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   2883377篇
  免费   217541篇
  国内免费   5444篇
耳鼻咽喉   38834篇
儿科学   95057篇
妇产科学   79959篇
基础医学   409148篇
口腔科学   85620篇
临床医学   258668篇
内科学   557201篇
皮肤病学   63661篇
神经病学   228447篇
特种医学   111928篇
外国民族医学   698篇
外科学   436920篇
综合类   70041篇
现状与发展   6篇
一般理论   1010篇
预防医学   220030篇
眼科学   68221篇
药学   214695篇
  9篇
中国医学   6363篇
肿瘤学   159846篇
  2018年   30238篇
  2017年   23292篇
  2016年   25697篇
  2015年   29431篇
  2014年   40860篇
  2013年   60998篇
  2012年   83649篇
  2011年   88186篇
  2010年   52255篇
  2009年   49145篇
  2008年   82979篇
  2007年   87949篇
  2006年   88850篇
  2005年   85609篇
  2004年   83542篇
  2003年   79779篇
  2002年   77417篇
  2001年   140785篇
  2000年   144838篇
  1999年   121239篇
  1998年   32798篇
  1997年   29208篇
  1996年   29154篇
  1995年   28149篇
  1994年   26201篇
  1993年   24377篇
  1992年   96072篇
  1991年   93325篇
  1990年   90487篇
  1989年   87283篇
  1988年   80416篇
  1987年   78835篇
  1986年   74913篇
  1985年   71889篇
  1984年   53277篇
  1983年   45755篇
  1982年   26355篇
  1981年   23577篇
  1979年   49374篇
  1978年   34044篇
  1977年   28940篇
  1976年   27160篇
  1975年   28756篇
  1974年   35077篇
  1973年   33715篇
  1972年   31139篇
  1971年   29217篇
  1970年   27014篇
  1969年   25304篇
  1968年   23304篇
排序方式: 共有10000条查询结果,搜索用时 8 毫秒
1.

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   
2.
3.
4.
5.
6.
Dosage form is a mean used for the delivery of drug to a living body. In order to get the desired effect the drug should be delivered to its site of action at such rate and concentration to achieve the maximum therapeutic effect and minimum adverse effect. Since oral route is still widely accepted route but having a common drawback of difficulty in swallowing of tablets and capsules. Therefore a lot of research has been done on novel drug delivery systems. This review is about oral dispersible tablets a novel approach in drug delivery systems that are now a day''s more focused in formulation world, and laid a new path that, helped the patients to build their compliance level with the therapy, also reduced the cost and ease the administration especially in case of pediatrics and geriatrics. Quick absorption, rapid onset of action and reduction in drug loss properties are the basic advantages of this dosage form.  相似文献   
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