萘普生对大鼠着床期宫内PGF_(2α)含量及宫内节育器抗生育作用的影响

本文测定了对照组及两个萘普生(前列腺素合成酶抑制剂)处理组大鼠着床期宫内PGF2α的含量。结果表明,对照组、萘普生低剂量组(2mg/kg体重)和高剂量组(20mg/kg体重)的PGF2α含量分别为6.71±0.93、2.19±0.34和1.01±0.18ng/100g组织(三组间P<0.01)。同时,还观察到在本实验条件下,萘普生无明显干扰节育器抗生育作用,药物本身亦未呈现显著抗生育活性。     

Multicenter Randomized Comparison of Xenon and Isoflurane on Left Ventricular Function in Patients Undergoing Elective Surgery

Background: Volatile anesthetics are commonly used for general anesthesia. However, these can induce profound cardiovascular alterations. Xenon is a noble gas with potent anesthetic and analgesic properties. However, it is uncertain whether xenon alters myocardial function. The aim of this study was therefore to investigate left ventricular function during anesthesia with xenon compared with isoflurane.

Methods: The authors performed a randomized multicenter trial to compare xenon with isoflurane with respect to cardiovascular stability and adverse effects in patients without cardiac diseases scheduled for elective surgery. Two hundred fifty-nine patients were enrolled in this trial, of which 252 completed the study according to the protocol. Patients were anesthetized with xenon or isoflurane, respectively. Before administration of the study drugs and at four time points, the effects of both anesthetics on left ventricular function were investigated using transesophageal echocardiography.

Results: Global hemodynamic parameters were significantly altered using isoflurane (P < 0.05 vs. baseline), whereas xenon only decreased heart rate (P < 0.05 vs. baseline). In contrast to xenon, left ventricular end-systolic wall stress decreased significantly in the isoflurane group (P < 0.05 vs. baseline). Velocity of circumferential fiber shortening was decreased significantly in the xenon group but showed a more pronounced reduction during isoflurane administration (P < 0.05 vs. baseline). The contractile index (difference between expected and actually measured velocity of circumferential fiber shortening) as an independent parameter for left ventricular function was significantly decreased after isoflurane (P < 0.0001) but unchanged using xenon.     

1992～2001年海南省结核病防治工作情况分析

目的　分析海南省结核病防治工作现状和经验。方法 根据全省各市(县)上报的结核病报表和有关总结材料,分析结核病现状、防治对策及效果。结果 海南省应用现代结核病控制策略以来,1992～2000年共检查可疑肺结核病患者192077例,查痰48670例,查痰率25.3%。发现并登记活动性肺结核病人31822例,其中涂阳病人22946例,涂阳新登记率从1992年12.8/10万上升到2000年48.4/10万。至2001年12月止,共治愈了21625例涂阳病人,总治愈率达94.2%。结论 海南省结核病疫情严重,近10年来经过应用现代结核病控制策略,取得显著成效,证明该策略是控制结核病流行最有效的技术措施。     

失血性休克大鼠肠上皮细胞线粒体DNA腺苷三磷酸酶6,8基因表达及线粒体功能的改变

目的　探讨失血性休克大鼠肠上皮细胞线粒体DNAATPase 6 ,8基因表达及线粒体功能的改变 ,为阐述休克肠道靶学说和线粒体能量代谢提供分子生物学基础。　方法　 2 4只Wistar大鼠随机分为休克前组和休克 1,2 ,3,4 ,5h组。采用RT -PCR方法观察线粒体ATPase 6 ,8mRNA量的改变。用透射电镜观察、生物体视学测量线粒体形态 ,用Clark氧电极测线粒体呼吸功能。　结果　失血性休克 1,2h ,ATPase 6 ,8基因表达增强 ,以后渐减弱 ,至休克 5h表达最低 ,ATPase 6 ,8基因表达分别降为正常的 6 9.3%和 78.4 % (P <0 .0 1和P <0 .0 5 )。失血性休克 2h和5h ,线粒体平均截面积、长径、面密度、体密度均显著增加 (P <0 .0 1) ,休克 5h时分别为休克前的2 .0 ,1.4 5 ,1.4 7,2 .2 2倍。休克 5h ,线粒体比表面和数密度分别下降 32 %和 2 4 % (P <0 .0 1和P <0 .0 5 ) ,嵴和基质破坏明显。失血性休克后肠上皮细胞线粒体呼吸控制率和氧化磷酸化效率比休克前显著降低 (P <0 .0 1)。　结论　失血性休克时大鼠肠上皮细胞线粒体DNAATPase 6 ,8基因表达下调 ,线粒体呼吸功能出现障碍 ,线粒体超微结构发生了改变     

