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   3161366篇
  免费   216314篇
  国内免费   8729篇
耳鼻咽喉   42627篇
儿科学   105077篇
妇产科学   87138篇
基础医学   449300篇
口腔科学   87950篇
临床医学   285924篇
内科学   617538篇
皮肤病学   75543篇
神经病学   252199篇
特种医学   122469篇
外国民族医学   881篇
外科学   470572篇
综合类   61853篇
现状与发展   6篇
一般理论   1103篇
预防医学   242442篇
眼科学   71049篇
药学   231361篇
  11篇
中国医学   7103篇
肿瘤学   174263篇
  2021年   23941篇
  2019年   24423篇
  2018年   37369篇
  2017年   29609篇
  2016年   32960篇
  2015年   38041篇
  2014年   50073篇
  2013年   72802篇
  2012年   100772篇
  2011年   102366篇
  2010年   60917篇
  2009年   59283篇
  2008年   93505篇
  2007年   99830篇
  2006年   101473篇
  2005年   103704篇
  2004年   101703篇
  2003年   94656篇
  2002年   87667篇
  2001年   148977篇
  2000年   151309篇
  1999年   129030篇
  1998年   36292篇
  1997年   31961篇
  1996年   32270篇
  1995年   31244篇
  1994年   28679篇
  1993年   26762篇
  1992年   101450篇
  1991年   98514篇
  1990年   95699篇
  1989年   92933篇
  1988年   85065篇
  1987年   83279篇
  1986年   78201篇
  1985年   74162篇
  1984年   55041篇
  1983年   46604篇
  1982年   26909篇
  1979年   49090篇
  1978年   34398篇
  1977年   29163篇
  1976年   27033篇
  1975年   29447篇
  1974年   34902篇
  1973年   33056篇
  1972年   31149篇
  1971年   29000篇
  1970年   27048篇
  1969年   25770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.
8.
9.
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   
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