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   3759749篇
  免费   261706篇
  国内免费   9727篇
耳鼻咽喉   50653篇
儿科学   123905篇
妇产科学   102468篇
基础医学   528338篇
口腔科学   105583篇
临床医学   343508篇
内科学   734842篇
皮肤病学   89007篇
神经病学   305896篇
特种医学   141176篇
外国民族医学   1006篇
外科学   558016篇
综合类   78411篇
现状与发展   8篇
一般理论   1434篇
预防医学   290414篇
眼科学   86672篇
药学   273988篇
  12篇
中国医学   8374篇
肿瘤学   207471篇
  2021年   30115篇
  2019年   31192篇
  2018年   45633篇
  2017年   34258篇
  2016年   38564篇
  2015年   43599篇
  2014年   59190篇
  2013年   88801篇
  2012年   122462篇
  2011年   129135篇
  2010年   76049篇
  2009年   71142篇
  2008年   119380篇
  2007年   127198篇
  2006年   128007篇
  2005年   123095篇
  2004年   118161篇
  2003年   113302篇
  2002年   109299篇
  2001年   177755篇
  2000年   181953篇
  1999年   153183篇
  1998年   43418篇
  1997年   38265篇
  1996年   38347篇
  1995年   37156篇
  1994年   33972篇
  1993年   31823篇
  1992年   118362篇
  1991年   114081篇
  1990年   110398篇
  1989年   106608篇
  1988年   97614篇
  1987年   95541篇
  1986年   89687篇
  1985年   85628篇
  1984年   63893篇
  1983年   54222篇
  1982年   31842篇
  1979年   56533篇
  1978年   39712篇
  1977年   33849篇
  1976年   31480篇
  1975年   33387篇
  1974年   39886篇
  1973年   38154篇
  1972年   35618篇
  1971年   33085篇
  1970年   30620篇
  1969年   29288篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.

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   
63.
64.
65.
66.
67.
68.
69.
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   
70.
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