Long-term survival in children under 3 years of age with low-grade astrocytoma

Objective The purpose of this study is to analyze clinical aspects and disease-free survival (DFS) in children less than 3 years of age diagnosed with low-grade astrocytoma. Methods In a period of 24 years (1980–2004), a total of 43 (5.4%) children were registered with these characteristics. Twenty-three patients had pilocytic astrocytoma, 18 diffused, and 2 mixed. Thirty-one (72.1%) children had incomplete surgical tumor resection and 12 (27.9%) had a complete tumor resection. Twelve (27.9%) patients had cranial radiotherapy and 17 (39.5%) received chemotherapy. Overall survival was recorded in 23 (53%). DFS was 50% at 250 months of follow-up for the whole group. DFS for the supratentorial group was 60% at 250 months, whereas, for the infratentorial, it was 22% at 120 months (p = 0.008). Conclusion The only favorable prognostic pattern was the supratentorial presentation. Radiotherapy and chemotherapy did not alter the outcome.     

视场角设置对虚拟环境中目标判断的影响

目的探讨不同视场角参数对虚拟环境中目标判断的影响规律 ,找出最佳视场角参数。方法利用自行研制基于PC平台的虚拟现实 (VR)实验系统 ,选定 45名年龄在 2 3～ 5 8岁被试者并完成大小与角度判断的实验设计。首先进行 30 0人次的预实验 ,确定引起虚拟环境中目标判断差错的视场角及相应观察任务的差别等级 ,然后开始单因素、4水平的完全随机正式实验。结果方差分析表明 ,不同的虚拟环境视场角对目标判断的真实性有显著性影响 ,当视场角为 60°时 ,目标判断的正确率最大。结论利用VR技术进行载人航天器工效设计、操作训练或其它任务的研究时 ,应考虑视场角的作用 ,适合目标大小判断的视场角参数值宜取 60°,以便获得最大的工效     

青光眼病人视野改变与行走速度的相关性研究

目的探讨青光眼病人的视野改变是否影响其行走速度。方法测量 71例青光眼病人的视野和走完一段规定路程所需时间 ,并与相同视力、年龄和性别的正常人进行对比。结果青光眼病人走完规定路程所需时间比正常人多 15 % ;早期青光眼组视野较正常组下降 (P <0 .0 5 ) ,而在行走时间上差异无显著性意义 (P >0 .0 5 ) ;中晚期青光眼组视野较正常组显著下降、行走时间明显增加 (均P <0 .0 1) ,且视野下降程度与所需时间呈显著正相关 (r =0 .78,P <0 .0 1)。结论中晚期青光眼病人的视野缺损可导致行走速度减慢 ,提示对该类病人就诊时要耐心、细致地加以引导 ,在日常生活中给予理解、关怀     

S95-100野战机动医疗系统及其应用

S95-100野战机动医疗系统是方舱式战地机动医院,由医用方舱、帐篷、专用车辆、运输集装箱等功能单元构成。本文讲述了检伤分类单元、手术单元、术前准备单元、急救单元、临床检验单元、药械供应单元、X线单元、卫生器材灭菌单元、卫勤作业单元、病房单元、勤务技术保障单元、通道联接单元的勤务功能;系统模块剪裁及多种变换的全系统展开部署;系统在部队进行了试验和扩大试用情况。     

一种具有高信噪比的脉搏波光电传感器的研制

目的：探讨研制一种生理信号光电传感器。方法：利用光电传感器检测通过指端毛细血管后的光强度的变化，将光信号转换成电信号，再经过电信号1/V转换、放大、滤波处理。结果：获得了清晰稳定的指端容积脉搏波。结论：高信噪比的光电传感器可用作于临床监测和生理信号分析处理系统。     

卡维地洛对冠心病患者血浆氧化修饰低密度脂蛋白的影响

目的 :观察临床应用卡维地洛能否降低冠心病患者血浆氧化修饰低密度脂蛋白 (Ox LDL)水平。方法 :选择确诊冠心病患者及年龄、性别相匹配的正常对照组各 30例。冠心病组卡维地洛平均用量为 (10± 2 .5 )mg/d ,共 4个月 ,于服药前、服药后2个月及 4个月 ,分别采集清晨空腹血 ,以检测Ox LDL ,丙二醛 (MDA)。结果 :冠心病组的Ox LDL、MDA水平显著高于对照组 ,在用药后 2及 4个月冠心病组Ox LDL较用药前有显著降低 (P <0 .0 5 ) ,MDA显示出类似的趋势 (P <0 .0 1)。结论 :卡维地洛具有抗氧化作用 ,可以降低冠心病患者血浆Ox LDL水平。     

Mifepristone-induced abortion and birth weight in the first subsequent pregnancy.

