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   34044篇
  免费   5721篇
  国内免费   117篇
耳鼻咽喉   395篇
儿科学   731篇
妇产科学   1912篇
基础医学   2813篇
口腔科学   473篇
临床医学   16567篇
内科学   4616篇
皮肤病学   454篇
神经病学   2197篇
特种医学   1007篇
外科学   3068篇
综合类   144篇
一般理论   2篇
预防医学   2428篇
眼科学   547篇
药学   1094篇
中国医学   20篇
肿瘤学   1414篇
  2023年   807篇
  2022年   177篇
  2021年   391篇
  2020年   711篇
  2019年   382篇
  2018年   1309篇
  2017年   1514篇
  2016年   1690篇
  2015年   1762篇
  2014年   1848篇
  2013年   2174篇
  2012年   1259篇
  2011年   1445篇
  2010年   1544篇
  2009年   1829篇
  2008年   1327篇
  2007年   1341篇
  2006年   1400篇
  2005年   1314篇
  2004年   1211篇
  2003年   1061篇
  2002年   1054篇
  2001年   799篇
  2000年   541篇
  1999年   689篇
  1998年   784篇
  1997年   858篇
  1996年   787篇
  1995年   691篇
  1994年   515篇
  1993年   432篇
  1992年   386篇
  1991年   387篇
  1990年   385篇
  1989年   336篇
  1988年   293篇
  1987年   249篇
  1986年   227篇
  1985年   265篇
  1984年   220篇
  1983年   181篇
  1982年   153篇
  1981年   174篇
  1980年   120篇
  1979年   186篇
  1978年   140篇
  1977年   152篇
  1976年   142篇
  1975年   115篇
  1972年   164篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Patient navigation is a strategy for overcoming barriers to reduce disparities and to improve access and outcomes. The aim of this umbrella review was to identify, critically appraise, synthesize, and present the best available evidence to inform policy and planning regarding patient navigation across the cancer continuum. Systematic reviews examining navigation in cancer care were identified in the Cochrane Central Register of Controlled Trials (CENTRAL), PubMed, Embase, Cumulative Index of Nursing and Allied Health (CINAHL), Epistemonikos, and Prospective Register of Systematic Reviews (PROSPERO) databases and in the gray literature from January 1, 2012, to April 19, 2022. Data were screened, extracted, and appraised independently by two authors. The JBI Critical Appraisal Checklist for Systematic Review and Research Syntheses was used for quality appraisal. Emerging literature up to May 25, 2022, was also explored to capture primary research published beyond the coverage of included systematic reviews. Of the 2062 unique records identified, 61 systematic reviews were included. Fifty-four reviews were quantitative or mixed-methods reviews, reporting on the effectiveness of cancer patient navigation, including 12 reviews reporting costs or cost-effectiveness outcomes. Seven qualitative reviews explored navigation needs, barriers, and experiences. In addition, 53 primary studies published since 2021 were included. Patient navigation is effective in improving participation in cancer screening and reducing the time from screening to diagnosis and from diagnosis to treatment initiation. Emerging evidence suggests that patient navigation improves quality of life and patient satisfaction with care in the survivorship phase and reduces hospital readmission in the active treatment and survivorship care phases. Palliative care data were extremely limited. Economic evaluations from the United States suggest the potential cost-effectiveness of navigation in screening programs.  相似文献   
2.

Purpose

Endovascular treatment with mechanical thrombectomy devices demonstrated high recanalization rates but functional outcome did not correlate with high rates of recanalization obtained. Patient selection prior to the endovascular treatment is very important in the final outcome of the patient. The primary aim of our study was to evaluate the prognostic value of posterior circulation Alberta Stroke Program Early CT Score (pc-ASPECTS) and Pons-Midbrain Index (PMI) scores in patients with Basilar Artery Occlusion (BAO) treated with successful angiographic recanalization after mechanical thrombectomy.

Methods

Retrospective single-center study including 18 patients between 2008 and 2013 who had acute basilar artery occlusion managed with endovascular treatment within 24 hours from symptoms onset and with successful angiographic recanalization. The patients were initially classified into two groups according to clinical outcome and mortality at 90 days. For analysis we also divided patients into groups based on pc-ASPECTS (≥8vs.< 8) and PMI (≥3vs.< 3) on non-contrast CT (NCCT) and CT Angiography Source Images (CTASI). Imaging data were correlated to clinical outcome and mortality rate.

Results

CTASI pc-ASPECTS, dichotomized at < 8 versus≥8, was associated with a favorable outcome (RR: 2.6; 95% CI: 1.3-5.2) and a reduced risk of death (RR: 6.5: 95% CI: 7.8-23.3). All patients that survived and were functionally independent had pc-ASPECTS score≥8. None of the 5 patients with CTASI pc-ASPECTS score less than 8 survived.

Conclusion

PC-ASPECTS on CTASI is helpful for predicting functional outcome after BAO recanalization with endovascular treatment. These results should be validated in a randomized controlled trial in order to decide whether or not to treat a patient with BAO.  相似文献   
3.
4.
5.
6.
7.
8.
9.
10.
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