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   1903778篇
  免费   148388篇
  国内免费   7196篇
耳鼻咽喉   24354篇
儿科学   61914篇
妇产科学   50778篇
基础医学   271938篇
口腔科学   53018篇
临床医学   171939篇
内科学   381824篇
皮肤病学   44852篇
神经病学   149410篇
特种医学   75775篇
外国民族医学   346篇
外科学   293292篇
综合类   43654篇
现状与发展   4篇
一般理论   555篇
预防医学   148677篇
眼科学   41845篇
药学   137371篇
  8篇
中国医学   4277篇
肿瘤学   103531篇
  2018年   19546篇
  2016年   18000篇
  2015年   20044篇
  2014年   27819篇
  2013年   41888篇
  2012年   52467篇
  2011年   55991篇
  2010年   34442篇
  2009年   33302篇
  2008年   52319篇
  2007年   55916篇
  2006年   57146篇
  2005年   54708篇
  2004年   52790篇
  2003年   50884篇
  2002年   48724篇
  2001年   93620篇
  2000年   95927篇
  1999年   79826篇
  1998年   22886篇
  1997年   20179篇
  1996年   21167篇
  1995年   21076篇
  1994年   19644篇
  1993年   18284篇
  1992年   65010篇
  1991年   63682篇
  1990年   61561篇
  1989年   59349篇
  1988年   54725篇
  1987年   53593篇
  1986年   50633篇
  1985年   48447篇
  1984年   36500篇
  1983年   30763篇
  1982年   18525篇
  1981年   16649篇
  1980年   15748篇
  1979年   32978篇
  1978年   23701篇
  1977年   20015篇
  1976年   18648篇
  1975年   19810篇
  1974年   23265篇
  1973年   22240篇
  1972年   20674篇
  1971年   19114篇
  1970年   17752篇
  1969年   16538篇
  1968年   15351篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.

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   
3.
We report two British cases of liver abscess, due to Klebsiella pneumoniae and associated with synchronous infection elsewhere, which required liver resection for definitive treatment. They illustrate the geographic spread of aggressive K pneumoniae liver infection and demonstrate the importance of early aggressive treatment.  相似文献   
4.
5.
6.
7.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
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