全文获取类型
收费全文 | 3096篇 |
免费 | 301篇 |
国内免费 | 27篇 |
专业分类
耳鼻咽喉 | 48篇 |
儿科学 | 84篇 |
妇产科学 | 39篇 |
基础医学 | 302篇 |
口腔科学 | 241篇 |
临床医学 | 323篇 |
内科学 | 658篇 |
皮肤病学 | 139篇 |
神经病学 | 171篇 |
特种医学 | 182篇 |
外科学 | 492篇 |
综合类 | 95篇 |
现状与发展 | 30篇 |
预防医学 | 235篇 |
眼科学 | 24篇 |
药学 | 242篇 |
中国医学 | 14篇 |
肿瘤学 | 105篇 |
出版年
2024年 | 14篇 |
2023年 | 190篇 |
2022年 | 38篇 |
2021年 | 76篇 |
2020年 | 116篇 |
2019年 | 78篇 |
2018年 | 109篇 |
2017年 | 96篇 |
2016年 | 102篇 |
2015年 | 100篇 |
2014年 | 149篇 |
2013年 | 164篇 |
2012年 | 174篇 |
2011年 | 186篇 |
2010年 | 156篇 |
2009年 | 147篇 |
2008年 | 147篇 |
2007年 | 172篇 |
2006年 | 117篇 |
2005年 | 99篇 |
2004年 | 85篇 |
2003年 | 77篇 |
2002年 | 58篇 |
2001年 | 61篇 |
2000年 | 62篇 |
1999年 | 73篇 |
1998年 | 44篇 |
1997年 | 57篇 |
1996年 | 48篇 |
1995年 | 39篇 |
1994年 | 39篇 |
1993年 | 38篇 |
1992年 | 23篇 |
1991年 | 24篇 |
1990年 | 22篇 |
1989年 | 35篇 |
1988年 | 26篇 |
1987年 | 26篇 |
1985年 | 18篇 |
1984年 | 8篇 |
1983年 | 9篇 |
1982年 | 11篇 |
1981年 | 12篇 |
1980年 | 17篇 |
1979年 | 9篇 |
1978年 | 10篇 |
1977年 | 8篇 |
1976年 | 13篇 |
1975年 | 12篇 |
1974年 | 8篇 |
排序方式: 共有3424条查询结果,搜索用时 31 毫秒
1.
A mixed‐method study of effects of a therapeutic play intervention for children on parental anxiety and parents' perceptions of the intervention
下载免费PDF全文
![点击此处可从《Journal of advanced nursing》网站下载免费的PDF全文](/ch/ext_images/free.gif)
2.
Hysterosalpingography was performed in 31 patients by means of a low-dose scanning-beam digital radiographic system. The technique permits adequate evaluation of gynecologic abnormalities while allowing significant reduction in radiation: 2.4-mR (6.1 X 10(-7) C/kg) exposure to the skin and 0.7-mrad (7 X 10(-6) Gy) mean dose to the ovaries per image obtained. Sixteen patients demonstrated readily recognizable and documented abnormalities, corroborated by laparoscopy, laparotomy, or other supportive evidence. 相似文献
3.
4.
5.
Renal dysfunction after myocardial revascularization. 总被引:5,自引:0,他引:5
Pedro E Antunes David Prieto J Ferr?o de Oliveira Manuel J Antunes 《European journal of cardio-thoracic surgery》2004,25(4):597-604
OBJECTIVES: In this study, we evaluate the incidence of and analyse the pre and intraoperative risk factors for the development of postoperative renal dysfunction (PRD), and the impact of such an event on perioperative mortality and on hospital length of stay. In addition, we sought to investigate the influence of a mildly increased serum creatinine (1.3-2.0 mg/dl) on perioperative mortality and morbidity. METHODS: The study included 2445 consecutive patients who had no pre-existing renal disease (creatinine or=2.1 mg/dl with a preoperative-to-postoperative increase >or=0.9 mg/dl. Univariate and multivariate analyses were performed where appropriate. RESULTS: Global 30-day mortality was 0.7%. The incidence of PRD was 5.6% (136 patients). Mortality for patients who experienced PRD was 8.8 vs. 0.1% for patients who did not (P<0.001). PRD increased the length of hospital stay by 3.4 days (7.6 vs. 11.0 days; P<0.001), and patients who needed haemodialysis (11%) had a perioperative mortality of 33.3% and a mean hospital length of stay of 16 days. Multivariable logistic regression identified the following variables as independent predictors of PRD: age (P=0.017; odds ratio (OR) 1.3 per 10 years), angina class III/IV (P=0.003; OR 1.7); cardiopulmonary bypass time (P=0.007; OR 1.01 per minute); preoperative serum creatinine levels: group 1 (1.3-1.6 mg/dl (P<0.001; OR 5.5)) and group 2 (1.7-2.0 mg/dl (P<0.001; OR 14.2)). Finally, a mild elevation of the preoperative creatinine level (1.3-2.0 mg/dl) increased significantly the probability of perioperative mortality, low cardiac output, haemodialysis and prolonged hospital stay. CONCLUSIONS: Although the likelihood of PRD in patients without pre-existing renal dysfunction is relatively low, it dramatically increases mortality, morbidity and length of stay after CABG. Mildly elevated (>1.2 mg/dl) preoperative serum creatinine level significantly increases the perioperative mortality and morbidity. 相似文献
6.
7.
8.
9.
Solitary bronchioloalveolar carcinoma: CT criteria 总被引:14,自引:0,他引:14
Kuhlman JE; Fishman EK; Kuhajda FP; Meziane MM; Khouri NF; Zerhouni EA; Siegelman SS 《Radiology》1988,167(2):379-382
The computed tomographic (CT) scans of 30 patients with solitary bronchioloalveolar carcinoma were reviewed. Common features at CT included the peripheral or subpleural location of a pulmonary mass (25 cases), pseudocavitation (18 cases), heterogeneous attenuation (17 cases), irregular margins forming a star pattern (22 cases), and pleural tags (21 cases). Using these CT criteria, four independent observers attempted to identify cases of bronchioloalveolar carcinoma from a larger sample of lung cancers and benign lesions by categorizing a series of test cases into four probability categories. Although the bronchioloalveolar carcinomas were correctly ranked in the two highest probability categories 75% of the time (in 45 of 60 cases), there was considerable overlap with other lung lesions, particularly with adenocarcinoma and large cell undifferentiated carcinoma. However, even though the typical features of bronchioloalveolar carcinoma are not invariable or highly specific, they are characteristic enough to suggest the diagnosis. 相似文献
10.
Early onset prosthetic valve endocarditis is one of the most lethal complications after valve replacement. During the first year of operation of our new cardiac surgical program, we observed 10 cases of prosthetic valve endocarditis, the majority being caused by staphylococci, making an incidence of 10.6%. Subsequent investigations uncovered a very high prevalence of methicillin-resistant strains which led to a radical change in the antibiotic prophylaxis, from a cephalosporin-based protocol to a two drug regime of vancomycin and netilmicin. There were no cases of prosthetic infection among the 138 patients operated on in the one year period following the institution of this protocol. Because there were no other changes, either in the types of prostheses used or the techniques of implantation, the eradication of prosthetic valve endocarditis can be related only to this alteration in the prophylaxis. Therefore, we may conclude that the inter-institutional transfer of protocols is not adequate before a thorough investigation of the prevalent hospital pathogens and their sensitivity to antibiotics is carried out. We have not registered resistances to vancomycin and this drug remains the most important antimicrobial agent, both in the prophylaxis and in the treatment of prosthetic valve endocarditis. 相似文献