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   2611342篇
  免费   191792篇
  国内免费   7591篇
耳鼻咽喉   34710篇
儿科学   85991篇
妇产科学   72381篇
基础医学   367663篇
口腔科学   70518篇
临床医学   238102篇
内科学   519615篇
皮肤病学   62753篇
神经病学   215808篇
特种医学   101168篇
外国民族医学   737篇
外科学   390171篇
综合类   50944篇
现状与发展   5篇
一般理论   990篇
预防医学   199588篇
眼科学   57346篇
药学   190205篇
  10篇
中国医学   5368篇
肿瘤学   146652篇
  2021年   20404篇
  2019年   21031篇
  2018年   29799篇
  2017年   22989篇
  2016年   26606篇
  2015年   29927篇
  2014年   41030篇
  2013年   61435篇
  2012年   81657篇
  2011年   85944篇
  2010年   51788篇
  2009年   49809篇
  2008年   80291篇
  2007年   85184篇
  2006年   86937篇
  2005年   83060篇
  2004年   79985篇
  2003年   77186篇
  2002年   74537篇
  2001年   129216篇
  2000年   132243篇
  1999年   111231篇
  1998年   31659篇
  1997年   28219篇
  1996年   28546篇
  1995年   27682篇
  1994年   25325篇
  1993年   23693篇
  1992年   85811篇
  1991年   82183篇
  1990年   79426篇
  1989年   76663篇
  1988年   70036篇
  1987年   68559篇
  1986年   64074篇
  1985年   61048篇
  1984年   45367篇
  1983年   38319篇
  1982年   22727篇
  1981年   20255篇
  1979年   39380篇
  1978年   27764篇
  1977年   23531篇
  1976年   21766篇
  1975年   23060篇
  1974年   27089篇
  1973年   25672篇
  1972年   24088篇
  1971年   22255篇
  1970年   20467篇
排序方式: 共有10000条查询结果,搜索用时 78 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.
69.

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   
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