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   2139127篇
  免费   168286篇
  国内免费   3544篇
耳鼻咽喉   29153篇
儿科学   70609篇
妇产科学   59742篇
基础医学   313056篇
口腔科学   63088篇
临床医学   189970篇
内科学   413226篇
皮肤病学   46655篇
神经病学   167187篇
特种医学   84056篇
外国民族医学   534篇
外科学   323544篇
综合类   51060篇
现状与发展   4篇
一般理论   689篇
预防医学   162866篇
眼科学   49393篇
药学   162880篇
  4篇
中国医学   4855篇
肿瘤学   118386篇
  2018年   20793篇
  2016年   18109篇
  2015年   20712篇
  2014年   28373篇
  2013年   43024篇
  2012年   58272篇
  2011年   61494篇
  2010年   36334篇
  2009年   34539篇
  2008年   58442篇
  2007年   61871篇
  2006年   63029篇
  2005年   60632篇
  2004年   59712篇
  2003年   56769篇
  2002年   55679篇
  2001年   101798篇
  2000年   104948篇
  1999年   88422篇
  1998年   23728篇
  1997年   21230篇
  1996年   21372篇
  1995年   20790篇
  1994年   19473篇
  1993年   18218篇
  1992年   72254篇
  1991年   70782篇
  1990年   69116篇
  1989年   67236篇
  1988年   62296篇
  1987年   61005篇
  1986年   58143篇
  1985年   55844篇
  1984年   41625篇
  1983年   35615篇
  1982年   20603篇
  1981年   18441篇
  1980年   17315篇
  1979年   39224篇
  1978年   27317篇
  1977年   23013篇
  1976年   21893篇
  1975年   23344篇
  1974年   28258篇
  1973年   27112篇
  1972年   25055篇
  1971年   23526篇
  1970年   21905篇
  1969年   20425篇
  1968年   18729篇
排序方式: 共有10000条查询结果,搜索用时 363 毫秒
11.
12.
IntroductionHip displacement is common in cerebral palsy (CP) and is related to the severity of neurological and functional impairment. It is a silent, but progressive disease, and can result in significant morbidity and decreased quality of life, if left untreated. The pathophysiology of hip displacement in CP is a combination of hip flexor-adductor muscle spasticity, abductor muscle weakness, and delayed weight-bearing, resulting in proximal femoral deformities and progressive acetabular dysplasia. Due to a lack of symptoms in the early stages of hip displacement, the diagnosis is easily missed. Awareness of this condition and regular surveillance by clinical examination and serial radiographs of the hips are the key to early diagnosis and treatment.Hip surveillance programmesSeveral population-based studies from around the world have demonstrated that universal hip surveillance in children with CP allows early detection of hip displacement and appropriate early intervention, with a resultant decrease in painful dislocations. Global hip surveillance models are based upon the patients’ age, functional level determined by the Gross Motor Function Classification system (GMFCS), gait classification, standardized clinical exam, and radiographic indices such as the migration percentage (MP), as critical indicators of progressive hip displacement.ConclusionDespite 25 years of evidence showing the efficacy of established hip surveillance programmes, there is poor awareness among healthcare professionals in India about the importance of regular hip surveillance in children with CP. There is a need for professional organizations to develop evidence-based guidelines for hip surveillance which are relevant to the Indian context.  相似文献   
13.
Inflammatory bowel disease (IBD) is a chronic disease that requires chronic treatment throughout the evolution of the disease, with a complex physiopathology that entails great challenges for the development of new and specific treatments for ulcerative colitis and Crohn´s disease. The anti-tumor necrosis factor alpha therapy has impacted the clinical course of IBD in those patients who do not respond to conventional treatment, so there is a need to develop new therapies and markers of treatment response. Various pathways involved in the development of the disease are known and the new therapies have focused on blocking the inflammatory process at the gastrointestinal level by oral, intravenous, subcutaneous, and topical route. All these new therapies can lead to more personalized treatments with higher success rates and fewer relapses. These treatments have not only focused on clinical remission, but also on achieving macroscopic changes at the endoscopic level and microscopic changes by achieving mucosal healing. These treatments are mainly based on modifying signaling pathways, by blocking receptors or ligands, reducing cell migration and maintaining the integrity of the epithelial barrier. Therefore, this review presents the efficacy and safety of the new treatments that are currently under study and the advances that have been made in this area in recent years.  相似文献   
14.
15.
16.
17.
18.
19.
20.
Comprehensive evidence regarding the treatment of non-anaemic iron deficiency in patients undergoing valvular heart surgery is lacking. This study aimed to investigate the association between non-anaemic iron deficiency and postoperative outcomes in these patients. We retrospectively analysed 321 patients of which 180 (56%) had iron deficiency (defined as serum ferritin < 100 ng.ml-1 or < 300 ng.ml-1 with transferrin saturation < 20%). While the iron-deficient group had lower pre-operative haemoglobin levels than the non-iron deficient group (median (IQR [range]) 134 (127–141 [120–172]) g.l-1, 143 (133–150 [120–179]) g.l-1, p = 0.001), there was no between-group difference in allogeneic red blood cell transfusion. Median (IQR [range]) days alive and out of hospital at postoperative day 90 was 1 day shorter in the iron-deficient group (80 (77–82 [9–85]) days vs. 81 (79–83 [0–85]) days, p = 0.026). In multivariable analysis, only cardiopulmonary bypass duration (p = 0.032) and intra-operative allogeneic red blood cell transfusion (p = 0.011) were significantly associated with reduced days alive and out of hospital at postoperative day 90. Iron deficiency did not exert any adverse influence on secondary outcomes except length of hospital stay. Our findings indicate that non-anaemic iron deficiency alone is not associated with adverse effects in patients undergoing valvular heart surgery when it does not translate into an increased risk of allogeneic transfusion.  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