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   1439451篇
  免费   99649篇
  国内免费   3031篇
耳鼻咽喉   21388篇
儿科学   43793篇
妇产科学   41055篇
基础医学   202524篇
口腔科学   43524篇
临床医学   121545篇
内科学   281077篇
皮肤病学   33328篇
神经病学   117012篇
特种医学   58077篇
外国民族医学   435篇
外科学   223302篇
综合类   31522篇
现状与发展   6篇
一般理论   474篇
预防医学   98140篇
眼科学   33712篇
药学   107228篇
  5篇
中国医学   3157篇
肿瘤学   80827篇
  2018年   14169篇
  2017年   11655篇
  2016年   13242篇
  2015年   14141篇
  2014年   19114篇
  2013年   29669篇
  2012年   38642篇
  2011年   41284篇
  2010年   24314篇
  2009年   22572篇
  2008年   39960篇
  2007年   43431篇
  2006年   43650篇
  2005年   42356篇
  2004年   41030篇
  2003年   40024篇
  2002年   39406篇
  2001年   66886篇
  2000年   69443篇
  1999年   57720篇
  1998年   15639篇
  1997年   14313篇
  1996年   13592篇
  1995年   12773篇
  1994年   12004篇
  1992年   43235篇
  1991年   41684篇
  1990年   40934篇
  1989年   39945篇
  1988年   37311篇
  1987年   36757篇
  1986年   35195篇
  1985年   33569篇
  1984年   25259篇
  1983年   21417篇
  1982年   13059篇
  1981年   11901篇
  1979年   24205篇
  1978年   17349篇
  1977年   15124篇
  1976年   13649篇
  1975年   15509篇
  1974年   18326篇
  1973年   17760篇
  1972年   16960篇
  1971年   15883篇
  1970年   15071篇
  1969年   14485篇
  1968年   13611篇
  1967年   12170篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.

Objective

Low psoas muscle area is shown to be an indicator for worse postoperative outcome in patients undergoing vascular surgical. Additionally, it has been associated with longer durations of hospital stay in patients with cancer who undergo surgery and subsequently greater health care costs in Europe and the United States. We sought to evaluate this effect on hospital expenditure for patients undergoing vascular repair in a health care system with universal access.

Methods

Skeletal muscle mass was assessed on preoperative abdominal computed tomography scans of patients undergoing open aortic aneurysm repair in a retrospective fashion. The skeletal muscle index (SMI) was used to define low muscle mass. Health care costs were obtained for all patients and the relationship between a low SMI and higher costs was explored using linear regression and cross-sectional analysis.

Results

We included 156 patients (81.5% male) with a median age of 72 years undergoing elective surgery for infrarenal abdominal aortic aneurysm in this analysis. The median SMI for patients with low skeletal muscle mass was 53.21 cm2/kg and for patients without, 70.07 cm2/kg. Hospital duration of stay was 2 days longer in patients with low skeletal muscle mass as compared with patients with normal (14 days vs 11 days; P = .001), as was duration of intensive care stay (3 days vs 1 day; P = .01). The median overall hospital costs were €10,460 higher for patients with a low SMI as compared with patients with a normal physical constitution (€53,739 [interquartile range, €45,007-€62,471] vs €43,279 [interquartile range, €39,509-€47,049]; P = .001). After confounder adjustment, a low SMI was associated with a 14.68% cost increase in overall hospital costs, for a cost increase of €6521.

Conclusions

Low skeletal muscle mass is independently associated with higher hospital as well as intensive care costs in patients undergoing elective aortic aneurysm repair. Strategies to reduce this risk factor are warranted for these patients.  相似文献   
10.

Introduction

Physician communication impacts patient outcomes. However, communication skills, especially around difficult conversations, remain suboptimal, and there is no clear way to determine the validity of entrustment decisions. The aims of this study were to 1) describe the development of a simulation-based mastery learning (SBML) curriculum for breaking bad news (BBN) conversation skills and 2) set a defensible minimum passing standard (MPS) to ensure uniform skill acquisition among learners.

Innovation

An SBML BBN curriculum was developed for fourth-year medical students. An assessment tool was created to evaluate the acquisition of skills involved in a BBN conversation. Pilot testing was completed to confirm improvement in skill acquisition and set the MPS.

Outcomes

A BBN assessment tool containing a 15-item checklist and six scaled items was developed. Students' checklist performance improved significantly at post-test compared to baseline (mean 65.33%, SD = 12.09% vs mean 88.67%, SD = 9.45%, P < 0.001). Students were also significantly more likely to have at least a score of 4 (on a five-point scale) for the six scaled questions at post-test. The MPS was set at 80%, requiring a score of 12 items on the checklist and at least 4 of 5 for each scaled item. Using the MPS, 30% of students would require additional training after post-testing.

Comments

We developed a SBML curriculum with a comprehensive assessment of BBN skills and a defensible competency standard. Future efforts will expand the mastery model to larger cohorts and assess the impact of rigorous education on patient care outcomes.  相似文献   
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