全文获取类型
收费全文 | 128827篇 |
免费 | 6726篇 |
国内免费 | 675篇 |
专业分类
耳鼻咽喉 | 1709篇 |
儿科学 | 3918篇 |
妇产科学 | 4443篇 |
基础医学 | 18496篇 |
口腔科学 | 4897篇 |
临床医学 | 10431篇 |
内科学 | 27663篇 |
皮肤病学 | 3475篇 |
神经病学 | 12416篇 |
特种医学 | 2785篇 |
外国民族医学 | 1篇 |
外科学 | 11734篇 |
综合类 | 462篇 |
一般理论 | 49篇 |
预防医学 | 12276篇 |
眼科学 | 2753篇 |
药学 | 10125篇 |
中国医学 | 450篇 |
肿瘤学 | 8145篇 |
出版年
2023年 | 1074篇 |
2022年 | 2422篇 |
2021年 | 4025篇 |
2020年 | 2426篇 |
2019年 | 3302篇 |
2018年 | 3871篇 |
2017年 | 2908篇 |
2016年 | 3367篇 |
2015年 | 3724篇 |
2014年 | 4953篇 |
2013年 | 6500篇 |
2012年 | 9712篇 |
2011年 | 10198篇 |
2010年 | 5514篇 |
2009年 | 4497篇 |
2008年 | 7899篇 |
2007年 | 8096篇 |
2006年 | 7605篇 |
2005年 | 7095篇 |
2004年 | 6527篇 |
2003年 | 5883篇 |
2002年 | 5249篇 |
2001年 | 1219篇 |
2000年 | 1048篇 |
1999年 | 1147篇 |
1998年 | 946篇 |
1997年 | 680篇 |
1996年 | 583篇 |
1995年 | 490篇 |
1994年 | 447篇 |
1992年 | 657篇 |
1991年 | 503篇 |
1990年 | 538篇 |
1989年 | 577篇 |
1988年 | 627篇 |
1987年 | 583篇 |
1986年 | 599篇 |
1985年 | 528篇 |
1984年 | 470篇 |
1983年 | 380篇 |
1979年 | 587篇 |
1978年 | 387篇 |
1975年 | 377篇 |
1974年 | 555篇 |
1973年 | 539篇 |
1972年 | 450篇 |
1971年 | 420篇 |
1970年 | 408篇 |
1969年 | 426篇 |
1968年 | 366篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
Lesmana Cosmas Rinaldi Adithya Paramitha Maria Satya Gani Rino A. Lesmana Laurentius A. 《Journal of Medical Ultrasonics》2022,49(3):359-370
Journal of Medical Ultrasonics - Chronic liver disease is still a major problem because disease progression will ultimately lead to liver cirrhosis. Portal hypertension is the hallmark in advanced... 相似文献
2.
Anne-Sophie Worm Fenger Markus Harboe Olsen Maria Louise Fabritius Christian Gunge Riberholt Kirsten Møller 《Acta anaesthesiologica Scandinavica》2023,67(2):240-247
Background
Hyperglycaemia is common in patients with acute brain injury admitted to an intensive care unit (ICU). Many studies have found associations between development of hyperglycaemia and increased mortality in hospitalised patients. However, the optimal target for blood glucose control is unknown. We want to conduct a systematic review with meta-analysis and trial sequential analysis to explore the beneficial and harmful effects of restrictive versus liberal glucose control on patient outcomes in adults with severe acute brain injury.Methods
We will systematically search medical databases including CENTRAL, Embase, MEDLINE and trial registries. We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL, PubMed, EMBASE, Science Citation Index Expanded and CINAHL. Two authors will independently review and select trials and extract data. We will include randomised trials comparing levels of glucose control in our analyses and observational studies will be included to address potential harms. The primary outcomes are defined as all-cause mortality, functional outcome and health-related quality of life. Secondary outcomes include serious adverse events including hypoglycaemia, length of ICU stay and duration of mechanical ventilation, and explorative outcomes including intracranial pressure and infection. Trial Sequential Analysis will be used to investigate the risk of type I error due to repetitive testing and to further explore imprecision. Quality of trials will be evaluated using the Cochrane Risk of Bias tool, and quality of evidence will be assessed using the Grading of Recommendations, Assessment, Development and Evaluations (GRADE) approach.Discussion
The results of the systematic review will be disseminated through peer-reviewed publication. With the review, we hope to inform future randomised clinical trials and improve clinical practice. 相似文献3.
