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   912432篇
  免费   75197篇
  国内免费   2014篇
耳鼻咽喉   13379篇
儿科学   25970篇
妇产科学   26076篇
基础医学   130773篇
口腔科学   26332篇
临床医学   80334篇
内科学   175001篇
皮肤病学   17671篇
神经病学   75109篇
特种医学   36917篇
外国民族医学   175篇
外科学   144650篇
综合类   25364篇
现状与发展   3篇
一般理论   329篇
预防医学   71427篇
眼科学   21541篇
药学   67875篇
中国医学   1651篇
肿瘤学   49066篇
  2018年   8372篇
  2015年   8628篇
  2014年   12561篇
  2013年   18982篇
  2012年   25898篇
  2011年   27258篇
  2010年   15785篇
  2009年   14865篇
  2008年   25691篇
  2007年   27843篇
  2006年   27740篇
  2005年   27496篇
  2004年   26981篇
  2003年   25800篇
  2002年   24846篇
  2001年   36288篇
  2000年   36825篇
  1999年   31429篇
  1998年   9911篇
  1997年   9126篇
  1996年   8979篇
  1995年   8480篇
  1994年   8162篇
  1992年   27010篇
  1991年   26421篇
  1990年   25885篇
  1989年   24953篇
  1988年   23484篇
  1987年   23140篇
  1986年   21995篇
  1985年   21403篇
  1984年   16816篇
  1983年   14359篇
  1982年   9319篇
  1981年   8648篇
  1980年   8107篇
  1979年   16970篇
  1978年   12378篇
  1977年   10450篇
  1976年   9527篇
  1975年   10363篇
  1974年   12863篇
  1973年   12307篇
  1972年   11689篇
  1971年   10819篇
  1970年   10334篇
  1969年   9996篇
  1968年   8977篇
  1967年   8293篇
  1966年   7718篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
41.
42.
43.
44.
45.

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   
46.
47.
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   
48.
49.
50.
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