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   2720855篇
  免费   191976篇
  国内免费   7925篇
耳鼻咽喉   36264篇
儿科学   90578篇
妇产科学   75835篇
基础医学   381605篇
口腔科学   73878篇
临床医学   245336篇
内科学   538781篇
皮肤病学   65785篇
神经病学   221735篇
特种医学   107460篇
外国民族医学   823篇
外科学   407653篇
综合类   51271篇
现状与发展   5篇
一般理论   969篇
预防医学   207852篇
眼科学   59909篇
药学   197595篇
  10篇
中国医学   5427篇
肿瘤学   151985篇
  2019年   20716篇
  2018年   32247篇
  2017年   25868篇
  2016年   28866篇
  2015年   33484篇
  2014年   43853篇
  2013年   63105篇
  2012年   87847篇
  2011年   88093篇
  2010年   52743篇
  2009年   52082篇
  2008年   80601篇
  2007年   85950篇
  2006年   87847篇
  2005年   90849篇
  2004年   89203篇
  2003年   82762篇
  2002年   75955篇
  2001年   130558篇
  2000年   132237篇
  1999年   113433篇
  1998年   31612篇
  1997年   28112篇
  1996年   28441篇
  1995年   27634篇
  1994年   25285篇
  1993年   23575篇
  1992年   88957篇
  1991年   85770篇
  1990年   83173篇
  1989年   80341篇
  1988年   73515篇
  1987年   71992篇
  1986年   67409篇
  1985年   63880篇
  1984年   47287篇
  1983年   39936篇
  1982年   23131篇
  1981年   20520篇
  1979年   41637篇
  1978年   29065篇
  1977年   24532篇
  1976年   22576篇
  1975年   24569篇
  1974年   29058篇
  1973年   27410篇
  1972年   25795篇
  1971年   23991篇
  1970年   22090篇
  1969年   21295篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
61.
62.
63.

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   
64.
65.
66.
67.

Introduction

Several studies demonstrated that simulator-acquired skill transfer to the operating room is incomplete. Our objective was to identify trainee characteristics that predict the transfer of simulator-acquired skill to the operating room.

Methods

Trainees completed baseline assessments including intracorporeal suturing (IS) performance, attentional selectivity, self-reported use of mental skills, and self-reported prior clinical and simulated laparoscopic experience and confidence. Residents then followed proficiency-based laparoscopic skills training, and their skill transfer was assessed on a live-anesthetized porcine model. Predictive characteristics for transfer test performance were assessed using multiple linear regression.

Results

Thirty-eight residents completed the study. Automaticity, attentional selectivity, resident perceived ability with laparoscopy and simulators, and post-training IS performance were predictive of IS performance during the transfer test.

Conclusions

Promoting automaticity, self-efficacy, and attention selectivity may help improve the transfer of simulator-acquired skill. Mental skills training and training to automaticity may therefore be valuable interventions to achieve this goal.  相似文献   
68.
69.
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