全文获取类型
收费全文 | 5726篇 |
免费 | 659篇 |
国内免费 | 169篇 |
专业分类
耳鼻咽喉 | 57篇 |
儿科学 | 234篇 |
妇产科学 | 151篇 |
基础医学 | 159篇 |
口腔科学 | 111篇 |
临床医学 | 1277篇 |
内科学 | 1271篇 |
皮肤病学 | 122篇 |
神经病学 | 341篇 |
特种医学 | 189篇 |
外科学 | 1631篇 |
综合类 | 25篇 |
预防医学 | 355篇 |
眼科学 | 326篇 |
药学 | 76篇 |
中国医学 | 1篇 |
肿瘤学 | 228篇 |
出版年
2023年 | 107篇 |
2021年 | 70篇 |
2020年 | 99篇 |
2019年 | 48篇 |
2018年 | 138篇 |
2017年 | 180篇 |
2016年 | 194篇 |
2015年 | 147篇 |
2014年 | 225篇 |
2013年 | 303篇 |
2012年 | 102篇 |
2011年 | 129篇 |
2010年 | 231篇 |
2009年 | 342篇 |
2008年 | 125篇 |
2007年 | 71篇 |
2006年 | 104篇 |
2005年 | 80篇 |
2004年 | 43篇 |
2003年 | 53篇 |
2001年 | 118篇 |
2000年 | 68篇 |
1999年 | 138篇 |
1998年 | 177篇 |
1997年 | 200篇 |
1996年 | 303篇 |
1995年 | 258篇 |
1994年 | 198篇 |
1993年 | 116篇 |
1992年 | 132篇 |
1991年 | 135篇 |
1990年 | 72篇 |
1989年 | 138篇 |
1988年 | 106篇 |
1987年 | 85篇 |
1986年 | 109篇 |
1985年 | 90篇 |
1984年 | 94篇 |
1983年 | 77篇 |
1982年 | 68篇 |
1981年 | 64篇 |
1980年 | 86篇 |
1979年 | 47篇 |
1978年 | 70篇 |
1977年 | 52篇 |
1976年 | 50篇 |
1975年 | 45篇 |
1972年 | 48篇 |
1964年 | 49篇 |
1963年 | 48篇 |
排序方式: 共有6554条查询结果,搜索用时 500 毫秒
101.
Reji Pappy MD Thomas A. Hennebry MB BCH BAO FACC FSCAI Mazen S. Abu‐Fadel MD FACC FSCAI 《Catheterization and cardiovascular interventions》2011,78(4):625-631
Subintimal recanalization is beneficial in selected patients with peripheral chronic total occlusions (CTO). However, in complex cases, re‐entry into the true arterial lumen may prove to be unsuccessful with a conventional guidewire or a re‐entry catheter when using standard femoral artery access. Our case series describes these technical dilemmas along with strategies that can be utilized to overcome these challenges. © 2011 Wiley‐Liss, Inc. 相似文献
102.
Peter A. Sims MSc MB MFCM MRCGP 《Medicine, conflict, and survival》2013,29(3):199-200
Community physicians have recently, albeit often reluctantly, been involved in preparations for nuclear war. This paper suggests an alternative: that they should use their skills in epidemiology and in preventive and social medicine in the prevention of nuclear war. 相似文献
103.
Francisco Leyva MD Abbasin Zegard MB ChB Kiran Patel PhD Jonathan Panting MB ChB Howard Marshall MD Tian Qiu PhD 《Pacing and clinical electrophysiology : PACE》2018,41(3):290-298
1 Background and aims
Right ventricular pacing may lead to heart failure (HF). Upgrades from pacemakers to cardiac resynchronization therapy (CRT) were excluded from most randomized, controlled trials. We sought to determine the long‐term outcomes of upgrading from pacemakers to CRT with (CRT‐D) or without (CRT‐P) defibrillation in patients with no history of sustained ventricular arrhythmias.2 Methods and results
In this observational study, clinical events were quantified in relation to the type of implant (de novo or upgrade) and device type at upgrade (CRT‐P or CRT‐D). Patients underwent CRT implantation (n = 1,545; 1,314 [85%] de novo implants and 231 [15%] upgrades) over a median of 4.6 years [interquartile range: 2.4–7.0]. In analyses of crude event rates, upgrades had a higher total mortality (adjusted hazard ratio [aHR]: 1.33; 95% confidence interval [CI] 0.10–1.61), a higher total mortality or HF hospitalization (aHR: 1.26; 95% CI 1.05–1.51), but similar mortality or hospitalization for major adverse cardiac events (MACEs, aHR: 1.15; 95% CI 0.96–1.38). No group differences emerged in any of these endpoints after propensity score matching. After inverse probability weighting in upgrades, total mortality (HR: 0.55; 95% CI 0.36–0.73), total mortality or HF hospitalization (HR: 0.56; 95% CI 0.34–0.79), and total mortality or hospitalization for MACEs (HR: 0.61; 95% CI 0.40–0.82) were lower after CRT‐D than after CRT‐P.3 Conclusion
Upgrading from pacemakers to CRT was associated with a similar long‐term risk of mortality and morbidity to de novo CRT. After upgrade, CRT‐D was associated with a lower mortality than CRT‐P. 相似文献104.
