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   2581449篇
  免费   189416篇
  国内免费   7568篇
耳鼻咽喉   34283篇
儿科学   85189篇
妇产科学   71573篇
基础医学   363478篇
口腔科学   69695篇
临床医学   234165篇
内科学   514623篇
皮肤病学   62488篇
神经病学   213405篇
特种医学   99962篇
外国民族医学   736篇
外科学   386633篇
综合类   50330篇
现状与发展   5篇
一般理论   968篇
预防医学   195574篇
眼科学   56587篇
药学   188094篇
  8篇
中国医学   5337篇
肿瘤学   145300篇
  2021年   20026篇
  2019年   20685篇
  2018年   29362篇
  2017年   22657篇
  2016年   26279篇
  2015年   29575篇
  2014年   40517篇
  2013年   60515篇
  2012年   80378篇
  2011年   84663篇
  2010年   51097篇
  2009年   49219篇
  2008年   79170篇
  2007年   84013篇
  2006年   85713篇
  2005年   81913篇
  2004年   78893篇
  2003年   76216篇
  2002年   73474篇
  2001年   128490篇
  2000年   131411篇
  1999年   110555篇
  1998年   31292篇
  1997年   27946篇
  1996年   28249篇
  1995年   27406篇
  1994年   25084篇
  1993年   23429篇
  1992年   85193篇
  1991年   81602篇
  1990年   78817篇
  1989年   76094篇
  1988年   69493篇
  1987年   68025篇
  1986年   63569篇
  1985年   60531篇
  1984年   44957篇
  1983年   37961篇
  1982年   22451篇
  1981年   19913篇
  1979年   38910篇
  1978年   27381篇
  1977年   23178篇
  1976年   21424篇
  1975年   22766篇
  1974年   26744篇
  1973年   25344篇
  1972年   23744篇
  1971年   21949篇
  1970年   20164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