全文获取类型
收费全文 | 25650篇 |
免费 | 1986篇 |
国内免费 | 101篇 |
专业分类
耳鼻咽喉 | 217篇 |
儿科学 | 591篇 |
妇产科学 | 400篇 |
基础医学 | 3497篇 |
口腔科学 | 328篇 |
临床医学 | 2769篇 |
内科学 | 5788篇 |
皮肤病学 | 312篇 |
神经病学 | 2324篇 |
特种医学 | 835篇 |
外科学 | 4246篇 |
综合类 | 276篇 |
现状与发展 | 1篇 |
一般理论 | 25篇 |
预防医学 | 1888篇 |
眼科学 | 403篇 |
药学 | 1778篇 |
中国医学 | 44篇 |
肿瘤学 | 2015篇 |
出版年
2023年 | 258篇 |
2022年 | 453篇 |
2021年 | 997篇 |
2020年 | 513篇 |
2019年 | 811篇 |
2018年 | 928篇 |
2017年 | 649篇 |
2016年 | 665篇 |
2015年 | 758篇 |
2014年 | 1040篇 |
2013年 | 1308篇 |
2012年 | 2065篇 |
2011年 | 2088篇 |
2010年 | 1118篇 |
2009年 | 968篇 |
2008年 | 1608篇 |
2007年 | 1601篇 |
2006年 | 1460篇 |
2005年 | 1412篇 |
2004年 | 1343篇 |
2003年 | 1247篇 |
2002年 | 1224篇 |
2001年 | 179篇 |
2000年 | 139篇 |
1999年 | 214篇 |
1998年 | 247篇 |
1997年 | 202篇 |
1996年 | 160篇 |
1995年 | 158篇 |
1994年 | 160篇 |
1993年 | 126篇 |
1992年 | 112篇 |
1991年 | 73篇 |
1990年 | 94篇 |
1989年 | 69篇 |
1988年 | 72篇 |
1987年 | 90篇 |
1986年 | 78篇 |
1985年 | 65篇 |
1984年 | 96篇 |
1983年 | 80篇 |
1982年 | 89篇 |
1981年 | 81篇 |
1980年 | 84篇 |
1979年 | 49篇 |
1978年 | 56篇 |
1977年 | 44篇 |
1975年 | 36篇 |
1974年 | 35篇 |
1973年 | 34篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Elizabeth D. Krebs Robert B. Hawkins J. Hunter Mehaffey Clifford E. Fonner Alan M. Speir Mohammed A. Quader Jeffrey B. Rich Leora T. Yarboro Nicholas R. Teman Gorav Ailawadi 《The Journal of thoracic and cardiovascular surgery》2019,157(4):1533-1542.e2
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3.
Emma J. Kilford Iroise Dumontheil Nicholas W. Wood Sarah-Jayne Blakemore 《Social cognitive and affective neuroscience》2015,10(6):777-782
The catechol-O-methyltransferase (COMT) enzyme is a major determinant of prefrontal dopamine levels. The Val158Met polymorphism affects COMT enzymatic activity and has been associated with variation in executive function and affective processing. This study investigated the effect of COMT genotype on the flexible modulation of the balance between processing self-generated and processing stimulus-oriented information, in the presence or absence of affective distractors. Analyses included 124 healthy adult participants, who were also assessed on standard working memory (WM) tasks. Relative to Val carriers, Met homozygotes made fewer errors when selecting and manipulating self-generated thoughts. This effect was partly accounted for by an association between COMT genotype and visuospatial WM performance. We also observed a complex interaction between the influence of affective distractors, COMT genotype and sex on task accuracy: male, but not female, participants showed a sensitivity to the affective distractors that was dependent on COMT genotype. This was not accounted for by WM performance. This study provides novel evidence of the role of dopaminergic genetic variation on the ability to select and manipulate self-generated thoughts. The results also suggest sexually dimorphic effects of COMT genotype on the influence of affective distractors on executive function. 相似文献
4.
5.
Andrea Stracciolini Jennifer Luz Gregory Walker Nicholas M. Edwards Avery D. Faigenbaum Gregory D. Myer 《The Physician and sportsmedicine》2020,48(2):199-207
ABSTRACT
Objective
To investigate primary care physician clinical practice patterns, barriers, and education surrounding pediatric physical activity (PA), and to compare practice patterns by discipline. 相似文献6.
7.
8.
9.
10.