全文获取类型
收费全文 | 225490篇 |
免费 | 20005篇 |
国内免费 | 4783篇 |
专业分类
耳鼻咽喉 | 3407篇 |
儿科学 | 4483篇 |
妇产科学 | 3954篇 |
基础医学 | 17660篇 |
口腔科学 | 7273篇 |
临床医学 | 21468篇 |
内科学 | 23308篇 |
皮肤病学 | 2448篇 |
神经病学 | 11405篇 |
特种医学 | 6143篇 |
外国民族医学 | 11篇 |
外科学 | 22190篇 |
综合类 | 34995篇 |
现状与发展 | 10篇 |
一般理论 | 24篇 |
预防医学 | 31020篇 |
眼科学 | 2026篇 |
药学 | 22587篇 |
343篇 | |
中国医学 | 26112篇 |
肿瘤学 | 9411篇 |
出版年
2024年 | 966篇 |
2023年 | 4543篇 |
2022年 | 8452篇 |
2021年 | 11159篇 |
2020年 | 10891篇 |
2019年 | 12028篇 |
2018年 | 10734篇 |
2017年 | 9258篇 |
2016年 | 8336篇 |
2015年 | 7775篇 |
2014年 | 15193篇 |
2013年 | 15642篇 |
2012年 | 13617篇 |
2011年 | 14535篇 |
2010年 | 11637篇 |
2009年 | 10138篇 |
2008年 | 9439篇 |
2007年 | 9485篇 |
2006年 | 8097篇 |
2005年 | 6854篇 |
2004年 | 5696篇 |
2003年 | 5061篇 |
2002年 | 3882篇 |
2001年 | 3265篇 |
2000年 | 2929篇 |
1999年 | 2391篇 |
1998年 | 1949篇 |
1997年 | 1763篇 |
1996年 | 1441篇 |
1995年 | 1445篇 |
1994年 | 1237篇 |
1993年 | 1092篇 |
1992年 | 1009篇 |
1991年 | 939篇 |
1990年 | 816篇 |
1989年 | 769篇 |
1988年 | 735篇 |
1987年 | 645篇 |
1986年 | 596篇 |
1985年 | 1856篇 |
1984年 | 2115篇 |
1983年 | 1324篇 |
1982年 | 1740篇 |
1981年 | 1206篇 |
1980年 | 1039篇 |
1979年 | 923篇 |
1978年 | 757篇 |
1977年 | 568篇 |
1976年 | 698篇 |
1975年 | 487篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
181.
肠易激综合征(Irritable bowel syndrome,IBS)是临床常见病、多发病,其治疗方法丰富,但部分患者疗效欠佳,发展成难治性IBS。目前国内外关于针灸治疗难治性IBS的临床随机对照试验尚不多见。本文立足试验方案设计的“PICOS”原则,从研究对象及诊断标准、干预措施、对照措施、结局指标四个方面入手,重点探讨针刺辅助治疗难治性肠易激综合征临床试验设计的关键要点。从选择特色优势病种、明确诊断标准、制定符合临床实际的干预方案、运用符合目标的安慰针刺、结合研究设计和目的选定结局指标几个角度,阐述试验相关环节设计的原因和思考。 相似文献
182.
A. Guerrero Gómez N. González Jaramillo J.A. Castro Pérez 《Revista espa?ola de anestesiología y reanimación》2019,66(1):10-17
Introduction
The fast track / ultra-fast-track protocols are techniques used to optimise the patient care process and a quick recovery after cardiac surgery. They are one of the mainstays of efficient practice. With their use, the length of hospital and intensive care unit (ICU) stays are reduced, with a direct impact on costs and the quality of the health service.Objective
To compare the length of stay in the ICU, length of hospital stay, and post-operative mortality in ultra-fast-track extubated (uFTE) patients and those with conventional extubation (CE) after cardiac surgery.Methods
Longitudinal, analytical, retrospective study was conducted, with the period between the time of surgery and discharge being included as the study period.Results
A total of 396 patients older than 18 years who required cardiac surgery were included, of whom 207 patients had (uFTE) and 189 had CE. Although the groups were not comparable due to the statistical differences found, when performing the multivariate adjustment, uFTE maintained its statistical independence and was associated with lower cardiovascular morbidity, such as myocardial ischaemia (95% CI: 0.37-0.86; P = .01) and lower post-surgical vasopressor requirement (95% CI: 0.18-0.49; P < .01). No significant differences were found in the length of hospital stay, ICU stay, or post-operative mortality in the ICU.Conclusion
Implementing the uFTE strategy, decreases cardiovascular morbidity and vasopressor requirement. The change to uFTE should be accompanied by changes in models and practices in patient recovery to standardised protocols. This study shows that uFTE did not reduce the length of ICU stay, hospital stay, or mortality. 相似文献183.
