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   17851篇
  免费   1175篇
  国内免费   66篇
耳鼻咽喉   170篇
儿科学   401篇
妇产科学   446篇
基础医学   2649篇
口腔科学   698篇
临床医学   2100篇
内科学   3693篇
皮肤病学   347篇
神经病学   1715篇
特种医学   489篇
外科学   1828篇
综合类   103篇
一般理论   9篇
预防医学   1708篇
眼科学   255篇
药学   1358篇
中国医学   104篇
肿瘤学   1019篇
  2023年   166篇
  2022年   110篇
  2021年   445篇
  2020年   304篇
  2019年   518篇
  2018年   691篇
  2017年   494篇
  2016年   537篇
  2015年   690篇
  2014年   759篇
  2013年   1060篇
  2012年   1595篇
  2011年   1624篇
  2010年   765篇
  2009年   636篇
  2008年   1193篇
  2007年   1185篇
  2006年   1122篇
  2005年   1054篇
  2004年   1013篇
  2003年   908篇
  2002年   822篇
  2001年   131篇
  2000年   111篇
  1999年   99篇
  1998年   76篇
  1997年   64篇
  1996年   78篇
  1995年   57篇
  1994年   38篇
  1993年   42篇
  1992年   52篇
  1991年   43篇
  1990年   49篇
  1989年   35篇
  1988年   29篇
  1987年   36篇
  1986年   43篇
  1985年   35篇
  1984年   51篇
  1983年   29篇
  1982年   35篇
  1981年   43篇
  1980年   30篇
  1979年   22篇
  1978年   14篇
  1977年   12篇
  1975年   15篇
  1974年   13篇
  1970年   13篇
排序方式: 共有10000条查询结果,搜索用时 21 毫秒
1.
Post-induction hypotension is common and associated with postoperative complications. We hypothesised that pneumatic leg compression reduces post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy. In this double-blind randomised study, patients were allocated randomly to the pneumatic leg compression group (n = 50) or control (n = 50). In the intervention group, pneumatic leg compression was initiated before induction of anaesthesia. In the control group, pneumatic leg compression was initiated 20 min after anaesthesia induction. The primary outcome was the incidence of post-induction hypotension in these groups. Post-induction hypotension was defined as systolic blood pressure < 90 mmHg during the first 20 min after induction. Haemodynamic variables and area under the curve of post-induction systolic blood pressure over time were assessed. Complications associated with pneumatic leg compression were recorded, including: peripheral neuropathy; compartment syndrome; extensive bullae beneath the leg sleeves; and pulmonary thromboembolism. The incidence of post-induction hypotension decreased in the pneumatic leg compression group compared with that in the control group; 5 (10%) vs. 29 (58%), respectively, p < 0.001. In the pneumatic leg compression group, the lowest systolic, diastolic and mean blood pressures 20 min after induction of anaesthesia were significantly greater than the control group. Pneumatic leg compression resulted in an increased area under the curve of systolic blood pressure in the first 20 min after induction, p = 0.001. There were no pneumatic leg compression-related complications. Pneumatic leg compression reduced post-induction hypotension in elderly patients undergoing robot-assisted laparoscopic prostatectomy, suggesting that it is an effective and safe intervention to prevent post-induction hypotension among elderly patients undergoing general anaesthesia.  相似文献   
2.
3.
4.
Clinical Oral Investigations - The objective of this systematic review and meta-analysis (SRM) was to answer the question whether the use of ultrasonic irrigation (UI) results in less postoperative...  相似文献   
5.
6.
Cardiovascular Drugs and Therapy - Major depressive disorder (MDD) and anxiety disorders (AD) are both highly prevalent among individuals with arrhythmia, ischemic heart disease, heart failure,...  相似文献   
7.
Fear is central to conceptualizations of weight and shape-focused eating disorders. The current study will examine the reliability and validity of a test meal paradigm that varies perceptions of fat content to manipulate fear. Undergraduate women with elevated eating pathology (N = 96) will be randomized to one of three test meal conditions: two “low” fat yogurts, two “high” fat yogurts, or one “high” fat and one “low” fat yogurt. In actuality, all yogurts will have the same fat content. Supporting reliability, we hypothesize that self-reported fear and electrodermal activity (psychophysiological index of fear-related arousal) will exhibit good test–retest reliability over a 48-hr period in the “high” fat/“high” fat and “low” fat/“low” fat conditions. Supporting construct validity, self-reported fear and electrodermal activity will be elevated during the “high” versus “low” fat condition and responses to the “high" fat condition will correlate with fear of food, eating, and weight gain. Supporting discriminant validity, self-reported disgust and anger will be comparable in the “high” and “low” fat conditions and will exhibit weak correlations with trait measures of disgust and anger. This experimental paradigm will allow researchers to manipulate fear in order understand the mechanisms by which fear maintains eating pathology.  相似文献   
8.
Neurosurgical Review - Cellular response to TBI is a mixture of excitotoxicity, neuroinflammation, and cell death. Biomarkers that can track these lesions and inflammatory processes are being...  相似文献   
9.
10.
We designed a systematic literature review to identify available evidence on adherence to and persistence with antidiabetic medication in people with type 2 diabetes (T2D). Electronic screening and congress searches identified real-world noninterventional studies (published between 2010 and October 2020) reporting estimates of adherence to and persistence with antidiabetic medication in adults with T2D, and associations with glycaemic control, microvascular and/or macrovascular complications, hospitalizations and healthcare costs. Ninety-two relevant studies were identified, the majority of which were retrospective and reported US data. The proportions of patients considered adherent (median [range] 51.2% [9.4%-84.3%]) or persistent (median [range] 47.7% [16.9%-94.0%]) varied widely across studies. Multiple studies reported an association between greater adherence/persistence and greater reductions in glycated haemoglobin levels. Better adherence/persistence was associated with fewer microvascular and/or macrovascular outcomes, although there was little consistency across studies in terms of which outcomes were improved. More adherent and more persistent patients were typically less likely to be hospitalized or to have emergency department visits/admissions and spent fewer days in hospital annually than less adherent/persistent patients. Greater adherence and persistence were generally associated with lower hospitalization costs, higher pharmacy costs and lower or budget-neutral total healthcare costs compared with lower adherence/persistence. In conclusion, better adherence and persistence in people with T2D is associated with lower rates of microvascular and/or macrovascular outcomes and inpatient hospitalization, and lower or budget-neutral total healthcare expenditure. Education and treatment strategies to address suboptimal adherence and persistence are needed to improve clinical and economic outcomes.  相似文献   
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