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   648篇
  免费   30篇
  国内免费   6篇
耳鼻咽喉   2篇
儿科学   41篇
妇产科学   14篇
基础医学   51篇
口腔科学   32篇
临床医学   56篇
内科学   206篇
皮肤病学   15篇
神经病学   13篇
特种医学   151篇
外科学   29篇
综合类   12篇
预防医学   16篇
眼科学   4篇
药学   23篇
中国医学   2篇
肿瘤学   17篇
  2024年   1篇
  2021年   8篇
  2020年   4篇
  2019年   4篇
  2018年   5篇
  2017年   5篇
  2016年   2篇
  2015年   9篇
  2014年   19篇
  2013年   13篇
  2012年   18篇
  2011年   13篇
  2010年   28篇
  2009年   32篇
  2008年   25篇
  2007年   13篇
  2006年   15篇
  2005年   8篇
  2004年   13篇
  2003年   10篇
  2002年   6篇
  2001年   10篇
  2000年   9篇
  1999年   14篇
  1998年   26篇
  1997年   38篇
  1996年   45篇
  1995年   31篇
  1994年   25篇
  1993年   35篇
  1992年   2篇
  1991年   5篇
  1990年   12篇
  1989年   11篇
  1988年   14篇
  1987年   21篇
  1986年   26篇
  1985年   14篇
  1984年   11篇
  1983年   9篇
  1982年   20篇
  1981年   7篇
  1980年   6篇
  1979年   7篇
  1978年   2篇
  1977年   11篇
  1976年   9篇
  1975年   10篇
  1973年   2篇
  1971年   1篇
排序方式: 共有684条查询结果,搜索用时 15 毫秒
681.

Background

Pregnancy-related low back pain is considered an important health problem and potentially leads to long-lasting pain and disability. Investigators draw particular attention to biomedical factors but there is growing evidence that psychosocial and social factors might be important. It prompted us to start a large cohort study (n = 7526) during pregnancy until one year after delivery and a nested randomized controlled intervention study in the Netherlands.

Methods

A randomized controlled trial (n = 126) nested within a cohort study, of brief self-management techniques versus usual care for treatment of women with persisting non-specific pregnancy-related low back pain three weeks after delivery. Women in the intervention group were referred to a participating physiotherapist. Women in the usual care group were free to choose physiotherapy, guidance by a general practitioner or no treatment. Follow up took place at 3 months, 6 months and one year after delivery. Outcomes included change in limitations in activities (RDQ), pain (VAS), severity of main complaints (MC), global feeling of recovery (GPE), impact on participation and autonomy (IPA), pain-related fear (TSK), SF-36, EuroQol and a cost diary. For the outcome measures, series of mixed models were considered. For the outcome variable global perceived effect (GPE) a logistic regression analysis is performed.

Results

Intention-to-treat outcomes showed a statistical significant better estimated regression coefficient RDQ -1.6 {-2.9;-0.5} associated with treatment, as well as better IPA subscale autonomy in self-care -1.0 {-1.9;-0.03} and TSK -2.4 {-3.8;-1.1} but were not clinical relevant over time. Average total costs in the intervention group were much lower than in usual care, primarily due to differences in utilization of sick leave but not statistically significant.

Conclusion

Brief self-management techniques applied in the first 3 months after delivery may be a more viable first-line approach but further research is needed to draw inference on costs and to determine whether no care is a better option in the long term.

Trial Registration

[ISRCTN08477490]  相似文献   
682.
Focal and confluent areas of periventricular hyperintensity have been reported on magnetic resonance (MR) images in 30% of patients over 60 years of age. In order to better understand the pathologic basis of these lesions, the authors studied 14 formalin-fixed brains with MR imaging. Multiple focal areas of hyperintensity were identified in the periventricular white matter in three of the 14 brains studied (21%). Subsequent gross and microscopic pathologic examination of both hyperintense and normal-intensity areas was performed on 87 tissue sections. The larger lesions were characterized centrally by necrosis, axonal loss, and demyelination and therefore represent true infarcts. Reactive astrocytes oriented along the degenerated axons were identified at distances of up to several centimeters from the central infarct. This is called isomorphic gliosis and is associated with increased intensity on T2-weighted images that increases the apparent size of the central lesion.  相似文献   
683.
目的总结同期胰肾联合移植(SPK)术的治疗效果和经验。方法自2002年1月至2003年9月,以SPK术治疗胰岛素依赖型糖尿病(IDDM)合并终末期肾病(ESRD)患者12例。每例受者接受来自同一供者的胰腺和肾脏,移植肾以经典方法植入左侧盆腔,胰腺植于右下腹。1例移植胰腺静脉与受者门静脉系统吻合,11例与体静脉系统吻合。胰腺外分泌引流方法为:3例移植物十二指肠段与受者十二指肠吻合,9例与空肠上段吻合。术前应用甲泼尼龙及抗胸腺细胞球蛋白作为免疫诱导,术后以他克莫司、霉酚酸酯和泼尼松三联抗排斥药物维持。结果术后平均随访时间23个月,受者、移植胰腺和移植肾的存活率分别为100%、91.7%和91.7%。1例再次行SPK术的受者,术后出现了超急性排斥反应,且未能逆转,于术后13d切除移植物;其余11例首次行SPK术的受者中,3例(28.3%)出现急性排斥,均获成功纠治。2例受者术后移植肾功能延迟恢复,行过渡性透析。11例首次行SPK术的移植胰腺术后立即发挥了功能,分别于术后1~5d内停用胰岛素。结论同期胰肾联合移植是胰岛素依赖型糖尿病合并终末期肾病患者的一种安全而有效的治疗方法。  相似文献   
684.
Objective. To determine the effects of short-term, maximum-tolerated-dose and long-term, optimum-dose iloprost treatment of severe pulmonary hypertension associated with systemic sclerosis (SSc) and the primary antiphospholipid syndrome (APS). Methods. Three patients with SSc and 2 with APS who had failed to respond to oral vasodilator therapy for pulmonary hypertension were enrolled in a 32-week, open, prospective trial. Short-term infusion of maximum-tolerated doses and continuous infusion of optimum doses of iloprost were carried out following baseline cardiac catheterization. Catheterization was repeated at 2 and 32 weeks. All 5 patients completed the study and continued therapy for an average of 82 weeks (range 58–103). Results. Acute infusion of maximum tolerated doses significantly ameliorated the cardiac index (0.92 liters/minute/m2; P < 0.01), pulmonary artery O2 saturation (10.6%; P < 0.05), and pulmonary resistance (−6.7 units; P < 0.05). After 2 weeks of continuous infusion of optimum doses, there was improvement in pulmonary resistance (⩾16%) and pulmonary artery O2 saturation ( > 30%) in the 2 patients with primary APS. After 2 and 32 weeks, the 3 SSc patients showed variable hemodynamic responses. New York Heart Association functional class and exercise tolerance improved in all patients. There was 1 episode of bacteremia, and 1 patient died after 72 weeks of study. Conclusion. Continuous iloprost infusion may improve exercise tolerance and quality of life in patients with severe pulmonary hypertension associated with SSc and primary APS.  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