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   1408313篇
  免费   106699篇
  国内免费   2105篇
耳鼻咽喉   20678篇
儿科学   49154篇
妇产科学   38297篇
基础医学   201943篇
口腔科学   38584篇
临床医学   122379篇
内科学   281322篇
皮肤病学   31705篇
神经病学   113962篇
特种医学   56623篇
外国民族医学   660篇
外科学   216098篇
综合类   27647篇
现状与发展   1篇
一般理论   412篇
预防医学   103223篇
眼科学   30776篇
药学   103829篇
  2篇
中国医学   2621篇
肿瘤学   77201篇
  2019年   10583篇
  2018年   15878篇
  2017年   12314篇
  2016年   13921篇
  2015年   15060篇
  2014年   20112篇
  2013年   31400篇
  2012年   42568篇
  2011年   45450篇
  2010年   27077篇
  2009年   24955篇
  2008年   44022篇
  2007年   46994篇
  2006年   47050篇
  2005年   45964篇
  2004年   44611篇
  2003年   43439篇
  2002年   42619篇
  2001年   68167篇
  2000年   71598篇
  1999年   59627篇
  1998年   16569篇
  1997年   14917篇
  1996年   15148篇
  1995年   14259篇
  1994年   13562篇
  1993年   12500篇
  1992年   45649篇
  1991年   44441篇
  1990年   43204篇
  1989年   41119篇
  1988年   37778篇
  1987年   37194篇
  1986年   34465篇
  1985年   33201篇
  1984年   24996篇
  1983年   20994篇
  1982年   12360篇
  1981年   11285篇
  1979年   21973篇
  1978年   15392篇
  1977年   13079篇
  1976年   12171篇
  1975年   13147篇
  1974年   15202篇
  1973年   14570篇
  1972年   13337篇
  1971年   12144篇
  1970年   11435篇
  1969年   10343篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
81.
82.
83.
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   
84.
85.
86.
87.
88.

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   
89.

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   
90.
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