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   3114529篇
  免费   225081篇
  国内免费   8647篇
耳鼻咽喉   42658篇
儿科学   102425篇
妇产科学   87259篇
基础医学   438334篇
口腔科学   85856篇
临床医学   280592篇
内科学   614091篇
皮肤病学   73211篇
神经病学   255148篇
特种医学   121180篇
外国民族医学   1019篇
外科学   470305篇
综合类   63712篇
现状与发展   5篇
一般理论   1165篇
预防医学   237651篇
眼科学   70355篇
药学   227005篇
  8篇
中国医学   6373篇
肿瘤学   169905篇
  2019年   24159篇
  2018年   34063篇
  2017年   26345篇
  2016年   30227篇
  2015年   34020篇
  2014年   47240篇
  2013年   71155篇
  2012年   94546篇
  2011年   100090篇
  2010年   60581篇
  2009年   58008篇
  2008年   93967篇
  2007年   99595篇
  2006年   101478篇
  2005年   97602篇
  2004年   93811篇
  2003年   90743篇
  2002年   87804篇
  2001年   148375篇
  2000年   151868篇
  1999年   128543篇
  1998年   36855篇
  1997年   32895篇
  1996年   33030篇
  1995年   31717篇
  1994年   29261篇
  1993年   27545篇
  1992年   100105篇
  1991年   96202篇
  1990年   93356篇
  1989年   90335篇
  1988年   82841篇
  1987年   81229篇
  1986年   76535篇
  1985年   72908篇
  1984年   54499篇
  1983年   46310篇
  1982年   27607篇
  1981年   24514篇
  1979年   48549篇
  1978年   34318篇
  1977年   29048篇
  1976年   27137篇
  1975年   29007篇
  1974年   34386篇
  1973年   32866篇
  1972年   30841篇
  1971年   28491篇
  1970年   26605篇
  1969年   25483篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
71.
72.
73.
74.
75.

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   
76.
77.
78.

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   
79.
80.
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