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   25513篇
  免费   1724篇
  国内免费   597篇
耳鼻咽喉   141篇
儿科学   496篇
妇产科学   403篇
基础医学   1802篇
口腔科学   263篇
临床医学   3399篇
内科学   7246篇
皮肤病学   102篇
神经病学   354篇
特种医学   701篇
外科学   7261篇
综合类   2968篇
现状与发展   1篇
预防医学   747篇
眼科学   252篇
药学   1184篇
  17篇
中国医学   224篇
肿瘤学   273篇
  2024年   31篇
  2023年   574篇
  2022年   911篇
  2021年   1509篇
  2020年   1484篇
  2019年   1374篇
  2018年   1291篇
  2017年   883篇
  2016年   798篇
  2015年   905篇
  2014年   1911篇
  2013年   1813篇
  2012年   1213篇
  2011年   1425篇
  2010年   1157篇
  2009年   1166篇
  2008年   1069篇
  2007年   1030篇
  2006年   970篇
  2005年   850篇
  2004年   720篇
  2003年   630篇
  2002年   551篇
  2001年   443篇
  2000年   392篇
  1999年   329篇
  1998年   281篇
  1997年   248篇
  1996年   224篇
  1995年   200篇
  1994年   189篇
  1993年   161篇
  1992年   154篇
  1991年   101篇
  1990年   94篇
  1989年   88篇
  1988年   87篇
  1987年   92篇
  1986年   79篇
  1985年   76篇
  1984年   72篇
  1983年   47篇
  1982年   56篇
  1981年   30篇
  1980年   30篇
  1979年   31篇
  1978年   18篇
  1976年   15篇
  1975年   11篇
  1973年   7篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
Secondary tricuspid regurgitation (TR) caused by right ventricular enlargement in the setting of left heart disease/pulmonary hypertension has been well described. In contrast, that associated with right atrial enlargement—atrial functional TR (AF‐TR)—remains largely underappreciated. AF‐TR most often occurs in the setting of lone atrial fibrillation, although it is also seen in its absence (idiopathic AF‐TR). Several recent studies have found that the prevalence, hemodynamic significance, and prognosis of AF‐TR are not inconsequential, suggesting increased physician awareness of this novel clinical entity is warranted. This article discusses the pathogenesis, echocardiographic findings, and treatment of this underappreciated cause of secondary TR.  相似文献   
3.
4.
目的:调查心脏瓣膜置换术后患者的出院准备度现状,并分析其影响因素。方法:于2018年9月至2019年3月用一般资料、出院准备度量表、出院指导质量量表对139例瓣膜置换术后患者进行调查。结果:心脏瓣膜置换术后患者的出院准备度总分为(89.51±8.53)分,与出院指导质量呈正相关;多元回归分析显示,主要照顾者、婚姻状况、工作状态、服药种类、出院指导质量为出院准备度影响因素。结论:心脏瓣膜置换术后患者的出院准备度有待提高,患者感知的个人状态得分不理想;护士应鼓励患者配合进行早期康复,强化出院指导,采取有效措施提供康复信息,满足患者及其家属需求,提高出院准备度。  相似文献   
5.

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   
6.
Valvular heart disease affects patients of all ages, with the highest incidence in patients older than 75 years. The nurse practitioner, whether in the primary or acute care setting, plays a vital role in the detection, monitoring, and shared decisions in treatment options. Assessment skills in conjunction with appropriate testing can identify patients early in the trajectory of the disease. The purpose of this article is to provide tips for history-taking and physical exam techniques, identify appropriate diagnostic testing, and review treatment options for adults with valvular heart disease.  相似文献   
7.
8.
9.
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