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   18952篇
  免费   861篇
  国内免费   164篇
耳鼻咽喉   74篇
儿科学   245篇
妇产科学   258篇
基础医学   2357篇
口腔科学   58篇
临床医学   2187篇
内科学   1505篇
皮肤病学   104篇
神经病学   5694篇
特种医学   130篇
外科学   625篇
综合类   2411篇
预防医学   1518篇
眼科学   34篇
药学   1787篇
  6篇
中国医学   798篇
肿瘤学   186篇
  2024年   16篇
  2023年   269篇
  2022年   516篇
  2021年   759篇
  2020年   741篇
  2019年   554篇
  2018年   594篇
  2017年   675篇
  2016年   691篇
  2015年   656篇
  2014年   1556篇
  2013年   1660篇
  2012年   1235篇
  2011年   1656篇
  2010年   1088篇
  2009年   1093篇
  2008年   1048篇
  2007年   892篇
  2006年   707篇
  2005年   565篇
  2004年   478篇
  2003年   400篇
  2002年   308篇
  2001年   202篇
  2000年   163篇
  1999年   118篇
  1998年   99篇
  1997年   142篇
  1996年   92篇
  1995年   103篇
  1994年   105篇
  1993年   82篇
  1992年   49篇
  1991年   44篇
  1990年   48篇
  1989年   34篇
  1988年   48篇
  1987年   32篇
  1986年   29篇
  1985年   81篇
  1984年   62篇
  1983年   30篇
  1982年   37篇
  1981年   32篇
  1980年   19篇
  1979年   30篇
  1978年   23篇
  1976年   20篇
  1975年   18篇
  1974年   23篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
AimsIdentify the predective echocardiographic parameters of major cardiovascular events (death, ischemic recurrence, heart failure and rehospitalization) in-hospital and after six months of follow-up and to establish an echocardiographic prognostic score and to evaluate its prognostic value alone or in association with clinical risk scores.MethodsWe recruited 302 patients in intensive care unit of cardiology for ACS consecutively on admission, patients were assessed by clinical risk scores (GRACE, TIMI, CRUSADE) and resting doppler echocardiography, a follow-up of six months.ResultsThe echocardiographic risk score has four variables: LV-EF (RR = 0.931; 95%CI = 0.885–0.979, P < 0.01), RV-AF (RR = 0.951; 95%CI = 0.903–0.999, P < 0.05), iMAE-M-strain (RR = 1.226; 95%CI = 1.081–1.390, P < 0.01) and ULCs (RR = 1.151; 95%CI = 1.081–1.224, P < 0.01). Its discrimination capacity (AUC = 0.85), greater than that of the clinical risk scores, (GRACE: AUC = 0.72, TIMI: AUC = 0.71 and CRUSADE: AUC = 0.76).DiscussionThe risk stratification can be achieved using echocardiographic score easy to acquire and interpret in the clinical setting, with a stratification power higher than the clinical risk scores. The iconoclinical model makes it possible to select a group of heterogeneous patients by their clinical presentations and iconographic data at high risk but with an echoscore or clinical score weak or intermediate.ConclusionThe developed echocardiographic model could prove very useful in the decision-making process and optimization of the therapeutic strategy in some high-risk patients with acute coronary syndromes following an invasive strategy. It is appropriate for expert interpretation, yet relatively simple because it contains only four simple echocardiographic variables as predictors.  相似文献   
22.
23.
Chronic kidney disease (CKD) is one of the most common complications of type 2 diabetes mellitus (T2DM). Furthermore, CKD confers a considerable increase in the risk of cardiovascular (CV) morbidity and mortality. In line with the need to improve knowledge in this field, this article aims to describe the renal endpoints used in the different cardiovascular outcome trials (CVOTs). The objective is to better know the renal variables used in the different CVOTs in order to optimize the implementation of advances in the prevention of progressive diabetic kidney disease in patients with T2DM in clinical practice.  相似文献   
24.
ObjectiveCambodian Americans have complex, interrelated and persistent medical and mental health problems stemming from genocide and the social determinants of health. We examined changes in multiple domains of self-reported health outcomes from a diabetes prevention trial. Methods: Cambodian Americans with depression and high risk for diabetes (n = 188) were randomized to one of three community health worker interventions: lifestyle vs lifestyle plus medication therapy management vs social services. Assessments were at baseline, 12- and 15-months. Results: The typical participant was 55 years old, female, earned below $20,000 annually, and had 7 years of education. About one-third were taking antidepressant medication and over half had elevated depressive symptoms. Relative to social services, lifestyle and lifestyle plus medication therapy management were both similarly effective at increasing diabetes knowledge, nutrition habits, sleep quality and decreasing pain; 2) lifestyle alone was superior to social services for self-reported health; and, 3) all three groups showed improved anxiety and insomnia. There were no effects on physical activity or physical functioning. Conclusion: Community health worker interventions have multiple benefits beyond delaying diabetes. Practice Implications: Health promotion programs that are designed and delivered appropriately can impact even hard to reach and hard to treat groups.  相似文献   
25.
26.
