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   261107篇
  免费   15101篇
  国内免费   6983篇
耳鼻咽喉   2929篇
儿科学   8620篇
妇产科学   3382篇
基础医学   18408篇
口腔科学   4548篇
临床医学   32573篇
内科学   41561篇
皮肤病学   3350篇
神经病学   11495篇
特种医学   13071篇
外国民族医学   22篇
外科学   34763篇
综合类   31226篇
现状与发展   27篇
一般理论   40篇
预防医学   28620篇
眼科学   4606篇
药学   25621篇
  341篇
中国医学   6432篇
肿瘤学   11556篇
  2023年   2487篇
  2022年   4731篇
  2021年   10405篇
  2020年   7232篇
  2019年   12365篇
  2018年   6992篇
  2017年   6125篇
  2016年   8113篇
  2015年   10985篇
  2014年   21111篇
  2013年   18868篇
  2012年   21983篇
  2011年   19286篇
  2010年   17396篇
  2009年   16421篇
  2008年   15226篇
  2007年   15022篇
  2006年   12774篇
  2005年   8645篇
  2004年   4754篇
  2003年   3964篇
  2002年   3065篇
  2001年   2428篇
  2000年   2160篇
  1999年   1371篇
  1998年   1759篇
  1997年   1546篇
  1996年   1333篇
  1995年   1420篇
  1994年   1277篇
  1993年   961篇
  1992年   1172篇
  1991年   1080篇
  1990年   1132篇
  1989年   1058篇
  1988年   992篇
  1987年   870篇
  1986年   748篇
  1985年   1642篇
  1984年   1799篇
  1983年   1328篇
  1982年   1398篇
  1981年   1384篇
  1980年   1197篇
  1979年   1009篇
  1978年   769篇
  1977年   779篇
  1976年   689篇
  1975年   476篇
  1974年   480篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
IntroductionOur aim was to describe practices in multimodal pain management at US children's hospitals and evaluate the association between non-opioid pain management strategies and pediatric patient-reported outcomes (PROs).MethodsData were collected as part of the 18-hospital ENhanced Recovery In CHildren Undergoing Surgery (ENRICH-US) clinical trial. Non-opioid pain management strategies included use of preoperative and postoperative non-opioid analgesics, regional anesthetic blocks, and a biobehavioral intervention. PROs included perioperative nervousness, pain-related functional disability, health-related quality of life (HRQoL). Associations were analyzed using multinomial logistic regression models.ResultsAmong 186 patients, 62 (33%) received preoperative analgesics, 186 (100%) postoperative analgesics, 81 (44%) regional anesthetic block, and 135 (73%) used a biobehavioral intervention. Patients were less likely to report worsened as compared to stable nervousness following regional anesthetic block (relative risk ratio [RRR]:0.31, 95% confidence interval [CI]:0.11–0.85), use of a biobehavioral technique (RRR:0.26, 95% CI:0.10–0.70), and both in combination (RRR:0.08, 95% CI:0.02–0.34). There were no associations of non-opioid pain control modalities with pain-related functional disability or HRQoL.ConclusionUse of postoperative non-opioid analgesics have been largely adopted, while preoperative non-opioid analgesics and regional anesthetic blocks are used less frequently. Regional anesthetic blocks and biobehavioral interventions may mitigate postoperative nervousness in children.Level of evidenceIII.  相似文献   
2.
《Neuro-Chirurgie》2023,69(3):101420
ObjectiveVagus nerve stimulation (VNS) therapy has been used for more than two decades to treat drug resistant epilepsy and depression and most recently received FDA approval for stroke rehabilitation. Expanding indications will renew the interest in the technique and increase the number of surgeons to be trained. The aim of this study was to survey surgeons with substantial expertise on optimal teaching and training approaches.MethodsAnonymous forms comprising 16 questions were sent by e-mail to surgeons with substantial expertise. Statistical analyses were used to compare the answers of the most experienced surgeons (>5 years) with the less experienced ones (<5 years).ResultsFully-completed forms were collected from 57 experts from 20 countries. The placement of the helical coils was deemed to be the most difficult step by 36 (63.2%) experts, and the use of optical magnification during this step was deemed necessary by 39 (68.4%) experts. Vocal cord palsy should be largely avoidable with proper surgical technique according to 44 (77.2%) experts. The teaching tool considered the most useful was mentoring (38, 66.7%). The future of VNS surgery teaching was deemed to be in anatomical workshops (29, 50.9%) and surgical simulation (26, 45.6%). Overall, answers did not vary significantly according to experience.ConclusionsVNS surgery should be mastered by actively participating in dedicated practical training courses and by individual mentoring during actual surgery, which is still the best way to learn. This study highlights the need for a formal training course and possible specific accreditation.  相似文献   
3.
