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   2610234篇
  免费   191291篇
  国内免费   7585篇
耳鼻咽喉   34552篇
儿科学   85884篇
妇产科学   72148篇
基础医学   368127篇
口腔科学   70403篇
临床医学   237319篇
内科学   520365篇
皮肤病学   63096篇
神经病学   216329篇
特种医学   100859篇
外国民族医学   736篇
外科学   390070篇
综合类   50515篇
现状与发展   5篇
一般理论   987篇
预防医学   198334篇
眼科学   57039篇
药学   190060篇
  8篇
中国医学   5383篇
肿瘤学   146891篇
  2021年   20543篇
  2019年   21255篇
  2018年   30121篇
  2017年   23357篇
  2016年   27041篇
  2015年   30191篇
  2014年   41320篇
  2013年   61933篇
  2012年   82100篇
  2011年   86542篇
  2010年   51993篇
  2009年   49923篇
  2008年   80807篇
  2007年   85554篇
  2006年   87134篇
  2005年   83201篇
  2004年   80149篇
  2003年   77345篇
  2002年   74622篇
  2001年   129014篇
  2000年   132028篇
  1999年   111004篇
  1998年   31587篇
  1997年   28174篇
  1996年   28424篇
  1995年   27609篇
  1994年   25265篇
  1993年   23608篇
  1992年   85372篇
  1991年   81769篇
  1990年   78989篇
  1989年   76267篇
  1988年   69658篇
  1987年   68164篇
  1986年   63721篇
  1985年   60721篇
  1984年   45117篇
  1983年   38119篇
  1982年   22603篇
  1981年   20142篇
  1979年   39097篇
  1978年   27548篇
  1977年   23345篇
  1976年   21578篇
  1975年   22897篇
  1974年   26847篇
  1973年   25433篇
  1972年   23801篇
  1971年   21998篇
  1970年   20236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