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   4205882篇
  免费   339841篇
  国内免费   13826篇
耳鼻咽喉   58606篇
儿科学   134705篇
妇产科学   110312篇
基础医学   650613篇
口腔科学   113372篇
临床医学   381712篇
内科学   759547篇
皮肤病学   105873篇
神经病学   349674篇
特种医学   163555篇
外国民族医学   503篇
外科学   646588篇
综合类   119209篇
现状与发展   23篇
一般理论   2562篇
预防医学   352670篇
眼科学   98759篇
药学   294316篇
  26篇
中国医学   11298篇
肿瘤学   205626篇
  2021年   55696篇
  2020年   35457篇
  2019年   58396篇
  2018年   73615篇
  2017年   56239篇
  2016年   62279篇
  2015年   75324篇
  2014年   109644篇
  2013年   174770篇
  2012年   120490篇
  2011年   125957篇
  2010年   125141篇
  2009年   126494篇
  2008年   112320篇
  2007年   119661篇
  2006年   128447篇
  2005年   123613篇
  2004年   123896篇
  2003年   114314篇
  2002年   103567篇
  2001年   149668篇
  2000年   144522篇
  1999年   134292篇
  1998年   70076篇
  1997年   66198篇
  1996年   64409篇
  1995年   59687篇
  1994年   53771篇
  1993年   50037篇
  1992年   96042篇
  1991年   92636篇
  1990年   89048篇
  1989年   86811篇
  1988年   80014篇
  1987年   78507篇
  1986年   73852篇
  1985年   72976篇
  1984年   61659篇
  1983年   55426篇
  1982年   46016篇
  1981年   43115篇
  1980年   40503篇
  1979年   53098篇
  1978年   44031篇
  1977年   38883篇
  1976年   36264篇
  1975年   36271篇
  1974年   39407篇
  1973年   37631篇
  1972年   35242篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.

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   
122.
Erosive pustular dermatosis of the scalp (EPDS) is an uncommon chronic inflammatory response to scalp trauma that usually resolves with cicatricial alopecia. It most commonly affects elderly patients with a history of actinic damage. Herein, we describe a 16‐year‐old girl with acrofacial dysostosis type 1 presenting after surgery with crusting purulent scalp lesions, whose clinical presentation and histopathologic findings were consistent with EPDS. A review of the literature on EPDS in children is also detailed.  相似文献   
123.
124.
125.
126.
127.
128.
129.
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   
130.
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