全文获取类型
收费全文 | 13727篇 |
免费 | 986篇 |
国内免费 | 28篇 |
专业分类
耳鼻咽喉 | 194篇 |
儿科学 | 471篇 |
妇产科学 | 413篇 |
基础医学 | 1659篇 |
口腔科学 | 317篇 |
临床医学 | 1026篇 |
内科学 | 2902篇 |
皮肤病学 | 291篇 |
神经病学 | 1025篇 |
特种医学 | 662篇 |
外科学 | 2386篇 |
综合类 | 124篇 |
一般理论 | 8篇 |
预防医学 | 1163篇 |
眼科学 | 682篇 |
药学 | 557篇 |
中国医学 | 33篇 |
肿瘤学 | 828篇 |
出版年
2022年 | 90篇 |
2021年 | 265篇 |
2020年 | 141篇 |
2019年 | 247篇 |
2018年 | 337篇 |
2017年 | 237篇 |
2016年 | 249篇 |
2015年 | 270篇 |
2014年 | 375篇 |
2013年 | 532篇 |
2012年 | 692篇 |
2011年 | 773篇 |
2010年 | 464篇 |
2009年 | 435篇 |
2008年 | 715篇 |
2007年 | 682篇 |
2006年 | 683篇 |
2005年 | 648篇 |
2004年 | 582篇 |
2003年 | 594篇 |
2002年 | 511篇 |
2001年 | 347篇 |
2000年 | 371篇 |
1999年 | 376篇 |
1998年 | 123篇 |
1997年 | 117篇 |
1996年 | 99篇 |
1995年 | 87篇 |
1994年 | 77篇 |
1993年 | 85篇 |
1992年 | 231篇 |
1991年 | 227篇 |
1990年 | 254篇 |
1989年 | 250篇 |
1988年 | 207篇 |
1987年 | 223篇 |
1986年 | 203篇 |
1985年 | 200篇 |
1984年 | 182篇 |
1983年 | 149篇 |
1982年 | 74篇 |
1980年 | 77篇 |
1979年 | 116篇 |
1978年 | 108篇 |
1977年 | 85篇 |
1976年 | 94篇 |
1975年 | 77篇 |
1974年 | 97篇 |
1973年 | 92篇 |
1971年 | 86篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
L.F. Mejía J.C. Gil M. Jaramillo 《Archivos de la Sociedad Espa?ola de Oftalmología》2019,94(7):331-336
ObjectiveTo propose the Intense Pulsed Light (IPL) therapy as a helpful supplementary treatment in patients with dry eye disease.Material and methodsRetrospective cross sectional design. Medical records of patients in whom dry eye disease symptoms were not satisfactorily controlled with medical therapy alone and who underwent additional IPL with at least three sessions completed. Data were analyzed before therapy and 3 weeks after its completion to asses improvement. Determination of symptoms, through a visual analog scale; tear film stability, through tear Break Up Time (tBUT); measurement of tear secretion, through Schirmer Test; and ocular surface staining with Van Bijsterveld score were evaluated. SPSS software and nonparametric analysis of repeated measures were used. The study was approved by the ethics committee.Results50 eyes from 25 subjects were reviewed. There were 9 males (36%) and 16 females (64%), with a median age of 59 years (IQR 52-64). The median of the symptoms scale was 8 (IQR 8-9) and 3 (IQR 2-4) before and after the therapy respectively (P < .05). The median of BUT was 4 (IQR 3-5) and 10 (IQR 8-11), Schirmer test was 13 (IQR 12-15) and 15 (IQR 13-20), and Van Bijsterveld score was 3 (RIC 3-4) and 2 (IQR 2-3) before and after the therapy respectively (P < .05, for all measurements).ConclusionIPL treatment has excellent results regarding both: dry eye disease symptoms improvement and in office objective tests such as tBUT, Schirmer test and Van Bijsterveld score; IPL could be considered as an effective adjunct for dry eye disease. 相似文献
6.
7.
Will Kaufman Augustine S Chavez Betty Skipper Arthur Kaufman 《International journal for equity in health》2006,5(1):6-5
Background
A public hospital in New Mexico required collection of 50% of estimated costs prior to elective surgeries for self-pay patients. This study assesses the impact of this policy on access to elective surgical procedures. 相似文献8.
Gil Bolotin Frederik H. van der Veen Roberto Lorusso Tamir Wolf Robert Sachner Rona Shofti Jan J. Shreuder Gideon Uretzky 《European journal of cardio-thoracic surgery》2002,21(6):975-980
Objective: Descending and ascending aortomyoplasty are two surgical procedures intended to induce hemodynamic benefits similar to those of the intra-aortic-balloon-pump (IABP). To date, there have been no studies comparing the two surgical techniques. The objective of this study was to compare coronary blood flow augmentation and afterload reduction as produced by descending and ascending aortomyoplasty counterpulsation Methods: Twenty-two mongrel dogs (18–35 kg) underwent IABP application (n=7), descending (n=8), or ascending (n=7) aortomyoplasty. Left anterior descending (LAD) coronary artery blood flow was measured using a Transonic Doppler flow probe. Left ventricular pressure as well as aortic pressures proximal and distal to either the aortomyoplasty site or the IABP position were monitored continuously. Results: Descending aortomyoplasty induced higher elevation in the LAD blood flow during assisted beats (27% from 10.8±4 to 13.8±6 ml/min, P<0.001) than that induced by either ascending aortomyoplasty (19% from 11.7±5 to 14±5 ml/min, P<0.001) or IABP counterpulsation (18% from 8.6±3 to 10.2±4 ml/min, P<0.001). Conversely, while ascending aortomyoplasty reduced the left ventricular end-diastolic pressure by 16% (from 60±18 to 50±22 mmHg, P<0.001), similar to the 16% after load reduction achieved by the IABP counterpulsation, descending aortomyoplasty failed to induce afterload reduction. Conclusions: Descending aortomyoplasty produces higher coronary blood flow augmentation than either ascending aortomyoplasty or IABP. However, afterload reduction comparable to that achieved by IABP was observed only with ascending aortomyoplasty and not with descending aortomyoplasty. 相似文献
9.
New technology has allowed the creation of single catheters with up to four separate luminal channels for access to the central venous system. Since cancer chemotherapy may be associated with local complications specifically related to the mode of intravenous administration, temporary central venous access with a multiple lumen catheter (MLC) offers distinct theoretical advantages over previously used peripheral venous sites. As part of a prospective study to evaluate the clinical efficacy of MLC, the authors have separately studied the usefulness of these catheters in providing venous access to patients receiving chemotherapy. 相似文献
10.
Antonio Rivera Antonio Yáñez Gloria León-Tello Constantino Gil Silvia Giono Eduardo Barba Lilia Cedillo 《BMC musculoskeletal disorders》2002,3(1):15-7