OBJECTIVES: To assess the effect of a medically induced abortion (MA) on birth weight in the first subsequent pregnancy. METHODS: Pregnant women who had had a MA, a surgical abortion (SA), or primigravidas with no history of abortion (NA), were recruited for a prospective cohort study between July 1998 and February 2001. The sample for the present analysis included 12995 singleton live births at term. RESULTS: The overall incidence rate of low birth weight (LBW) was 1.0%. The rates of LBW in the MA, SA, and NA groups were 1.0%, 0.9%, and 1.2, respectively. There were no significant differences in LBW rates between the MA and SA groups, neither between the MA and NA. Logistic regression analysis was used to estimate the effects of MA on birth weight, and we found no relationship between risk of LBW and MA. CONCLUSIONS: We did not find a statistically significant relationship between a history of one medically induced abortion and LBW for the first subsequent term pregnancy.     

Bilateral organized chronic subdural haematomas: High field magnetic resonance images and histological considerations

Summary The authors describe a 66-year-old man with progressive gait disturbance caused by bilateral organized chronic subdural haematomas. The characteristics of these lesions on magnetic resonance (MR) images have not yet been clarified. The organized haematoma in our patient exhibited slight hypo-intensity on T 1-weighted MR images and marked hypo-intensity on T 2-weighted MR images obtained at 1.5 T. Preoperative MR imaging may give us useful information about surgical strategy in the case of chronic subdural haematoma with an unusual appearance on computed tomographic (CT) scans.     

Auditory Perception and the Control of Spatially Coordinated Action of Deaf and Hearing Children

From birth onwards, auditory stimulation directs and intensifies visual orientation behaviour. In deaf children, by definition, auditory perception cannot take place and cannot, therefore, make a contribution to visual orientation to objects approaching from outside the initial field of view. In experiment 1, a difference in catching ability is demonstrated between deaf and hearing children (10-13 years of age) when the ball approached from the periphery or from outside the field of view. No differences in catching ability between the two groups occurred when the ball approached from within the field of view. A second experiment was conducted in order to determine if differences in catching ability between deaf and hearing children could be attributed to execution of slow orientating movements and/or slow reaction time as a result of the auditory loss. The deaf children showed slower reaction times. No differences were found in movement times between deaf and hearing children. Overall, the findings suggest that a lack of auditory stimulation during development can lead to deficiencies in the coordination of actions such as catching which are both spatially and temporally constrained.     

半乳糖化白蛋白磁性阿霉素纳米粒体外杀伤肝癌细胞的实验研究

目的 研究半乳糖化白蛋白磁性阿霉素纳米粒(Gal-MADM-NP M)在体外对人肝癌细胞系HepG2的杀伤作用。方法应用光镜、电镜下的形态学观察,DNA电泳以及四甲基偶氮唑蓝(MTT)比色法检测杀瘤活性。结果 形态出现明显改变,电镜证实出现细胞凋亡;白蛋白磁性阿霉素纳米粒联合磁场(MADM-NP M)组和半乳糖化白蛋白阿霉素纳米粒(Gal-ADM-NP)组抑制率及半数抑制率剂量相似(P>0.05),Gal-MADM-NP M组抑制率明显提高,半数抑制剂量明显降低(P<0.01)。结论MADM-NP M、Gal-ADM-NP、Gal-MADM-NP都具有明显抑制体外培养肝癌细胞生长增殖的作用。Gal-MADM-NP M对人肝癌细胞杀伤作用较性MADM-NP及Gal-ADM-NP为强,作用机制可能与半乳糖配体的特异性介导和人肝癌细胞上半乳糖受体的识别内吞作用及联合外磁场有关。