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   1603485篇
  免费   131327篇
  国内免费   2586篇
耳鼻咽喉   21672篇
儿科学   52989篇
妇产科学   46240篇
基础医学   227902篇
口腔科学   47245篇
临床医学   141038篇
内科学   315354篇
皮肤病学   34104篇
神经病学   130195篇
特种医学   64765篇
外国民族医学   474篇
外科学   243938篇
综合类   39750篇
现状与发展   3篇
一般理论   545篇
预防医学   122915篇
眼科学   36516篇
药学   121387篇
  3篇
中国医学   2979篇
肿瘤学   87384篇
  2018年   14845篇
  2016年   12960篇
  2015年   15077篇
  2014年   20720篇
  2013年   31418篇
  2012年   42651篇
  2011年   44862篇
  2010年   26395篇
  2009年   25359篇
  2008年   43086篇
  2007年   45314篇
  2006年   46129篇
  2005年   44731篇
  2004年   44148篇
  2003年   42224篇
  2002年   41322篇
  2001年   75703篇
  2000年   78341篇
  1999年   66399篇
  1998年   17742篇
  1997年   16340篇
  1996年   16317篇
  1995年   16022篇
  1994年   15076篇
  1993年   14222篇
  1992年   55434篇
  1991年   53786篇
  1990年   52577篇
  1989年   50844篇
  1988年   47231篇
  1987年   46564篇
  1986年   44291篇
  1985年   42848篇
  1984年   32043篇
  1983年   27572篇
  1982年   16147篇
  1981年   14448篇
  1980年   13570篇
  1979年   30466篇
  1978年   21066篇
  1977年   17764篇
  1976年   16694篇
  1975年   17576篇
  1974年   21490篇
  1973年   20680篇
  1972年   18858篇
  1971年   17774篇
  1970年   16292篇
  1969年   15277篇
  1968年   13950篇
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
1.
2.
3.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
4.

Objectives

Expedient extubation after cardiac surgery has been associated with improved outcomes, leading to postoperative extubation frequently during overnight hours. However, recent evidence in a mixed medical-surgical intensive care unit population demonstrated worse outcomes with overnight extubation. This study investigated the impact of overnight extubation in a statewide, multicenter Society of Thoracic Surgeons database.

Methods

Records from 39,812 patients undergoing coronary artery bypass grafting or valve operations (2008-2016) and extubated within 24 hours were stratified according to extubation time between 06:00 and 18:00 (day) or between 18:00 and 6:00 (overnight). Outcomes including reintubation, mortality, and composite morbidity-mortality were evaluated using hierarchical regression models adjusted for Society of Thoracic Surgeons predictive risk scores. To further analyze extubation during the night, a subanalysis stratified patients into 3 groups: 06:00 to 18:00, 18:00 to 24:00, and 24:00 to 06:00.

Results

A total of 20,758 patients were extubated overnight (52.1%) and were slightly older (median age 66 vs 65 years, P < .001) with a longer duration of ventilation (4 vs 7 hours, P < .001). Day and overnight extubation were associated with equivalent operative mortality (1.7% vs 1.7%, P = .880), reintubation (3.7% vs 3.4%, P = .141), and composite morbidity-mortality (8.2% vs 8.0%, P = .314). After risk adjustment, overnight extubation was not associated with any difference in reintubation, mortality, or composite morbidity-mortality. On subanalysis, those extubated between 24:00 and 06:00 exhibited increased composite morbidity-mortality (odds ratio, 1.18; P = .001) but no difference in reintubation or mortality.

Conclusions

Extubation overnight was not associated with increased mortality or reintubation. These results suggest that in the appropriate clinical setting, it is safe to routinely extubate cardiac surgery patients overnight.  相似文献   
5.
6.
7.
8.
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