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   2280603篇
  免费   170363篇
  国内免费   4621篇
耳鼻咽喉   31568篇
儿科学   70881篇
妇产科学   62564篇
基础医学   324370篇
口腔科学   65222篇
临床医学   200861篇
内科学   448760篇
皮肤病学   52112篇
神经病学   185718篇
特种医学   89608篇
外国民族医学   560篇
外科学   353190篇
综合类   47633篇
现状与发展   4篇
一般理论   704篇
预防医学   166096篇
眼科学   52889篇
药学   167084篇
  4篇
中国医学   5137篇
肿瘤学   130622篇
  2019年   16961篇
  2018年   25249篇
  2017年   19546篇
  2016年   22403篇
  2015年   25233篇
  2014年   34176篇
  2013年   50799篇
  2012年   69660篇
  2011年   72757篇
  2010年   42936篇
  2009年   40660篇
  2008年   69006篇
  2007年   73168篇
  2006年   74195篇
  2005年   72423篇
  2004年   69359篇
  2003年   66820篇
  2002年   64897篇
  2001年   117771篇
  2000年   120835篇
  1999年   100612篇
  1998年   26578篇
  1997年   23717篇
  1996年   23623篇
  1995年   22255篇
  1994年   20325篇
  1993年   18981篇
  1992年   75528篇
  1991年   72298篇
  1990年   69679篇
  1989年   67090篇
  1988年   61443篇
  1987年   60009篇
  1986年   55907篇
  1985年   53589篇
  1984年   39692篇
  1983年   33463篇
  1982年   19204篇
  1981年   16937篇
  1979年   35277篇
  1978年   24390篇
  1977年   20559篇
  1976年   18661篇
  1975年   19946篇
  1974年   24028篇
  1973年   22968篇
  1972年   21662篇
  1971年   20089篇
  1970年   19083篇
  1969年   17816篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
41.
42.

Introduction

Compression fractures of the cuboid bone in children and adolescents are rare. Fracture morphology, associated lesions, treatment options and long-term outcomes of this very rare injury are published in a few case reports. This study with review of the literature aims to support the understanding of fracture pattern and optimize pathways of decision making.

Material and Methods

A retrospective two-center study was performed in a patient cohort treated between 2001 and 2016. All patients aged less than 18 years who sustained a cuboid fracture were included. Age, gender, mechanism of injury, fracture morphology, amount of displacement, associated injuries, and therapy were analyzed. In the follow-up (FU), the AOFAS Midfoot Scale was investigated.

Results

Fractures of the cuboid bone were diagnosed in 7 boys and 9 girls. The mean age of the patients was 10 years (range: 2.2–16.1 years). According to the classification of Fenton we detected 11 (69%) type 2, 2 (12%) type 3 and 3 (19%) type 5b fractures. Other fracture types according to Fenton were not observed. All children under 10 years sustained a type 2 fracture. Open reduction and internal fixation was performed in 5 (31%) patients. Bone grafting was not necessary. FU was performed in 14/16 patients on average after 9 years (mean; range: 1.4–16.2 years). The mean AOFAS Midfoot Scale at FU for extra-articular type 2 fractures was 100 points, whereas in intra-articular fractures (Type 3) and fractures associated with mid-tarsal disruption (type 5b) worse results were found (95 and 66 points, accordingly).

Conclusion

This rare injury shows inhomogenous morphologies and offers different treatment approaches. Extra-articular Fenton type 2 lesions are the most common type of cuboid fracture in children (69%). A potential loss of length of the lateral column must be considered. In contrast to adults, type 1, 4, and 5a fractures were not found in our cohort of children and adolescents. Lower scores of the AOFAS Midfoot Scale were found with either intra-articular involvement or associated midfoot lesions.  相似文献   
43.

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   
44.
45.
Metabolism describes the series of chemical reactions that are concerned with the provision of energy to biological systems. They may be divided into reactions involved in energy yield (catabolism: demand exceeds supply), and energy storage (anabolism: supply exceeds demand). Regulation of these pathways is critical for homeostasis, and derangements in metabolism are seen in a wide variety of pathological processes. Understanding metabolism is key to the treatment of many diseases, notably diabetes, as well as underpinning clinical nutritional support.  相似文献   
46.
47.
48.
49.
50.
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