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   1683篇
  免费   289篇
  国内免费   39篇
耳鼻咽喉   13篇
儿科学   101篇
妇产科学   19篇
基础医学   90篇
口腔科学   26篇
临床医学   281篇
内科学   576篇
皮肤病学   60篇
神经病学   172篇
特种医学   279篇
外科学   185篇
综合类   31篇
预防医学   55篇
眼科学   16篇
药学   53篇
中国医学   1篇
肿瘤学   53篇
  2024年   9篇
  2023年   52篇
  2022年   13篇
  2021年   27篇
  2020年   90篇
  2019年   12篇
  2018年   88篇
  2017年   69篇
  2016年   68篇
  2015年   60篇
  2014年   94篇
  2013年   109篇
  2012年   44篇
  2011年   35篇
  2010年   76篇
  2009年   108篇
  2008年   41篇
  2007年   44篇
  2006年   42篇
  2005年   25篇
  2004年   13篇
  2003年   11篇
  2002年   14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   25篇
  1989年   52篇
  1988年   42篇
  1987年   26篇
  1986年   20篇
  1985年   20篇
  1984年   16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   9篇
  1976年   10篇
  1971年   8篇
排序方式: 共有2011条查询结果,搜索用时 0 毫秒
81.
82.
A 12‐year‐old child presented with recurrent respiratory infections and was diagnosed with Scimitar syndrome. Drainage of IVC and course of aberrant arterial supply from aorta were not clear by echocardiogram, and hence, additional imaging was planned. CT unraveled the presence of a rare combination of anomalous pulmonary venous connection (APVC) to IVC, with near‐atresia/severe stenosis of IVC, superior to the drainage of scimitar vein. There was a prominent azygos vein with preferential contrast opacification on lower limb injection.  相似文献   
83.
Intermittent dysfunction of mechanical mitral valve prosthesis is an uncommon condition. It carries serious clinical implications if unrecognized. Here, we present a case of a 28‐year‐old female with a history of rheumatic multivalvular disease, for which she had undergone double valve replacement and tricuspid annuloplasty. Six months later, she presented with heart failure. Clinical examination revealed intermittent loss of closing clicks followed by a pansystolic murmur at the apex, suggestive of mitral prosthetic valve dysfunction. We highlight the echocardiographic findings of paroxysmal mitral valvular regurgitation secondary to prosthetic valve malfunction secondary to prosthetic valve thrombosis.  相似文献   
84.
Patients with large sub-pulmonic ventricular septal defect (VSD) present early as a results of their complications. Some present late, due to the restriction of VSD by the right coronary cusp (RCC) due to its prolapse. In this report, we present a rare case of sub-pulmonic VSD in a 33-year-old man who developed a sub-pulmonic stenosis due to the prolapse of the RCC into the right ventricular outflow tract.  相似文献   
85.
Accurate assessment of etiology of mitral regurgitation (MR) is one of the key steps in the decision-making process and further clinical management of patients with severe MR. Our clinical case illustrates the added value of three-dimensional echocardiography (3DE) in assessment of mitral valve morphology and identification of an unexpected mechanism of MR which was not previously diagnosed using conventional echocardiography. 3DE helped to choose appropriate management strategy in this patient.  相似文献   
86.
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   
87.
In cor triatriatum sinister, the left atrium is divided by a membrane into a proximal and a distal chamber. Usually proximal chamber receives all the pulmonary veins and drains through an opening in the dividing membrane into distal chamber, which empties into left ventricle through the mitral valve. Rarely, the two chambers lack a communication and there is associated total anomalous pulmonary venous connection (TAPVC). We report a 1-month-old infant with cyanosis and heart failure, who had cor triatriatum sinister associated with supracardiac TAPVC. The case is reported for rarity of the association with a focus on contrast echocardiographic imaging.  相似文献   
88.
89.
The authors assessed whether individuals with elevated body mass index (BMI) and hypertension had more difficult‐to‐control blood pressure (BP) and more evidence of end organ damage using data collected prospectively over 11 years from a secondary care hypertension clinic. A total of 1114 individuals were divided by BMI criteria into normal (n=207), overweight (n=440), and obese (n=467). Mean daytime, nighttime, and 24‐hour systolic BP and diastolic BP were similar in all groups. There was less nocturnal dip in obese compared with overweight groups (P=.025). Individuals with a normal BMI were taking fewer antihypertensive medications than those in the obese group (P=.01). Individuals classified as obese had a higher left ventricular mass index than those with a normal BMI (female, P=.028; male, P<.001); this relationship remained after multivariate linear regression. Obese individuals with hypertension required more medication to achieve similar mean ambulatory BP values, had less nocturnal dip in BP, and had a higher prevalence of left ventricular hypertrophy. As such, obese patients are at potentially increased risk of cardiovascular events.  相似文献   
90.
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