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   1400744篇
  免费   115531篇
  国内免费   3315篇
耳鼻咽喉   18344篇
儿科学   46433篇
妇产科学   41102篇
基础医学   199155篇
口腔科学   37831篇
临床医学   125289篇
内科学   281917篇
皮肤病学   33334篇
神经病学   116031篇
特种医学   53774篇
外国民族医学   464篇
外科学   210093篇
综合类   32710篇
现状与发展   3篇
一般理论   490篇
预防医学   109192篇
眼科学   31387篇
药学   98192篇
  1篇
中国医学   3266篇
肿瘤学   80582篇
  2019年   11668篇
  2018年   16580篇
  2017年   12669篇
  2016年   14264篇
  2015年   16014篇
  2014年   22568篇
  2013年   33400篇
  2012年   45408篇
  2011年   47951篇
  2010年   28174篇
  2009年   27070篇
  2008年   44354篇
  2007年   46848篇
  2006年   47424篇
  2005年   45886篇
  2004年   43763篇
  2003年   41661篇
  2002年   40117篇
  2001年   72894篇
  2000年   74393篇
  1999年   61186篇
  1998年   16031篇
  1997年   14390篇
  1996年   14541篇
  1995年   14696篇
  1994年   13345篇
  1993年   12526篇
  1992年   45796篇
  1991年   43495篇
  1990年   41491篇
  1989年   39554篇
  1988年   36164篇
  1987年   35349篇
  1986年   32852篇
  1985年   31275篇
  1984年   23812篇
  1983年   19980篇
  1982年   12175篇
  1981年   10732篇
  1979年   20668篇
  1978年   14554篇
  1977年   12045篇
  1976年   11327篇
  1975年   11588篇
  1974年   13981篇
  1973年   13525篇
  1972年   12632篇
  1971年   11462篇
  1970年   10901篇
  1969年   10067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.
4.
5.
6.
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   
7.
8.
9.
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   
10.
Maternal and Child Health Journal - Early life exposures can have an impact on a child’s developmental trajectory and children born late preterm (34–36&nbsp;weeks gestational age)...  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