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   1698篇
  免费   280篇
  国内免费   37篇
耳鼻咽喉   13篇
儿科学   101篇
妇产科学   19篇
基础医学   86篇
口腔科学   26篇
临床医学   278篇
内科学   575篇
皮肤病学   61篇
神经病学   171篇
特种医学   297篇
外科学   182篇
综合类   31篇
预防医学   55篇
眼科学   16篇
药学   51篇
中国医学   1篇
肿瘤学   52篇
  2023年   52篇
  2022年   12篇
  2021年   27篇
  2020年   90篇
  2019年   11篇
  2018年   88篇
  2017年   69篇
  2016年   67篇
  2015年   60篇
  2014年   94篇
  2013年   109篇
  2012年   43篇
  2011年   35篇
  2010年   76篇
  2009年   108篇
  2008年   41篇
  2007年   44篇
  2006年   43篇
  2005年   25篇
  2004年   13篇
  2003年   13篇
  2002年   15篇
  2001年   29篇
  2000年   12篇
  1999年   24篇
  1998年   80篇
  1997年   95篇
  1996年   78篇
  1995年   68篇
  1994年   49篇
  1993年   52篇
  1992年   26篇
  1991年   14篇
  1990年   27篇
  1989年   55篇
  1988年   43篇
  1987年   27篇
  1986年   22篇
  1985年   21篇
  1984年   18篇
  1983年   9篇
  1982年   14篇
  1981年   14篇
  1980年   14篇
  1979年   8篇
  1978年   8篇
  1977年   10篇
  1976年   10篇
  1975年   7篇
  1971年   8篇
排序方式: 共有2015条查询结果,搜索用时 15 毫秒
1.
2.
We present a case of type B aortic dissection with a rare aortic arch branching variation whereby two separate brachiocephalic trunks arise from the arch. This case also highlights the potential implications of this variant in the management of thoracic aortic dissections and aneurysms.  相似文献   
3.
Rupture of sinus of valsalva following repair of tetralogy of fallot (TOF) is very rare. It should be suspected as a cause of recurrent or prolonged pleural effusion and congestive cardiac failure in patients who have undergone repair of TOF. We report one such patient.  相似文献   
4.
Saline contrast echocardiography is a simple and effective method to diagnose the presence and type of right-to-left shunt in patients with unexplained cyanosis. It is considered a very sensitive test to diagnose pulmonary arteriovenous malformations. Our patient presented with unexplained cyanosis and transthoracic echocardiography showed an atrial septal defect and anomalous pulmonary venous drainage of the right and left upper pulmonary veins to the superior venacava. We describe how we used saline contrast echocardiography to demonstrate the presence of pulmonary arteriovenous malformations even in the presence of atrial septal defect and anomalous pulmonary venous drainage.  相似文献   
5.
We present images from computed tomography angiography in a 40-year-old female with a calcified pseudo-aneurysm in her left coronary artery, who had previously undergone repair of tetralogy of Fallot.  相似文献   
6.
7.
8.
Iliac vessels are prone to injury during lumbar spine surgery due to their proximity to the lumbar spine. Arterio‐venous fistula formation during lumbar spine surgery is an uncommon complication and can present as an asymptomatic incidental finding to rapidly deteriorating hemodynamics leading to cardiopulmonary collapse. We have reported three patients who had symptomatic iliac arterio‐venous fistula detected soon after lumbar spine surgery. All these patients were successfully treated by endovascular transluminal stent grafting. © 2013 Wiley Periodicals, Inc.  相似文献   
9.
AIM: To assess whether reasons for hepatitis C virus(HCV) therapy non-initiation differentially affect racial and ethnic minorities with human immunodeficiency virus(HIV)/HCV co-infection.METHODS: Analysis included co-infected HCV treatment-na?ve patients in the University of North Carolina CFAR HIV Clinical Cohort(January 1, 2004 and December31, 2011). Medical records were abstracted to document non-modifiable medical(e.g., hepatic decompensation, advanced immunosuppression), potentially modifiable medical(e.g., substance abuse, severe depression, psychiatric illness), and non-medical(e.g., personal,social, and economic factors) reasons for non-initiation. Statistical differences in the prevalence of reasons for non-treatment between racial/ethnic groups were assessed using the two-tailed Fisher's exact test. Three separate regression models were fit for each reason category. Odds ratios and their 95%CIs(Wald's) were computed.RESULTS: One hundred and seventy-one patients with HIV/HCV co-infection within the cohort met study inclusion. The study sample was racially and ethnically diverse; most patients were African-American(74%), followed by Caucasian(19%), and Hispanic/other(7%). The median age was 46 years(interquartile range = 39-50) and most patients were male(74%). Among the 171 patients, reasons for non-treatment were common among all patients, regardless of race/ethnicity(50% with ≥ 1 non-modifiable medical reason, 66% with ≥1 potentially modifiable medical reason, and 66% with ≥ 1 non-medical reason). There were no significant differences by race/ethnicity. Compared to Caucasians, African-Americans did not have increased odds of nonmodifiable [adjusted odds ratio(a OR) = 1.47, 95%CI: 0.57-3.80], potentially modifiable(a OR = 0.72, 95%CI: 0.25-2.09) or non-medical(a OR = 0.90, 95%CI: 0.32-2.52) reasons for non-initiation.CONCLUSION: Race/ethnicity alone is not predictive of reasons for HCV therapy non-initiation. Targeted interventions are needed to improve access to therapy for all co-infected patients, including minorities.  相似文献   
10.
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