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   1399970篇
  免费   113851篇
  国内免费   3285篇
耳鼻咽喉   18345篇
儿科学   46478篇
妇产科学   40924篇
基础医学   199032篇
口腔科学   37612篇
临床医学   124732篇
内科学   281166篇
皮肤病学   33308篇
神经病学   115990篇
特种医学   53728篇
外国民族医学   466篇
外科学   210094篇
综合类   32664篇
一般理论   487篇
预防医学   108811篇
眼科学   31503篇
药学   98105篇
  1篇
中国医学   3267篇
肿瘤学   80393篇
  2019年   11557篇
  2018年   16387篇
  2017年   12532篇
  2016年   14119篇
  2015年   15820篇
  2014年   22493篇
  2013年   33350篇
  2012年   45385篇
  2011年   47941篇
  2010年   28131篇
  2009年   27013篇
  2008年   44330篇
  2007年   46868篇
  2006年   47411篇
  2005年   45887篇
  2004年   43765篇
  2003年   41668篇
  2002年   40166篇
  2001年   72934篇
  2000年   74423篇
  1999年   61221篇
  1998年   16038篇
  1997年   14388篇
  1996年   14553篇
  1995年   14699篇
  1994年   13348篇
  1993年   12520篇
  1992年   45820篇
  1991年   43492篇
  1990年   41489篇
  1989年   39556篇
  1988年   36157篇
  1987年   35367篇
  1986年   32861篇
  1985年   31279篇
  1984年   23800篇
  1983年   19985篇
  1982年   12166篇
  1981年   10732篇
  1979年   20671篇
  1978年   14545篇
  1977年   12026篇
  1976年   11295篇
  1975年   11584篇
  1974年   13949篇
  1973年   13502篇
  1972年   12616篇
  1971年   11453篇
  1970年   10909篇
  1969年   10066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