首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   96篇
  完全免费   4篇
  特种医学   100篇
  2015年   3篇
  2014年   6篇
  2013年   11篇
  2012年   15篇
  2011年   4篇
  2010年   5篇
  2009年   9篇
  2008年   5篇
  2007年   9篇
  2006年   7篇
  2005年   4篇
  2004年   2篇
  2003年   7篇
  2002年   3篇
  2001年   3篇
  2000年   4篇
  1999年   1篇
  1996年   1篇
  1992年   1篇
排序方式: 共有100条查询结果,搜索用时 62 毫秒
1.
面神经炎预后因素分析   总被引:12,自引:2,他引:10  
目的:了解影响面神经炎患者预后的因素。方法:对217例面神经炎的临床资料和预后进行统计学分析。结果:对患者预后显著影响的因素为:年龄、就诊时间、合并使用泼尼松、合并理疗。结论:发病后4d内治疗、合并使用激素及合并理疗可以显著改善面神经炎患者的预后。  相似文献
2.
OBJECTIVE: The purpose of our study was to evaluate the efficacy of FDG PET and bone SPECT for diagnosing bone metastases in breast cancer. SUBJECTS AND METHODS: The study was a prospective series of 15 patients with breast cancer who underwent both PET and bone scanning with SPECT. Comparison was performed on a lesion-by-lesion analysis. MDCT, MRI, and the patient's clinical course were used as references. RESULTS: In the lesion-by-lesion analysis (n = 900), the sensitivity for diagnosing bone metastases was 85% for SPECT and 17% for PET, specificity was 99% for SPECT and 100% for PET, and accuracy was 96% for SPECT and 85% for PET. In the statistical analysis, bone SPECT was significantly superior to FDG PET for its sensitivity (p < 0.0001) and accuracy (p < 0.0001). No statistically significant difference was seen with regard to specificity. When classifying the bone metastases as osteoblastic or osteolytic, bone scanning classified 92% of metastases as osteoblastic and 35% of metastases as osteolytic, whereas PET classified 6% of metastases as osteoblastic and 90% of metastases as osteolytic. CONCLUSION: Bone SPECT is superior to FDG PET in detecting bone metastases in breast cancer. The sensitivity of osteoblastic lesions is limited with FDG PET. Surveillance of metastatic spread to the skeleton in breast cancer patients based on FDG PET alone is not possible.  相似文献
3.
4.
氩氦刀冷冻术配合肝动脉化疗栓塞术治疗原发性肝癌   总被引:9,自引:2,他引:7  
目的探讨氩氦刀冷冻术配合肝动脉化疗栓塞术治疗原发性肝癌的疗效。方法124例原发性肝癌患者随机分成两组,对照组64例,行肝动脉化疗栓塞治疗;联合治疗组60例,行肝动脉化疗栓塞治疗加氩氦刀冷冻术。肝动脉化疗栓塞一般每月进行1次,3次为一疗程;冷冻治疗一般每一疗程进行1~3次。结果对照组总有效率(CR PR)45.3%,联合治疗组为68.3%,两组间差异有显著性。对照组半年、1年、1年半的生存率,分别为81.3%、62.5%、43.8%,联合治疗组分别为93.3%、83.3%、63.3%,1年和1年半的生存率有显著差异。结论氩氦刀冷冻术配合肝动脉化疗栓塞术治疗原发性肝癌是一种有效的方法,可以延长患者的生存期。  相似文献
5.
观察肝细胞生长因子(HGF)对体外培养的牛冠状动脉血管内皮细胞 (BCAEC)、牛冠状动脉血管平滑肌细胞 (BCASMC)和小鼠心肌细胞血管内皮细胞生长因子(VEGF)分泌的影响。BCAEC对照组与HGF组 12hVEGF浓度分别为 10 5 1± 2 90和 9 31± 2 78pg/ml;BCASMC对照组和HGF组 12hVEGF浓度分别为 3h的 3 35倍和 3 93倍 ,HGF组 3h和 12hVEGF浓度分别为对照组的 2 0 6倍和 2 4 2倍 ;心肌细胞对照组和HGF组 12hVEGF浓度分别为 3h的 5 4 3倍和 4 0 9倍 ,HGF组 3h和 12hVEGF浓度分别为对照组的 2 74倍和 2 0 6倍。提示BCAEC、BCASMC及小鼠心肌细胞均具有自分泌VEGF的作用 ,HGF促进BCASMC和心肌细胞VEGF的分泌 ,对BCAEC无影响  相似文献
6.
大鼠睡眠剥夺后下丘脑一氧化氮合酶mRNA表达的变化   总被引:7,自引:0,他引:7  
目的观察快动眼睡眠剥夺大鼠下丘脑神经元型一氧化氮合酶 (nNOS )及诱导型一氧化氮合酶(iNOS )mRNA表达的时相变化。方法小站台水环境法剥夺大鼠睡眠 2 4h、48h及 72h后 ,用半定量逆转录聚合酶链反应 (RT -PCR )检测其下丘脑nNOS及iNOSmRNA的表达。结果睡眠剥夺 2 4h组nNOSmRNA表达量显著增加 (P <0 .0 1 ) ,剥夺 48h组与对照组比较无显著差异 ,剥夺 72h组nNOSmRNA的表达量低于对照组水平 (P <0 .0 5 ) ;睡眠剥夺 2 4h和 48h组iNOSmRNA的表达量无显著变化 ,但剥夺 72h组iNOSmRNA的表达量大幅度增加 (P <0 .0 1 )。结论睡眠剥夺后NOS基因表达增加 ,可能是睡眠“反跳”现象的机理之一 ;持续的睡眠剥夺状态下较高水平的NO还可能参与了睡眠剥夺对机体功能的损伤  相似文献
7.
