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   2437522篇
  免费   181640篇
  国内免费   3748篇
耳鼻咽喉   33977篇
儿科学   79401篇
妇产科学   68485篇
基础医学   345692篇
口腔科学   71567篇
临床医学   216055篇
内科学   468049篇
皮肤病学   53250篇
神经病学   192420篇
特种医学   97456篇
外国民族医学   665篇
外科学   370408篇
综合类   56655篇
现状与发展   4篇
一般理论   772篇
预防医学   182474篇
眼科学   56273篇
药学   188107篇
  10篇
中国医学   5175篇
肿瘤学   136015篇
  2018年   23518篇
  2016年   20783篇
  2015年   23701篇
  2014年   32593篇
  2013年   48993篇
  2012年   66506篇
  2011年   70214篇
  2010年   41519篇
  2009年   39389篇
  2008年   66678篇
  2007年   70487篇
  2006年   71819篇
  2005年   69187篇
  2004年   67627篇
  2003年   64763篇
  2002年   63141篇
  2001年   119725篇
  2000年   123516篇
  1999年   104060篇
  1998年   27603篇
  1997年   24702篇
  1996年   24592篇
  1995年   23706篇
  1994年   21993篇
  1993年   20771篇
  1992年   83168篇
  1991年   80496篇
  1990年   79042篇
  1989年   76400篇
  1988年   70395篇
  1987年   69179篇
  1986年   65637篇
  1985年   62937篇
  1984年   46479篇
  1983年   39843篇
  1982年   22868篇
  1981年   20228篇
  1980年   19054篇
  1979年   43557篇
  1978年   29935篇
  1977年   25793篇
  1976年   23630篇
  1975年   25589篇
  1974年   30783篇
  1973年   29673篇
  1972年   27694篇
  1971年   26090篇
  1970年   23936篇
  1969年   22708篇
  1968年   20607篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
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   
5.
6.

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   
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