全文获取类型
收费全文 | 14495篇 |
免费 | 990篇 |
国内免费 | 76篇 |
专业分类
耳鼻咽喉 | 134篇 |
儿科学 | 420篇 |
妇产科学 | 299篇 |
基础医学 | 2135篇 |
口腔科学 | 418篇 |
临床医学 | 1204篇 |
内科学 | 3424篇 |
皮肤病学 | 546篇 |
神经病学 | 1321篇 |
特种医学 | 367篇 |
外科学 | 1386篇 |
综合类 | 69篇 |
现状与发展 | 1篇 |
一般理论 | 6篇 |
预防医学 | 1604篇 |
眼科学 | 247篇 |
药学 | 952篇 |
中国医学 | 86篇 |
肿瘤学 | 942篇 |
出版年
2024年 | 12篇 |
2023年 | 175篇 |
2022年 | 308篇 |
2021年 | 588篇 |
2020年 | 321篇 |
2019年 | 519篇 |
2018年 | 647篇 |
2017年 | 393篇 |
2016年 | 389篇 |
2015年 | 461篇 |
2014年 | 637篇 |
2013年 | 778篇 |
2012年 | 1198篇 |
2011年 | 1166篇 |
2010年 | 665篇 |
2009年 | 539篇 |
2008年 | 868篇 |
2007年 | 876篇 |
2006年 | 720篇 |
2005年 | 787篇 |
2004年 | 674篇 |
2003年 | 629篇 |
2002年 | 587篇 |
2001年 | 181篇 |
2000年 | 139篇 |
1999年 | 156篇 |
1998年 | 109篇 |
1997年 | 74篇 |
1996年 | 75篇 |
1995年 | 70篇 |
1994年 | 41篇 |
1993年 | 50篇 |
1992年 | 82篇 |
1991年 | 61篇 |
1990年 | 61篇 |
1989年 | 50篇 |
1988年 | 42篇 |
1987年 | 53篇 |
1986年 | 36篇 |
1985年 | 36篇 |
1984年 | 36篇 |
1983年 | 33篇 |
1982年 | 15篇 |
1981年 | 19篇 |
1979年 | 15篇 |
1978年 | 15篇 |
1977年 | 12篇 |
1974年 | 17篇 |
1970年 | 16篇 |
1968年 | 11篇 |
排序方式: 共有10000条查询结果,搜索用时 12 毫秒
1.
Notfall + Rettungsmedizin - 相似文献
2.
3.
4.
5.
Conall T. Morgan Brigitte Mueller Varsha Thakur Vitor Guerra Callaghan Jull Luc Mertens Mark Friedberg Fraser Golding Mike Seed Steven E.S. Miner Edgar T. Jaeggi Cedric Manlhiot Lynne E. Nield 《The Canadian journal of cardiology》2019,35(4):453-461
Background
The purpose of the study was to evaluate the association between fetal echocardiographic measurements and the need for intervention (primary coarctation repair, staged coarctation repair, or catheter intervention) in prenatally diagnosed coarctation of the aorta.Methods
A single-centre retrospective cohort study (2005-2015) of 107 fetuses diagnosed with suspected coarctation of the aorta in the setting of an apex-forming left ventricle and antegrade flow across the mitral and aortic valves.Results
Median gestational age at diagnosis was 32 weeks (interquartile range, 23-35 weeks). Fifty-six (52%) did not require any neonatal intervention, 51 patients (48%) underwent a biventricular repair. In univariable analysis, an increase in ascending aorta (AAo) peak Doppler flow velocity (odds ratio [OR], 1.40 [95% confidence interval [CI], 1.05-1.91] per 20 cm/s; P = 0.03) was associated with intervention. No intervention was associated with larger isthmus size (OR, 0.23; P < 0.001), transverse arch diameter (OR, 0.23; P < 0.001), and aortic (OR, 0.72; P = 0.02), mitral (OR, 0.58; P = 0.001), and AAo (OR, 0.53; P < 0.001) z-scores. In multivariable analysis, higher peak AAo Doppler (OR, 2.51 [95% CI, 1.54-4.58] per 20 cm/s; P = 0.001) and younger gestational age at diagnosis (OR, 0.81 [95% CI, 0.70-0.93] per week; P = 0.005) were associated with intervention, whereas a higher AAo z-score (OR, 0.65 [95% CI, 0.43-0.94] per z; P = 0.029) and transverse arch dimension (OR, 0.44 [95% CI, 0.18-0.97]; P = 0.05) decreased the risk of intervention.Conclusions
In prenatally suspected coarctation, the variables associated with intervention comprised smaller AAo and transverse arch size, earlier gestational age at diagnosis, and the additional finding of a higher peak AAo Doppler. 相似文献6.
7.
Samira Marín-Romero Teresa Elías-Hernández María Isabel Asensio-Cruz Rocío Ortega-Rivera Raquel Morillo-Guerrero Javier Toral Emilio Montero Verónica Sánchez Elena Arellano José María Sánchez-Díaz Macarena Real-Domínguez Remedios Otero-Candelera Luis Jara-Palomares 《Archivos de bronconeumología》2019,55(12):619-626
IntroductionScales for predicting venous thromboembolism (VTE) recurrence are useful for deciding the duration of the anticoagulant treatment. Although there are several scales, the most appropriate for our setting has not been identified. For this reason, we aimed to validate the DASH prediction score and the Vienna nomogram at 12 months.MethodsThis was a retrospective study of unselected consecutive VTE patients seen between 2006 and 2014. We compared the ability of the DASH score and the Vienna nomogram to predict recurrences of VTE. The validation was performed by stratifying patients as low-risk or high-risk, according to each scale (discrimination) and comparing the observed recurrence with the expected rate (calibration).ResultsOf 353 patients evaluated, 195 were analyzed, with an average age of 53.5 ± 19 years. There were 21 recurrences in 1 year (10.8%, 95% CI: 6.8%-16%). According to the DASH score, 42% were classified as low risk, and the rate of VTE recurrence in this group was 4.9% (95% CI: 1.3%-12%) vs. the high-risk group that was 15% (95% CI: 9%-23%) (p <.05). According to the Vienna nomogram, 30% were classified as low risk, and the rate of VTE recurrence in the low risk group vs. the high risk group was 4.2% (95% CI:0.5%-14%) vs. 16.2% (95% CI: 9.9%-24.4%) (p <.05).ConclusionsOur study validates the DASH score and the Vienna nomogram in our population. The DASH prediction score may be the most advisable, both because of its simplicity and its ability to identify more low-risk patients than the Vienna nomogram (42% vs. 30%). 相似文献
8.
9.
Miguel A. Sanz Pau Montesinos Haesook T. Kim Guillermo J. Ruiz-Argüelles María S. Undurraga María R. Uriarte Lem Martínez Rafael H. Jacomo Homero Gutiérrez-Aguirre Raul A. M. Melo Rosane Bittencourt Ricardo Pasquini Katia Pagnano Evandro M. Fagundes Edo Vellenga Alexandra Holowiecka Ana J. González-Huerta Pascual Fernández Javier De la Serna Salut Brunet Elena De Lisa José González-Campos José M. Ribera Isabel Krsnik Arnold Ganser Nancy Berliner Raul C. Ribeiro Francesco Lo-Coco Bob L?wenberg Eduardo M. Rego 《Annals of hematology》2015,94(8):1347-1356
10.