收费全文 | 194126篇 |
免费 | 11955篇 |
国内免费 | 1334篇 |
耳鼻咽喉 | 2075篇 |
儿科学 | 6133篇 |
妇产科学 | 4607篇 |
基础医学 | 27132篇 |
口腔科学 | 5941篇 |
临床医学 | 16749篇 |
内科学 | 43030篇 |
皮肤病学 | 4552篇 |
神经病学 | 18604篇 |
特种医学 | 5936篇 |
外国民族医学 | 24篇 |
外科学 | 22103篇 |
综合类 | 2028篇 |
一般理论 | 95篇 |
预防医学 | 15718篇 |
眼科学 | 3146篇 |
药学 | 14755篇 |
3篇 | |
中国医学 | 911篇 |
肿瘤学 | 13873篇 |
2023年 | 1351篇 |
2022年 | 2999篇 |
2021年 | 5112篇 |
2020年 | 3228篇 |
2019年 | 4482篇 |
2018年 | 5234篇 |
2017年 | 4008篇 |
2016年 | 4498篇 |
2015年 | 5062篇 |
2014年 | 6693篇 |
2013年 | 9143篇 |
2012年 | 13223篇 |
2011年 | 13780篇 |
2010年 | 8013篇 |
2009年 | 6834篇 |
2008年 | 11351篇 |
2007年 | 11533篇 |
2006年 | 10771篇 |
2005年 | 10141篇 |
2004年 | 9822篇 |
2003年 | 9094篇 |
2002年 | 8666篇 |
2001年 | 4192篇 |
2000年 | 3988篇 |
1999年 | 3475篇 |
1998年 | 1858篇 |
1997年 | 1486篇 |
1996年 | 1314篇 |
1995年 | 1199篇 |
1994年 | 1085篇 |
1993年 | 993篇 |
1992年 | 2034篇 |
1991年 | 1928篇 |
1990年 | 1663篇 |
1989年 | 1603篇 |
1988年 | 1476篇 |
1987年 | 1302篇 |
1986年 | 1307篇 |
1985年 | 1138篇 |
1984年 | 888篇 |
1983年 | 820篇 |
1982年 | 593篇 |
1981年 | 492篇 |
1980年 | 471篇 |
1979年 | 638篇 |
1978年 | 482篇 |
1975年 | 471篇 |
1974年 | 528篇 |
1973年 | 491篇 |
1972年 | 451篇 |
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 We will search the following websites for ongoing or unpublished trials: http://www.controlled-trials.com/ , http://www.clinicaltrials.gov/ , www.eudraCT.com , http://centerwatch.com/ , The Cochrane Library's CENTRAL,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Methods: Prospective cross-sectional study.
Results: Twenty-seven of 106 patients had positive PCR and/or GWC results on aqueous humor (AH) sampling and 15 of 27 (55.6%) were HIV-positive. Patients with non-anterior uveitis (NAU) were more likely to be HIV+ (p = 0.005). More than 1 possible pathogen was identified in 9 of 27 patients of whom 7 were HIV+. The final clinical diagnosis was discordant with AH findings in 9 of 27 cases. A positive EBV PCR result was associated with a discordant diagnosis (p = 0.001). All cases of herpetic anterior uveitis (42.9% HIV+) tested PCR-/GWC+ while all cases of herpetic NAU tested PCR+/GWC- (83.3% HIV+). All rubella virus cases were PCR+/GWC+.
Conclusion: PCR is useful to diagnose herpetic NAU in HIV+ patients while GWC is useful to diagnose herpetic anterior uveitis. 相似文献