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   341994篇
  免费   282081篇
  国内免费   37508篇
耳鼻咽喉   3186篇
儿科学   8430篇
妇产科学   5986篇
基础医学   98991篇
口腔科学   3473篇
临床医学   65943篇
内科学   111029篇
皮肤病学   6176篇
神经病学   28036篇
特种医学   14742篇
外国民族医学   12篇
外科学   53735篇
综合类   58505篇
现状与发展   1篇
一般理论   24篇
预防医学   51007篇
眼科学   21085篇
药学   63312篇
  4篇
中国医学   48021篇
肿瘤学   19885篇
  2020年   6317篇
  2019年   13273篇
  2018年   17695篇
  2017年   18932篇
  2016年   15933篇
  2015年   14590篇
  2014年   14195篇
  2013年   14179篇
  2012年   18250篇
  2011年   19877篇
  2010年   18748篇
  2009年   25982篇
  2008年   15074篇
  2007年   11276篇
  2006年   10589篇
  2005年   20192篇
  2004年   28006篇
  2003年   22171篇
  2002年   13790篇
  2001年   14247篇
  2000年   8345篇
  1999年   13779篇
  1998年   14991篇
  1997年   14746篇
  1996年   15476篇
  1995年   15475篇
  1994年   15318篇
  1993年   14243篇
  1992年   13366篇
  1991年   12651篇
  1990年   11577篇
  1989年   11310篇
  1988年   10786篇
  1987年   10133篇
  1986年   9612篇
  1985年   8617篇
  1984年   6643篇
  1983年   6633篇
  1982年   7667篇
  1981年   7222篇
  1980年   6873篇
  1979年   6706篇
  1978年   5868篇
  1977年   6165篇
  1976年   5779篇
  1975年   5534篇
  1974年   5078篇
  1973年   4799篇
  1972年   4791篇
  1971年   4115篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
191.
Objective: Induction chemoradiotherapy followed by anatomical resection is a current therapeutic strategy for non-small-cell lung cancer with mediastinal node involvement. Dense peritracheal fibrosis and sclerosis after chemoradiotherapy cause difficult mediastinal node dissection. We evaluated a novel technique to make the mediastinal node dissection easier after induction therapy. Methods: At the end of mediastinoscopic node biopsy for staging of lung cancer, cotton-type collagen was inserted anterior and lateral to the trachea in patients with pathologically confirmed mediastinal node involve-ment (n=45). The induction therapy consisted of concurrent use of platinum-based chemotherapy and hyperfractionated radiotherapy. After the chemoradiotherapy all patients underwent a pulmonary resection with complete mediastinal node dissection 7–12 weeks after the collagen insertion. Surgical findings of the mediastinum and the time for node dissection were compared with those without collagen insertion at mediastinoscopy after chemoradiotherapy (n=5). Results: All five patients without collagen insertion showed sclerotic and fibrotic change of mediastinal nodes with severe adhesion to the trachea. In 42 of 45 patients with collagen insertion (93.3%) the collagen remained unabsorbed and separated the mediastinal nodes from the trachea. Mediastinal node dissection was easily accomplished by removing mediastinal tissues lateral and anterior to the collagen. The rate of mediastinal node separation was significantly higher with collagen insertion than without (p< 0.0001). The times for node dissection in patients with and without collagen insertion showed no significant difference. Conclusion: Cotton-type collagen insertion at staging mediastinoscopy for lung cancer separates the mediastinal nodes from the trachea and makes the node dissection easier after induction chemoradiotherapy.  相似文献   
192.
Abstract Background: Does there exist a difference in the outcome of severely injured children and severely injured healthy adults? Methods: The data of 1,566 severely injured patients, treated between May 1998 and December 2002 in our emergency department of the University Essen/Germany, were analyzed. Patients with an injury severity score (ISS) > 24 were included in the present study. Patients younger as 18 (17) years were located to the children group c. Patients aged 18 and up to the age of 54 were included in the adult group a. Results: Fifty-four children and 252 adults met the selection criteria. ISS and the Glasgow coma scale (GCS) before intubation were not statistically different in both groups. Seriously injured children stayed significantly shorter on the intensive care unit, required significantly less ventilator days. Furthermore, the incidence of single organ failure (SOF) and multiple organ failure (MOF) was significantly lower in the children group. Mortality in the children group (29.6%) was lower than that in the adult group (33.7%). There was no death due to MOF in the children group as compared to 2.4% (n = 6) in the adults. Conclusion: The incidence of SOF and MOF was significantly lower in the children group although there was no difference in ISS, GCS and injury patterns. The prognosis of severely injured children was found to be better than those of adults. Moreover, there was no death due to MOF in the children group.  相似文献   
193.
194.
195.
196.
197.
目的探讨应用电解可脱性弹簧圈(GDC)栓塞治疗颅内动脉瘤的临床效果。方法2002年6月-2004年6月我们采用GDC栓塞颅内动脉瘤126例(其中4例有2个动脉瘤,共130个)。前交通动脉瘤42个,后交通动脉瘤53个,颈内动脉瘤6个,大脑中动脉瘤10个,大脑后动脉瘤8个,大脑前动脉瘤6个,小脑后下动脉瘤2个;基底动脉瘤3个。按Hunt-Hess分级:Ⅰ级38例,Ⅱ级54例,Ⅲ级23例,Ⅳ级11例。必要时辅以篮筐技术、重塑技术、支架技术、双微导管或连环技术、蚕食技术。结果成功栓塞126例动脉瘤,其中103例为100%栓塞,21例为95%,2例为90%。12例在栓塞后6~18个月进行造影随访,所栓塞动脉瘤均未见复发征象。结论GDC栓塞颅内动脉瘤是安全、有效和微创的治疗手段。联合运用多种栓塞技术有助于减少术后并发症,提高治愈率。  相似文献   
198.
INTRODUCTION Alzheimer disease can be classified into familial Alzheimer disease (FAD) and sporadic Alzheimer disease (SAD)[1]. Among FAD, ear- ly-onset FAD(EOFAD) is a familialform in which the onset ofsymptoms occurs before the age of 60 to 65 years, an…  相似文献   
199.
在颈椎前路减压、植骨、带锁钢板内固定技术日渐成熟的今天,越来越多的医院开展了该项手术。自1998年2月-2005年8月应用该方法治疗颈椎病215例,发生与内置物钢板及钛网相关的并发症14例,为此积累了一定的经验,现总结如下。1临床资料本组215例,男126例,女89例;年龄42~82岁,平均  相似文献   
200.
We report the case of a 4-year-old girl who had quadricuspid aortic valve regurgitation with tetralogy of Fallot and pulmonary atresia. This combination is very uncommon. Aortic valve replacement was performed successfully due to aortic regurgitation which had progressed one year after the total repair. The dilated aortic annulus plus quadricuspid aortic valve may result in progressive aortic regurgitation for a short period.  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