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   2590862篇
  免费   190130篇
  国内免费   7597篇
耳鼻咽喉   34403篇
儿科学   85516篇
妇产科学   71759篇
基础医学   364701篇
口腔科学   69918篇
临床医学   234941篇
内科学   516924篇
皮肤病学   62800篇
神经病学   213909篇
特种医学   100223篇
外国民族医学   742篇
外科学   388029篇
综合类   50439篇
现状与发展   5篇
一般理论   970篇
预防医学   196638篇
眼科学   56837篇
药学   188651篇
  8篇
中国医学   5372篇
肿瘤学   145804篇
  2021年   20387篇
  2019年   21047篇
  2018年   29811篇
  2017年   22968篇
  2016年   26623篇
  2015年   29851篇
  2014年   40952篇
  2013年   61088篇
  2012年   81018篇
  2011年   85346篇
  2010年   51541篇
  2009年   49633篇
  2008年   79578篇
  2007年   84388篇
  2006年   86055篇
  2005年   82123篇
  2004年   79071篇
  2003年   76275篇
  2002年   73560篇
  2001年   128523篇
  2000年   131436篇
  1999年   110571篇
  1998年   31306篇
  1997年   27954篇
  1996年   28257篇
  1995年   27406篇
  1994年   25094篇
  1993年   23434篇
  1992年   85173篇
  1991年   81580篇
  1990年   78793篇
  1989年   76067篇
  1988年   69484篇
  1987年   68006篇
  1986年   63545篇
  1985年   60525篇
  1984年   44967篇
  1983年   37980篇
  1982年   22480篇
  1981年   19997篇
  1979年   38973篇
  1978年   27459篇
  1977年   23266篇
  1976年   21513篇
  1975年   22829篇
  1974年   26790篇
  1973年   25376篇
  1972年   23753篇
  1971年   21957篇
  1970年   20185篇
排序方式: 共有10000条查询结果,搜索用时 46 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