首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   743篇
  免费   48篇
  国内免费   3篇
耳鼻咽喉   8篇
儿科学   42篇
妇产科学   5篇
基础医学   116篇
口腔科学   7篇
临床医学   53篇
内科学   194篇
皮肤病学   14篇
神经病学   9篇
特种医学   17篇
外科学   131篇
综合类   7篇
一般理论   1篇
预防医学   41篇
眼科学   1篇
药学   51篇
中国医学   4篇
肿瘤学   93篇
  2022年   10篇
  2021年   51篇
  2020年   23篇
  2019年   33篇
  2018年   24篇
  2017年   17篇
  2016年   27篇
  2015年   14篇
  2014年   31篇
  2013年   27篇
  2012年   39篇
  2011年   47篇
  2010年   19篇
  2009年   16篇
  2008年   26篇
  2007年   26篇
  2006年   24篇
  2005年   19篇
  2004年   22篇
  2003年   23篇
  2002年   26篇
  2001年   14篇
  2000年   13篇
  1999年   15篇
  1998年   4篇
  1997年   8篇
  1996年   4篇
  1995年   10篇
  1994年   4篇
  1992年   12篇
  1991年   11篇
  1990年   13篇
  1989年   10篇
  1988年   9篇
  1987年   12篇
  1986年   14篇
  1985年   10篇
  1984年   10篇
  1983年   4篇
  1982年   4篇
  1981年   4篇
  1980年   6篇
  1979年   5篇
  1978年   9篇
  1977年   8篇
  1975年   3篇
  1974年   5篇
  1972年   3篇
  1970年   8篇
  1969年   5篇
排序方式: 共有794条查询结果,搜索用时 15 毫秒
81.
Journal of Thrombosis and Thrombolysis - Acute coronary collateralisation of an infarct-related arterial (IRA) territory may be identified during angiography for ST elevation myocardial infarction...  相似文献   
82.
Perineural invasion (PNI) is a prominent characteristic of pancreatic cancer. PNI is a process whereby cancer cells invade the surrounding nerves, thus providing an alternative route for metastatic spread and pain generation. PNI is thought to be an indicator of aggressive tumour behaviour and has been shown to correlate with poor prognosis of patients with pancreatic cancer. Recent studies demonstrated that some signalling molecules and pathways that are involved in PNI are also involved in pain generation. Targeting these signalling pathways has shown some promise in alleviating pain and reducing PNI, which could potentially improve treatment outcomes for patients with pancreatic cancer.  相似文献   
83.
Immune sera from 15 patients with cured amoebic liver abscess were used to recognise the antigens of Entamoeba histolytica (HMI) by immunoblotting. The amoebic proteins most frequently recognised by sera from patients with cured amoebic liver abscess had molecular masses of 8, 13, 18, 22, 29, 38, 45, 67 and 94 kDa. Six plasma membrane-associated amoebic proteins of molecular mass 29, 38, 45–67 complex, 85 and 94 kDa were strongly recognised by such sera. Two plasma membrane-associated antigens of 108 and 129 kDa were not recognised by any sera. None of the crude or plasma membrane-associated antigens were recognised by sera from five patients of idiopathic ulcerative colitis, five patients of persistent giardiasis and five normal healthy subjects. Identifiction of such antigens, especially plasma membrane-associated antigens may pave a way to develop specific diagnostic and immunoprotective agents.  相似文献   
84.
A 58-year-old man presented with left flank pain and a high grade fever. Investigations revealed left pyonephrosis with a left renal stone and a giant left ureteral stone. Nephroureterectomy was performed. The ureteral stone measured 13 cm. long and weighed 90 gm.  相似文献   
85.
86.
87.
External duodenal fistulae from sutured duodenal ulcer perforation sites are difficult to manage and most patients succumb to septicemia and undernutrition. This is due to failure of closure of the perforation site in the duodenum. Most techniques described in the past to facilitate closure have failed to give satisfactory results. We have devised a new procedure where the duodenal ulcer perforation is closed by mobilizing the gall bladder. A hole is made in the fundus of the gall bladder and it is anastomosed to the freshened edges of the duodenal opening. We have treated six patients by this technique. In five patients the leak was satisfactorily sealed. Three patients died - one due to persistent leak and two due to jejunostomy leak.  相似文献   
88.
89.
Transcatheter valve implantation in the pulmonary valve has been established as a valuable treatment option for patients with conduit failure in the right ventricular outflow tract, most often with the use of the Melody valve. Transcatheter valve‐in‐valve (VIV) implantation in the tricuspid position is restricted to single case reports, most often with the implantation of the Edwards SAPIEN valve. A 67 years old male with carcionoid syndrome and previously implanted bioprosthesis in the pulmonary and tricuspid valve now presented with worsening symptoms due to degeneration of both bioprostheses. The risk of new open surgery was deemed to high. We report of the first transatrial double VIV implantation using the balloon expandable Edwards SAPIEN XT in pulmonary and tricuspid position. © 2015 Wiley Periodicals, Inc.  相似文献   
90.

Background

Transcatheter mitral valve replacement (TMVR) is a potential therapy for patients with symptomatic, severe mitral regurgitation (MR). The feasibility of this therapy remains to be defined.

Objectives

The authors report their early experience with TMVR using a new valve system.

Methods

The valve is a self-expanding, nitinol valve with bovine pericardial leaflets that is placed using a transapical delivery system. Patients with symptomatic MR who were deemed high or extreme risk by the local heart teams were enrolled in a global pilot study at 14 sites (United States, Australia, and Europe).

Results

Fifty consecutively enrolled patients (mean age: 73 ± 9 years; 58.0% men; 84% secondary MR) underwent TMVR with the valve. The mean Society for Thoracic Surgery score was 6.4 ± 5.5%; 86% of patients were New York Heart Association functional class III or IV, and the mean left ventricular ejection fraction was 43 ± 12%. Device implant was successful in 48 patients with a median deployment time of 14 min (interquartile range: 12 to 17 min). The 30-day mortality was 14%, with no disabling strokes, or repeat interventions. Median follow-up was 173 days (interquartile range: 54 to 342 days). At latest follow-up, echocardiography confirmed mild or no residual MR in all patients who received implants. Improvements in symptom class (79% in New York Heart Association functional class I or II at follow-up; p < 0.0001 vs. baseline) and Minnesota Heart Failure Questionnaire scores (56.2 ± 26.8 vs. 31.7 ± 22.1; p = 0.011) were observed.

Conclusions

TMVR with the valve was feasible in a study group at high or extreme risk for conventional mitral valve replacement. These results inform trial design of TMVR in lower-risk patients with severe mitral valve regurgitation (Evaluation of the Safety and Performance of the Twelve Intrepid Transcatheter Mitral Valve Replacement System in High Risk Patients with Severe, Symptomatic Mitral Regurgitation – The Twelve Intrepid TMVR Pilot Study; NCT02322840)  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号