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   3210716篇
  免费   256700篇
  国内免费   9325篇
耳鼻咽喉   45262篇
儿科学   100867篇
妇产科学   86436篇
基础医学   446407篇
口腔科学   91975篇
临床医学   293478篇
内科学   634668篇
皮肤病学   69684篇
神经病学   269575篇
特种医学   128993篇
外国民族医学   1111篇
外科学   489507篇
综合类   76907篇
现状与发展   3篇
一般理论   1298篇
预防医学   262227篇
眼科学   73600篇
药学   233607篇
  9篇
中国医学   5769篇
肿瘤学   165358篇
  2018年   32851篇
  2016年   29192篇
  2015年   32872篇
  2014年   46821篇
  2013年   71048篇
  2012年   92190篇
  2011年   98199篇
  2010年   59246篇
  2009年   57107篇
  2008年   92717篇
  2007年   98754篇
  2006年   99862篇
  2005年   97292篇
  2004年   93371篇
  2003年   90461篇
  2002年   88084篇
  2001年   147385篇
  2000年   152370篇
  1999年   128297篇
  1998年   38625篇
  1997年   34844篇
  1996年   35158篇
  1995年   34629篇
  1994年   32459篇
  1993年   30390篇
  1992年   104888篇
  1991年   101660篇
  1990年   98086篇
  1989年   93970篇
  1988年   87445篇
  1987年   86237篇
  1986年   81616篇
  1985年   78438篇
  1984年   59780篇
  1983年   50942篇
  1982年   31499篇
  1981年   28334篇
  1980年   26660篇
  1979年   55680篇
  1978年   39816篇
  1977年   33536篇
  1976年   31335篇
  1975年   32895篇
  1974年   40084篇
  1973年   38178篇
  1972年   35707篇
  1971年   33085篇
  1970年   30916篇
  1969年   28787篇
  1968年   26479篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
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   
32.
33.
34.
35.
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   
36.
37.
38.
39.
40.
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