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   1302114篇
  免费   102305篇
  国内免费   3627篇
耳鼻咽喉   18668篇
儿科学   44615篇
妇产科学   35325篇
基础医学   185374篇
口腔科学   34001篇
临床医学   114668篇
内科学   261919篇
皮肤病学   28228篇
神经病学   101987篇
特种医学   52246篇
外国民族医学   684篇
外科学   199134篇
综合类   30961篇
现状与发展   6篇
一般理论   391篇
预防医学   97326篇
眼科学   28514篇
药学   97437篇
  13篇
中国医学   3697篇
肿瘤学   72852篇
  2019年   9925篇
  2018年   14046篇
  2017年   10768篇
  2016年   11718篇
  2015年   13610篇
  2014年   18598篇
  2013年   27478篇
  2012年   38085篇
  2011年   40171篇
  2010年   24165篇
  2009年   22917篇
  2008年   38164篇
  2007年   40822篇
  2006年   41063篇
  2005年   39906篇
  2004年   38754篇
  2003年   37626篇
  2002年   36823篇
  2001年   64523篇
  2000年   66976篇
  1999年   56882篇
  1998年   15430篇
  1997年   14079篇
  1996年   14462篇
  1995年   13710篇
  1994年   12986篇
  1993年   11945篇
  1992年   44733篇
  1991年   43615篇
  1990年   42350篇
  1989年   40191篇
  1988年   36978篇
  1987年   36308篇
  1986年   33675篇
  1985年   32331篇
  1984年   24187篇
  1983年   20286篇
  1982年   11745篇
  1981年   10714篇
  1979年   21353篇
  1978年   14831篇
  1977年   12541篇
  1976年   11698篇
  1975年   12624篇
  1974年   14650篇
  1973年   14110篇
  1972年   12939篇
  1971年   11717篇
  1970年   11040篇
  1969年   10012篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
71.
72.
73.
Jahn  P. 《Der Onkologe》2020,26(11):1040-1046
Die Onkologie - Die Pflegepersonaluntergrenzen als rote Linien zur Abgrenzung einer gefährlichen Pflegepraxis sind nicht geeignet, die dringend benötigte Trendwende einzuleiten und...  相似文献   
74.
75.
76.
77.
78.

Background

Arterial vascular anomalies in patients undergoing kidney transplantation (KT) are correlated with a higher incidence of early surgical complications, potentially causing graft loss. Arterial reconstruction allows patients to overcome these surgical challenges, thus minimizing the risk of poor outcomes. The aim of the present study is to retrospectively investigate the safety and effectiveness of the multiple arterial reconstruction technique with a Teflon patch in case of an unavailable aortic patch: to do so, surgical complications, graft function, and patient survival were evaluated.

Methods

During the period January 2009 to August 2016, 202 adult deceased-donor KTs were performed at our center. Group A (n = 27; reconstruction of multiple arteries) and Group B (n = 175; control group) were compared.

Results

No differences were observed between the 2 groups in terms of early postoperative course, with no vascular complication observed in Group A. No vascular patch infections were reported, nor longer cold ischemia time rates. Similarly, long-term survival rates were similar between the 2 groups.

Conclusions

The Teflon-patch arterial reconstruction technique appears to be safe and effective, with an acceptable balance of benefits and potential risks of using a prosthetic material. Studies based on larger series are needed to further validate this approach.  相似文献   
79.

Objective

Arch obstruction after the Norwood procedure is common and contributes to mortality. We determined the prevalence, associated factors, and practice variability of arch reintervention and assessed whether arch reintervention is associated with mortality.

Methods

From 2005 to 2017, 593 neonates in the Congenital Heart Surgeons' Society Critical Left Heart Obstruction cohort underwent a Norwood procedure. Median follow-up was 3.7 years. Multivariable parametric models, including a modulated renewal analysis, were performed.

Results

Of the 593 neonates, 146 (25%) underwent 218 reinterventions for arch obstruction after the Norwood procedure: catheter-based (n = 168) or surgical (n = 50) at a median age of 4.3 months (quartile 1-quartile 3, 2.6-5.7). Interdigitation of the distal aortic anastomosis was protective against arch reintervention. Development of ≥ moderate tricuspid valve regurgitation and right ventricular dysfunction at any point was associated with arch reintervention. Nonsignificant variables for arch reintervention included shunt type and preoperative aortic measurements. Surgical arch reintervention was protective against arch reintervention, but transcatheter reintervention was associated with increased reintervention. Arch reintervention was not associated with increased mortality. There was wide institutional variation in incidence of arch reintervention (range, 0-40 reinterventions per 100 years patient follow-up) and in preintervention gradient (range, 0-64 mm Hg).

Conclusions

Interdigitation of the distal aortic anastomosis during the Norwood procedure decreased the risk of arch reintervention. Surgical arch reintervention is more definitive than transcatheter. Arch reintervention after the Norwood procedure is not associated with increased mortality. Serial surveillance for arch obstruction, integrated with changes in right ventricular function and tricuspid valve regurgitation, is recommended after the Norwood procedure to improve outcomes.  相似文献   
80.
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