全文获取类型
收费全文 | 6077篇 |
免费 | 442篇 |
国内免费 | 57篇 |
专业分类
耳鼻咽喉 | 26篇 |
儿科学 | 133篇 |
妇产科学 | 114篇 |
基础医学 | 943篇 |
口腔科学 | 103篇 |
临床医学 | 580篇 |
内科学 | 1575篇 |
皮肤病学 | 103篇 |
神经病学 | 733篇 |
特种医学 | 157篇 |
外科学 | 504篇 |
综合类 | 14篇 |
一般理论 | 1篇 |
预防医学 | 386篇 |
眼科学 | 65篇 |
药学 | 489篇 |
中国医学 | 13篇 |
肿瘤学 | 637篇 |
出版年
2024年 | 6篇 |
2023年 | 66篇 |
2022年 | 158篇 |
2021年 | 268篇 |
2020年 | 132篇 |
2019年 | 166篇 |
2018年 | 232篇 |
2017年 | 166篇 |
2016年 | 187篇 |
2015年 | 245篇 |
2014年 | 276篇 |
2013年 | 317篇 |
2012年 | 533篇 |
2011年 | 547篇 |
2010年 | 273篇 |
2009年 | 242篇 |
2008年 | 429篇 |
2007年 | 446篇 |
2006年 | 385篇 |
2005年 | 382篇 |
2004年 | 323篇 |
2003年 | 327篇 |
2002年 | 245篇 |
2001年 | 33篇 |
2000年 | 13篇 |
1999年 | 18篇 |
1998年 | 30篇 |
1997年 | 25篇 |
1996年 | 23篇 |
1995年 | 15篇 |
1994年 | 15篇 |
1993年 | 12篇 |
1992年 | 7篇 |
1991年 | 10篇 |
1990年 | 5篇 |
1989年 | 3篇 |
1988年 | 4篇 |
1986年 | 1篇 |
1985年 | 1篇 |
1984年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1971年 | 1篇 |
1970年 | 1篇 |
1969年 | 2篇 |
1918年 | 1篇 |
排序方式: 共有6576条查询结果,搜索用时 15 毫秒
81.
82.
Vittorio Crespi Massimiliano Braga Sandro Beretta Antonio Carolei Angelo Bignamini Simona Sacco 《Neurological sciences》2013,34(7):1083-1086
It is generally assumed that minor stroke (MS) is an ischemic stroke with a short-term, good functional outcome. However, no clear definition of MS exists. Modified Rankin Scale (mRS) and National Institute of Health Stroke Scale (NIHSS) are still the most accredited standards, but scores and timing of the assessment are not homogeneous. As suggested by a qualified sample of Italian neurologists, the index parameter chosen in our analysis was mRS at the time of hospital discharge. The database of the SIRIO study (a large observational study of 2,573 patients with stroke admitted in Italian hospitals in 2005) was used to identify an mRS threshold to define MS. Reference was made to outcome markers such as rate of discharge to home, 1-year disability and 1-year mortality. The rate of discharge progressively decreased with increase in mRS, while the rates of 1-year mortality and disability progressively increased. Our proposal is one of defining a stroke “minor” when the rate of discharge to home is above the SIRIO database overall value and the 1-year mortality and disability is below the respective overall values. This definition is consistent with a score ≤2 on the mRS. 相似文献
83.
