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   2685816篇
  免费   215422篇
  国内免费   8434篇
耳鼻咽喉   36532篇
儿科学   87946篇
妇产科学   74180篇
基础医学   368958篇
口腔科学   74937篇
临床医学   259962篇
内科学   538414篇
皮肤病学   65509篇
神经病学   225183篇
特种医学   103487篇
外国民族医学   738篇
外科学   403688篇
综合类   51196篇
现状与发展   44篇
一般理论   998篇
预防医学   210128篇
眼科学   59055篇
药学   190901篇
  9篇
中国医学   5357篇
肿瘤学   152450篇
  2021年   22323篇
  2019年   22459篇
  2018年   35090篇
  2017年   28757篇
  2016年   32791篇
  2015年   36129篇
  2014年   49329篇
  2013年   71166篇
  2012年   84552篇
  2011年   88778篇
  2010年   57268篇
  2009年   57215篇
  2008年   83091篇
  2007年   87194篇
  2006年   89770篇
  2005年   84885篇
  2004年   81340篇
  2003年   78328篇
  2002年   75498篇
  2001年   130459篇
  2000年   132843篇
  1999年   112486篇
  1998年   33252篇
  1997年   29675篇
  1996年   30038篇
  1995年   28946篇
  1994年   26160篇
  1993年   24387篇
  1992年   86206篇
  1991年   82541篇
  1990年   79716篇
  1989年   76903篇
  1988年   70300篇
  1987年   68736篇
  1986年   64240篇
  1985年   61175篇
  1984年   45497篇
  1983年   38504篇
  1982年   22852篇
  1981年   20371篇
  1979年   39318篇
  1978年   27791篇
  1977年   23552篇
  1976年   21764篇
  1975年   23046篇
  1974年   27104篇
  1973年   25664篇
  1972年   24019篇
  1971年   22214篇
  1970年   20431篇
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
71.
72.
73.
74.
75.
76.

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   
77.
78.
79.

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   
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