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   38637篇
  免费   2604篇
  国内免费   1241篇
耳鼻咽喉   75篇
儿科学   1174篇
妇产科学   690篇
基础医学   2556篇
口腔科学   87篇
临床医学   4418篇
内科学   11518篇
皮肤病学   178篇
神经病学   1286篇
特种医学   894篇
外国民族医学   1篇
外科学   2823篇
综合类   7189篇
现状与发展   5篇
一般理论   1篇
预防医学   1926篇
眼科学   778篇
药学   4807篇
  27篇
中国医学   1518篇
肿瘤学   531篇
  2023年   514篇
  2022年   568篇
  2021年   1083篇
  2020年   1345篇
  2019年   1159篇
  2018年   1248篇
  2017年   1178篇
  2016年   1254篇
  2015年   1254篇
  2014年   2508篇
  2013年   3499篇
  2012年   2011篇
  2011年   2101篇
  2010年   1841篇
  2009年   1701篇
  2008年   1690篇
  2007年   1854篇
  2006年   1675篇
  2005年   1451篇
  2004年   1362篇
  2003年   1218篇
  2002年   1054篇
  2001年   1003篇
  2000年   835篇
  1999年   714篇
  1998年   593篇
  1997年   628篇
  1996年   532篇
  1995年   583篇
  1994年   488篇
  1993年   370篇
  1992年   386篇
  1991年   306篇
  1990年   263篇
  1989年   225篇
  1988年   237篇
  1987年   224篇
  1986年   192篇
  1985年   239篇
  1984年   215篇
  1983年   112篇
  1982年   147篇
  1981年   143篇
  1980年   146篇
  1979年   85篇
  1978年   58篇
  1977年   53篇
  1976年   44篇
  1974年   18篇
  1973年   20篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
2.
3.
PurposeTo evaluate the midterm outcomes of percutaneous transluminal renal angioplasty (PTRA) for pediatric renovascular hypertension (RVH).Materials and MethodsThe clinical data of patients who underwent PTRA for RVH in the authors’ hospital from 2012 to 2019 were retrospectively analyzed. Postprocedural blood pressure, glomerular filtration rate (GFR) of the affected kidney, restenosis, and complications were closely monitored.ResultsPTRA was performed in a total of 30 children (20 boys and 10 girls), with a mean age of 7.3 years ± 0.7 (range, 40 days to 13.9 years) and a mean weight of 25.0 kg ± 2.3 (range, 3.4–53 kg). The median follow-up period was 26.5 months (range, 1 month to 7.5 years). Technical success was achieved in 26 (86.7%) of the 30 patients. Restenosis developed in 3 patients (10.0%). Only 1 patient underwent stent implantation, and the stent fractured 8 months later, requiring further intervention. There were no other complications. In terms of clinical benefit of blood pressure control after the initial PTRA procedure, 15 patients (50%) were cured and 7 patients (23.3%) showed improvement. There was no significant difference in the etiology, lesion location, and lesion length between patients with clinical benefit and failure (P = .06, P = .202, and P = .06, respectively). GFR of the affected kidney was significantly improved from 19.9 mL/min ± 11.2 to 38.1 mL/min ± 11.9 at the 6-month follow-up after PTRA (P < .001).ConclusionsThe overall results of PTRA for pediatric RVH caused by different etiologies are promising. PTRA not only provided a clinical benefit of blood pressure control in 73.3% of the patients but also significantly improved the function of the affected kidney.  相似文献   
4.
5.
6.
目的 本研究旨在探讨原发性高血压患者脉图参数与心血管危险分层的相关性,为原发性高血压患者心血管风险事件预警提供中医特色的依据。方法 采集435例原发性高血压患者的症状体征、脉象信息、生化指标等,分为低中危组、高危组、很高危组,采用单因素方差分析、秩和检验、有序logistic回归分析等方法,探讨原发性高血压患者脉图参数与心血管危险分层的相关性。结果 ①高血压低中危组→高危组→很高危组患者病程逐渐延长,两两组间比较有统计学差异;②高血压低中危组→高危组→很高危组患者的脉图参数H3/H1、H4/H1逐渐上升;高血压患者很高危组H5/H1、T1/T低于低中危组;③有序logistic回归分析结果显示,脉图参数T1、T4、T5、T为影响因素。结论 病程、血脂、肾功能是高血压患者心血管危险分层的影响因素之一。心血管危险分层等级的升高与脉图参数H3/H1、H4/H1、T5、T的升高及H5/H1、T4、T1的降低相关,说明脉图能一定程度上反映原发性高血压患者血管壁增厚、血管内壁受损、血管硬化及左心室收缩功能的减退程度。  相似文献   
7.
8.
Many environmental risk factors for hepatobiliary cancers are known but whether they are associated with specific cancer types is unclear. We present here a novel approach of assessing standardized incidence ratios (SIRs) of previously diagnosed comorbidities for hepatocellular carcinoma (HCC), gallbladder cancer (GBC), cholangiocarcinoma (CCA) and ampullary cancer. The 13 comorbidities included alcohol and nonalcohol related liver disease, chronic obstructive pulmonary disease, gallstone disease, viral and other kinds of hepatitis, infection of bile ducts, hepatic and other autoimmune diseases, obesity and diabetes. Patients were identified from the Swedish Inpatient Register from 1987 to 2018, and their cancers were followed from 1997 onwards. SIRs for HCC were 80 to 100 in men and women diagnosed with hepatitis C virus and they were also >10 in patients diagnosed with hepatitis B virus, other kind of hepatitis, hepatic autoimmune disease and nonalcohol related liver disease. Many of these risks, as well as alcohol related liver disease, were either specific to HCC or were shared with intrahepatic CCA. For GBC, CCA and ampullary cancer infection of bile ducts was the main risk factor. Gallstone disease, nonhepatic autoimmune diseases and diabetes were associated with all hepatobiliary cancers. The limitations of the study include inability to cover some rare risk factors and limited follow-up time. Many of the considered comorbidities are characterized by chronic inflammation and/or overt immune disturbance in autoimmune diseases. The results suggest that local chronic inflammation and a related immune disturbance is the carcinogenic trigger for all these cancers.  相似文献   
9.
10.
The pulmonary alveolocapillary dysplasia (ACD) with pulmonary vein misalignment (PVM) is a rare condition characterized by a congenital anomaly of the development of the pulmonary parenchyma. We present a case of an 8-month-old infant who died quickly from acute respiratory failure complicating an unknown ACD. We also describe its epidemiological characteristics in infants and we discuss the diagnosis's difficulties. In this case, a pulmonary arterial hypertension was decompensated by an infection. A medico-legal autopsy was performed. As for the Histological examination, it showed the features of ACD/PVM.  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