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   2708048篇
  免费   205967篇
  国内免费   8535篇
耳鼻咽喉   35112篇
儿科学   88788篇
妇产科学   73466篇
基础医学   377867篇
口腔科学   76705篇
临床医学   245388篇
内科学   538415篇
皮肤病学   62804篇
神经病学   215626篇
特种医学   105517篇
外国民族医学   513篇
外科学   414994篇
综合类   64189篇
现状与发展   6篇
一般理论   926篇
预防医学   210262篇
眼科学   61867篇
药学   194738篇
  11篇
中国医学   5937篇
肿瘤学   149419篇
  2018年   29645篇
  2017年   22776篇
  2016年   25856篇
  2015年   29283篇
  2014年   40892篇
  2013年   60802篇
  2012年   79823篇
  2011年   84915篇
  2010年   51435篇
  2009年   48781篇
  2008年   78841篇
  2007年   84041篇
  2006年   85319篇
  2005年   81915篇
  2004年   78730篇
  2003年   75576篇
  2002年   72468篇
  2001年   134984篇
  2000年   138601篇
  1999年   115016篇
  1998年   32417篇
  1997年   28552篇
  1996年   29305篇
  1995年   28778篇
  1994年   26657篇
  1993年   24823篇
  1992年   90982篇
  1991年   88242篇
  1990年   85061篇
  1989年   81523篇
  1988年   74899篇
  1987年   73534篇
  1986年   69310篇
  1985年   66282篇
  1984年   49740篇
  1983年   41989篇
  1982年   24931篇
  1981年   22362篇
  1980年   20706篇
  1979年   44285篇
  1978年   31326篇
  1977年   26663篇
  1976年   24719篇
  1975年   25914篇
  1974年   30876篇
  1973年   29689篇
  1972年   27598篇
  1971年   25402篇
  1970年   23431篇
  1969年   21998篇
排序方式: 共有10000条查询结果,搜索用时 0 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.
4.
5.
6.
7.
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   
8.
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   
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