全文获取类型
收费全文 | 7908篇 |
免费 | 344篇 |
国内免费 | 80篇 |
专业分类
耳鼻咽喉 | 3篇 |
儿科学 | 333篇 |
妇产科学 | 65篇 |
基础医学 | 144篇 |
临床医学 | 3996篇 |
内科学 | 1991篇 |
皮肤病学 | 9篇 |
神经病学 | 20篇 |
特种医学 | 371篇 |
外科学 | 278篇 |
综合类 | 750篇 |
预防医学 | 128篇 |
药学 | 207篇 |
2篇 | |
中国医学 | 18篇 |
肿瘤学 | 17篇 |
出版年
2023年 | 95篇 |
2022年 | 181篇 |
2021年 | 211篇 |
2020年 | 218篇 |
2019年 | 181篇 |
2018年 | 247篇 |
2017年 | 169篇 |
2016年 | 168篇 |
2015年 | 239篇 |
2014年 | 519篇 |
2013年 | 463篇 |
2012年 | 428篇 |
2011年 | 512篇 |
2010年 | 425篇 |
2009年 | 485篇 |
2008年 | 515篇 |
2007年 | 512篇 |
2006年 | 457篇 |
2005年 | 419篇 |
2004年 | 326篇 |
2003年 | 232篇 |
2002年 | 170篇 |
2001年 | 200篇 |
2000年 | 172篇 |
1999年 | 119篇 |
1998年 | 71篇 |
1997年 | 75篇 |
1996年 | 75篇 |
1995年 | 56篇 |
1994年 | 45篇 |
1993年 | 24篇 |
1992年 | 38篇 |
1991年 | 25篇 |
1990年 | 18篇 |
1989年 | 22篇 |
1988年 | 21篇 |
1987年 | 21篇 |
1986年 | 23篇 |
1985年 | 11篇 |
1984年 | 28篇 |
1983年 | 14篇 |
1982年 | 24篇 |
1981年 | 13篇 |
1980年 | 13篇 |
1979年 | 8篇 |
1978年 | 9篇 |
1977年 | 6篇 |
1976年 | 14篇 |
1975年 | 5篇 |
1974年 | 5篇 |
排序方式: 共有8332条查询结果,搜索用时 31 毫秒
1.
2.
3.
Ángel Becerra Héctor Trujillo Lucía Valencia Aurelio Rodríguez‐Pérez 《Brazilian Journal of Anesthesiology》2019,69(2):200-203
Background and objectives
A prompt and effective management of trauma patient is necessary. The aim of this case report is to highlight the importance of intraoperative echocardiography as a useful tool in patients suffering from refractory hemodynamic instability no otherwise explained.Case report
A 41 year‐old woman suffered a car accident. At the emergency department, no abnormalities were found in ECG or chest X‐ray. Abdominal ultrasound revealed the presence of abdominal free liquid and the patient was submitted to urgent exploratory laparotomy. Nevertheless, she persisted suffering arterial hypotension and metabolic acidosis. Looking for the reason of her hemodynamic instability, intraoperative transthoracic echocardiography was performed, finding out the presence of pericardial effusion. Once the cardiac surgeon extracted pericardial clots, patient's situation improved clinically and analytically.Conclusion
Every anesthesiologist should be able to use the intraoperative echocardiography as an effective tool in order to establish the appropriate measures to promote the survival of patients suffering severe trauma. 相似文献4.
5.
Martin V. Andersen Cooper Moore Peter Søgaard Daniel Friedman Brett D. Atwater Kristine Arges Melissa LeFevre Johannes J. Struijk Joseph Kisslo Samuel E. Schmidt Olaf T. von Ramm 《Ultrasound in medicine & biology》2019,45(5):1197-1207
Recently, we developed a high-frame-rate echocardiographic imaging system capable of acquiring images at rates up to 2500 per second. High imaging rates were used to quantify longitudinal strain parameters in patients with echocardiographically normal function. These data can serve as a baseline for comparing strain parameters in disease states. The derived timing data also reveal the propagation of mechanical events in the left ventricle throughout the cardiac cycle. High-frame-rate echocardiographic images were acquired from 17 patients in the apical four-chamber view using Duke University's phased array ultrasound system, T5. B-Mode images were acquired at 500–1000 images per second by employing 16:1 or 32:1 parallel processing in receive, a scan depth ≤14 cm and an 80° field of view with a 3.5-MegaHertZ (MHz), 96-element linear array. The images were analyzed using a speckle tracking algorithm tailored for high-frame-rate echocardiographic images developed at Aalborg and Duke University. Four specific mechanical events were defined using strain curves from six regions along the myocardial contour of the left ventricle. The strain curves measure the local deformation events of the myocardium and are independent of the overall cardiac motion. We observed statistically significant differences in the temporal sequence among different myocardial segments for the first mechanical event described, myocardial tissue shortening onset (p < 0.01). We found that the spatial origin of tissue shortening was located near the middle of the interventricular septum in patients with echocardiographically normal function. The quantitative parameters defined here, based on high-speed strain measurements in patients with echocardiographically normal function, can serve as a means of assessing degree of contractile abnormality in the myocardium and enable the identification of contraction propagation. The relative timing pattern among specific events with respect to the Q wave may become an important new metric in assessing cardiac function and may, in turn, improve diagnosis and prognosis. 相似文献
6.
7.
8.
9.
10.