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   1604552篇
  免费   131479篇
  国内免费   2587篇
耳鼻咽喉   21693篇
儿科学   53002篇
妇产科学   46272篇
基础医学   228206篇
口腔科学   47242篇
临床医学   141187篇
内科学   315170篇
皮肤病学   34119篇
神经病学   130424篇
特种医学   64819篇
外国民族医学   474篇
外科学   244161篇
综合类   39762篇
现状与发展   3篇
一般理论   547篇
预防医学   123140篇
眼科学   36479篇
药学   121490篇
  3篇
中国医学   2977篇
肿瘤学   87448篇
  2018年   14799篇
  2016年   12937篇
  2015年   15064篇
  2014年   20711篇
  2013年   31501篇
  2012年   42668篇
  2011年   44891篇
  2010年   26406篇
  2009年   25370篇
  2008年   43093篇
  2007年   45364篇
  2006年   46186篇
  2005年   44794篇
  2004年   44210篇
  2003年   42290篇
  2002年   41430篇
  2001年   75721篇
  2000年   78377篇
  1999年   66422篇
  1998年   17777篇
  1997年   16370篇
  1996年   16354篇
  1995年   16049篇
  1994年   15098篇
  1993年   14249篇
  1992年   55464篇
  1991年   53811篇
  1990年   52595篇
  1989年   50867篇
  1988年   47266篇
  1987年   46585篇
  1986年   44314篇
  1985年   42869篇
  1984年   32058篇
  1983年   27589篇
  1982年   16174篇
  1981年   14468篇
  1980年   13595篇
  1979年   30487篇
  1978年   21096篇
  1977年   17796篇
  1976年   16718篇
  1975年   17604篇
  1974年   21505篇
  1973年   20692篇
  1972年   18867篇
  1971年   17793篇
  1970年   16310篇
  1969年   15281篇
  1968年   13968篇
排序方式: 共有10000条查询结果,搜索用时 9 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