认知障碍是指记忆、语言、理解和判断等一个或多个方面的功能障碍,包括轻度认知障碍和各种类型的痴呆症。痴呆症是认知障碍最严重的表现,是一种导致患者日常生活、社会交往和工作能力发生显著变化的综合征。阿尔茨海默病(AD)是最常见的痴呆症类型,其次是血管性痴呆(VD)和其他神经退行性痴呆[1]。已知年龄与认知功能的退化密切相关。  相似文献   
4.
In this paper, we argue that understanding and addressing the problem of poor-quality medical products requires a more interdisciplinary approach than has been evident to date. While prospective studies based on rigorous standardized methodologies are the gold standard for measuring the prevalence of poor-quality medical products and understanding their distribution nationally and internationally, they should be complemented by social science research to unpack the complex set of social, economic, and governance factors that underlie these patterns. In the following sections, we discuss specific examples of prospective quality surveys and of social science studies, highlighting the value of cross-sector partnerships in driving high-quality, policy-relevant research in this area.  相似文献   
5.
AimThis integrative review aims to explore the relationship between feedback and evaluative judgement in undergraduate nursing and midwifery education.BackgroundResearch in higher education has shown that feedback practices can lead to students’ developing evaluative judgement; thought critical for performance improvement and life-long learning. While literature in nursing and midwifery education has not yet employed the term ‘evaluative judgement’ explicitly, there might be similar concepts and practices that seek to develop students’ judgement of performance that sustain learning beyond the immediate task.DesignAn integrative review of the nursing and midwifery feedback literature.MethodsIn February 2020, six online databases (CINAHL, ProQuest, Scopus, ERIC, PsycINFO, Ovid MEDLINE) were systematically searched for literature published between January 1989-February 2020. Synonyms for feedback and evaluative judgement were used to inform our search. This review included a rigorous team-based, five-stage approach: (1) identifying the problem; (2) conducting the search; (3) evaluating the data; (4) analysing the data; and (5) presenting the integrative review.ResultsA total of 1408 studies were initially retrieved with 543 duplicates. 865 abstracts were screened using eligibility criteria, resulting in the exclusion of 835 studies. Thirty full-text studies were appraised for quality. Eighteen studies with diverse methodologies achieved a medium-high quality score for inclusion in data analysis. Conceptions of feedback and evaluative judgement were identified in all studies; despite none using the term 'evaluative judgement' explicitly. Thematic analysis of the studies resulted in seven themes: conceptions of feedback, purposes of feedback, sources of feedback, modes of feedback, conceptions of evaluative judgement, purposes of evaluative judgement and relationships between feedback and evaluative judgement.ConclusionsWhile our findings supported contemporary higher education research, the feedback-evaluative judgement relationship is novel in nursing education. We encourage educators to design feedback activities privileging students’ active engagement through dialogic feedback, reflection and self-assessment, to develop their evaluative judgement of practice.  相似文献   
6.
BackgroundSafe pharmaceutical care requires competent nurses with specific knowledge, skills and attitudes. It is unclear whether nursing students are adequately prepared to perform pharmaceutical care in practice. Mapping their pharmaceutical care competences can lead to a better understanding of the extent to which curricula fit expectations of the labour market.ObjectivesTo assess pharmaceutical care competences of final-year nursing students of different educational levels.DesignA cross-sectional survey design.SettingsIn 14 European countries, nursing schools who offer curricula for level 4 to 7 students were approached.ParticipantsThrough convenience sampling 1741 final-year student nurses of level 4 to 7 were included. Sampling strategies were country-specific.MethodsA web-platform was developed with an assessment of the level in which students mastered pharmaceutical care competences. Knowledge questions, case studies (basic/advanced level), self-reported practical skills and attitudes were evaluated.ResultsMean scores for knowledge questions differed significantly (p < 0.001) between level 5 (56/100), level 6 (68/100) and level 7 students (72/100). For basic cases level 5 students reached lower scores (64/100) compared with level 6 (71/100) and level 7 (72/100) students (p = 0.002 and p = 0.005). For more advanced cases no difference between levels was observed (overall mean 61/100). Most students (63–90 %) considered themselves skilled to perform pharmaceutical care and had positive attitudes towards their participation in pharmaceutical care (65–97 %).ConclusionsRelatively low knowledge scores were calculated for final-year student nurses. In some domains, lower levels of students might be insufficiently prepared to take up responsibilities in pharmaceutical care. Our assessment can be used as a tool for educators to evaluate how prepared nursing students are for pharmaceutical care. Its further implementation for students of different educational levels will allow benchmarking between the levels, both within and between countries.  相似文献   
7.
