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   2450734篇
  免费   198310篇
  国内免费   4204篇
耳鼻咽喉   34848篇
儿科学   75581篇
妇产科学   64222篇
基础医学   345049篇
口腔科学   68002篇
临床医学   220113篇
内科学   484489篇
皮肤病学   48317篇
神经病学   208577篇
特种医学   99365篇
外国民族医学   886篇
外科学   373708篇
综合类   56882篇
现状与发展   1篇
一般理论   977篇
预防医学   197578篇
眼科学   56309篇
药学   182075篇
  4篇
中国医学   4370篇
肿瘤学   131895篇
  2018年   33371篇
  2017年   26189篇
  2016年   29271篇
  2015年   23629篇
  2014年   33775篇
  2013年   51064篇
  2012年   71213篇
  2011年   80432篇
  2010年   49077篇
  2009年   45531篇
  2008年   77199篇
  2007年   83355篇
  2006年   74182篇
  2005年   73867篇
  2004年   71446篇
  2003年   70063篇
  2002年   68329篇
  2001年   112706篇
  2000年   116939篇
  1999年   98503篇
  1998年   28009篇
  1997年   25729篇
  1996年   25554篇
  1995年   24739篇
  1994年   23315篇
  1993年   21666篇
  1992年   79487篇
  1991年   76504篇
  1990年   73687篇
  1989年   70925篇
  1988年   65940篇
  1987年   64905篇
  1986年   61419篇
  1985年   58473篇
  1984年   44273篇
  1983年   37707篇
  1982年   22950篇
  1981年   20338篇
  1979年   41390篇
  1978年   29044篇
  1977年   24360篇
  1976年   22895篇
  1975年   23965篇
  1974年   29667篇
  1973年   28048篇
  1972年   26226篇
  1971年   24151篇
  1970年   22771篇
  1969年   21111篇
  1968年   19148篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
ContextIt is especially important that patients are well informed when making high-stakes, preference-sensitive decisions like those on the Physician Orders for Life-Sustaining Treatment (POLST) form. However, there is currently no way to easily evaluate whether patients understand key concepts when making these important decisions.ObjectivesTo develop a POLST knowledge survey.MethodsExpert (n = 62) ratings of key POLST facts were used to select items for a POLST knowledge survey. The survey was administered to nursing facility residents (n = 97) and surrogate decision-makers (n = 112). A subset (n = 135) were re-administered the survey after a standardized advance care planning discussion to assess the scale's responsiveness to change.ResultsThe 19-item survey demonstrated adequate reliability (α = 0.72.). Residents' scores (x = 11.4, standard deviation 3.3) were significantly lower than surrogate scores (x = 14.7, standard deviation 2.5) (P < 0.001). Scores for both groups increased significantly after administration of a standardized advance care planning discussion (P < 0.001). Although being a surrogate, age, race, education, cognitive functioning, and health literacy were significantly associated with higher POLST Knowledge Survey scores in univariate analyses, only being a surrogate (P < 0.001) and being white (P = 0.028) remained significantly associated with higher scores in multivariate analyses.ConclusionThe 19-item POLST Knowledge Survey demonstrated adequate reliability and responsiveness to change. Findings suggest the survey could be used to identify knowledge deficits and provide targeted education to ensure adequate understanding of key clinical decisions when completing POLST.  相似文献   
63.
64.
65.
66.
Caring for patients with end-stage kidney disease (ESKD) in the United States is challenging, due in part to the complex epidemiology of the disease's progression as well as the ways in which care is delivered. As CKD progresses toward ESKD, the number of comorbidities increases and care involves multiple healthcare providers from multiple subspecialties. This occurs in the context of a fragmented US healthcare delivery system that is traditionally siloed by provider specialty, organization, as well as systems of payment and administration. This article describes the role of care fragmentation in the delivery of optimal ESKD care and identifies research gaps in the evidence across the continuum of care. We then consider the impact of care fragmentation on ESKD care from the patient and health system perspectives and explore opportunities for system-level interventions aimed at improving care for patients with ESKD.  相似文献   
67.
68.
69.
70.
Red cell exchange (RCE) is a common procedure in adults with sickle cell disease (SCD). Implantable dual lumen Vortex (DLV) ports can be used for RCE in patients with poor peripheral venous access. We performed a retrospective cohort study of RCE procedures performed in adults with SCD. The main objective of the study was to compare the inlet speed, duration of procedures and rate of complications performed through DLV ports to those performed through temporary central venous and peripheral catheters. Twenty‐nine adults with SCD underwent a total of 318 RCE procedures. Twenty adults had DLV ports placed and 218 procedures were performed using DLV ports. Mean length of follow‐up after DLV port placement was 397 ± 263 days. Six DLV ports were removed due to infection and 1 for malfunction after a mean of 171 ± 120 days. Compared to temporary central venous and peripheral catheters, DLV port procedures had a greater rate of procedural complications, a longer duration, and a lower inlet speed (all P < 0.01). When accounting for the maximum allowable inlet speed to avoid citrate toxicity, 40% of DLV port procedures were greater than 10% below maximum speed, compared to 7 and 14% of procedures performed through temporary central venous and peripheral catheters (P < 0.0001). In conclusion, DLV ports can be used for RCE in adults with SCD, albeit with more procedural complications and longer duration. The smaller internal diameter and longer catheter of DLV ports compared to temporary central venous catheters likely accounts for the differences noted. J. Clin. Apheresis 30:353–358, 2015. © 2015 Wiley Periodicals, Inc.  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