首页 | 官方网站   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   1191篇
  免费   75篇
  国内免费   5篇
医药卫生   1271篇
  2024年   3篇
  2023年   21篇
  2022年   32篇
  2021年   46篇
  2020年   26篇
  2019年   58篇
  2018年   56篇
  2017年   33篇
  2016年   42篇
  2015年   35篇
  2014年   57篇
  2013年   80篇
  2012年   100篇
  2011年   115篇
  2010年   84篇
  2009年   47篇
  2008年   91篇
  2007年   65篇
  2006年   54篇
  2005年   65篇
  2004年   49篇
  2003年   38篇
  2002年   21篇
  2001年   5篇
  2000年   2篇
  1999年   5篇
  1998年   5篇
  1997年   5篇
  1996年   2篇
  1995年   5篇
  1994年   5篇
  1993年   3篇
  1992年   1篇
  1990年   1篇
  1986年   1篇
  1984年   1篇
  1983年   1篇
  1982年   5篇
  1964年   1篇
  1963年   1篇
  1961年   1篇
  1959年   1篇
  1957年   1篇
  1931年   1篇
排序方式: 共有1271条查询结果,搜索用时 0 毫秒
21.
22.
23.
The aim of this study was to compare the results obtained with an indium-111 scan with those obtained with less expensive and harmless ultrasonography to evaluate the location and inflammatory activity of Crohn's disease. Thirty-one patients previously studied with x-ray underwent abdominal111In scans and ultrasonography (US). Sensitivity and specificity of US in detecting lesions seen with111In scan were 77% and 92.8%, respectively. Sensitivity and specificity of111In scan in detecting x-ray-defined lesions were 69.2% and 92.7%; the figures for US were 73% and 93.3%, respectively. Considering the evaluation of disease activity, ultrasonographic bowel wall thickness was significantly related to scintigraphic intensity of emission (r=0.75 P<0.01). Our experience suggests that US provided information about the location and inflammatory activity of lesions similar to that obtained from111In scan.  相似文献   
24.
25.
26.
27.
Sport Sciences for Health - The generalized joint hypermobility (GJH) syndrome is a condition characterized by a connective tissue disorder that may negatively affect the muscle function and muscle...  相似文献   
28.
Background: Recently the new specific phosphodiesterase-5 inhibitor sildenafil was introduced into therapy for erectile dysfunction. The hemodynamic effects of sildenafil may be potentially hazardous for patients with cardiac disease. Sildenafil has been reported to augment the hypotensive effects of nitrates. There is sparse information regarding the systemic and pulmonary hemodynamic effects of a single oral dose of sildenafil in patients with stable angina. Methods: Male patients referred for coronary angiography with diagnosis of chronic stable angina were enrolled in this study to assess the acute hemodynamic effects of sildenafil. Patients receiving long-acting or sublingual nitrates for the last 6 h before the study were excluded. Hemodynamic measurement were taken during right and left heart catheterization in the basal state and 60 min after 50 mg of oral sildenafil. Results: Twelve patients (age 53±7 years) were studied. All had stable angina CCS class II or III. Four had previous myocardial infarction. By coronary angiography, seven patients had at least one coronary artery with >70% stenosis, four had at least one with 50–70% stenosis, and one had only intimal irregularities. There were no significant effects of sildenafil on systemic or pulmonary arterial pressure, left ventricle endiastolic pressure, cardiac output, and systemic or pulmonary vascular resistance (P>0.05 for all). No adverse events were observed. Conclusion: A single oral dose of sildenafil had no significant hemodynamic effect in supine patients with stable angina. Isolated administration of sildenafil does not appear to be associated to adverse cardiovascular effects.  相似文献   
29.
30.
An 18-year-old female lost the majority of her central vision over the course of three months in 1959. Medical records from 1960 indicate visual acuities (VA) of less than 20/400 for both eyes corresponding to legal blindness. On fundus examination of the eye there were dense yellowish-white areas of atrophy in each fovea and the individual was diagnosed with juvenile macular degeneration (JMD). In 1971, another examination recorded her uncorrected VA as finger counting on the right and hand motion on the left. She was diagnosed with macular degeneration (MD) and declared legally blind. In 1972, having been blind for over 12 years, the individual reportedly regained her vision instantaneously after receiving proximal-intercessory-prayer (PIP). Subsequent medical records document repeated substantial improvement; including uncorrected VA of 20/100 in each eye in 1974 and corrected VAs of 20/30 to 20/40 were recorded from 2001 to 2017. To date, her eyesight has remained intact for forty-seven years.  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-23

京公网安备 11010802026262号