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   1416968篇
  免费   115308篇
  国内免费   3311篇
耳鼻咽喉   18537篇
儿科学   46773篇
妇产科学   41154篇
基础医学   201096篇
口腔科学   38219篇
临床医学   127128篇
内科学   284388篇
皮肤病学   33763篇
神经病学   117201篇
特种医学   54430篇
外国民族医学   464篇
外科学   212504篇
综合类   33011篇
一般理论   511篇
预防医学   110832篇
眼科学   31614篇
药学   99465篇
  1篇
中国医学   3281篇
肿瘤学   81215篇
  2019年   11789篇
  2018年   16637篇
  2017年   12723篇
  2016年   14350篇
  2015年   16089篇
  2014年   22869篇
  2013年   33939篇
  2012年   46213篇
  2011年   48764篇
  2010年   28588篇
  2009年   27423篇
  2008年   45070篇
  2007年   47569篇
  2006年   48163篇
  2005年   46644篇
  2004年   44496篇
  2003年   42366篇
  2002年   40858篇
  2001年   73493篇
  2000年   75005篇
  1999年   61705篇
  1998年   16206篇
  1997年   14555篇
  1996年   14689篇
  1995年   14873篇
  1994年   13482篇
  1993年   12675篇
  1992年   46197篇
  1991年   43888篇
  1990年   41867篇
  1989年   39886篇
  1988年   36472篇
  1987年   35670篇
  1986年   33168篇
  1985年   31590篇
  1984年   24022篇
  1983年   20182篇
  1982年   12322篇
  1981年   10880篇
  1979年   20885篇
  1978年   14709篇
  1977年   12169篇
  1976年   11406篇
  1975年   11690篇
  1974年   14094篇
  1973年   13653篇
  1972年   12741篇
  1971年   11579篇
  1970年   11027篇
  1969年   10170篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Post-induction hypotension is common and associated with postoperative complications. We hypothesised that pneumatic leg compression reduces post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy. In this double-blind randomised study, patients were allocated randomly to the pneumatic leg compression group (n = 50) or control (n = 50). In the intervention group, pneumatic leg compression was initiated before induction of anaesthesia. In the control group, pneumatic leg compression was initiated 20 min after anaesthesia induction. The primary outcome was the incidence of post-induction hypotension in these groups. Post-induction hypotension was defined as systolic blood pressure < 90 mmHg during the first 20 min after induction. Haemodynamic variables and area under the curve of post-induction systolic blood pressure over time were assessed. Complications associated with pneumatic leg compression were recorded, including: peripheral neuropathy; compartment syndrome; extensive bullae beneath the leg sleeves; and pulmonary thromboembolism. The incidence of post-induction hypotension decreased in the pneumatic leg compression group compared with that in the control group; 5 (10%) vs. 29 (58%), respectively, p < 0.001. In the pneumatic leg compression group, the lowest systolic, diastolic and mean blood pressures 20 min after induction of anaesthesia were significantly greater than the control group. Pneumatic leg compression resulted in an increased area under the curve of systolic blood pressure in the first 20 min after induction, p = 0.001. There were no pneumatic leg compression-related complications. Pneumatic leg compression reduced post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy, suggesting that it is an effective and safe intervention to prevent post-induction hypotension among elderly patients undergoing general anaesthesia.  相似文献   
2.
3.
Graefe's Archive for Clinical and Experimental Ophthalmology - To investigate comorbidities and medications associated with acute (ASCH) and delayed (DSCH) suprachoroidal hemorrhage (SCH), and...  相似文献   
4.
Khadka  J.  Ratcliffe  J.  Hutchinson  C.  Cleland  J.  Mulhern  B.  Lancsar  E.  Milte  R. 《Quality of life research》2022,31(9):2849-2865
Quality of Life Research - To evaluate the construct (convergent and known group) validity of the Quality-of-Life-Aged Care Consumer (QOL-ACC), an older-person-specific quality-of-life measure...  相似文献   
5.
Journal of the Association for Research in Otolaryngology - Cochlear implant (CI) users show limited sensitivity to the temporal pitch conveyed by electric stimulation, contributing to impaired...  相似文献   
6.
7.
The UK islet allotransplant program is nationally funded to deliver one or two transplants over 12 months to individuals with type 1 diabetes and recurrent severe hypoglycemia. Analyses were undertaken 10 years after program inception to evaluate associations between transplanted mass; single versus two transplants; time between two transplants and graft survival (stimulated C-peptide >50 pmol/L) and function. In total, 84 islet transplant recipients were studied. Uninterrupted graft survival over 12 months was attained in 23 (68%) single and 47 (94%) (p = .002) two transplant recipients (separated by [median (IQR)] 6 (3–8) months). 64% recipients of one or two transplants with uninterrupted function at 12 months sustained graft function at 6 years. Total transplanted mass was associated with Mixed Meal Tolerance Test stimulated C-peptide at 12 months (p < .01). Despite 1.9-fold greater transplanted mass in recipients of two versus one islet infusion (12 218 [9291–15 417] vs. 6442 [5156–7639] IEQ/kg; p < .0001), stimulated C-peptide was not significantly higher. Shorter time between transplants was associated with greater insulin dose reduction at 12 months (beta ?0.35; p = .02). Graft survival over the first 12 months was greater in recipients of two versus one islet transplant in the UK program, although function at 1 and 6 years was comparable. Minimizing the interval between 2 islet infusions may maximize cumulative impact on graft function.  相似文献   
8.
9.
Graefe's Archive for Clinical and Experimental Ophthalmology - The purpose of this study is to assess for histopathological changes within the retina and the choroid and determine the long-term...  相似文献   
10.
Graefe's Archive for Clinical and Experimental Ophthalmology - Ferromagnetic foreign bodies (FFB) present during magnetic resonance imaging (MRI) explorations can lead to tissue injury due to...  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