全文获取类型
| 收费全文 | 10455篇 |
| 免费 | 1056篇 |
| 国内免费 | 28篇 |
专业分类
| 耳鼻咽喉 | 70篇 |
| 儿科学 | 325篇 |
| 妇产科学 | 310篇 |
| 基础医学 | 1498篇 |
| 口腔科学 | 279篇 |
| 临床医学 | 970篇 |
| 内科学 | 1840篇 |
| 皮肤病学 | 214篇 |
| 神经病学 | 682篇 |
| 特种医学 | 991篇 |
| 外科学 | 1591篇 |
| 综合类 | 273篇 |
| 一般理论 | 7篇 |
| 预防医学 | 996篇 |
| 眼科学 | 220篇 |
| 药学 | 598篇 |
| 中国医学 | 5篇 |
| 肿瘤学 | 670篇 |
出版年
| 2021年 | 130篇 |
| 2020年 | 84篇 |
| 2019年 | 169篇 |
| 2018年 | 174篇 |
| 2017年 | 127篇 |
| 2016年 | 141篇 |
| 2015年 | 162篇 |
| 2014年 | 205篇 |
| 2013年 | 325篇 |
| 2012年 | 401篇 |
| 2011年 | 420篇 |
| 2010年 | 296篇 |
| 2009年 | 314篇 |
| 2008年 | 444篇 |
| 2007年 | 413篇 |
| 2006年 | 451篇 |
| 2005年 | 416篇 |
| 2004年 | 363篇 |
| 2003年 | 336篇 |
| 2002年 | 332篇 |
| 2001年 | 306篇 |
| 2000年 | 316篇 |
| 1999年 | 274篇 |
| 1998年 | 243篇 |
| 1997年 | 228篇 |
| 1996年 | 242篇 |
| 1995年 | 215篇 |
| 1994年 | 172篇 |
| 1993年 | 172篇 |
| 1992年 | 241篇 |
| 1991年 | 218篇 |
| 1990年 | 199篇 |
| 1989年 | 267篇 |
| 1988年 | 192篇 |
| 1987年 | 235篇 |
| 1986年 | 210篇 |
| 1985年 | 222篇 |
| 1984年 | 162篇 |
| 1983年 | 145篇 |
| 1982年 | 129篇 |
| 1981年 | 74篇 |
| 1980年 | 101篇 |
| 1979年 | 128篇 |
| 1978年 | 83篇 |
| 1977年 | 87篇 |
| 1976年 | 82篇 |
| 1975年 | 79篇 |
| 1974年 | 74篇 |
| 1973年 | 71篇 |
| 1968年 | 63篇 |
排序方式： 共有10000条查询结果，搜索用时 171 毫秒
1.
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2.
3.
4.
Toshiro Hara Rony Chanoch-Myers Nathan D. Mathewson Chad Myskiw Lyla Atta Lillian Bussema Stephen W. Eichhorn Alissa C. Greenwald Gabriela S. Kinker Christopher Rodman L. Nicolas Gonzalez Castro Hiroaki Wakimoto Orit Rozenblatt-Rosen Xiaowei Zhuang Jean Fan Tony Hunter Inder M. Verma Kai W. Wucherpfennig Itay Tirosh 《Cancer cell》2021,39(6):779-792.e11
- Download : Download high-res image (228KB)
- Download : Download full-size image
5.
Ferdynand Hebal Elissa Port Catherine J. Hunter Bryan Malas Jared Green Marleta Reynolds 《Journal of pediatric surgery》2019,54(4):656-662
Background/purpose
Computed tomography (CT) derived Haller Index (HI) remains the standard for quantifying severity in patient with pectus excavatum (PE). Optical scanning described in literature reports optimistic results and new indices that correlate with HI. This study assessed the feasibility of a handheld White Light Scanner (WLS) to obtain 3D measurements and indices of PE deformity.Methods
From April 2015–April 2017, WLS scanning was conducted by orthotists during clinical visits. Included were children with PE up to 18?years. Analysis assessed correlation of a WLS-derived severity index, Hebal-Malas Index (HMI), with physician measured PE Depth (PED), and CT-derived HI.Results
Of 195 participants, 185(94%) patients with PE were scanned and 127(69%) had complete WLS data. For 88 patients undergoing monitoring, HMI correlated with PED (r?=?0.42, p?=?0.004). For 39 patients with pre-operative CT, HMI demonstrated strong correlation with HI (r?=?0.87, p < 0.0001).Conclusions
WLS demonstrated high feasibility of scanning PE. WLS-derived HMI best correlates with HI for patients with severe pectus deformity. Our current data is suggestive that WLS is best applied for severe deformities and yet to be established for milder deformities. Future yearly WLS will provide data on deformity progression and surgical therapy.Level of Evidence
IV.Type of Study
Diagnostic Study. 相似文献6.
7.
8.
Deng H. Le W. - D. Hunter C. B. 《世界核心医学期刊文摘》2006,2(6):17-18
背景：Parkin基因（PRKN）突变可导致常染色体隐性遗传性早发帕金森病（EOPD）。目的：探讨EOPD白人家族PRKN突变的表现和基因型-表型关系。设计：对EOPD家族的3代20例成员进行基因分析，该家族有4例患者。应用直接基因组DNA测序、半定量聚合酶链反应、实时定量聚合酶链反应以及逆转录酶聚合酶链反应分析以确定PRKN突变。结果：4例早发患者（年龄30—38岁）被确定有PRKN复合杂合突变（T240M和EX5_6缺失），虽然PRKN的杂合T240M和纯合EX5_6缺失突变已有描述，但是据悉，本文为上述复合杂合突变的首次报道。患者的表型为典型常染色体隐性遗传性EOPD的表现，其特征是对左旋多巴治疗有效、相对缓慢的进展和运动障碍。所有杂合突变的基因携带者（T240M或EX5_6缺失）和1例56岁的复合杂合突变女性携带者（T240M和EX5_6缺失）无任何神经系统症状。结论：研究发现，PRKN基因复合杂合突变（T240M和EX5_6缺失）导致一个大的白人家族中4例成员发生常染色体隐性遗传性EOPD。另外1例成员具有相同的突变，比4例患者的平均发病年龄大10岁，并且无本病的临床表现。不完全的外显率对遗传咨询具有暗示作用，并且提示复杂的基因一环境交互作用在PRKN相关EOPD的发病机制中发挥作用。 相似文献
9.
10.
Contin Educ Anaesth Crit 相似文献