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   1402837篇
  免费   115683篇
  国内免费   3322篇
耳鼻咽喉   18380篇
儿科学   46510篇
妇产科学   41109篇
基础医学   199495篇
口腔科学   37661篇
临床医学   125535篇
内科学   282493篇
皮肤病学   33352篇
神经病学   116230篇
特种医学   53877篇
外国民族医学   467篇
外科学   210278篇
综合类   32713篇
现状与发展   3篇
一般理论   489篇
预防医学   109521篇
眼科学   31400篇
药学   98461篇
  1篇
中国医学   3267篇
肿瘤学   80600篇
  2019年   11732篇
  2018年   16638篇
  2017年   12731篇
  2016年   14333篇
  2015年   16086篇
  2014年   22646篇
  2013年   33517篇
  2012年   45561篇
  2011年   48099篇
  2010年   28241篇
  2009年   27142篇
  2008年   44490篇
  2007年   46980篇
  2006年   47540篇
  2005年   46007篇
  2004年   43870篇
  2003年   41713篇
  2002年   40200篇
  2001年   72964篇
  2000年   74439篇
  1999年   61223篇
  1998年   16044篇
  1997年   14399篇
  1996年   14553篇
  1995年   14705篇
  1994年   13364篇
  1993年   12530篇
  1992年   45836篇
  1991年   43519篇
  1990年   41508篇
  1989年   39595篇
  1988年   36178篇
  1987年   35365篇
  1986年   32860篇
  1985年   31290篇
  1984年   23806篇
  1983年   19987篇
  1982年   12181篇
  1981年   10739篇
  1979年   20667篇
  1978年   14558篇
  1977年   12042篇
  1976年   11320篇
  1975年   11595篇
  1974年   13978篇
  1973年   13523篇
  1972年   12635篇
  1971年   11466篇
  1970年   10904篇
  1969年   10067篇
排序方式: 共有10000条查询结果,搜索用时 31 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