《Vaccine》2022,40(23):3236-3243
BackgroundInfections can have a significant impact on morbidity and mortality in multiple sclerosis (MS) patients. Therefore, vaccinations are of immense importance. If vaccination willingness is to be increased, possible influencing factors should be identified. The aim of the present study was to investigate the status of active immunisation in MS patients in association with sociodemographic, clinical-neurological, psychopathological and personality variables using the NEO-Five Factor Inventory, the Temperament and Character Inventory-Revised and the Hospital Anxiety and Depression Scale.MethodFour hundred and four MS patients from two German neurological hospitals were examined for their vaccination attitudes, in detail, the general willingness to vaccinate and the current vaccination status of mumps, measles and rubella (MMR) as well as tetanus and influenza. We also looked at the current level of disability in relation to the current vaccination status, as well as possible associated personality and psychopathological variables.ResultsPatients with a complete MMR vaccination status were significantly younger and those with a complete influenza vaccination status were significantly older than those with related incomplete vaccination status. Tetanus vaccination status completeness did not differ depending on age and did not show substantial association with personality scores. However, influenza vaccination completeness was associated with differences in personality and psychopathological variables; extraversion, openness, novelty seeking, harm avoidance and anxiety. A reported general vaccination willingness was significantly correlated with the current completeness of tetanus and influenza vaccinations. Novelty seeking, persistence, extraversion, agreeableness, conscientiousness and neuroticism were found associated with an increased vaccination willingness. Anxiety and depression were not related to general vaccination willingness.ConclusionsNo specific personality trait could be defined on its own in relation to general vaccination willingness or complete vaccination status. Younger patients should be made more aware of influenza vaccination. Reasons for rather low vaccination rates need to be further investigated.  相似文献   
27.
目的:探讨网络受欺负对小学生抑郁的影响及其作用机制。方法:采用网络受欺负问卷、一般自我知觉量表、内隐人格观量表和抑郁量表对453名3-6年级的小学生进行问卷调查。结果:(1)网络受欺负与抑郁显著正相关;(2)在控制性别和年龄后,网络受欺负不仅直接预测儿童抑郁,还通过自尊的中介作用间接预测抑郁;(3)自尊的中介作用受到内隐人格观的调节,相对于人格增长观儿童,倾向于持人格实体观的儿童的自尊对抑郁情绪的预测作用更大。结论:自尊在网络受欺负与儿童抑郁的关系中起部分中介作用,且自尊的中介作用受到内隐人格观的调节。  相似文献   
28.
29.
IntroductionDepression rates in older people worldwide vary from 10% to 15% of community-dwelling older persons. There are two others problems related to depression in old age, namely the high incidence of falls and the so-called fear of falling (FOF), with a prevalence ranging from 20% to 85%; it was initially considered a post-fall syndrome, which later as a fall-independent event.AimsStudy aims to conduct a systematic review and meta-analysis to bridge the existing gap in literature about the association between depressive symptomatology, FOF, use of antidepressant therapy and falls, also identifying a possible effect of the study quality on the outcome.MethodsThe selection of studies was carried out between May 20, 2020, and July 27, 2020 and only observational clinical trials, written in English, with participants aged more or equal to 60 years affected by diagnosis of depression or treatment for depression mentioned both as a clinical diagnosis in older patient, and as a predictor/consequence of falls were included. The systematic review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-Analysis (PRISMA) guidelines for reporting systematic reviews and meta-analysis, and the protocol was recorded in the International Prospective Register of Systematic Reviews (PROSPERO).Results and discussionThe screening process ultimately led to the inclusion of 18 articles. Many of the included studies showed that depressive symptoms caused the subsequent increase in the number of falls. Results from the meta-analysis had no highlighted association between depression and falls, in contrast to other review and meta-analysis works: our work includes a substantial number of studies, with a relatively recent publication date, including patients diagnosed with depression, clearly evaluating the association between depression and falls. Results all seem to confirm the hypothesis of an interdependent association between the presence of FOF and the risk of fall, despite the high percentage of cross-sectional studies prevents inferring on the direction of the association. Therapeutic interventions aimed at decrease rate of falls reducing depressive symptoms and FOF.  相似文献   
30.
Setting and objectiveIn Italy, over the last decades, elderly care has been mostly provided by family members, especially adult offspring, and in particular daughters. This paper investigates the relationship between informal caregiving and mental distress among Italians aged 35–59, with a focus on gender effect and parenthood responsibilities.DataThe dataset is the European Health Interview Survey (EHIS), second wave, year 2015. As far as it is known, the Italian EHIS has not been used for studies on ageing and caregiving.MethodsUsing selected subsamples, a Propensity Score Matching between caregivers and non-caregivers aged 35–59 is implemented, with the aim of measuring the difference in level of depression, if any, between the two groups.ResultsFindings show that women providing their frail relatives with informal care are less likely to suffer from mental distress compared to non-carers. However, results change radically if they have children aged less than 15 at home, and a higher probability of being depressed is detected for women overwhelmed by the double responsibility of assisting both dependent relatives and their own children. Results are not significant for men.  相似文献   
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