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   135140篇
  免费   46672篇
  国内免费   1156篇
耳鼻咽喉   2459篇
儿科学   4902篇
妇产科学   1430篇
基础医学   26039篇
口腔科学   6342篇
临床医学   17949篇
内科学   33446篇
皮肤病学   9317篇
神经病学   17319篇
特种医学   5384篇
外国民族医学   2篇
外科学   21463篇
综合类   1609篇
现状与发展   3篇
一般理论   38篇
预防医学   7442篇
眼科学   2641篇
药学   11246篇
  2篇
中国医学   1971篇
肿瘤学   11964篇
  2024年   59篇
  2023年   577篇
  2022年   1711篇
  2021年   3694篇
  2020年   6148篇
  2019年   12021篇
  2018年   11713篇
  2017年   12557篇
  2016年   13693篇
  2015年   14489篇
  2014年   14940篇
  2013年   15796篇
  2012年   9924篇
  2011年   9369篇
  2010年   11841篇
  2009年   7839篇
  2008年   5846篇
  2007年   4360篇
  2006年   3928篇
  2005年   3321篇
  2004年   2951篇
  2003年   2667篇
  2002年   2410篇
  2001年   2343篇
  2000年   2112篇
  1999年   1349篇
  1998年   491篇
  1997年   359篇
  1996年   281篇
  1995年   227篇
  1994年   189篇
  1993年   178篇
  1992年   396篇
  1991年   378篇
  1990年   310篇
  1989年   298篇
  1988年   269篇
  1987年   264篇
  1986年   192篇
  1985年   190篇
  1984年   127篇
  1983年   116篇
  1982年   60篇
  1981年   70篇
  1979年   88篇
  1978年   73篇
  1974年   65篇
  1973年   56篇
  1972年   52篇
  1970年   53篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Social Psychiatry and Psychiatric Epidemiology - The negative effect of catastrophic financial loss on suicide risk is widely perceived but hardly studied in-depth because of various difficulties...  相似文献   
3.
4.
ObjectiveSpinal cord stimulation (SCS) is an effective treatment in failed back surgery syndrome (FBSS). We studied the effect of preimplantation opioid use on SCS outcome and the effect of SCS on opioid use during a two-year follow-up period.Materials and methodsThe study cohort included 211 consecutive FBSS patients who underwent an SCS trial from January 1997 to March 2014. Participants were divided into groups, which were as follows: 1) SCS trial only (n = 47), 2) successful SCS (implanted and in use throughout the two-year follow-up period, n = 131), and 3) unsuccessful SCS (implanted but later explanted or revised due to inadequate pain relief, n = 29). Patients who underwent explantation for other reasons (n = 4) were excluded. Opioid purchase data from January 1995 to March 2016 were retrieved from national registries.ResultsHigher preimplantation opioid doses associated with unsuccessful SCS (ROC: AUC = 0.66, p = 0.009), with 35 morphine milligram equivalents (MME)/day as the optimal cutoff value. All opioids were discontinued in 23% of patients with successful SCS, but in none of the patients with unsuccessful SCS (p = 0.004). Strong opioids were discontinued in 39% of patients with successful SCS, but in none of the patients with unsuccessful SCS (p = 0.04). Mean opioid dose escalated from 18 ± 4 MME/day to 36 ± 6 MME/day with successful SCS and from 22 ± 8 MME/day to 82 ± 21 MME/day with unsuccessful SCS (p < 0.001).ConclusionsHigher preimplantation opioid doses were associated with SCS failure, suggesting the need for opioid tapering before implantation. With continuous SCS therapy and no explantation or revision due to inadequate pain relief, 39% of FBSS patients discontinued strong opioids, and 23% discontinued all opioids. This indicates that SCS should be considered before detrimental dose escalation.  相似文献   
5.
6.
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   
7.
8.
We report a case of benign lymphoplasmacytic plaque (LPP) in a child. These asymptomatic erythematous papulonodular lesions are an emerging clinicopathological entity. Herein, we describe a previously unreported site for LPP lesions, namely, the volar wrist and the distal ipsilateral palm.  相似文献   
9.
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