A case study identifying nursing staffs'' perception of the delivery method of nursing care in practice on a particular ward

The research describes how nursing staff on a general surgical ward in a district general hospital perceived the delivery method of nursing care in practice. The study design was based on ethnographic methods and data were collected by diary keeping and semi-structured interviews. An organizational method based on the principles of primary nursing had been implemented on the ward for 2 years prior to the study commencing. As well as talking in general terms about primary nursing, the nursing staff talked at some length about specific issues related to their practice.     

GM1对脊髓损伤后神经细胞凋亡的影响

目的:观察神经节苷脂(ganglioside,GM1)对脊髓损伤后神经细胞凋亡的影响。方法:中度脊髓损伤大鼠随机分为对照组及治疗组,在蛛网膜下腔注射生理盐水或神经节苷脂,采用原位末端标记检测凋亡细胞DNA(TUNEL)、流式细胞仪磷脂结合蛋白V/碘化丙啶(AnnexinV/PI)双标检测凋亡细胞及荧光酶联测定法测定半胱氨酸天冬氨酸酶3(Caspase3)的活性。结果:对照组及治疗组均发现凋亡细胞阳性表达,且均在3d达到高峰,但GM1治疗组阳性表达显著低于对照组(P<0.05)。结论:神经节苷脂有阻断神经细胞凋亡的作用,对损伤脊髓组织有明显保护作用。     

葛根素对抗H2O2引起血管平滑肌细胞凋亡及坏死

目的：研究葛根素对过氧化氢引起无血清培养的小牛主动脉血管平滑肌细胞凋亡和坏死的影响。方法：通过体外细胞培养，以噻唑兰（MTT）法测定细胞存活率，用流式细胞术检测细胞DNA含量及凋亡细胞百分率；DNA琼脂糖凝胶电泳法观察细胞凋亡过程中DNA断裂程度。结果：H2O2诱导无血清培养的平滑肌细胞凋亡，葛根素可显著降低平滑肌细胞中凋亡细胞百分率，并减少凋亡细胞DNA断裂，同时也减少其引起的平滑肌细胞坏死。结论：葛根素可对抗H2O2引起的无血清培养的血管平滑肌细胞凋凋亡及坏死。     

人胎盘微绒毛膜的制备及其转铁蛋白受体研究

作者分别用差速离心法及蔗糖梯度离心法制备胎盘微绒毛膜(PMM),用受体放射分析法研究了PMM的转铁蛋白受体(TfB),结果表明:两种方法制备的PMM均可用于受体分析,但差速离心法更为简便。测定60例产妇PMM的TfR,其数目为3.53±1.98×10~(12)个位点/mg膜蛋白,最大结合容量为6.33±4.21×10~(-12)mol/mg膜蛋白,Kd值为4.95±3.39×10~(-9)mol/L。受体结合反应体系最适实验条件为,膜蛋白浓度每管50μg,标记物浓度每管50 000cpm,孵育30分钟,B/F分离的聚乙二醇浓度为12％(W/V)。对TfR的特性研究表明:TfR与转铁蛋白的结合具有高度亲和力、高度特异性及可饱和性。     

Efficacy of Lung Cancer Screening; Comparison of Results from a Case-Control Study and a Survival Analysis

A case-control study to evaluate the efficacy of lung cancer screening conducted by us showed that lung cancer screening may reduce the mortality of the disease up to 28%. Assuming this efficacy is unbiased, and that the screening rate is 51.6%, which was observed in the control group in the above study, the number of lung cancer deaths prevented by screening in the study period was calculated to be 47 for males and females combined. In the same study population, screen-detected lung cancer patients (N = 207) in the same study period were followed and the 7-year survival rate (46.9%) was compared to the 5-year survival rate (11.3%) obtained by the Osaka Cancer Registry, in which screen-detected lung cancer patients were only 1.8%. The number of lung cancer deaths prevented by screening, estimated by the difference in the above two survival rates, was 74 (95% confidence interval; 55–93). The number of lung cancer deaths prevented by screening estimated from the case-control study was significantly lower than that estimated from the survival analysis. This indicates that the efficacy of lung cancer screening estimated by the case-control study was within the range that could be explained by the actual long-term survivors among the screen-detected patients in the study population.