收费全文 | 4791篇 |
免费 | 312篇 |
国内免费 | 30篇 |
耳鼻咽喉 | 75篇 |
儿科学 | 112篇 |
妇产科学 | 148篇 |
基础医学 | 626篇 |
口腔科学 | 209篇 |
临床医学 | 465篇 |
内科学 | 905篇 |
皮肤病学 | 160篇 |
神经病学 | 204篇 |
特种医学 | 143篇 |
外科学 | 832篇 |
综合类 | 79篇 |
一般理论 | 3篇 |
预防医学 | 337篇 |
眼科学 | 81篇 |
药学 | 480篇 |
中国医学 | 34篇 |
肿瘤学 | 240篇 |
2024年 | 5篇 |
2023年 | 47篇 |
2022年 | 142篇 |
2021年 | 194篇 |
2020年 | 129篇 |
2019年 | 179篇 |
2018年 | 223篇 |
2017年 | 171篇 |
2016年 | 177篇 |
2015年 | 193篇 |
2014年 | 271篇 |
2013年 | 316篇 |
2012年 | 432篇 |
2011年 | 431篇 |
2010年 | 249篇 |
2009年 | 193篇 |
2008年 | 267篇 |
2007年 | 231篇 |
2006年 | 210篇 |
2005年 | 187篇 |
2004年 | 153篇 |
2003年 | 128篇 |
2002年 | 114篇 |
2001年 | 37篇 |
2000年 | 42篇 |
1999年 | 38篇 |
1998年 | 22篇 |
1997年 | 22篇 |
1996年 | 26篇 |
1995年 | 20篇 |
1994年 | 14篇 |
1993年 | 18篇 |
1992年 | 18篇 |
1991年 | 22篇 |
1990年 | 24篇 |
1989年 | 18篇 |
1988年 | 14篇 |
1987年 | 26篇 |
1986年 | 24篇 |
1985年 | 13篇 |
1984年 | 8篇 |
1983年 | 10篇 |
1982年 | 9篇 |
1981年 | 8篇 |
1980年 | 11篇 |
1979年 | 5篇 |
1978年 | 5篇 |
1971年 | 8篇 |
1970年 | 4篇 |
1966年 | 4篇 |
![点击此处可从《APMIS : acta pathologica, microbiologica, et immunologica Scandinavica》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Background
In the emergency department, rib fractures are a common finding in patients who sustain chest trauma. Rib fractures may be a sign of significant, underlying pathology, especially in the elderly patients where rib fractures are associated with significant morbidity and mortality. To date, no studies have evaluated the ability of ultrasound to detect rib fractures using cadaver models and subsequently use this model as a teaching tool.Objectives
The purpose of this study was to determine if it is possible to generate rib fractures on cadaver models which could be accurately identified using ultrasound.Methods
This was a cross-sectional study performed during one session at a cadaver lab. A single hemithorax from four adult cadavers were used as models. Single rib fractures on each of rib five through eight were created. Four subjects, blinded to the normal versus fractured ribs, were asked to identify the presence of a fracture on each rib.Results
A total of 8 of 16 potential ribs had fractured induced by study staff. Mean accuracy was 55% for all subjects. The overall sensitivity and specificity for detecting rib fractures was 50% (CI: 31.89–68.11) and 59.38% (CI: 35.69–73.55) respectively. The overall PPV and NPV was 55.17% and 54.29% respectively.Conclusions
In this pilot study, subjects were not able to detect induced rib fractures using ultrasound on cadaver models. The use of this model as a teaching tool in the detection of rib fractures requires further investigation. 相似文献Methods: In this prospective observational study, 15 volunteers underwent sciatic nerve examination using a curved ultrasound probe in the range of 2-5 MHz and a Philips-ATL 5000 unit (ATL Ultrasound, Bothell, WA) in the gluteal, infragluteal, and proximal thigh regions. Thereafter, an insulated block needle was advanced inline with the ultrasound beam to reach the nerve target, which was further confirmed by electrical stimulation. The quality of sciatic nerve images, ease of needle to nerve contact, threshold stimulating current, and resultant motor response were recorded.
Results: The sciatic nerve was successfully identified in the transverse view as a solitary predominantly hyperechoic structure on ultrasound in all of the three regions examined. The target nerve was visualized easily in 87% and localized within two needle attempts in all patients. Nerve stimulation was successful in 100% after two attempts with a threshold current of 0.42 +/- 0.12 (mean +/- SD) eliciting foot plantarflexion or dorsiflexion. 相似文献
![点击此处可从《Journal of the Royal Society of Medicine》网站下载免费的PDF全文](/ch/ext_images/free.gif)