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   2586902篇
  免费   189492篇
  国内免费   7572篇
耳鼻咽喉   34330篇
儿科学   85250篇
妇产科学   71662篇
基础医学   364278篇
口腔科学   69727篇
临床医学   234617篇
内科学   516414篇
皮肤病学   62589篇
神经病学   213702篇
特种医学   100008篇
外国民族医学   736篇
外科学   386979篇
综合类   50401篇
现状与发展   5篇
一般理论   968篇
预防医学   196005篇
眼科学   56701篇
药学   188515篇
  8篇
中国医学   5343篇
肿瘤学   145728篇
  2021年   20078篇
  2019年   20684篇
  2018年   29370篇
  2017年   22646篇
  2016年   26297篇
  2015年   29610篇
  2014年   40561篇
  2013年   60585篇
  2012年   80511篇
  2011年   84825篇
  2010年   51185篇
  2009年   49268篇
  2008年   79314篇
  2007年   84177篇
  2006年   85862篇
  2005年   82038篇
  2004年   79075篇
  2003年   76366篇
  2002年   73664篇
  2001年   128547篇
  2000年   131493篇
  1999年   110627篇
  1998年   31322篇
  1997年   27965篇
  1996年   28264篇
  1995年   27427篇
  1994年   25102篇
  1993年   23453篇
  1992年   85251篇
  1991年   81639篇
  1990年   78859篇
  1989年   76133篇
  1988年   69538篇
  1987年   68060篇
  1986年   63606篇
  1985年   60577篇
  1984年   44989篇
  1983年   38005篇
  1982年   22484篇
  1981年   20015篇
  1979年   39004篇
  1978年   27466篇
  1977年   23277篇
  1976年   21519篇
  1975年   22836篇
  1974年   26800篇
  1973年   25381篇
  1972年   23767篇
  1971年   21972篇
  1970年   20208篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.

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   
63.
64.
65.

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   
66.
67.
68.
69.
Henna, derived from a combination of natural leaves and coloring additives, is a common decorative dye traditionally used in many Islamic religious celebrations. Para‐phenylenediamine (PPD), a major component of black henna tattoo, is a strong sensitizer and common allergen. We report a case of severe connubial allergic contact dermatitis after black henna heterotransfer in a girl.  相似文献   
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