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   81123篇
  免费   5816篇
  国内免费   214篇
耳鼻咽喉   993篇
儿科学   2132篇
妇产科学   2036篇
基础医学   13061篇
口腔科学   2389篇
临床医学   8035篇
内科学   16403篇
皮肤病学   1299篇
神经病学   7660篇
特种医学   3148篇
外国民族医学   45篇
外科学   10036篇
综合类   635篇
一般理论   92篇
预防医学   6670篇
眼科学   1445篇
药学   5952篇
中国医学   265篇
肿瘤学   4857篇
  2022年   562篇
  2021年   1511篇
  2020年   950篇
  2019年   1429篇
  2018年   1795篇
  2017年   1267篇
  2016年   1439篇
  2015年   1765篇
  2014年   2072篇
  2013年   3362篇
  2012年   4545篇
  2011年   4673篇
  2010年   2972篇
  2009年   2482篇
  2008年   3957篇
  2007年   4100篇
  2006年   4032篇
  2005年   3800篇
  2004年   3820篇
  2003年   3461篇
  2002年   3449篇
  2001年   2290篇
  2000年   2325篇
  1999年   2090篇
  1998年   962篇
  1997年   808篇
  1996年   737篇
  1995年   726篇
  1994年   598篇
  1993年   646篇
  1992年   1506篇
  1991年   1438篇
  1990年   1387篇
  1989年   1353篇
  1988年   1131篇
  1987年   1145篇
  1986年   1094篇
  1985年   996篇
  1984年   744篇
  1983年   680篇
  1982年   494篇
  1981年   487篇
  1980年   409篇
  1979年   645篇
  1978年   390篇
  1977年   374篇
  1975年   390篇
  1974年   427篇
  1973年   355篇
  1972年   351篇
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
1.
2.
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   
3.
4.
5.
6.
7.
8.
9.
Clinical Oral Investigations - The aim of this study was the analysis of WNT10A variants in seven families of probands with various forms of tooth agenesis and self-reported family history of...  相似文献   
10.
The aim of this study was to analyse the effect of body mass index (BMI), both low and high values, on the perioperative complication rate in patients with oral squamous cell carcinoma (OSCC). The medical records of 259 patients operated between 2014 and 2017 for OSCC were reviewed. Univariate and multivariate analyses were performed. Sixty of the 259 patients developed 87 complications. Low or high BMI was not associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade. Low BMI, American Society of Anesthesiologists score 2 and 3, a longer operating time, and increased blood loss were associated with a longer hospital stay. Low BMI was associated with a longer hospital stay. Neither low nor high BMI was associated with the perioperative complication rate. A longer operating time and increased blood loss were associated with a higher perioperative complication rate and higher Clavien–Dindo grade.  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