温婷  刘汉娇  易云霞 《全科护理》2022,20(2):199-202
综述女性压力性尿失禁(stress urinary incontinence,SUI)风险预测的研究进展。指出女性SUI风险预测相关文献普遍存在风险预测工具和指标缺乏临床大样本验证,指标、纳入人群不统一的现象,风险预测模型存在构建过程未按报告规范进行,未进行完整的模型验证以及模型性能评价指标不规范的情况。未来研究可以在现有风险预测工具或模型的基础上进行改进、完善,以期为女性SUI风险预测提供参考。  相似文献   
8.
《Vaccine》2022,40(39):5683-5690
The rapid development of innovations and new technologies, the focus on the life-course approach to immunization and equity, and the prevalent hesitancy towards vaccines requires immunization staff to be well-trained and updated regularly in order to deliver quality immunization services to the public. The need for advanced vaccinology training is therefore paramount. In preparation for a second Global Workshop on Advanced Vaccinology Training that took place in March 2022, this paper presents the results of a survey aiming to provide a thorough update of a landscape analysis on advanced vaccinology courses conducted in 2018 and a look at the impact of the COVID-19 crisis. Thirty-three course organizers responded to a survey to provide information on their respective course. Of those, 17 courses are short courses, 11 post-graduate courses and 5 are Master level courses. Most courses are organized on an annual basis. Even though some courses were not sustained overtime, the number of courses has been increasing during the last few years, and at least one vaccinology course is now being offered in each WHO region. Although the training capacity has increased tremendously, the need still exceeds the capacity and many courses have way more applicants than they can select. The most frequent challenges reported included sustainable funding and identifying faculty. The COVID-19 pandemic impacted the delivery of several vaccinology courses, which have been postponed or reformatted to an online or hybrid training event. An e-portal of the global collaboration has been established to facilitate communication between the different courses and to assist future course participants to identify the most suitable course for their needs.  相似文献   
9.
ObjectiveNew-onset postoperative atrial fibrillation (POAF) after cardiac surgery is common, with rates up to 60%. POAF has been associated with early and late stroke, but its association with other cardiovascular outcomes is less known. The objective was to perform a meta-analysis of the studies reporting the association of POAF with perioperative and long-term outcomes in patients with cardiac surgery.MethodsWe performed a systematic review and a meta-analysis of studies that presented outcomes for cardiac surgery on the basis of the presence or absence of POAF. MEDLINE, EMBASE, and the Cochrane Library were assessed; 57 studies (246,340 patients) were selected. Perioperative mortality was the primary outcome. Inverse variance method and random model were performed. Leave-one-out analysis, subgroup analyses, and metaregression were conducted.ResultsPOAF was associated with perioperative mortality (odds ratio [OR], 1.92; 95% confidence interval [CI], 1.58-2.33), perioperative stroke (OR, 2.17; 95% CI, 1.90-2.49), perioperative myocardial infarction (OR, 1.28; 95% CI, 1.06-1.54), perioperative acute renal failure (OR, 2.74; 95% CI, 2.42-3.11), hospital (standardized mean difference, 0.80; 95% CI, 0.53-1.07) and intensive care unit stay (standardized mean difference, 0.55; 95% CI, 0.24-0.86), long-term mortality (incidence rate ratio [IRR], 1.54; 95% CI, 1.40-1.69), long-term stroke (IRR, 1.33; 95% CI, 1.21-1.46), and longstanding persistent atrial fibrillation (IRR, 4.73; 95% CI, 3.36-6.66).ConclusionsThe results suggest that POAF after cardiac surgery is associated with an increased occurrence of most short- and long-term cardiovascular adverse events. However, the causality of this association remains to be established.  相似文献   
10.
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