全文获取类型
收费全文 | 556486篇 |
免费 | 60318篇 |
国内免费 | 17283篇 |
专业分类
耳鼻咽喉 | 9375篇 |
儿科学 | 12762篇 |
妇产科学 | 10545篇 |
基础医学 | 53801篇 |
口腔科学 | 9132篇 |
临床医学 | 72820篇 |
内科学 | 120823篇 |
皮肤病学 | 12616篇 |
神经病学 | 44826篇 |
特种医学 | 20528篇 |
外国民族医学 | 109篇 |
外科学 | 90521篇 |
综合类 | 36549篇 |
现状与发展 | 120篇 |
一般理论 | 245篇 |
预防医学 | 34692篇 |
眼科学 | 14552篇 |
药学 | 36224篇 |
164篇 | |
中国医学 | 11096篇 |
肿瘤学 | 42587篇 |
出版年
2024年 | 1418篇 |
2023年 | 8484篇 |
2022年 | 10916篇 |
2021年 | 17003篇 |
2020年 | 15591篇 |
2019年 | 12286篇 |
2018年 | 18023篇 |
2017年 | 16120篇 |
2016年 | 17178篇 |
2015年 | 21160篇 |
2014年 | 32123篇 |
2013年 | 34095篇 |
2012年 | 33603篇 |
2011年 | 36067篇 |
2010年 | 27948篇 |
2009年 | 28737篇 |
2008年 | 29334篇 |
2007年 | 28540篇 |
2006年 | 29926篇 |
2005年 | 27772篇 |
2004年 | 22696篇 |
2003年 | 20286篇 |
2002年 | 18930篇 |
2001年 | 10999篇 |
2000年 | 10030篇 |
1999年 | 10960篇 |
1998年 | 9322篇 |
1997年 | 8846篇 |
1996年 | 7581篇 |
1995年 | 7111篇 |
1994年 | 5440篇 |
1993年 | 4310篇 |
1992年 | 4605篇 |
1991年 | 4242篇 |
1990年 | 3475篇 |
1989年 | 3358篇 |
1988年 | 3042篇 |
1987年 | 2692篇 |
1986年 | 2588篇 |
1985年 | 2325篇 |
1984年 | 2222篇 |
1983年 | 2024篇 |
1982年 | 2330篇 |
1981年 | 2080篇 |
1980年 | 1931篇 |
1979年 | 1304篇 |
1978年 | 1345篇 |
1977年 | 1278篇 |
1976年 | 1025篇 |
1974年 | 916篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
11.
AbstractBackground: This study aims to compare the effectiveness of inhaled prostacyclin or its analoguesversus nitric oxide (NO) in treating pulmonary hypertension (PH) after cardiac or pulmonary surgery remains unclear.Methods: PubMed, Cochrane, and Embase databases were searched for literature published prior to December 2019 using the following keywords: inhaled, nitric oxide, prostacyclin, iloprost, treprostinil, epoprostenol, Tyvaso, flolan, and pulmonary hypertension. Randomized controlled trials and multiple-armed prospective studies that evaluated inhaled NO versus prostacyclin (or analogues) in patients for perioperative and/or postoperative PH after either cardiac or pulmonary surgery were included. Retrospective studies, reviews, letters, comments, editorials, and case reports were excluded.Results: Seven studies with a total of 195 patients were included. No difference in the improvement of mean pulmonary arterial pressure (pooled difference in mean change= ?0.10, 95% CI: ?3.98 to 3.78, p?=?.959) or pulmonary vascular resistance (pooled standardized difference in mean change= ?0.27, 95% CI: ?0.60 to 0.05, p?=?.099) were found between the two treatments. Similarly, no difference was found in other outcomes between the two treatments or subgroup analysis.Conclusions: Inhaled prostacyclin (or analogues) was comparable to inhaled NO in treating PH after cardiac or pulmonary surgery.
- Key messages
This study compared the efficacy of inhaled prostacyclin or its analogues versus inhaled NO to treat PH after surgery. The two types of agent exhibited similar efficacy in managing MPAP, PVR, heart rate, and cardiac output was observed.
Inhaled prostacyclin may serve as an alternative treatment option for PH after cardiac or pulmonary surgery.
12.
Christopher N. Cooley Tyler J. Beranek Matthew A. Warpinski Robert Alexander Amanda O. Esquivel 《The American journal of emergency medicine》2019,37(2):199-203
Introduction
In the United States there has been a large increase in participation in lacrosse for both males and females. The purpose of this study was to analyze the number of head injuries, injury rates (calculated using the reported number of participants) and types of head injuries that are seen in emergency departments in the United States.Methods
We compared injuries between male and female lacrosse participants. This was a retrospective study using a publicly available database produced by the US Consumer Product Safety Commission and information about lacrosse participation from US Lacrosse.Results
A linear regression was performed and showed a positive correlation between number of head injuries to males and time from 2002 to 2010 (R2?=?0.823; p?=?0.001). While the number of injuries to the head in female lacrosse participants was not significant. There was a negative correlation between the number of head injuries to males from 2010 to 2016 (R2?=?0.800; p?=?0.007), but again, there was no significance for female injury count (R2?=?0.417; p?=?0.117). Other significant differences between head injuries in males and females included the mechanism of injury and the type of injury recorded.Conclusion
The most recent data from 2010 to 2016, suggest that both males and females have had a decrease in injury rate. However the total number of female head injuries is not significantly decreasing and as the sport continues to grow there will likely be more total head injuries and visits to the emergency department. 相似文献13.
15.
16.
17.
18.
19.
20.
Jeffrey Schatz Robert Buzan 《Journal of the International Neuropsychological Society》2006,12(1):24-33
We assessed midsagittal corpus callosum size in sickle cell disease (SCD) and its relationship to lesion volume, lesion location, and cognitive functioning. Twenty-eight children with SCD and 16 demographic controls completed magnetic resonance imaging (MRI) and neuropsychological testing. Corpus callosum (CC) size was smaller for children with silent infarcts (n = 8) or overt stroke (n = 8) than for those without visible infarcts (n = 12) or control participants. Lesion volume was a robust predictor of IQ and other cognitive scores; total CC size did not typically add explanatory power for these measures. The size of the rostral body of the CC, however, independently predicted measures of distractibility, speeded production, and working memory. Posterior CC size was also decreased among many of the children with SCD, even in the absence of visible infarcts in this region. Brain morphology appears to provide additional information about SCD-related effects on the brain above and beyond visible infarcts. 相似文献