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   2609409篇
  免费   190646篇
  国内免费   7608篇
耳鼻咽喉   34667篇
儿科学   86187篇
妇产科学   72109篇
基础医学   366979篇
口腔科学   70531篇
临床医学   236292篇
内科学   521920篇
皮肤病学   63292篇
神经病学   215645篇
特种医学   100385篇
外国民族医学   736篇
外科学   389866篇
综合类   50554篇
现状与发展   5篇
一般理论   979篇
预防医学   198616篇
眼科学   57415篇
药学   189467篇
  8篇
中国医学   5461篇
肿瘤学   146549篇
  2021年   20776篇
  2019年   21528篇
  2018年   30613篇
  2017年   23372篇
  2016年   26856篇
  2015年   30029篇
  2014年   41097篇
  2013年   61584篇
  2012年   82326篇
  2011年   86912篇
  2010年   52140篇
  2009年   49857篇
  2008年   80816篇
  2007年   85720篇
  2006年   87223篇
  2005年   83348篇
  2004年   80208篇
  2003年   77469篇
  2002年   74569篇
  2001年   128930篇
  2000年   132012篇
  1999年   110870篇
  1998年   31367篇
  1997年   27992篇
  1996年   28286篇
  1995年   27440篇
  1994年   25117篇
  1993年   23472篇
  1992年   85222篇
  1991年   81615篇
  1990年   78817篇
  1989年   76098篇
  1988年   69502篇
  1987年   68023篇
  1986年   63571篇
  1985年   60545篇
  1984年   44972篇
  1983年   37972篇
  1982年   22477篇
  1981年   20003篇
  1979年   38971篇
  1978年   27466篇
  1977年   23269篇
  1976年   21509篇
  1975年   22832篇
  1974年   26798篇
  1973年   25378篇
  1972年   23757篇
  1971年   21965篇
  1970年   20184篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
64.
65.

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   
66.
67.
68.

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   
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