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   1306893篇
  免费   101703篇
  国内免费   2039篇
耳鼻咽喉   18688篇
儿科学   45259篇
妇产科学   35665篇
基础医学   187034篇
口腔科学   33822篇
临床医学   114088篇
内科学   265031篇
皮肤病学   28672篇
神经病学   103268篇
特种医学   52071篇
外国民族医学   686篇
外科学   200159篇
综合类   27111篇
现状与发展   1篇
一般理论   383篇
预防医学   97964篇
眼科学   28402篇
药学   96927篇
  2篇
中国医学   2485篇
肿瘤学   72917篇
  2019年   9615篇
  2018年   14083篇
  2017年   10642篇
  2016年   11546篇
  2015年   13188篇
  2014年   17999篇
  2013年   27520篇
  2012年   38361篇
  2011年   40328篇
  2010年   23893篇
  2009年   22659篇
  2008年   38709篇
  2007年   41344篇
  2006年   41449篇
  2005年   40489篇
  2004年   39560篇
  2003年   38243篇
  2002年   37546篇
  2001年   64580篇
  2000年   67070篇
  1999年   56907篇
  1998年   15270篇
  1997年   13863篇
  1996年   14292篇
  1995年   13537篇
  1994年   12850篇
  1993年   11862篇
  1992年   44833篇
  1991年   43734篇
  1990年   42482篇
  1989年   40355篇
  1988年   37128篇
  1987年   36449篇
  1986年   33817篇
  1985年   32463篇
  1984年   24294篇
  1983年   20379篇
  1982年   11806篇
  1981年   10746篇
  1979年   21438篇
  1978年   14885篇
  1977年   12595篇
  1976年   11754篇
  1975年   12679篇
  1974年   14746篇
  1973年   14176篇
  1972年   13007篇
  1971年   11792篇
  1970年   11115篇
  1969年   10102篇
排序方式: 共有10000条查询结果,搜索用时 125 毫秒
71.
72.
73.
74.
75.

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   
76.

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   
77.
78.
79.
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