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   25223篇
  免费   2146篇
  国内免费   636篇
耳鼻咽喉   8篇
儿科学   498篇
妇产科学   127篇
基础医学   1644篇
口腔科学   23篇
临床医学   4832篇
内科学   9681篇
皮肤病学   40篇
神经病学   415篇
特种医学   1230篇
外国民族医学   1篇
外科学   3094篇
综合类   3069篇
现状与发展   1篇
预防医学   500篇
眼科学   20篇
药学   1835篇
  23篇
中国医学   641篇
肿瘤学   323篇
  2024年   39篇
  2023年   525篇
  2022年   724篇
  2021年   1165篇
  2020年   1279篇
  2019年   1252篇
  2018年   1177篇
  2017年   891篇
  2016年   778篇
  2015年   942篇
  2014年   1722篇
  2013年   1889篇
  2012年   1177篇
  2011年   1347篇
  2010年   1032篇
  2009年   1095篇
  2008年   1071篇
  2007年   1070篇
  2006年   998篇
  2005年   895篇
  2004年   706篇
  2003年   621篇
  2002年   505篇
  2001年   499篇
  2000年   347篇
  1999年   426篇
  1998年   370篇
  1997年   373篇
  1996年   296篇
  1995年   303篇
  1994年   287篇
  1993年   234篇
  1992年   224篇
  1991年   227篇
  1990年   181篇
  1989年   125篇
  1988年   139篇
  1987年   131篇
  1986年   113篇
  1985年   154篇
  1984年   140篇
  1983年   99篇
  1982年   70篇
  1981年   92篇
  1980年   68篇
  1979年   45篇
  1978年   41篇
  1977年   39篇
  1976年   30篇
  1975年   17篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
2.
3.
Central illustration: cumulative major adverse cardiac events (MACE) and bioresorbable vascular scaffold (BVS) thrombosis rates after 1, 2, 3, 4 and 5 years.
  相似文献   
4.
5.
This article was designed to provide a pediatric cardiac computed tomography angiography (CCTA) expert panel consensus based on opinions of experts of the Société Française d’Imagerie Cardiaque et Vasculaire diagnostique et interventionnelle (SFICV) and of the Filiale de Cardiologie Pédiatrique Congénitale (FCPC). This expert panel consensus includes recommendations for indications, patient preparation, CTA radiation dose reduction techniques, and post-processing techniques. The consensus was based on data from available literature (original papers, reviews and guidelines) and on opinions of a group of specialists with extensive experience in the use of CT imaging in congenital heart disease. In order to reach high potential and avoid pitfalls, CCTA in children with congenital heart disease requires training and experience. Moreover, pediatric cardiac CCTA protocols should be standardized to acquire optimal images in this population with the lowest radiation dose possible to prevent unnecessary radiation exposure. We also provided a suggested structured report and a list of acquisition protocols and technical parameters in relation to specific vendors.  相似文献   
6.
7.
8.
9.
Anomalous origin of the left coronary artery from the pulmonary artery (ALCAPA) is a rare congenital condition. It responds well to early diagnosis and treatment, but otherwise the prognosis is poor. We present our case series of 12 patients (mean age, 2 ± 2.58 yr; age range, 2 mo–8 yr), emphasizing the diagnostic process and discussing our surgical results. The diagnosis of ALCAPA should be suspected in infants who have dilated cardiomyopathy with electrocardiographic changes that suggest ischemia, and in older children who have isolated mitral regurgitation. When clinical suspicion is high, the results of 2-dimensional echocardiography combined with color-flow Doppler studies in expert hands can establish the diagnosis, thus avoiding angiography in critically ill infants. The treatment of choice in our patients was transfer and reimplantation of the left coronary artery onto the ascending aorta. There were 2 deaths: both were infants in extremis who underwent emergency surgery. An older child with severe ventricular dysfunction was given mechanical ventricular assistance and then heart transplantation. As of this report, all 10 survivors remained well and asymptomatic.  相似文献   
10.
ObjectiveTo investigate the association between type 1 diabetes mellitus (T1D) and type 2 diabetes mellitus (T2D) with risk of sudden cardiac arrest (SCA).MethodsIn a prospective community-based study of SCA from February 1, 2002, through November 30, 2019, we ascertained 2771 cases age 18 years of age or older and matched them to 8313 controls based on geography, age, sex, and race/ethnicity. We used logistic regression to evaluate the independent association between diabetes, T1D, T2D, and SCA.ResultsPatients had a mean age of 64.5±15.9 years, were 33.3% female and 23.9% non-White race. Overall, 36.7% (n=1016) of cases and 23.8% (n=1981) of controls had diabetes. Among individuals with diabetes, the proportion of T1D was 6.5% (n=66) among cases and 2.0% among controls (n=40). Diabetes was associated with 1.5-times higher odds of SCA. Compared with those without diabetes, the odds ratio and 95% CI for SCA was 4.36 (95% CI, 2.81 to 6.75; P<.001) in T1D and 1.45 (95% CI, 1.30 to 1.63; P<.001) in T2D after multivariable adjustment. Among those with diabetes, the odds of having SCA were 2.41 times higher in T1D than in T2D (95% CI, 1.53 to 3.80; P<.001). Cases of SCA with T1D were more likely to have an unwitnessed arrest, less likely to receive resuscitation, and less likely to survive compared with those with T2D.ConclusionType 1 diabetes was more strongly associated with SCA compared with T2D and had less favorable outcomes following resuscitation. Diabetes type could influence the approach to risk stratification and prevention of SCA.  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