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   2606989篇
  免费   190636篇
  国内免费   7685篇
耳鼻咽喉   34561篇
儿科学   85760篇
妇产科学   72200篇
基础医学   366945篇
口腔科学   71212篇
临床医学   236543篇
内科学   520782篇
皮肤病学   63204篇
神经病学   215532篇
特种医学   100296篇
外国民族医学   736篇
外科学   388382篇
综合类   50493篇
现状与发展   5篇
一般理论   985篇
预防医学   198912篇
眼科学   57068篇
药学   189741篇
  8篇
中国医学   5479篇
肿瘤学   146466篇
  2021年   21164篇
  2019年   21614篇
  2018年   30480篇
  2017年   23345篇
  2016年   26946篇
  2015年   30380篇
  2014年   41623篇
  2013年   61843篇
  2012年   82356篇
  2011年   86804篇
  2010年   52160篇
  2009年   50108篇
  2008年   80586篇
  2007年   85312篇
  2006年   86860篇
  2005年   82864篇
  2004年   79700篇
  2003年   76857篇
  2002年   74041篇
  2001年   128488篇
  2000年   131380篇
  1999年   110555篇
  1998年   31348篇
  1997年   28004篇
  1996年   28276篇
  1995年   27432篇
  1994年   25117篇
  1993年   23455篇
  1992年   85192篇
  1991年   81578篇
  1990年   78806篇
  1989年   76075篇
  1988年   69484篇
  1987年   68007篇
  1986年   63557篇
  1985年   60523篇
  1984年   44954篇
  1983年   37956篇
  1982年   22466篇
  1981年   19989篇
  1979年   38969篇
  1978年   27443篇
  1977年   23253篇
  1976年   21499篇
  1975年   22816篇
  1974年   26787篇
  1973年   25374篇
  1972年   23752篇
  1971年   21956篇
  1970年   20183篇
排序方式: 共有10000条查询结果,搜索用时 15 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