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   2655311篇
  免费   212823篇
  国内免费   8404篇
耳鼻咽喉   36134篇
儿科学   87126篇
妇产科学   73468篇
基础医学   365025篇
口腔科学   73919篇
临床医学   255692篇
内科学   533015篇
皮肤病学   65187篇
神经病学   222623篇
特种医学   102657篇
外国民族医学   736篇
外科学   400069篇
综合类   50456篇
现状与发展   44篇
一般理论   968篇
预防医学   206263篇
眼科学   58381篇
药学   188560篇
  8篇
中国医学   5335篇
肿瘤学   150872篇
  2021年   21877篇
  2019年   21961篇
  2018年   34583篇
  2017年   28369篇
  2016年   32407篇
  2015年   35683篇
  2014年   48642篇
  2013年   70059篇
  2012年   82924篇
  2011年   87022篇
  2010年   56328篇
  2009年   56339篇
  2008年   81547篇
  2007年   85536篇
  2006年   88244篇
  2005年   83222篇
  2004年   79776篇
  2003年   76834篇
  2002年   74065篇
  2001年   129892篇
  2000年   132250篇
  1999年   111879篇
  1998年   32916篇
  1997年   29430篇
  1996年   29770篇
  1995年   28710篇
  1994年   25915篇
  1993年   24141篇
  1992年   85751篇
  1991年   82066篇
  1990年   79190篇
  1989年   76460篇
  1988年   69871篇
  1987年   68288篇
  1986年   63816篇
  1985年   60724篇
  1984年   45139篇
  1983年   38176篇
  1982年   22631篇
  1981年   20130篇
  1979年   39007篇
  1978年   27542篇
  1977年   23342篇
  1976年   21568篇
  1975年   22864篇
  1974年   26848篇
  1973年   25418篇
  1972年   23806篇
  1971年   21995篇
  1970年   20244篇
排序方式: 共有10000条查询结果,搜索用时 15 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