 .15 μm的动脉血管处未引起明显的血管运动 ,而川芎嗪能引起血管运动 ,尤以大剂量川芎嗪引起强烈的血管运动 ;③川芎嗪和去甲基肾上腺素增加或保持血液缘流厚度不变 ,可能是两者抗休克机制发挥作用的途径之一 ;④川芎嗪和去甲基肾上腺素引起血管运动 ,尤以中小血管处明显。结论 :川芎嗪抗休克效果优于去甲基肾上腺素。川芎嗪和去甲基肾上腺素增加或保持血液缘流厚度不变 ,可能是两者抗休克机制发挥作用的途径之一     

应用多层螺旋CT对耳硬化症的术前评估价值

目的:评估MDCT在术前耳硬化症诊断中的作用。方法:收集经临床证实为耳硬化症、且CT扫描采用螺旋扫描病例共18例,采集的数据传输到4.1工作站,进行多平面重建。结果:18例共36耳显示异常:单独前庭窗异常18耳,表现为前庭窗扩大或狭小,周围骨质密度降低或镫骨底板板密度增高;前庭窗及蜗窗同时受累共8耳;主要累及耳蜗周围迷路骨质10耳,表现为耳蜗骨迷路边缘不整,呈条片状密度减低或双环征。MPR交互重建充分显示了所有重要解剖结构的位置、形态:其中3耳为颈静脉球高位。结论:MDCT可以正确显示耳硬化症病灶的细微改变,提供详细的术前诊断信息;结合MPR技术可全面观察病变范围,并充分显示颞骨内重要解剖结构的位置和形态。对于手术方案的设计、防止手术并发症和提高疗效等具有重要意义。     

心包内处理肺静脉根部或切除部分左房在晚期肺癌手术中的应用

目的:探讨切开心包处理肺静脉或切除部分左心房对提高晚期肺癌患者的外科手术切除率及提高手术疗效的作用.方法:对21例晚期肺癌患者施行肺叶或全肺切除时,在心包内处理肺静脉或切除部分左心房.其中左肺下叶切除6例、左全肺切除4例、右肺中下叶切除6例、右肺下叶切除3例、右全肺切除2例.结果:21例均手术顺利;术后并发心律失常2例,肺炎2例,均治愈.本组1年生存率61.9%(13/21)、3年生存率38.1%(8/21),其中2例生存＞5 a.结论:晚期肺癌累及肺静脉根部或左心房时,通过切开心包处理肺静脉或同时切除部分左心房可提高肿瘤的根治率.     

Biomechanical Properties of Esophagus during Systemic Treatment with Epidermal Growth Factor in Rats

The epidermal growth factor (EGF) is a growth factor with effects on many cell types and tissue. Morphometric and passive biomechanical properties were studied in isolated segments of the esophagus in 22 EGF-treated rats and 12 control rats. The rats were divided into groups with EGF treatment for 2, 4, 7, and 14 days (n=6 for each group except n=4 for the 14 days EGF-treatment group) or saline treatment (n=3 for each group). The mechanical test was performed as a distension experiment in vitro where the whole esophagus was stretched to its in situ length and distended with pressures up to 10 cm H₂O using a ramp distension protocol. The pressure and outer diameter were recorded. Circumferential stress (force per area) and strain (deformation) were computed from the diameter and pressure data using the zero-stress state as reference. The zero-stress state was obtained by cutting esophageal rings radially. This caused the rings to open up into a sector. EGF induced pronounced morphometric changes, e.g., the wall thickness, wall cross-sectional area, and inner and outer circumferential lengths significantly increased during the EGF treatment. Histological analysis showed mucosa and submucosa growth during EGF treatment. The opening angle and residual strains increased with the highest value in the 14 days EGF-treated group (P < 0.05). The change in opening angle depended largely on the change in mucosa thickness. Furthermore, the circumferential stiffness of the esophagus reached a maximum after 7 days EGF treatment (P < 0.01). © 2003 Biomedical Engineering Society. PAC2003: 8719Rr, 8717Ee     

生长抑素样免疫反应物在山羊脊髓和背根节的分布─ABC法研究

用免疫细胞化学ＡＢＣ法研究了生长抑素样免疫反应物在山羊脊髓和背根节的分布。在整个脊髓背角，出现浓密的生长抑素样纤维和终末网，在板层Ⅱ和Ⅲ形成不规则的波形带。在带的深面，大量的生长抑素阳性小细胞（直径小于１５μｍ）形成细胞带，这些细胞呈卵圆形或梭形，大多是双极细胞。在背角最表层仅有稀疏的生长抑素阳性纤维。这种分布型式显著不同于以前报道的其它动物。在胸髓中间外侧核有为数不多的生长抑素阳性细胞，在脊髓的其它部位如中间带区和腹角有少量散在纤维和终末。还发现纤细的生长抑素阳性纤维和终末网出现于骶髓中央管的背外侧区域。此外，在所有背根节只见到极少数生长抑素阳性神经元；切断背根时，相应节段的脊髓背角的生长抑素样免疫反应物无明显变化。本研究结果表明，山羊脊髓背角的生长抑素主要来源于脊髓背角的固有神经元，而不是背根节细胞。出现于脊髓板层Ⅱ和Ⅲ的生长抑素阳性神经元可能属于岛细胞。本研究还提示，生长抑素可能在脊髓的感觉和内脏运动系统中起作用，还表明生长抑素免疫反应物的分布存在着种属差异。     

Identification of MEN1 gene mutations in sporadic carcinoid tumors of the lung

Lung carcinoids occur sporadically and rarely in association with multiple endocrine neoplasia type 1 (MEN1). There are no well defined genetic abnormalities known to occur in these tumors. We studied 11 sporadic lung carcinoids for loss of heterozygosity (LOH) at the locus of the MEN1 gene on chromosome 11q13, and for mutations of the MEN1 gene using dideoxy fingerprinting. Additionally, a lung carcinoid from a MEN1 patient was studied. In four of 11 (36%) sporadic tumors, both copies of the MEN1 gene were inactivated. All four tumors showed the presence of a MEN1 gene mutation and loss of the other allele. Observed mutations included a 1 bp insertion, a 1 bp deletion, a 13 bp deletion and a single nucleotide substitution affecting a donor splice site. Each mutation predicts truncation or potentially complete loss of menin. The remaining seven tumors showed neither the presence of a MEN1 gene mutation nor 11q13 LOH. The tumor from the MEN1 patient showed LOH at chromosome 11q13 and a complex germline MEN1 gene mutation. The data implicate the MEN1 gene in the pathogenesis of sporadic lung carcinoids, representing the first defined genetic alteration in these tumors.