4.
5.
Jakub Pazdrowski Aleksandra Daczak‐Pazdrowska Adriana Polaska Joanna Ka
mierska Wojciech Barczak Mateusz Szewczyk Pawe Golusiski Zygmunt Adamski Ryszard aba Wojciech Golusiski 《Skin research and technology》2019,25(6):857-861
Radiodermatitis is one of the commonest side effects of radiotherapy. They are usually assessed by semi‐quantitative clinical scores, which are not validated and may be subject to inter‐observer variability. A few previous studies suggested that high‐frequency ultrasonography (HF‐USG) is useful in the assessment of the acute phase of radiation dermatitis in breast cancer patients. (a) To monitor skin changes by HF‐USG during the course of radiotherapy due to head and neck cancers, and (b) to determine whether there is any connection between skin sonograms and the skin scoring criteria. This prospective, observational study includes patients diagnosed with head and neck cancers, treated with radiotherapy or concomitant chemoradiation. The final analysis includes six patients. In every patient, the HF‐USG as well as dermatological assessment (target lesion score—TLS and CACE v. 4.0) were performed 4×: before, in the middle, day after, and 3 months after radiotherapy. There were significant differences between non‐irradiated skin thickness and thickness of skin with clinically obvious radiodermatitis (TLS grade 1‐4; P < .0001), as well as between irradiated, unchanged skin thickness (TLS grade 0) and thickness of skin with clinically obvious radiodermatitis (TLS grade 1‐4; P = .0002). There was no significant difference between non‐irradiated and irradiated, unchanged skin thickness (TLS grade 0; P = .9318). In four patients, we demonstrated subepidermal low echogenic band (SLEB). HF‐USG can be useful tool to noninvasive and objective assessment of skin changes during radiotherapy. 相似文献
6.
A case of Rubinstein‐Taybi syndrome associated with growth hormone deficiency in childhood 下载免费PDF全文
7.
8.
Jose M. Morales Jose Angel Martinez-Flores Manuel Serrano Maria José Castro Francisco Javier Alfaro Florencio García Miguel Angel Martínez Amado Andrés Esther González Manuel Praga Estela Paz-Artal Antonio Serrano 《Journal of the American Society of Nephrology : JASN》2015,26(3):735-745
In the current immunosuppressive therapy era, vessel thrombosis is the most common cause of early graft loss after renal transplantation. The prevalence of IgA anti–β2-glycoprotein I antibodies (IgA-aB2GPI-ab) in patients on dialysis is elevated (>30%), and these antibodies correlate with mortality and cardiovascular morbidity. To evaluate the effect of IgA-aB2GPI-ab in patients with transplants, we followed all patients transplanted from 2000 to 2002 in the Hospital 12 de Octubre prospectively for 10 years. Presence of IgA-aB2GPI-ab in pretransplant serum was examined retrospectively. Of 269 patients, 89 patients were positive for IgA-aB2GPI-ab (33%; group 1), and the remaining patients were negative (67%; group 2). Graft loss at 6 months post-transplant was significantly higher in group 1 (10 of 89 versus 3 of 180 patients in group 2; P=0.002). The most frequent cause of graft loss was thrombosis of the vessels, which was observed only in group 1 (8 of 10 versus 0 of 3 patients in group 2; P=0.04). Multivariate analysis showed that the presence of IgA-aB2GPI-ab was an independent risk factor for early graft loss (P=0.04) and delayed graft function (P=0.04). There were no significant differences regarding patient survival between the two groups. Graft survival was similar in both groups after 6 months. In conclusion, patients with pretransplant IgA-aB2GPI-ab have a high risk of early graft loss caused by thrombosis and a high risk of delayed graft function. Therefore, pretransplant IgA-aB2GPI-ab may have a detrimental effect on early clinical outcomes after renal transplantation. 相似文献
9.
Improvement in Tricuspid Annular Plane Systolic Excursion with Pulmonary Hypertension Therapy in Pediatric Patients 下载免费PDF全文
10.