首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   5985篇
  免费   455篇
  国内免费   116篇
耳鼻咽喉   80篇
儿科学   179篇
妇产科学   37篇
基础医学   458篇
口腔科学   46篇
临床医学   699篇
内科学   1650篇
皮肤病学   54篇
神经病学   374篇
特种医学   85篇
外科学   311篇
综合类   889篇
预防医学   117篇
眼科学   54篇
药学   268篇
中国医学   701篇
肿瘤学   554篇
  2024年   13篇
  2023年   85篇
  2022年   144篇
  2021年   230篇
  2020年   256篇
  2019年   192篇
  2018年   211篇
  2017年   193篇
  2016年   192篇
  2015年   197篇
  2014年   380篇
  2013年   448篇
  2012年   320篇
  2011年   470篇
  2010年   296篇
  2009年   271篇
  2008年   304篇
  2007年   305篇
  2006年   272篇
  2005年   267篇
  2004年   186篇
  2003年   184篇
  2002年   152篇
  2001年   136篇
  2000年   88篇
  1999年   101篇
  1998年   89篇
  1997年   68篇
  1996年   57篇
  1995年   69篇
  1994年   52篇
  1993年   46篇
  1992年   36篇
  1991年   28篇
  1990年   23篇
  1989年   20篇
  1988年   28篇
  1987年   20篇
  1986年   13篇
  1985年   25篇
  1984年   16篇
  1983年   11篇
  1982年   10篇
  1981年   7篇
  1980年   13篇
  1979年   13篇
  1978年   6篇
  1977年   2篇
  1976年   5篇
  1973年   3篇
排序方式: 共有6556条查询结果,搜索用时 0 毫秒
71.
AIMS: To explore variations in invasive care of the elderly with acute coronary syndromes across international practice. METHODS AND RESULTS: Using combined populations from the SYMPHONY and 2nd SYMPHONY trials, we describe 30-day cardiac catheterization in elderly (> or = 75 years; n = 1794) vs. younger patients (< 75 years; n = 14,043) after multivariable adjustment and by region of enrolment. The use of cardiac catheterization and revascularization were not protocol-specified. Elderly patients (median age 78 years) were more often female and more frequently had hypertension, diabetes, prior myocardial infarction, and prior coronary bypass surgery. Overall, they underwent less cardiac catheterization than younger patients [53 vs. 63%; adjusted OR 0.53 (0.46, 0.60)]. The absolute rate of cardiac catheterization in the elderly varied from 77% (vs. 91% in younger patients) in the US cohort to 27% (vs. 41% in younger patients) in the non-US cohort. Revascularization of elderly who underwent cardiac catheterization was also higher in US than non-US cohorts (71.3 vs. 53.6%). There was a significant interaction between the patient age and the use of catheterization across US and non-US regions of enrolment, as well as differences in the predictors of catheterization in the elderly. Despite these findings, after adjustment, 90-day rates of death and death or myocardial infarction (MI) were not significantly different in elderly who underwent catheterization compared with those who did not. CONCLUSION: Although older age is universally predictive of lower use of cardiac catheterization, marked variation in catheterization of the elderly exists across international practice. Demonstrated differences in patterns of use suggest a lack of consensus regarding optimal use of an invasive strategy in the elderly.  相似文献   
72.
73.
74.
Inclusion body myositis is a rare sporadic inflammatory‐degenerative myopathy of the elderly. Despite being the commonest type of acquired myopathy after the age of 50, misdiagnosis is extremely common. The most frequent hurdle in identifying new cases is the wrong diagnosis of polymyositis or motor neuron disease. Novel insights into pathogenic mechanisms have heralded the quest for newer therapeutics as well as drug repurposing in this otherwise progressive disorder.  相似文献   
75.
76.
AimTo validate the global registry of acute coronary events (GRACE) score in acute coronary syndromes (ACS) patients and study its angiographic correlation.Methods and resultsTwo-hundred and thirty-five ACS patients were studied for the combined endpoint of all-cause in-hospital mortality and non-fatal infarction/reinfarction. We tested the predictive accuracy of the composite GRACE score using the receiver operating characteristics (ROC) curve.Lower systolic blood pressure (SBP) (odds ratio [OR] 7.93, P=0.005), ST-segment deviation (OR 7.79, P=0.02) and cardiac biomarker positivity (OR > 6.52, P=0.01) were significantly associated with events. Serum creatinine > 1.4 mg/dL showed a trend towards statistical significance (OR 4.14, P=0.05), whereas age > 50 years (OR 3.62, P=not significant [NS]) and Killips class 4 (OR 2.71, P=NS) showed good association. The best value for predicting events was a GRACE score of > 217 and these patients were more likely to have double/triple vessel disease (P = 0.0009). The C statistic for the GRACE score was 0.75.ConclusionHigher GRACE score predicts in-hospital events and more severe angiographic coronary artery disease (CAD).  相似文献   
77.
Our knowledge about inherited susceptibility to adrenocortical carcinoma (ACC) almost exclusively stems from experiences with familial cancer susceptibility syndromes, which are caused by single gene mutations (e.g. Li-Fraumeni syndrome (LFS)). Population-based studies are largely unavailable. ACC diagnosed during childhood is known to be commonly part of hereditary cancer syndromes. Childhood ACC is part of the classical tumor spectrum of LFS and Beckwith-Wiedemann syndrome (BWS). In adults ACC has been reported in patients with multiple endocrine neoplasia (MEN1), familial adenomatous polyposis coli (FAP) and neurofibromatosis type 1 (NF1). However, the evidence associating ACC with these syndromes is less well substantiated. Here, we will review the evidence for genetic predisposition in general and the association with known familial cancer susceptibility syndromes in particular. We will also review current recommendations regarding screening and surveillance of these patients as they apply to a specialized ACC or endocrine cancer clinic.  相似文献   
78.

Background

Reductions in transfusion requirements/improvements in hematologic parameters have been associated with iron chelation therapy in transfusion-dependent patients, including those with myelodysplastic syndromes; data on there reductions/improvements have been limited to case reports and small studies.

Design and Methods

To explore this observation in a large population of patients, we report a post-hoc analysis evaluating hematologic response to deferasirox in a cohort of iron-overloaded patients with myelodysplastic syndromes enrolled in the Evaluation of Patients’ Iron Chelation with Exjade® (EPIC) study using International Working Group 2006 criteria.

Results

Two-hundred and forty-seven, 100 and 50 patients without concomitant medication for myelodysplastic syndromes were eligible for analysis of erythroid, platelet and neutrophil responses, respectively. Erythroid, platelet and neutrophil responses were observed in 21.5% (53/247), 13.0% (13/100) and 22.0% (11/50) of the patients after a median of 109, 169 and 226 days, respectively. Median serum ferritin reductions were greater in hematologic responders compared with non-responders at end of study, although these differences were not statistically significant. A reduction in labile plasma iron to less than 0.4 μmol/L was observed from week 12 onwards; this change did not differ between hematologic responders and non-responders.

Conclusions

This analysis suggests that deferasirox treatment for up to 1 year could lead to improvement in hematologic parameters in some patients with myelodysplastic syndromes.  相似文献   
79.
80.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号