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   2581834篇
  免费   189292篇
  国内免费   7554篇
耳鼻咽喉   34264篇
儿科学   85202篇
妇产科学   71577篇
基础医学   363543篇
口腔科学   69666篇
临床医学   234263篇
内科学   514996篇
皮肤病学   62459篇
神经病学   213360篇
特种医学   99865篇
外国民族医学   736篇
外科学   386423篇
综合类   50375篇
现状与发展   5篇
一般理论   968篇
预防医学   195918篇
眼科学   56642篇
药学   187952篇
  8篇
中国医学   5336篇
肿瘤学   145122篇
  2021年   19998篇
  2019年   20643篇
  2018年   29296篇
  2017年   22603篇
  2016年   26231篇
  2015年   29523篇
  2014年   40471篇
  2013年   60460篇
  2012年   80254篇
  2011年   84524篇
  2010年   51027篇
  2009年   49150篇
  2008年   79061篇
  2007年   83872篇
  2006年   85602篇
  2005年   81750篇
  2004年   78749篇
  2003年   76078篇
  2002年   73349篇
  2001年   128419篇
  2000年   131338篇
  1999年   110504篇
  1998年   31256篇
  1997年   27925篇
  1996年   28218篇
  1995年   27384篇
  1994年   25068篇
  1993年   23421篇
  1992年   85166篇
  1991年   81566篇
  1990年   78785篇
  1989年   76064篇
  1988年   69474篇
  1987年   67999篇
  1986年   63544篇
  1985年   60513篇
  1984年   44942篇
  1983年   37949篇
  1982年   22456篇
  1981年   19984篇
  1979年   38962篇
  1978年   27441篇
  1977年   23256篇
  1976年   21496篇
  1975年   22814篇
  1974年   26787篇
  1973年   25372篇
  1972年   23750篇
  1971年   21958篇
  1970年   20184篇
排序方式: 共有10000条查询结果,搜索用时 375 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