105.
Sinéad M. Murphy MB BCh MRCPI Araya Puwanant MD the Consortium for Clinical Investigations of Neurological Channelopathies Inherited Neuropathies Consortium Consortia of the Rare Disease Clinical Research Network 《Annals of neurology》2012,72(4):481-490
Since the introduction of the Orphan Drug Act in 1983, designed to promote development of treatments for rare diseases, at least 378 orphan drugs have been approved. Incentives include financial support, tax credits, and perhaps most importantly, extended market exclusivity. These incentives have encouraged industry interest and accelerated research on rare diseases, allowing patients with orphan diseases access to treatments. However, extended market exclusivity has been associated with unacceptably high drug costs, both for newly developed drugs and for drugs that were previously widely available. We suggest that a paradoxical effect of orphan product exclusivity can be reduced patient access to existing drugs. In addition, the costs of each new drug are arguably unsustainable for patients and for the American health care system. Of all the specialties, neurology has the third highest number of orphan product designations, and neurological diseases account for at least one‐fifth of rare diseases. Citing the use of tetrabenazine for chorea in Huntington disease, adrenocorticotropic hormone for infantile spasms, and enzyme replacement therapy with alglucosidase alpha for Pompe disease, we highlight these paradoxical effects. ANN NEUROL 2012;72:481–490 相似文献
106.
Ralph H. Arnold MB ChB 《Medicine, conflict, and survival》2013,29(4):259-261
This article examines the risk of proliferation of nuclear weapons to several Third World countries, exemplified by recent events in Iraq, and the possibility of rapid acquisition of a nuclear weapons capability in developed countries. It considers the role of the International Atomic Energy Agency and the United Nations in preventing proliferation and calls for wider powers for the latter. The role of the civil nuclear power industry and of reprocessing of nuclear fuel to produce plutonium is stressed, with emphasis on the part played by nuclear power in Japan and the THORP reprocessing plant at Sellafield. 相似文献
107.
108.
109.
M. Johnson
RN PhD L.S. Cowin
RN PhD I. Wilson
MB BS PhD MASSESS&EVAL FRACGP H. Young
PhD 《International nursing review》2012,59(4):562-569
JOHNSON M., COWIN L.S., WILSON I. & YOUNG H. (2012) Professional identity and nursing: contemporary theoretical developments and future research challenges. International Nursing Review Aim: We propose that the conceptual orientation of professional identity is a logical consequence of self‐concept development by focusing on career and its meaning and presents a measurable set of concepts that can be manipulated to improve retention of student and registered nurses within health service. Background: Although professional identity is a term that is commonly written of in nursing literature, its theoretical origins remain unclear, and available empirical evidence of its presence or ability to change is omitted from nursing research. Sources of evidence: We present a professional identity pathway and explore the factors that influence professional identity throughout a career in nursing. Discussion: Nurses' professional identities develop throughout their lifetimes, from before entering nursing education, throughout their years of study and clinical experience, and continue to evolve during their careers. Education is, however, a key period as it is during this time students gain the knowledge and skills that separate nurses as professional healthcare workers from lay people. Conclusion: Finally, a call for longitudinal studies of students to graduates, using conceptually derived and psychometrically proven instruments capable of detecting the subtle changes in the construct over time, is recommended. Further empirical research into the theoretical concepts that underline professional identity, and the factors that influence changes in this important construct in nursing, is required. Ultimately, the practical relevance of such research will lie in the potential it provides for enhanced nursing career support and improved workforce policies. 相似文献
110.
Case report and review of nonischemic spontaneous papillary muscle rupture reports between 2000 and 2015
下载免费PDF全文
![点击此处可从《Echocardiography (Mount Kisco, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Pishoy Gouda MB BCh BAO Lisa Weilovitch MD Ronak Kanani MD Bryan Har MD 《Echocardiography (Mount Kisco, N.Y.)》2017,34(5):786-790
Spontaneous papillary muscle rupture (PMR) is a rare cardiovascular emergency. We present a 63‐year‐old male who presents with acute dyspnea who was found to have an anterior PMR, with no evidence of coronary artery disease, infection, or trauma. A review of cases of nonischemic spontaneous PMR published in 2000–2015 identified 11 additional cases of spontaneous PMR. Posterior and anterior papillary muscles involvement was identified in 54.5% and 45.5% of cases, respectively. Rapid identification due to advances in imaging modalities and improved surgical management has led to optimal outcomes in patients with spontaneous PMR. 相似文献