G Bajraktari M Miccoli S Buralli P Fontanive S Elezi MR Metelli A Baggiani FL Dini 《European Journal of Internal Medicine》2012,23(7):616-620
ObjectiveAssessment of plasma matrix metalloproteinase-9 (MMP-9) and Doppler markers of increased left ventricular (LV) filling pressure may be added to risk stratify patients with ischemic cardiomyopathy (IC). Therefore, we aimed at investigating the value of plasma MMP-9 and restrictive filling pattern (RFP) in IC patients.MethodsEighty-eight consecutive patients hospitalized for heart failure (LV ejection fraction ≤ 40%) due to IC were enrolled. A complete M-mode and two-dimensional echo-Doppler examination were performed. Patients were defined as having RFP if they had a mitral E wave deceleration time < 150 ms. Plasma MMP-9 and N-terminal protype-B natriuretic peptide levels were assessed at the time of the index echocardiogram. The end point was all-cause mortality or hospitalization for worsening HF. Follow-up period was 25 ± 17 months.ResultsMedian value of MMP-9 was 714 ng/ml. On univariate analysis, a number of measurements predicted the composite end point: NYHA class > 2, RFP, MMP-9 > 60.5 ng/ml, LV ejection fraction < 27%, anemia, pulmonary pressure ≥ 35 mm Hg, N-terminal protype-B natriuretic peptide > 1742 pg/ml, and glomerular filtration rate < 60 ml/min/1.73 m2. Independent variables of outcome were anemia (HR = 1.9, p = 0.031), and the combination of plasma MMP-9 and RFP (HR = 3.2, p = 0.004). On Kaplan–Meier survival curves, patients with elevated MMP-9 levels and RFP had the lowest event-free survival rate (log-rank: 29.0, p < 0.0001). The net reclassification improvement showed a significant increase in the prediction model when elevated MMP-9 and RFP were added to the base model that included clinical, biochemical and echocardiographic parameters (p < 0.0001).ConclusionMMP-9 levels and RFP have an incremental predictive value to risk classify IC patients. 相似文献
84.
Jansa P Becvar R Ambroz D Palecek T Tomcik M Skacelova S Aschermann M Linhart A 《Clinical rheumatology》2012,31(3):557-561
Background
Systemic sclerosis (SSc) is an important cause of pulmonary arterial hypertension (PAH), with an estimated prevalence of 7.85–26.7%. 相似文献85.
The impact of overt hepatic encephalopathy on health-related quality of life is well defined, but it remains to be demonstrated how much the presence of minimal hepatic encephalopathy (MHE) might impair patients' perceived health status. MHE reduces cognitive abilities, with specific impairment in manual abilities, which can lead to a depressed mood that impairs perceived health status. Therefore, all subjects with cirrhosis should be systematically screened for MHE by validated tools. Early detection and treatment is mandatory to improve the quality of life of patients with advanced cirrhosis, their social isolation, and their daily lives. 相似文献
86.
87.
88.
89.
90.
Eve Khlyavich Freidl Robyn Sysko Michael J. Devlin Jeffrey L. Zitsman Simona C. Kaplan B.Timothy Walsh 《Surgery for obesity and related diseases》2013,9(6):991-996
BackgroundPrior studies have reported that students with overweight and obesity have impairments in performance IQ and executive function and worse school functioning in comparison with peers of normal weight. The present study assessed school and cognitive functioning in a sample of adolescents with severe obesity being evaluated for laparoscopic adjustable gastric banding.MethodsEligible candidates for bariatric surgery were referred for psychiatric evaluation, which included a semistructured clinical interview measuring school functioning and the vocabulary and matrix reasoning subtests of the Wechsler Abbreviated Scale of Intelligence (WASI).ResultsSelf-reported school problems were common, with 55.5% of adolescents failing a grade or subject, 38.7% attending summer school, and 17.8% failing a citywide examination. A significant relationship was observed between body mass index, estimated WASI IQ (r = ?.250; P = .005), and the vocabulary subtest (r = ?.241; P = .006), but not matrix reasoning (r = ?.126; P = NS).ConclusionEven among a sample of adolescents with severe obesity, increased body mass index was associated with lower WASI IQ and vocabulary subtest scores. Increasing awareness of potential cognitive and school problems in bariatric candidates among teachers, school counselors, and other mental health providers is an important first step to improving academic support and educational systems deficiencies for students with overweight and obesity. 相似文献