收费全文 | 1942篇 |
免费 | 105篇 |
国内免费 | 19篇 |
耳鼻咽喉 | 57篇 |
儿科学 | 27篇 |
妇产科学 | 52篇 |
基础医学 | 193篇 |
口腔科学 | 26篇 |
临床医学 | 217篇 |
内科学 | 483篇 |
皮肤病学 | 15篇 |
神经病学 | 115篇 |
特种医学 | 88篇 |
外科学 | 448篇 |
综合类 | 9篇 |
一般理论 | 4篇 |
预防医学 | 56篇 |
眼科学 | 45篇 |
药学 | 68篇 |
中国医学 | 1篇 |
肿瘤学 | 162篇 |
2023年 | 16篇 |
2022年 | 15篇 |
2021年 | 29篇 |
2020年 | 27篇 |
2019年 | 44篇 |
2018年 | 51篇 |
2017年 | 43篇 |
2016年 | 54篇 |
2015年 | 60篇 |
2014年 | 111篇 |
2013年 | 111篇 |
2012年 | 186篇 |
2011年 | 167篇 |
2010年 | 114篇 |
2009年 | 90篇 |
2008年 | 170篇 |
2007年 | 152篇 |
2006年 | 115篇 |
2005年 | 106篇 |
2004年 | 110篇 |
2003年 | 71篇 |
2002年 | 61篇 |
2001年 | 22篇 |
2000年 | 17篇 |
1999年 | 15篇 |
1998年 | 7篇 |
1997年 | 4篇 |
1996年 | 5篇 |
1995年 | 10篇 |
1994年 | 3篇 |
1993年 | 9篇 |
1992年 | 7篇 |
1991年 | 6篇 |
1989年 | 3篇 |
1988年 | 3篇 |
1986年 | 3篇 |
1985年 | 3篇 |
1984年 | 5篇 |
1983年 | 4篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 3篇 |
1979年 | 8篇 |
1978年 | 2篇 |
1977年 | 2篇 |
1976年 | 3篇 |
1975年 | 2篇 |
1974年 | 2篇 |
1971年 | 3篇 |
1970年 | 2篇 |
Objective
The aim of the study was to present the results for patients with atherosclerotic aneurysm of the descending thoracic aorta (DTA) treated with a novel thoracic stent graft.Methods
A single-center retrospective review of prospectively collected data was performed. We extracted demographic variables as well as atherosclerotic comorbidities and operation-related and imaging-related data from patients' medical records. We estimated technical success rate, in-hospital and 30-day mortality, and mortality at the end of follow-up as well as complication and reintervention rate in our study cohort. Follow-up computed tomography angiography was performed after 1 month and 6 months and yearly thereafter.Results
A total of 30 patients (80% male; mean age, 73.7 ± 6.33 years) were treated with Ankura Thoracic Stent Graft (Lifetech, Shenzhen, China) for DTA aneurysm from February 2014 until June 2017. Technical success of the thoracic endovascular aortic repair (TEVAR) was 97% (29/30 patients). A surgical conduit was required in one patient; in three patients, we intentionally covered the left subclavian artery because of insufficient proximal landing zone. No aorta-related deaths were recorded during follow-up. During the early postoperative period, two patients (7%) with long DTA coverage developed paralysis or paraparesis, which immediately resolved after lumbar drainage. No renal complications requiring dialysis were observed. One patient (3%) developed postoperative pulmonary infection, whereas access site complications were 7%. Two symptomatic patients treated outside instructions for use (7%) developed early type IA endoleak and one patient (3%) developed type IB endoleak; type II endoleak was recorded in 3% of the study cohort. During the 30-day postoperative period, two patients died of non-TEVAR-related causes, one of gastrointestinal bleeding and the other of pulmonary infection. During a median follow-up of 31.7 (range, 38.4) months, two more patients also died of non-TEVAR-related causes, one of stroke from carotid artery disease and the other of motor vehicle trauma. In the rest of the cohort, no other adverse events were noted.Conclusions
This novel endograft showed early evidence of a safe, effective, and durable endoprosthesis for the treatment of DTA aneurysms. 相似文献Design: Cross-sectional study.
Methods: Ten subjects with complete cervical SCI and fourteen subjects with complete low thoracic SCI were prospectively recruited from the community and further divided in sedentary and physically active groups, the latter defined as regular weekly 4 hour physical activity for the preceding 3 months. Sixteen healthy individuals matched for sex and age were recruited to participate in the control group. The Low Frequency (LF), High Frequency (HF) powers and the LF/HF ratio of HRV were measured from continuous electrocardiogram (ECG) recordings at rest and after sitting using a fast Fourier transformation.
Outcome measures: The LF,HF, and the LF/HF ratio at rest and after sitting.
Results: A significant decrease in all HRV parameters in patients with SCI was found compared to controls. The change in HF, LF and LF/HF following sitting maneuver was significantly greater in controls as compared with the SCI group and greater in subjects with paraplegia as compared to subjects with tetraplegia. Better HRV values and enhanced vagal activity appears to be related to the type of physical activity in active subjects with paraplegia.
Conclusion: In this cohort of subjects spectral parameters of HRV were associated with the level of the injury. Passive standing was associated with higher HRV values in subjects with paraplegia. 相似文献