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   2272463篇
  免费   174524篇
  国内免费   4091篇
耳鼻咽喉   31750篇
儿科学   75005篇
妇产科学   64770篇
基础医学   322240篇
口腔科学   65730篇
临床医学   197759篇
内科学   445900篇
皮肤病学   48552篇
神经病学   183409篇
特种医学   91006篇
外国民族医学   767篇
外科学   348540篇
综合类   54462篇
现状与发展   3篇
一般理论   773篇
预防医学   173274篇
眼科学   52649篇
药学   168895篇
  3篇
中国医学   4291篇
肿瘤学   121300篇
  2018年   21565篇
  2016年   18706篇
  2015年   21555篇
  2014年   30041篇
  2013年   46188篇
  2012年   62240篇
  2011年   65777篇
  2010年   39122篇
  2009年   37452篇
  2008年   62985篇
  2007年   66627篇
  2006年   67506篇
  2005年   65737篇
  2004年   64355篇
  2003年   61702篇
  2002年   60594篇
  2001年   104178篇
  2000年   107753篇
  1999年   91570篇
  1998年   25238篇
  1997年   23061篇
  1996年   22874篇
  1995年   22048篇
  1994年   20762篇
  1993年   19689篇
  1992年   74854篇
  1991年   72478篇
  1990年   70868篇
  1989年   68643篇
  1988年   63774篇
  1987年   62899篇
  1986年   60081篇
  1985年   57755篇
  1984年   43357篇
  1983年   37117篇
  1982年   22010篇
  1981年   19528篇
  1980年   18462篇
  1979年   40893篇
  1978年   28549篇
  1977年   24020篇
  1976年   22676篇
  1975年   24312篇
  1974年   29551篇
  1973年   28411篇
  1972年   26279篇
  1971年   24617篇
  1970年   22960篇
  1969年   21529篇
  1968年   20004篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
Academic output is just one aspect of a successful career as a plastic surgeon. However, for those with a strong interest in academia, the academic output of a department will likely be a key factor when deciding how to rank jobs. The aim of this study was to quantify and rank the academic output of plastic surgery units across the UK and Ireland. The Institute for Scientific Information (ISI) Web of Science Bibliometric analysis tool was used to collate cumulative (1950–2016), 10 year (2006–2016) and 3 years (2013–2015) research output data for plastic surgery units in the UK and Ireland. Sixty-six plastic surgery units were identified. Departments were ranked for each time period according to the number of papers produced, number of citations (Nc) and h-index (a measure of the impact of scientific output). The top 3 departments for number of papers in the last 10 years were The Royal Free Hospital, London (226) Broomfield Hospital, Chelmsford (218), and Morriston Hospital and Swansea (188). The top 3 for h-number were The Royal Free Hospital (21) Wythenshawe Hospital, Manchester (18) and Morriston Hospital (17). Academic output varies across plastic surgery units in the UK and Ireland. A number of departments have consistently maintained high academic outputs across the years and will be of interest to surgeons hoping to pursue a career in academia.  相似文献   
4.

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   
5.
6.
7.
8.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
9.
10.
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