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   958篇
  免费   90篇
儿科学   27篇
妇产科学   37篇
基础医学   121篇
口腔科学   10篇
临床医学   250篇
内科学   172篇
皮肤病学   8篇
神经病学   54篇
特种医学   39篇
外科学   71篇
综合类   18篇
一般理论   1篇
预防医学   125篇
眼科学   19篇
药学   39篇
肿瘤学   57篇
  2022年   4篇
  2021年   9篇
  2020年   6篇
  2019年   16篇
  2018年   19篇
  2017年   8篇
  2016年   6篇
  2015年   10篇
  2014年   17篇
  2013年   36篇
  2012年   69篇
  2011年   70篇
  2010年   18篇
  2009年   32篇
  2008年   47篇
  2007年   53篇
  2006年   51篇
  2005年   48篇
  2004年   48篇
  2003年   55篇
  2002年   37篇
  2001年   38篇
  2000年   29篇
  1999年   37篇
  1998年   6篇
  1997年   8篇
  1996年   4篇
  1995年   16篇
  1994年   16篇
  1993年   11篇
  1992年   19篇
  1991年   25篇
  1990年   11篇
  1989年   17篇
  1988年   9篇
  1987年   13篇
  1986年   11篇
  1985年   8篇
  1984年   7篇
  1983年   9篇
  1981年   7篇
  1980年   6篇
  1979年   5篇
  1978年   8篇
  1977年   6篇
  1976年   6篇
  1974年   6篇
  1973年   4篇
  1969年   4篇
  1965年   3篇
排序方式: 共有1048条查询结果,搜索用时 15 毫秒
1.
2.
3.
4.
5.
6.
The palliative care of 227 consecutive patients by two support teams was measured according to 17 key indicators in the Support Team Assessment Schedule (STAS), an instrument previously developed and validated for use in these settings. Mean time in care was 71 days (range 1-547); 56 per cent of patients died at home, 26 per cent in hospital, 18 per cent in a hospice. Totalled ratings (sum of 15 items, excluding two items owing to missed ratings) improved in 83 per cent of cases, remained unchanged in 3 per cent and deteriorated in 13 per cent. The main problems which the STAS identified at referral were family anxiety, symptom control, patient anxiety and communication between patient and family. Fifteen of the 17 items showed significant improvements (Wilcoxon Z ranged from -3.18 to -8.20, p less than 0.00005) between referral ratings and ratings for the last week of the patient's life; family anxiety and spiritual needs did not. Patient anxiety and symptom control, although improved, also remained relatively severe at death. These results demonstrate the value of measuring key indicators and indicate areas where improvement in palliative care is needed.  相似文献   
7.
Seventy-nine patients with moderate to severe left ventricular dysfunction who underwent aortocoronary bypass grafting between 1971 and 1977 had follow-up heart catheterization at a mean interval of 3 years. Thirty-three patients (42%) had angiographic improvement in left ventricular function at follow-up and 18 (25%) had a decrease in left ventricular end-diastolic pressure. Fifty-eight patients (73%) had improvement in angina of at least one New York Heart Association class at follow-up. There was no correlation between late improvement in left ventricular function and improvement in angina. Improvement in left ventricular function did not correlate with preoperative indices of severity of coronary disease or with indices of completeness of surgical repair.  相似文献   
8.
OBJECTIVE: To investigate the opinions of stakeholders (service commissioners and providers) on how performance data should be presented, in order to develop effective feedback methods to facilitate the use of these data in decision making. DESIGN: A qualitative analysis of semi-structured face-to-face and telephone interviews. League tables and fictional box plots were presented as an illustrative guide. The themes covered in the interviews were the effectiveness of these two feedback formats, their positive and negative characteristics, and ideas for new and improved feedback mechanisms. PARTICIPANTS: Thirty-six stakeholders representing a range of clinical and non-clinical roles within palliative care and the wider health care system across a variety of statutory and non-statutory organizations from London and the West Midlands. RESULTS: Box plots were received more positively than league tables, and qualitative information was considered more appropriate than pictorial feedback. Conventional methods such as league tables and box plots were judged to lack essential information on which important decisions could be based, such as additional contextual information and the methodological assumptions of the instrument. Both feedback methods were considered useful as an impetus to further discussion. There was a consensus that feedback should be constructive and able to be adapted to the organizational realities in which UK health services function. CONCLUSION: Qualitative research was viewed as the right evidence for gaining an understanding of the quality of end of life care. Stakeholders highlighted the importance of the lay perspective, which requires approaches that illuminate the subjective meanings of patient experience.  相似文献   
9.
Film test.     
J Lyall 《Nursing times》1991,87(46):16-17
  相似文献   
10.
Injury associated with laser-induced tissue ablation may be reduced by using pulsed energy delivery at low repetition rates, as opposed to using continuous wave energy delivery. This study was designed to examine the similarities and differences between these two systems as regards the healing process, and to examine whether one is superior to the other. In order to test this postulate, the healing response of normal and atherosclerotic aorta were examined after exposure in vivo to argon and excimer (XeCl 308 nm) laser radiation in hypercholesterolemic swine. Swine were fed hyperlipidemic diets for eight months following balloon denudation of the descending aorta. Following general anaesthetic, the descending aorta was isolated and laser burns were made on both normal and atherosclerotic intima using a continuous wave argon laser delivered through a 50 diameter quartz fibre, and a XeCl excimer laser carried through a 1 mm diameter fibre. Energy levels of 3 to 5 J were applied with the argon laser. The pulse duration for the excimer laser was 30 ns and craters were produced using 10 to 60 pulses at a repetition rate of 20 Hz and an energy density of 2 J cm–2.Forty-eight hours after laser application, craters created by both lasers were filled with thrombus material. Argon burns were surrounded by thermal and acoustic injury which was not seen with excimer burns. Three weeks after laser application all crater surfaces were reconstituted. Unlike the excimer burns, argon craters demonstrated necrosis well beyond the crater margins and were characterized by multinucleate giant-cell reaction surrounding char debris. By nine weeks both excimer and argon laser burns were covered by fibrous tissue but could be distinguished by the fact that char debris and subjacent tissue injury arose with the argon burns.The results suggest that both lasers can be used to remove focal atherosclerotic plaque from arteries without inducing excessive thrombogenicity. Rapid healing is observed with both; however, damage to surrounding tissue is significantly greater with a continuous energy delivery laser as opposed to pulsed energy delivery.Work supported in part by: Heart and Stroke Foundation of Ontario, Grant-in-Aid No. 5-17  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