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   1400522篇
  免费   115094篇
  国内免费   3291篇
耳鼻咽喉   18343篇
儿科学   46436篇
妇产科学   41069篇
基础医学   199300篇
口腔科学   37657篇
临床医学   125300篇
内科学   281488篇
皮肤病学   33346篇
神经病学   116090篇
特种医学   53826篇
外国民族医学   464篇
外科学   210008篇
综合类   32698篇
一般理论   488篇
预防医学   109128篇
眼科学   31386篇
药学   98158篇
  1篇
中国医学   3267篇
肿瘤学   80454篇
  2019年   11646篇
  2018年   16567篇
  2017年   12668篇
  2016年   14203篇
  2015年   15996篇
  2014年   22566篇
  2013年   33420篇
  2012年   45413篇
  2011年   47984篇
  2010年   28192篇
  2009年   27076篇
  2008年   44300篇
  2007年   46799篇
  2006年   47352篇
  2005年   45838篇
  2004年   43738篇
  2003年   41631篇
  2002年   40138篇
  2001年   72916篇
  2000年   74385篇
  1999年   61190篇
  1998年   16030篇
  1997年   14397篇
  1996年   14548篇
  1995年   14694篇
  1994年   13348篇
  1993年   12521篇
  1992年   45796篇
  1991年   43483篇
  1990年   41489篇
  1989年   39554篇
  1988年   36154篇
  1987年   35346篇
  1986年   32858篇
  1985年   31273篇
  1984年   23800篇
  1983年   19989篇
  1982年   12181篇
  1981年   10737篇
  1979年   20688篇
  1978年   14562篇
  1977年   12051篇
  1976年   11321篇
  1975年   11594篇
  1974年   13978篇
  1973年   13522篇
  1972年   12641篇
  1971年   11470篇
  1970年   10908篇
  1969年   10075篇
排序方式: 共有10000条查询结果,搜索用时 328 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 - Ferromagnetic foreign bodies (FFB) present during magnetic resonance imaging (MRI) explorations can lead to tissue injury due to...  相似文献   
4.
5.
6.
7.
Journal of Molecular Medicine - Chronic exposure to high levels of particulate matter (PM) is correlated to a higher prevalence of cardio-metabolic disturbances. Adipose tissue represents a pivotal...  相似文献   
8.
9.
10.
Postbariatric loss of muscle tissue could negatively affect long-term health due to its role in various bodily processes, such as metabolism and functional capacity. This meta-analysis aimed to unravel time-dependent changes in the magnitude and progress of lean body mass (LBM), fat-free mass (FFM), and skeletal muscle mass (SMM) loss following bariatric surgery. A systematic literature search was conducted in Pubmed, Embase, and Web of Science. Fifty-nine studies assessed LBM (n = 37), FFM (n = 20), or SMM (n = 3) preoperatively and ≥1 time points postsurgery. Random-effects meta-analyses were performed to determine pooled loss per outcome parameter and follow-up time point. At 12-month postsurgery, pooled LBM loss was ?8.13 kg [95%CI ?9.01; ?7.26]. FFM loss and SMM loss were ?8.23 kg [95%CI ?10.74; ?5.73] and ?3.18 kg [95%CI ?5.64; ?0.71], respectively. About 55% of 12-month LBM loss occurred within 3-month postsurgery, followed by a more gradual decrease up to 12 months. Similar patterns were seen for FFM and SMM. In conclusion, >8 kg of LBM and FFM loss was observed within 1-year postsurgery. LBM, FFM, and SMM were predominantly lost within 3-month postsurgery, highlighting that interventions to mitigate such losses should be implemented perioperatively.  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