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   67892篇
  免费   3767篇
  国内免费   272篇
耳鼻咽喉   845篇
儿科学   1657篇
妇产科学   1408篇
基础医学   9062篇
口腔科学   3426篇
临床医学   5424篇
内科学   16021篇
皮肤病学   1688篇
神经病学   6087篇
特种医学   1472篇
外国民族医学   1篇
外科学   8335篇
综合类   415篇
一般理论   19篇
预防医学   6226篇
眼科学   1458篇
药学   4667篇
  1篇
中国医学   373篇
肿瘤学   3346篇
  2023年   551篇
  2022年   1240篇
  2021年   2360篇
  2020年   1262篇
  2019年   2067篇
  2018年   2468篇
  2017年   1597篇
  2016年   1726篇
  2015年   2032篇
  2014年   2686篇
  2013年   3452篇
  2012年   5353篇
  2011年   5679篇
  2010年   2980篇
  2009年   2545篇
  2008年   4314篇
  2007年   4298篇
  2006年   3924篇
  2005年   3676篇
  2004年   3411篇
  2003年   2922篇
  2002年   2679篇
  2001年   1126篇
  2000年   1111篇
  1999年   934篇
  1998年   448篇
  1997年   344篇
  1996年   315篇
  1995年   236篇
  1994年   225篇
  1993年   176篇
  1992年   374篇
  1991年   364篇
  1990年   327篇
  1989年   236篇
  1988年   230篇
  1987年   225篇
  1986年   199篇
  1985年   177篇
  1984年   172篇
  1983年   137篇
  1982年   103篇
  1981年   110篇
  1980年   86篇
  1979年   101篇
  1978年   80篇
  1975年   65篇
  1974年   72篇
  1971年   66篇
  1967年   68篇
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
1.
2.
3.
International Journal of Clinical Oncology - Immune-checkpoint inhibitors (ICIs) are standard treatments for metastatic non-small cell lung cancer (NSCLC). Patients with poor performance status...  相似文献   
4.
5.
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   
6.
7.
8.
9.
In the current immunosuppressive therapy era, vessel thrombosis is the most common cause of early graft loss after renal transplantation. The prevalence of IgA anti–β2-glycoprotein I antibodies (IgA-aB2GPI-ab) in patients on dialysis is elevated (>30%), and these antibodies correlate with mortality and cardiovascular morbidity. To evaluate the effect of IgA-aB2GPI-ab in patients with transplants, we followed all patients transplanted from 2000 to 2002 in the Hospital 12 de Octubre prospectively for 10 years. Presence of IgA-aB2GPI-ab in pretransplant serum was examined retrospectively. Of 269 patients, 89 patients were positive for IgA-aB2GPI-ab (33%; group 1), and the remaining patients were negative (67%; group 2). Graft loss at 6 months post-transplant was significantly higher in group 1 (10 of 89 versus 3 of 180 patients in group 2; P=0.002). The most frequent cause of graft loss was thrombosis of the vessels, which was observed only in group 1 (8 of 10 versus 0 of 3 patients in group 2; P=0.04). Multivariate analysis showed that the presence of IgA-aB2GPI-ab was an independent risk factor for early graft loss (P=0.04) and delayed graft function (P=0.04). There were no significant differences regarding patient survival between the two groups. Graft survival was similar in both groups after 6 months. In conclusion, patients with pretransplant IgA-aB2GPI-ab have a high risk of early graft loss caused by thrombosis and a high risk of delayed graft function. Therefore, pretransplant IgA-aB2GPI-ab may have a detrimental effect on early clinical outcomes after renal transplantation.  相似文献   
10.
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