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   767篇
  免费   36篇
  国内免费   5篇
耳鼻咽喉   5篇
儿科学   40篇
妇产科学   28篇
基础医学   66篇
口腔科学   58篇
临床医学   43篇
内科学   127篇
皮肤病学   7篇
神经病学   38篇
特种医学   42篇
外科学   239篇
综合类   3篇
预防医学   16篇
眼科学   55篇
药学   23篇
中国医学   1篇
肿瘤学   17篇
  2023年   3篇
  2022年   15篇
  2021年   28篇
  2020年   16篇
  2019年   20篇
  2018年   20篇
  2017年   19篇
  2016年   15篇
  2015年   30篇
  2014年   36篇
  2013年   44篇
  2012年   55篇
  2011年   62篇
  2010年   35篇
  2009年   38篇
  2008年   52篇
  2007年   66篇
  2006年   51篇
  2005年   63篇
  2004年   38篇
  2003年   30篇
  2002年   32篇
  2001年   2篇
  2000年   5篇
  1999年   1篇
  1998年   3篇
  1997年   5篇
  1996年   4篇
  1995年   5篇
  1994年   2篇
  1993年   1篇
  1992年   4篇
  1991年   1篇
  1984年   1篇
  1982年   1篇
  1980年   1篇
  1974年   2篇
  1972年   1篇
  1971年   1篇
排序方式: 共有808条查询结果,搜索用时 31 毫秒
21.
22.
Sjögren’s syndrome is primarily a chronic systemic autoimmune disease that affects exocrine organs. Neurologic symptoms frequently present as peripheral neuropathy due to small vessel vasculitis. Type and prevalence of central nervous system involvement are still controversial. In this report, we present a 35-year-old woman with primary Sjögren’s syndrome with central nervous system vasculitic involvement.  相似文献   
23.
24.
25.
Acute renal failure (ARF) is a major complication in infants who undergo cardiac surgery. The aim of this investigation was to identify possible risk factors for ARF and mortality in this patients group. Out of 64 patients, 21 (32.8%) cases developed acute renal failure and overall mortality rate was 25%. The mortality rate was higher in the infants who developed ARF than those who did not (66.7% and 4.7%, respectively, p < 0.05). Also, ARF was positively correlated with mortality (r:0.70, p < 0.0001). The nonsurvivors had lower mean serum albumin than did the survivors (p < 0.05), and serum albumin level was negatively correlated with mortality (r = ? 0.34, p < 0.05). For the patients with serum albumin level < 3.5 g/dL, the unadjusted odds ratio for mortality was 4.3 (CI 95%:1.05 ? 17.86). Total bypass time and aorta clamping time were significantly longer in the nonsurvivor group than in the survivor group (p < 0.05 for both). In conclusion, the significant risk factors for mortality in these patients were development of ARF, low serum albumin level, and long total bypass and aorta clamping times, which may be predictive of poor prognosis.  相似文献   
26.
Background/aims. Ideal time needed for arteriovenous fistula (AVF) maturation is still controversial. In this study, we aimed to investigate the natural course of AVF maturation and also investigated the factors affecting AVF maturation. Methods. We studied 31 (21M/10F, mean age 55.8 ± 16.2) chronic renal failure patients. We evaluated the patients with color Doppler ultrasound examination before the fistula operation, at the first day, and at the first, second, third, and sixth months. Radial artery (RA) diameter, flow velocity, flow, resistance index, fistula vein diameter, flow velocity, and flow were measured. Results. Patency rates at the first post-operative day and the sixth month were 87.1% and 67.1%, respectively. Cephalic vein flow was 451.2 ± 248.6 mL/min at the first month and 528.6 ± 316.5 mL/min at the sixth month. Baseline RA diameter was lower in failing fistulas than that of patent fistulas. Failing fistulas were more common in women. Conclusion. Blood flow was enough for hemodialysis at the end of the first month. However, fistula maturation had continued until the end of the study; women and patients with low RA diameter are particularly prone to fistula failure. Therefore, especially in these patients, AVF must be created at least three or four months before the predicted hemodialysis initiation time.  相似文献   
27.
28.
Journal of Neurology - Vestibular migraine (VM) is one of the most common causes of vertigo in clinical practice but it is not always easy to make the correct diagnosis. Our aims were to find out...  相似文献   
29.
Hellenic Journal of Surgery - With the increasing use of imaging methods, there has been an increase in the number of patients diagnosed with gallbladder polyp. In patients undergoing...  相似文献   
30.
Thoracostomy tube placement (TT) is currently one of the most important treatment modalities used in traumatic pneumothorax patients. In patients with low pneumothorax ratio (percentage), both follow-up without surgery and employing intervention when indicated may be appropriate choice. We presented the outcome of patients with low traumatic pneumothorax ratio treated by follow up without surgical intervention in our clinic. During the period from January 2000 until January 2002, 108 patients who were treated and followed with low percentage traumatic pneumothorax in Ankara Numune Hospital Thoracic Surgery Clinic were allocated into three groups due to blunt trauma of the thorax, penetrating-cutting instrument injury and gunshot injury. All patients were admitted to the clinic with the purpose of observation without surgical intervention and chest roentgenograms were taken at the sixth and twelfth hours and daily thereafter. TT was performed for 46 (43%) patients whose pneumothorax ratio increased during the observation period. TT was more frequent in patients with 20% percentage pneumothorax (69%) as well as with two or more fractured ribs (69%). Follow-up without surgical intervention may one of the appropriate modes of treatment in patients who have minimal traumatic pneumothorax.  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