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   2859385篇
  免费   215237篇
  国内免费   10488篇
耳鼻咽喉   37213篇
儿科学   93682篇
妇产科学   77211篇
基础医学   410414篇
口腔科学   80459篇
临床医学   267233篇
内科学   558495篇
皮肤病学   63688篇
神经病学   230344篇
特种医学   109381篇
外国民族医学   682篇
外科学   422225篇
综合类   65952篇
现状与发展   5篇
一般理论   965篇
预防医学   235186篇
眼科学   63557篇
药学   208073篇
  14篇
中国医学   6665篇
肿瘤学   153666篇
  2018年   31253篇
  2017年   24046篇
  2016年   27337篇
  2015年   30920篇
  2014年   42908篇
  2013年   65822篇
  2012年   85247篇
  2011年   91058篇
  2010年   54783篇
  2009年   51908篇
  2008年   84243篇
  2007年   89557篇
  2006年   91000篇
  2005年   87555篇
  2004年   83946篇
  2003年   80534篇
  2002年   77603篇
  2001年   132013篇
  2000年   135576篇
  1999年   113633篇
  1998年   33361篇
  1997年   29605篇
  1996年   30187篇
  1995年   29530篇
  1994年   27640篇
  1993年   25807篇
  1992年   92193篇
  1991年   90139篇
  1990年   87268篇
  1989年   83727篇
  1988年   77538篇
  1987年   75851篇
  1986年   72078篇
  1985年   69025篇
  1984年   52216篇
  1983年   44226篇
  1982年   26776篇
  1981年   23950篇
  1979年   47597篇
  1978年   34220篇
  1977年   28649篇
  1976年   27264篇
  1975年   28532篇
  1974年   34192篇
  1973年   32947篇
  1972年   30630篇
  1971年   28406篇
  1970年   26422篇
  1969年   24512篇
  1968年   23107篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.

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   
4.
5.
We report two British cases of liver abscess, due to Klebsiella pneumoniae and associated with synchronous infection elsewhere, which required liver resection for definitive treatment. They illustrate the geographic spread of aggressive K pneumoniae liver infection and demonstrate the importance of early aggressive treatment.  相似文献   
6.
7.
8.
9.
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   
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