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   1463496篇
  免费   120102篇
  国内免费   3477篇
耳鼻咽喉   18868篇
儿科学   48365篇
妇产科学   42133篇
基础医学   207491篇
口腔科学   39288篇
临床医学   132184篇
内科学   294733篇
皮肤病学   34189篇
神经病学   122169篇
特种医学   55853篇
外国民族医学   465篇
外科学   218595篇
综合类   33578篇
现状与发展   3篇
一般理论   563篇
预防医学   115102篇
眼科学   32825篇
药学   102679篇
  2篇
中国医学   3350篇
肿瘤学   84640篇
  2021年   10956篇
  2019年   12815篇
  2018年   17994篇
  2017年   13739篇
  2016年   15446篇
  2015年   17361篇
  2014年   24552篇
  2013年   36216篇
  2012年   49843篇
  2011年   52499篇
  2010年   30798篇
  2009年   29380篇
  2008年   48572篇
  2007年   51568篇
  2006年   51956篇
  2005年   50221篇
  2004年   47899篇
  2003年   45400篇
  2002年   43813篇
  2001年   73561篇
  2000年   74886篇
  1999年   61795篇
  1998年   16725篇
  1997年   14959篇
  1996年   15035篇
  1995年   15223篇
  1994年   13812篇
  1993年   12945篇
  1992年   46229篇
  1991年   43876篇
  1990年   41808篇
  1989年   39857篇
  1988年   36460篇
  1987年   35616篇
  1986年   33138篇
  1985年   31568篇
  1984年   24139篇
  1983年   20323篇
  1982年   12550篇
  1981年   11077篇
  1979年   20873篇
  1978年   14780篇
  1977年   12226篇
  1976年   11465篇
  1975年   11699篇
  1974年   14100篇
  1973年   13653篇
  1972年   12727篇
  1971年   11564篇
  1970年   10981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.
Journal of Neuro-Oncology - Adjuvant radiation is often used in patients with low grade gliomas with high-risk characteristics with a recommended dose of 45–54&nbsp;Gy. We used the...  相似文献   
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