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   2756163篇
  免费   190481篇
  国内免费   7573篇
耳鼻咽喉   35538篇
儿科学   91725篇
妇产科学   74734篇
基础医学   382046篇
口腔科学   71212篇
临床医学   246514篇
内科学   545675篇
皮肤病学   63275篇
神经病学   229172篇
特种医学   108510篇
外国民族医学   736篇
外科学   415456篇
综合类   52864篇
现状与发展   5篇
一般理论   975篇
预防医学   212635篇
眼科学   59336篇
药学   197365篇
  8篇
中国医学   5962篇
肿瘤学   160474篇
  2021年   20134篇
  2019年   20788篇
  2018年   49580篇
  2017年   38687篇
  2016年   45075篇
  2015年   30581篇
  2014年   41362篇
  2013年   61399篇
  2012年   86890篇
  2011年   104203篇
  2010年   68279篇
  2009年   60092篇
  2008年   98023篇
  2007年   105616篇
  2006年   86439篇
  2005年   84572篇
  2004年   82948篇
  2003年   81487篇
  2002年   76771篇
  2001年   128827篇
  2000年   131951篇
  1999年   110769篇
  1998年   31563篇
  1997年   28274篇
  1996年   28412篇
  1995年   27588篇
  1994年   25284篇
  1993年   23590篇
  1992年   85282篇
  1991年   81749篇
  1990年   78968篇
  1989年   76193篇
  1988年   69588篇
  1987年   68104篇
  1986年   63647篇
  1985年   60633篇
  1984年   45017篇
  1983年   38021篇
  1982年   22564篇
  1981年   20028篇
  1979年   39062篇
  1978年   27517篇
  1977年   23272篇
  1976年   21564篇
  1975年   22824篇
  1974年   26829篇
  1973年   25381篇
  1972年   23758篇
  1971年   21966篇
  1970年   20219篇
排序方式: 共有10000条查询结果,搜索用时 31 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