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   2725563篇
  免费   192417篇
  国内免费   4987篇
耳鼻咽喉   35534篇
儿科学   89830篇
妇产科学   74108篇
基础医学   390396篇
口腔科学   76996篇
临床医学   247272篇
内科学   529665篇
皮肤病学   59704篇
神经病学   216105篇
特种医学   102187篇
外国民族医学   496篇
外科学   402975篇
综合类   60482篇
现状与发展   6篇
一般理论   1042篇
预防医学   215082篇
眼科学   63108篇
药学   197955篇
  12篇
中国医学   5876篇
肿瘤学   154136篇
  2019年   20923篇
  2018年   37705篇
  2017年   29032篇
  2016年   32650篇
  2015年   28521篇
  2014年   39519篇
  2013年   58758篇
  2012年   82948篇
  2011年   92770篇
  2010年   56099篇
  2009年   51759篇
  2008年   87529篇
  2007年   94299篇
  2006年   85550篇
  2005年   83656篇
  2004年   81175篇
  2003年   78545篇
  2002年   75086篇
  2001年   128601篇
  2000年   131714篇
  1999年   109709篇
  1998年   30007篇
  1997年   26665篇
  1996年   26855篇
  1995年   25591篇
  1994年   23671篇
  1993年   21992篇
  1992年   84480篇
  1991年   82272篇
  1990年   79343篇
  1989年   76685篇
  1988年   70316篇
  1987年   68872篇
  1986年   65191篇
  1985年   61667篇
  1984年   46076篇
  1983年   39700篇
  1982年   22945篇
  1979年   42199篇
  1978年   29932篇
  1977年   25284篇
  1976年   23601篇
  1975年   25028篇
  1974年   30455篇
  1973年   29694篇
  1972年   27721篇
  1971年   25781篇
  1970年   24238篇
  1969年   22768篇
  1968年   21214篇
排序方式: 共有10000条查询结果,搜索用时 0 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.
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   
6.
7.
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