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   1602278篇
  免费   131714篇
  国内免费   2582篇
耳鼻咽喉   21679篇
儿科学   52941篇
妇产科学   46239篇
基础医学   227862篇
口腔科学   47209篇
临床医学   140973篇
内科学   315019篇
皮肤病学   34094篇
神经病学   130152篇
特种医学   64734篇
外国民族医学   474篇
外科学   243898篇
综合类   39724篇
现状与发展   3篇
一般理论   544篇
预防医学   122892篇
眼科学   36536篇
药学   121298篇
  3篇
中国医学   2975篇
肿瘤学   87325篇
  2018年   14781篇
  2016年   12913篇
  2015年   15043篇
  2014年   20665篇
  2013年   31369篇
  2012年   42563篇
  2011年   44785篇
  2010年   26350篇
  2009年   25326篇
  2008年   43020篇
  2007年   45263篇
  2006年   46084篇
  2005年   44697篇
  2004年   44108篇
  2003年   42191篇
  2002年   41309篇
  2001年   75700篇
  2000年   78343篇
  1999年   66402篇
  1998年   17740篇
  1997年   16343篇
  1996年   16319篇
  1995年   16027篇
  1994年   15076篇
  1993年   14224篇
  1992年   55437篇
  1991年   53794篇
  1990年   52580篇
  1989年   50851篇
  1988年   47234篇
  1987年   46582篇
  1986年   44297篇
  1985年   42854篇
  1984年   32040篇
  1983年   27572篇
  1982年   16145篇
  1981年   14439篇
  1980年   13571篇
  1979年   30467篇
  1978年   21069篇
  1977年   17769篇
  1976年   16698篇
  1975年   17576篇
  1974年   21493篇
  1973年   20677篇
  1972年   18859篇
  1971年   17772篇
  1970年   16295篇
  1969年   15271篇
  1968年   13952篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
991.
992.
993.
994.
OBJECTIVES: Angioplasty is often used in the management of lower limb ischaemia and can reduce the need for infrainguinal bypass in some patients. There is an associated failure rate with this technique and bypass surgery is often used in this situation as a secondary limb salvage procedure. We aimed to evaluate the outcome of infrainguinal bypass grafting following failed attempt at angioplasty. METHODS: All cases of infrainguinal bypass at a single centre over a seven year period were identified and notes reviewed. Cases were divided into four groups according to their indication for surgery; acute ischaemia, chronic critical ischaemia, failed angioplasty and an 'other' group including aneurysmal disease and claudicants. The failed angioplasty group was compared with the other three groups. Survival analysis was performed using Kaplan Meier curves and groups compared in terms of long term patency and survival. RESULTS: Primary patency was 61.2% in the failed angioplasty group at 12 months compared with 60.6% in the other groups (P=1.11). There was also no significant difference in primary patency at 60 months (50% vs 40.6%, P=0.26). Survival at 12 months was also comparable between the groups (failed angioplasty group 74.2% compared with 77.3% in the other groups, P=0.662) as was 60 months survival (33.3% and 35.4% respectively, P=0.166). DISCUSSION: In this study, outcome of infrainguinal bypass following failed angioplasty was comparable to outcome of surgery performed for another indication. This paper supports the use of distal bypass surgery for limb salvage in cases where minimal access techniques have failed.  相似文献   
995.
996.
P Hildebrand  U J Roblick  R Keller  M Kleemann  L Mirow  H-P Bruch 《Der Chirurg》2007,78(6):494, 496-494, 500
Minimizing the access trauma of surgical interventions is becoming an essential task in modern surgery in order to make the treatment more comfortable for the patient. Minimally invasive surgery has had a major impact on the improvement of surgical results over the last decade. This is why such surgery is often named as the third patient friendly revolution in surgery after the introduction of asepsis and anesthesia. Operations that caused a huge strain on the patients in the past and led to immense costs for society because of the patient's lost working time and extensive rehabilitation, have lost their fear thanks to this technique. The physical strain is lower, the cosmetic effect is considerable and the costs for society might be reduced due to the significantly shorter duration of convalescence.Despite its known advantages, which have been reported in numerous studies, minimally invasive surgery has recently gained increased interest because of the installation of new accounting systems as well as strict budgeting and restricted resources.Realistic cost-benefit analysis and objectified quality controls are needed in order to guarantee innovative and patient friendly basic approaches in medicine in the future.  相似文献   
997.
998.
999.
1000.
Background: Dreaming reported after anesthesia remains a poorly understood phenomenon. Dreaming may be related to light anesthesia and represent near-miss awareness. However, few studies have assessed the relation between dreaming and depth of anesthesia, and their results were inconclusive. Therefore, the authors tested the hypothesis that dreaming during anesthesia is associated with light anesthesia, as evidenced by higher Bispectral Index values during maintenance of anesthesia.

Methods: With approval, 300 consenting healthy patients, aged 18-50 yr, presenting for elective surgery requiring relaxant general anesthesia with a broad range of agents were studied. Patients were interviewed on emergence and 2-4 h postoperatively. The Bispectral Index was recorded from induction until the first interview. Dream content and form were also assessed.

Results: Dreaming was reported by 22% of patients on emergence. There was no difference between dreamers and nondreamers in median Bispectral Index values during maintenance (37 [23-55] vs. 38 [20-59]; P = 0.68) or the time at Bispectral Index values greater than 60 (0 [0-7] vs. 0 [0-31] min; P = 0.38). Dreamers tended to be younger and male, to have high home dream recall, to receive propofol maintenance or regional anesthesia, and to open their eyes sooner after surgery. Most dreams were similar to dreams of sleep and were pleasant, and the content was unrelated to surgery.  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