184.
185.
Fabian M. Laage Gaupp Nadia Solomon Ivan Rukundo Azza A. Naif Erick M. Mbuguje Anish Gonchigar Minzhi Xing John D. Prologo Douglas D. Silin Frank J. Minja 《Journal of vascular and interventional radiology : JVIR》2019,30(12):2036-2040
Despite a population of nearly 60 million, there is currently not a single interventional radiologist in Tanzania. Based on an Interventional Radiology (IR) Readiness Assessment, the key obstacles to establishing IR in Tanzania are the lack of training opportunities and limited availability of disposable equipment. An IR training program was designed and initiated, which relies on US-based volunteer teams of IR physicians, nurses, and technologists to locally train radiology residents, nurses, and technologists. Preliminary results support this strategy for addressing the lack of training opportunities and provide a model for introducing IR to other resource-limited settings. 相似文献
186.
Michelle Linda Ferderbar Thomas E. Doyle Reza Samavi David Koff 《Journal l'Association canadienne des radiologistes》2019,70(2):119-124
Several regulatory bodies have agreed that low-dose radiation used in medical imaging is a weak carcinogen that follows a linear, non-threshold model of cancer risk. While avoiding radiation is the best course of action to mitigate risk, computed tomography (CT) scans are often critical for diagnosis. In addition to the as low as reasonably achievable principle, a more concrete method of dose reduction for common CT imaging exams is the use of a diagnostic reference level (DRL). This paper examines Canada's national DRL values from the recent CT survey and compares it to published provincial DRLs as well as the DRLs in the United Kingdom and the United States of America for the 3 most common CT exams: head, chest, and abdomen/pelvis. Canada compares well on the international scale, but it should consider using more electronic dose monitoring solutions to create a culture of dose optimization. 相似文献
187.
188.
Children with a specific learning disorder (SLD) are often characterized by marked intellectual strengths and weaknesses. In the last few years, research has focused on a common discrepancy between low working memory and processing speed on the one hand, and high verbal and visuoperceptual intelligence on the other. SLD profiles featuring a specific discrepancy between verbal and visuoperceptual abilities have been only marginally considered, however, and their systematic comparison vis-à-vis typically-developing (TD) populations has yet to be conducted. The present study examined a dataset of 1624 WISC-IV profiles of children with a diagnosis of SLD. It emerged that the proportion of children with a Verbal Comprehension Index (VCI) at least 1.5 SD (22 standardized points) lower than their scores on the Perceptual Reasoning Index (PRI) was larger than the proportion of SLD children with the opposite discrepant profile; it was also larger than the same proportion found among TD children. Comparing the two discrepant profiles revealed that the children also differed by type of learning difficulty, gender, and performance in the WISC-IV Symbol search task. Further examination suggested that children who were discrepant and also distinctly poor in visuoperceptual intelligence were particularly slow in general processing. 相似文献
189.
Nyika Machenjedze Macalane J Malindi Fungai Mbengo 《African Journal of AIDS Research》2019,18(1):72-80
Worldwide, researchers routinely study children indirectly through adults who act as proxies for such children. The call for researchers to rather study children directly and adopt less intrusive child-friendly methodologies has become louder. The draw-and-write technique is regarded as a less intrusive child-friendly method of collecting data that can be used for this purpose. This paper reports the findings of a qualitative study that sought to establish the feasibility of the draw-and-write technique in exploring the resilience of children orphaned by AIDS. This study involved a convenience sample of 23 IsiXhosa-speaking orphaned children aged from 13 to 17. The participants were in grades 6 to 10 and they resided in two child and youth care centres in the Eastern Cape province of South Africa. As part of the draw-and-write technique the participants were asked to make drawings of what enabled them to cope with their lives and to write short narratives in which they explained their drawings. Inductive content analysis was used to analyse the data and this process yielded two main themes, namely: personal protective resources and socio-ecological protective resources. The findings show that complex combinations of personal and socio-ecological resilience resources enabled the resilience of the orphaned children. The findings challenge researchers not to be oblivious to alternative child-friendly methods of research such as the draw-and-write technique when young people are the unit of analysis. The findings of this study have implications for research as well as practice in the field of education and psychology. 相似文献
190.
吴洁 《南京中医药大学学报》2019,35(4):376-378
回顾《内经》相关理论,指出痈脓病机关键在于气血凝滞、经络阻塞、脏腑失和,可分期论治。总结《金匮要略》治疗痈脓的方法,认为痈脓应尽早治疗,防邪深入;并根据证情辨证使用清热解毒,活血消散;排除脓毒,泄浊于外等治法。对现代临床仍具实用价值。 相似文献