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   2442290篇
  免费   181883篇
  国内免费   3767篇
耳鼻咽喉   34052篇
儿科学   79658篇
妇产科学   68552篇
基础医学   346201篇
口腔科学   71710篇
临床医学   216407篇
内科学   469082篇
皮肤病学   53349篇
神经病学   192701篇
特种医学   97613篇
外国民族医学   666篇
外科学   371179篇
综合类   56821篇
现状与发展   4篇
一般理论   776篇
预防医学   182749篇
眼科学   56405篇
药学   188500篇
  10篇
中国医学   5202篇
肿瘤学   136303篇
  2018年   23682篇
  2016年   20904篇
  2015年   23844篇
  2014年   32797篇
  2013年   49271篇
  2012年   66850篇
  2011年   70602篇
  2010年   41748篇
  2009年   39566篇
  2008年   66936篇
  2007年   70736篇
  2006年   72044篇
  2005年   69404篇
  2004年   67832篇
  2003年   64914篇
  2002年   63288篇
  2001年   119783篇
  2000年   123598篇
  1999年   104139篇
  1998年   27646篇
  1997年   24724篇
  1996年   24618篇
  1995年   23735篇
  1994年   22013篇
  1993年   20780篇
  1992年   83212篇
  1991年   80530篇
  1990年   79061篇
  1989年   76417篇
  1988年   70418篇
  1987年   69201篇
  1986年   65652篇
  1985年   62969篇
  1984年   46496篇
  1983年   39872篇
  1982年   22883篇
  1981年   20243篇
  1980年   19065篇
  1979年   43571篇
  1978年   29947篇
  1977年   25799篇
  1976年   23640篇
  1975年   25598篇
  1974年   30797篇
  1973年   29691篇
  1972年   27704篇
  1971年   26099篇
  1970年   23940篇
  1969年   22722篇
  1968年   20622篇
排序方式: 共有10000条查询结果,搜索用时 0 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