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   2068838篇
  免费   168743篇
  国内免费   4796篇
耳鼻咽喉   28948篇
儿科学   65894篇
妇产科学   60228篇
基础医学   296006篇
口腔科学   58094篇
临床医学   184634篇
内科学   405397篇
皮肤病学   46594篇
神经病学   170913篇
特种医学   80660篇
外国民族医学   628篇
外科学   314110篇
综合类   52407篇
现状与发展   4篇
一般理论   715篇
预防医学   163185篇
眼科学   48202篇
药学   148915篇
  1篇
中国医学   4466篇
肿瘤学   112376篇
  2018年   21933篇
  2017年   16836篇
  2016年   19075篇
  2015年   21641篇
  2014年   30749篇
  2013年   46269篇
  2012年   62549篇
  2011年   66020篇
  2010年   38750篇
  2009年   36950篇
  2008年   61477篇
  2007年   65634篇
  2006年   66083篇
  2005年   64234篇
  2004年   61861篇
  2003年   59318篇
  2002年   57271篇
  2001年   96916篇
  2000年   99220篇
  1999年   82915篇
  1998年   24134篇
  1997年   21845篇
  1996年   21782篇
  1995年   20681篇
  1994年   19121篇
  1993年   17932篇
  1992年   64853篇
  1991年   62413篇
  1990年   60338篇
  1989年   57706篇
  1988年   53525篇
  1987年   52402篇
  1986年   49353篇
  1985年   47368篇
  1984年   36359篇
  1983年   30835篇
  1982年   19211篇
  1981年   17355篇
  1979年   34118篇
  1978年   24300篇
  1977年   20308篇
  1976年   18940篇
  1975年   19875篇
  1974年   24395篇
  1973年   23499篇
  1972年   22205篇
  1971年   20372篇
  1970年   19419篇
  1969年   18387篇
  1968年   16969篇
排序方式: 共有10000条查询结果,搜索用时 921 毫秒
121.
122.
123.
124.
125.
126.

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   
127.
128.
129.
130.
BackgroundThe aim of this paper is to assess the current state of quality and outcomes measures being reported for hepatic resections in the recent literature.MethodsMedline and PubMed databases were searched for English language articles published between 1 January 2002 and 30 April 2013. Two examiners reviewed each article and relevant citations for appropriateness of inclusion, which excluded papers of liver donor hepatic resections, repeat hepatectomies or meta-analyses. Data were extracted and summarized by two examiners for analysis.ResultsFifty-five studies were identified with suitable reporting to assess peri-operative mortality in hepatic resections. In only 35% (19/55) of the studies was the follow-up time explicitly stated, and in 47% (26/55) of studies peri-operative mortality was limited to in-hospital or 30 days. The time period in which complications were captured was not explicitly stated in 19 out of 28 studies. The remaining studies only captured complications within 30 days of the index operation (8/28). There was a paucity of quality literature addressing truly patient-centred outcomes.ConclusionQuality outcomes after a hepatic resection are inconsistently reported in the literature. Quality outcome studies for a hepatectomy should report mortality and morbidity at a minimum of 90 days after surgery.  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