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   2579199篇
  免费   189342篇
  国内免费   7554篇
耳鼻咽喉   34263篇
儿科学   85216篇
妇产科学   71566篇
基础医学   363442篇
口腔科学   69643篇
临床医学   233936篇
内科学   514035篇
皮肤病学   62448篇
神经病学   213299篇
特种医学   99860篇
外国民族医学   736篇
外科学   385961篇
综合类   50325篇
现状与发展   5篇
一般理论   968篇
预防医学   195620篇
眼科学   56551篇
药学   187895篇
  8篇
中国医学   5331篇
肿瘤学   144987篇
  2021年   19957篇
  2019年   20617篇
  2018年   29284篇
  2017年   22595篇
  2016年   26230篇
  2015年   29509篇
  2014年   40451篇
  2013年   60449篇
  2012年   80238篇
  2011年   84507篇
  2010年   51013篇
  2009年   49157篇
  2008年   79038篇
  2007年   83857篇
  2006年   85590篇
  2005年   81754篇
  2004年   78736篇
  2003年   76050篇
  2002年   73355篇
  2001年   128417篇
  2000年   131338篇
  1999年   110514篇
  1998年   31260篇
  1997年   27932篇
  1996年   28220篇
  1995年   27390篇
  1994年   25076篇
  1993年   23423篇
  1992年   85171篇
  1991年   81574篇
  1990年   78801篇
  1989年   76067篇
  1988年   69482篇
  1987年   68019篇
  1986年   63560篇
  1985年   60523篇
  1984年   44948篇
  1983年   37954篇
  1982年   22449篇
  1981年   19909篇
  1979年   38893篇
  1978年   27376篇
  1977年   23173篇
  1976年   21430篇
  1975年   22770篇
  1974年   26752篇
  1973年   25339篇
  1972年   23748篇
  1971年   21953篇
  1970年   20168篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.

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   
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