下颌骨三维重建效果的测量分析研究   总被引:6,自引:0,他引:6  
目的分析和评价下颌骨三维重建的效果其及影响因素,为以下颌骨三维重建为基础的相关研究和临床应用提供参考。方法利用CT扫描获取下颌骨标本的断层解剖信息并以DICOM格式输出,然后采用三维重建软件进行重建,大体观察重建效果后,利用软件以有关解剖标志为测量点,对下颌骨重建模型的下颌骨体厚度、下颌骨升支前后径进行测量,测量结果与下颌骨标本的相应测量结果进行比较。结果CT扫描空间分辨率高,下颌骨三维重建的效果良好,对比测量分析表明重建模型与下颌骨标本无明显差异。结论基于CT扫描的下颌骨三维重建能满足相关科研和临床应用的需要。  相似文献
8.
积雪草总苷元抗抑郁作用机制的初步研究   总被引:4,自引:0,他引:4  
目的探讨积雪草总苷元的抗抑郁作用机制。方法采用育亨宾毒性增强实验、阿朴吗啡致刻板运动实验、5-羟色胺酸诱导甩头实验、单胺氧化酶抑制实验等多种动物模型探讨积雪草总苷元抗抑郁作用的可能机制。结果积雪草总苷元不协同育亨宾和阿朴吗啡对小鼠的作用,但显著增加5-羟色氨酸致小鼠甩头作用和盐酸色胺致癫痫样作用。结论积雪草总苷元抗抑郁作用可能与其增加5-羟色胺能神经系统、抑制单胺氧化酶(MAO)有关。  相似文献
9.
Kim TH  Cho KH  Pyo HR  Lee JS  Zo JI  Lee DH  Lee JM  Kim HY  Hwangbo B  Park SY  Kim JY  Shin KH  Kim DY 《Radiology》2005,235(1):208-215
PURPOSE: To retrospectively evaluate dose-volumetric parameters for association with risk of severe (grade >/=3) radiation pneumonitis (RP) in patients after three-dimensional (3D) conformal radiation therapy for lung cancer. MATERIALS AND METHODS: The study was approved by the institutional review board, which did not require informed consent. Data from 76 patients (66 men, 10 women; median age, 60 years; range, 35-79 years) with histologically proved lung cancer treated curatively with 3D conformal radiation therapy between August 2001 and October 2002 were retrospectively analyzed. Twenty patients underwent surgery before radiation therapy; 57 patients received chemotherapy. Median total radiation dose of 60 Gy (range, 54-66 Gy) was delivered in 30 (range, 27-33) fractions over 6 weeks. RP was scored by using Radiation Therapy Oncology Group criteria. Clinical parameters were analyzed. Dose-volumetric parameters analyzed were percentage of lung volume that received a dose of 20 Gy or more (V20), 30 Gy or more (V30), 40 Gy or more (V40), or 50 Gy or more (V50); mean lung dose (MLD); normal tissue complication probability (NTCP); and total dose. Fisher exact test was performed to compare clinical parameters between patients who developed severe RP and those who did not. Univariate and multivariate logistic regression analyses were performed to evaluate data for association between dose-volumetric parameters and severe RP. Pearson chi(2) test was used to assess data for correlations among dose-volumetric parameters. P < or = .05 was considered to indicate statistically significant difference. RESULTS: Of 76 patients, 30 (39%) did not develop RP; 23 (30%) developed RP of grade 1; 11 (14%), grade 2; 11 (14%), grade 3; and 1 (1%), grade 4. None had grade 5 RP. Age (< 60 vs > or =60), sex, Karnofsky performance status (< 70 vs > or =70), forced expiratory volume in 1 second, presence of weight loss, preexisting lung disease, history of thoracic surgery, and history of chemotherapy did not significantly differ between patients who developed severe RP and those who did not. In univariate analyses, MLD, V20, V30, V40, V50, and NTCP were associated with severe RP (P < .05). In multivariate analysis, MLD was the only variable associated with severe RP. CONCLUSION: MLD is a useful indicator of risk for development of severe RP after 3D conformal radiation therapy in patients with lung cancer.  相似文献
10.
观察肝细胞生长因子 (HGF)及血管内皮细胞生长因子 (VEGF)对牛冠状动脉血管内皮细胞 (BCAEC)和平滑肌细胞(BCASMC)增殖的影响。分离和培养BCAEC、BCASMC ,VEGF组和HGF组细胞培养液分别含VEGF 5 0ng/ml和HGF 5 0ng/ml,采用四甲基偶氮唑蓝法观察细胞的增殖。结果显示 ,对照组、HGF组和VEGF组BCAEC的OD值分别为 0 2 3± 0 0 2、0 5 8± 0 10和 0 4 2± 0 12 ;BCASMC的OD值分别为 0 31± 0 0 8、0 4 5± 0 0 9和 0 4 0± 0 11;HGF对BCAEC、BCASMC的增殖率分别为 15 2 2 %± 33 8%、45 2 %±2 5 3%,VEGF对BCAEC、BCASMC的增殖率分别为 82 6 %± 18 7%、2 9 0 %± 2 0 4 %。提示HGF对BCAEC、BCASMC的增殖均有促进作用 ;VEGF能促进BCAEC的增殖 ,而对BCASMC的增殖作用不明显。HGF对BCAEC的增殖作用强于对BCASMC的作用 ;HGF对BCAEC的增殖作用强于VEGF。  相似文献
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号