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   3208783篇
  免费   228830篇
  国内免费   8651篇
耳鼻咽喉   43194篇
儿科学   107143篇
妇产科学   88590篇
基础医学   453445篇
口腔科学   89166篇
临床医学   293082篇
内科学   627264篇
皮肤病学   75531篇
神经病学   261942篇
特种医学   123234篇
外国民族医学   1009篇
外科学   477839篇
综合类   67417篇
现状与发展   5篇
一般理论   1263篇
预防医学   248238篇
眼科学   72216篇
药学   234054篇
  11篇
中国医学   6560篇
肿瘤学   175061篇
  2019年   24980篇
  2018年   35391篇
  2017年   27220篇
  2016年   31322篇
  2015年   35292篇
  2014年   48567篇
  2013年   73682篇
  2012年   97589篇
  2011年   103343篇
  2010年   62175篇
  2009年   59347篇
  2008年   96650篇
  2007年   102494篇
  2006年   104466篇
  2005年   100093篇
  2004年   96810篇
  2003年   93488篇
  2002年   90124篇
  2001年   152881篇
  2000年   156668篇
  1999年   132161篇
  1998年   37999篇
  1997年   33880篇
  1996年   33954篇
  1995年   32896篇
  1994年   30317篇
  1993年   28259篇
  1992年   103547篇
  1991年   100041篇
  1990年   97244篇
  1989年   93921篇
  1988年   85850篇
  1987年   84661篇
  1986年   79264篇
  1985年   75927篇
  1984年   56616篇
  1983年   47984篇
  1982年   28545篇
  1981年   25570篇
  1979年   50448篇
  1978年   35865篇
  1977年   30396篇
  1976年   28340篇
  1975年   30065篇
  1974年   35806篇
  1973年   34118篇
  1972年   31760篇
  1971年   29570篇
  1970年   27245篇
  1969年   25989篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
1.
2.
3.
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.
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   
6.
7.
8.
9.
10.
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   
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