首页 | 官方网站   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   3361639篇
  免费   241636篇
  国内免费   8555篇
医药卫生   3611830篇
  2019年   25878篇
  2018年   36587篇
  2017年   28013篇
  2016年   32178篇
  2015年   36270篇
  2014年   50016篇
  2013年   75550篇
  2012年   101058篇
  2011年   107112篇
  2010年   64619篇
  2009年   61787篇
  2008年   100539篇
  2007年   107042篇
  2006年   108577篇
  2005年   104516篇
  2004年   101120篇
  2003年   97679篇
  2002年   94581篇
  2001年   161231篇
  2000年   165688篇
  1999年   140199篇
  1998年   40209篇
  1997年   35784篇
  1996年   35982篇
  1995年   34699篇
  1994年   32155篇
  1993年   30133篇
  1992年   110091篇
  1991年   106351篇
  1990年   103295篇
  1989年   99736篇
  1988年   91536篇
  1987年   89830篇
  1986年   84044篇
  1985年   80308篇
  1984年   60042篇
  1983年   50844篇
  1982年   29908篇
  1981年   26993篇
  1979年   53336篇
  1978年   37491篇
  1977年   31972篇
  1976年   29652篇
  1975年   31693篇
  1974年   37323篇
  1973年   35571篇
  1972年   33270篇
  1971年   30665篇
  1970年   28571篇
  1969年   26930篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
51.
52.

Background

Limited data exists demonstrating the efficacy of minimally invasive surgery (MIS) compared to median sternotomy (MS) for multiple valvular disease (MVD). This systematic review and meta-analysis aims to compare operative and peri-operative outcomes of MIS vs MS in MVD.

Methods

PubMed, Ovid, and Embase were searched from inception until August 2019 for randomized and observational studies comparing MIS and MS in patients with MVD. Clinical outcomes of intra- and postoperative times, reoperation for bleeding and surgical site infection were evaluated.

Results

Five observational studies comparing 340 MIS vs 414 MS patients were eligible for qualitative and quantitative review. The quality of evidence assessed using the Newcastle-Ottawa scale was good for all included studies. Meta-analysis demonstrated increased cardiopulmonary bypass time for MIS patients (weighted mean difference [WMD], 0.487; 95% confidence interval [CI], 0.365-0.608; P < .0001). Similarly, aortic cross-clamp time was longer in patients undergoing MIS (WMD, 0.632; 95% CI, 0.509-0.755; P < .0001). No differences were found in operative mortality, reoperation for bleeding, surgical site infection, or hospital stay.

Conclusions

MIS for MVD have similar short-term outcomes compared to MS. This adds value to the use of minimally invasive methods for multivalvular surgery, despite conferring longer operative times. However, the paucity in literature and learning curve associated with MIS warrants further evidence, ideally randomized control trials, to support these findings.
  相似文献   
53.
54.
55.
56.
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   
57.
58.
59.
60.
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-23

京公网安备 11010802026262号