全文获取类型
收费全文 | 159375篇 |
免费 | 33427篇 |
国内免费 | 2405篇 |
专业分类
耳鼻咽喉 | 5295篇 |
儿科学 | 5623篇 |
妇产科学 | 2665篇 |
基础医学 | 4385篇 |
口腔科学 | 1725篇 |
临床医学 | 27899篇 |
内科学 | 48991篇 |
皮肤病学 | 7528篇 |
神经病学 | 15547篇 |
特种医学 | 6989篇 |
外国民族医学 | 2篇 |
外科学 | 42184篇 |
综合类 | 600篇 |
现状与发展 | 72篇 |
一般理论 | 8篇 |
预防医学 | 8234篇 |
眼科学 | 3477篇 |
药学 | 1637篇 |
中国医学 | 13篇 |
肿瘤学 | 12333篇 |
出版年
2024年 | 514篇 |
2023年 | 4809篇 |
2022年 | 1235篇 |
2021年 | 3192篇 |
2020年 | 6107篇 |
2019年 | 2299篇 |
2018年 | 7531篇 |
2017年 | 7446篇 |
2016年 | 8507篇 |
2015年 | 8506篇 |
2014年 | 15698篇 |
2013年 | 15916篇 |
2012年 | 5865篇 |
2011年 | 5904篇 |
2010年 | 10553篇 |
2009年 | 14413篇 |
2008年 | 6103篇 |
2007年 | 4420篇 |
2006年 | 6860篇 |
2005年 | 4157篇 |
2004年 | 3372篇 |
2003年 | 2348篇 |
2002年 | 2428篇 |
2001年 | 4185篇 |
2000年 | 3381篇 |
1999年 | 3512篇 |
1998年 | 3752篇 |
1997年 | 3543篇 |
1996年 | 3452篇 |
1995年 | 3332篇 |
1994年 | 2026篇 |
1993年 | 1657篇 |
1992年 | 1675篇 |
1991年 | 1665篇 |
1990年 | 1313篇 |
1989年 | 1439篇 |
1988年 | 1215篇 |
1987年 | 1041篇 |
1986年 | 1083篇 |
1985年 | 923篇 |
1984年 | 706篇 |
1983年 | 644篇 |
1982年 | 614篇 |
1981年 | 492篇 |
1980年 | 439篇 |
1979年 | 501篇 |
1978年 | 474篇 |
1977年 | 500篇 |
1975年 | 369篇 |
1972年 | 395篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.
Purpose
Chest wall pain is an uncommon but bothersome late complication following lung stereotactic body radiation therapy. Despite numerous studies investigating predictors of chest wall pain, no clear consensus has been established for a chest wall constraint. The aim of our study was to investigate factors related to chest wall pain in a homogeneous group of patients treated at our institution.Patients and methods
All 122 patients were treated with the same stereotactic body radiation therapy regimen of 48 Gy in three fractions, seen for at least 6 months of follow-up, and planned with heterogeneity correction. Chest wall pain was scored according to the Common Terminology Criteria for Adverse Events classification v3.0. Patient (age, sex, diabetes, osteoporosis), tumour (planning target volume, volume of the overlapping region between planning target volume and chest wall) and chest wall dosimetric parameters (volumes receiving at least 30, 40, and 50 Gy, the minimal doses received by the highest irradiated 1, 2, and 5 cm3, and maximum dose) were collected. The correlation between chest wall pain (grade 2 or higher) and the different parameters was evaluated using univariate and multivariate logistic regression.Results
Median follow-up was 18 months (range: 6–56 months). Twelve patients out of 122 developed chest wall pain of any grade (seven with grade 1, three with grade 2 and two with grade 3 pain). In univariate analysis, only the volume receiving 30 Gy or more (P = 0.034) and the volume of the overlapping region between the planning target volume and chest wall (P = 0.038) significantly predicted chest wall pain, but these variables were later proved non-significant in multivariate regression.Conclusion
Our analysis could not find any correlation between the studied parameters and chest wall pain. Considering our present study and the wide range of differing results from the literature, a reasonable conclusion is that a constraint for chest wall pain is yet to be defined. 相似文献33.
34.
35.
36.
Dynamic LVOT Obstruction and Aortic Stenosis in the Same Patient: A Case of Challenging Doppler Hemodynamics
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)
Matthew W. Parker M.D. Francis J. Kiernan M.D. 《Echocardiography (Mount Kisco, N.Y.)》2015,32(6):1030-1032
We present a patient with both dynamic left ventricular outflow tract obstruction and valvular aortic stenosis. The aortic valve was calcified, and velocities and gradients measured by continuous‐wave Doppler met standard criteria for severe aortic stenosis. The increased subvalvular velocities invalidated assumptions of the simplified Bernoulli equation; correction using the longer form of the Bernoulli equation suggested a lower but still significant gradient. The complex shape of the subvalvular spectral Doppler envelope indicated supranormal systolic function and dynamic left ventricular outflow obstruction. Left heart catheterization with an end‐hole catheter was required to determine the subvalvular and valvular components of the obstruction. 相似文献
37.
Jamaal L. Benjamin MD PhD Rebecca Dennis DO Stacy White Jr MD David Munson MD Sudha A. Anupindi MD Maciej Piskunowicz MD Kassa Darge MD PhD Ami Gokli MD Misun Hwang MD 《Journal of ultrasound in medicine》2020,39(5):1031-1036
Bowel diseases of prematurity, including necrotizing enterocolitis, are dreaded ailments of neonates. Early diagnosis is difficult, with clinical and radiographic findings often inconclusive. We present a novel use of contrast-enhanced ultrasound in detection of pediatric bowel disease. Early identification of compromised blood flow or an at-risk bowel can be quantitatively detected and monitored. This ability has implications for guidance of emerging therapies, allowing targeting of inflammation. These findings represent an advancement in detection of bowel disease in neonates. 相似文献
38.
Maaike van Gerwen MD Naomi Alpert MS Raja Flores MD Emanuela Taioli MD PhD 《American journal of industrial medicine》2020,63(2):115-120
The association between asbestos exposure, mainly in occupational settings, and malignant mesothelioma has been well established; this has prompted several countries to establish mesothelioma epidemiologic surveillance programs often at the request of national agencies. This review compares currently existing mesothelioma registries worldwide to develop a concept model for a US real-time case capture mesothelioma registry. Five countries were identified with a mesothelioma specific registry, including Italy, France, UK, Australia, and South Korea. All, except the UK, used interviews to collect exposure data. Linkage with the national death index was available or was in future plans for all registries. The registries have limited information on treatment, quality of life, and other patient-centered outcomes such as symptoms and pain management. To thoroughly collect exposure data, “real-time” enrollment is preferable; to maximize the capture of mesothelioma cases, optimal coverage, and a simplified consent process are needed. 相似文献
39.
40.