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   10006篇
  免费   628篇
  国内免费   40篇
耳鼻咽喉   83篇
儿科学   359篇
妇产科学   417篇
基础医学   1463篇
口腔科学   189篇
临床医学   950篇
内科学   1982篇
皮肤病学   290篇
神经病学   1070篇
特种医学   226篇
外国民族医学   1篇
外科学   890篇
综合类   83篇
一般理论   5篇
预防医学   767篇
眼科学   262篇
药学   870篇
中国医学   13篇
肿瘤学   754篇
  2023年   62篇
  2022年   186篇
  2021年   374篇
  2020年   219篇
  2019年   246篇
  2018年   328篇
  2017年   220篇
  2016年   299篇
  2015年   300篇
  2014年   362篇
  2013年   521篇
  2012年   788篇
  2011年   756篇
  2010年   419篇
  2009年   337篇
  2008年   561篇
  2007年   591篇
  2006年   582篇
  2005年   542篇
  2004年   555篇
  2003年   467篇
  2002年   439篇
  2001年   101篇
  2000年   117篇
  1999年   98篇
  1998年   74篇
  1997年   73篇
  1996年   56篇
  1995年   37篇
  1994年   39篇
  1993年   50篇
  1992年   36篇
  1991年   65篇
  1990年   41篇
  1989年   71篇
  1988年   42篇
  1987年   51篇
  1986年   45篇
  1985年   52篇
  1984年   34篇
  1983年   28篇
  1982年   31篇
  1980年   17篇
  1979年   41篇
  1978年   24篇
  1977年   25篇
  1975年   24篇
  1974年   19篇
  1973年   21篇
  1969年   17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.
4.
5.
European Journal of Orthopaedic Surgery & Traumatology - The goals of this study were to compare patient satisfaction and wound-related complications in patients receiving 2-octyl cyanoacrylate...  相似文献   
6.
7.
8.
9.
10.
C31G, which has potent activity against the human immunodeficiency virus type 1 (HIV-1) and an established record of safety in animal studies and human trials, is a microbicidal agent comprised of a buffered equimolar mixture of two amphoteric, surface-active agents: an alkyl amine oxide (C14AO) and an alkyl betaine (C16B). Studies of long-term in vitro exposure to C31G and its constituents have suggested that the components of C31G may contribute differentially to its toxicity and efficacy. In the present studies, in vitro assays of cytotoxicity and anti-HIV-1 activity demonstrated that C16B was slightly less cytotoxic compared to either C31G or C14AO, whereas the anti-HIV-1 activities of C31G and its individual constituents were similar. In the murine model of cervicovaginal microbicide toxicity, in vivo exposure to C14AO resulted in severe cervical inflammation followed by a delayed disruption of the columnar epithelium. In contrast, exposure to C16B caused severe cervical epithelial disruption and a secondary, less intense inflammatory response. These results demonstrate that (i) there are both mechanistic and temporal differences in toxicity associated with the components of C31G not necessarily predicted by in vitro assessments of cytotoxicity and (ii) contributions of each component to the anti-HIV-1 activity of C31G appear to be equal. In addition, these findings indicate that direct and indirect mechanisms of in vivo toxicity can be observed as separate but interrelated events. These results provide further insight into the activity of C31G, as well as mechanisms potentially associated with microbicide toxicity.  相似文献   
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