全文获取类型
收费全文 | 29947篇 |
免费 | 1992篇 |
国内免费 | 107篇 |
专业分类
耳鼻咽喉 | 412篇 |
儿科学 | 1346篇 |
妇产科学 | 717篇 |
基础医学 | 2918篇 |
口腔科学 | 615篇 |
临床医学 | 2508篇 |
内科学 | 7069篇 |
皮肤病学 | 507篇 |
神经病学 | 1572篇 |
特种医学 | 962篇 |
外国民族医学 | 5篇 |
外科学 | 5399篇 |
综合类 | 718篇 |
一般理论 | 7篇 |
预防医学 | 1766篇 |
眼科学 | 1115篇 |
药学 | 2303篇 |
1篇 | |
中国医学 | 138篇 |
肿瘤学 | 1968篇 |
出版年
2023年 | 249篇 |
2022年 | 468篇 |
2021年 | 1245篇 |
2020年 | 647篇 |
2019年 | 949篇 |
2018年 | 1056篇 |
2017年 | 788篇 |
2016年 | 823篇 |
2015年 | 858篇 |
2014年 | 1244篇 |
2013年 | 1530篇 |
2012年 | 2329篇 |
2011年 | 2187篇 |
2010年 | 1285篇 |
2009年 | 1025篇 |
2008年 | 1558篇 |
2007年 | 1494篇 |
2006年 | 1452篇 |
2005年 | 1352篇 |
2004年 | 1174篇 |
2003年 | 1042篇 |
2002年 | 935篇 |
2001年 | 563篇 |
2000年 | 590篇 |
1999年 | 481篇 |
1998年 | 223篇 |
1997年 | 177篇 |
1996年 | 154篇 |
1995年 | 156篇 |
1994年 | 134篇 |
1993年 | 116篇 |
1992年 | 326篇 |
1991年 | 284篇 |
1990年 | 260篇 |
1989年 | 255篇 |
1988年 | 204篇 |
1987年 | 210篇 |
1986年 | 179篇 |
1985年 | 185篇 |
1984年 | 170篇 |
1983年 | 169篇 |
1982年 | 92篇 |
1981年 | 96篇 |
1979年 | 130篇 |
1978年 | 99篇 |
1977年 | 81篇 |
1974年 | 90篇 |
1973年 | 127篇 |
1972年 | 124篇 |
1971年 | 92篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
Rohi Shah Nomaan Sheikh Jitendra Mangwani Nicolette Morgan Hamidreza Khairandish 《Journal of Clinical Orthopaedics and Trauma》2021,12(1):138
Demographic projections for hip fragility fractures indicate a rising annual incidence by virtue of a multimorbid, ageing population with more noncommunicable diseases (NCDs). NCDs are characterised by slow progression and long duration ranging from ischaemic cardiovascular disease, cerebrovascular disease, diabetes, chronic obstructive pulmonary disease to various cancers. Management of this disease burden often involves commencing patients on oral anticoagulants to reduce the risk of thromboembolic events. The use of direct oral anticoagulants (DOACs) in clinical practice has increased due to their rapid onset of action, short half-life and predictable anticoagulant effects, without the need for routine monitoring. Safe and timely surgical intervention relies on reversal of anticoagulants. However, the lack of specific evidence-based guidelines for the perioperative management of patients on DOACs with hip fractures has proved challenging; in particular, the accessibility of DOAC-specific assays, justification of the cost-benefit ratio of targeted reversal agents and indications for neuraxial anaesthesia. This has led to potentially avoidable delays in surgical intervention. Following a literature review of the pharmacokinetic and pharmacodynamics of commonly used DOACs in our region including the role of surrogate markers, we propose a systematic, evidence-based guideline to the perioperative management of hip fractures DOACs. We believe this standardised protocol can be easily replicated between hospitals. We recommend that if patients are deemed suitable for a general anaesthesia, with satisfactory renal function, optimal surgical time should be 24 h following the last ingested dose of DOAC. 相似文献
5.
6.
7.
8.
Alexander C. Egbe Rosalyn Adigun Vidhu Anand Collin P. West Victor M. Montori Hassan M. Murad Emmanuel Akintoye Karim Osman Heidi M. Connolly 《The Canadian journal of cardiology》2019,35(12):1784-1790
BackgroundAlthough there are robust data about the pathophysiology and prognostic implications of left ventricular (LV) systolic dysfunction in patients with acquired heart disease, similar prognostic data about LV systolic dysfunction are sparse in the tetralogy of Fallot (TOF) population. The purpose of this study was to perform a meta-analysis of all studies that assessed the relationship between LV ejection fraction (LVEF) and cardiovascular adverse events (CAEs) defined as death, aborted sudden death, or sustained ventricular tachycardia.MethodsWe used random-effects models to calculate hazard ratios (HRs) and 95% confidence intervals (CIs).ResultsOf the 1,809 citations, 7 studies with 2,854 patients (age 28 ± 4 years) were included. During 5.6 ± 3.4 years' follow-up, there were 82 deaths, 17 aborted sudden cardiac deaths, and 56 sustained ventricular tachycardia events. Overall, CAEs occurred in 5.1% (144 patients). As a continuous variable, LVEF was a predictor of CAE (HR 1.29, 95% CI, 1.09-1.53, P = 0.001) per 5% decrease in LVEF. Similarly, LVEF < 40% was also a predictor of CAE (HR 3.22, 95% CI, 2.16-4.80, P < 0.001).ConclusionsLV systolic dysfunction was an independent predictor of CAE, and we observed a 30% increase in the risk of CAE for every 5% decrease in LVEF, and a 3-fold increase in the risk of CAE in patients with LVEF <40% compared with other patients. These findings underscore the importance of incorporating LV systolic function in clinical risk stratification of patients with TOF and the need to explore new treatment options to address this problem. 相似文献
9.
10.
Bryan Mclaughlin JungHwan Yang Woohyun Yoo Bret Shaw Soo Yun Kim Dhavan Shah 《Health communication》2016,31(6):762-771
The growth of online support groups has led to an expression effects paradigm within the health communication literature. Although religious support expression is characterized as a typical subdimension of emotional support, we argue that in the context of a life-threatening illness, the inclusion of a religious component creates a unique communication process. Using data from an online group for women with breast cancer, we test a theoretical expression effects model. Results demonstrate that for breast cancer patients, religious support expression has distinct effects from general emotional support messages, which highlights the need to further theorize expression effects along these lines. 相似文献