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   1503篇
  免费   79篇
  国内免费   3篇
耳鼻咽喉   54篇
儿科学   71篇
妇产科学   58篇
基础医学   134篇
口腔科学   41篇
临床医学   112篇
内科学   452篇
皮肤病学   25篇
神经病学   61篇
特种医学   47篇
外科学   304篇
综合类   14篇
预防医学   45篇
眼科学   105篇
药学   41篇
肿瘤学   21篇
  2023年   8篇
  2022年   17篇
  2021年   38篇
  2020年   28篇
  2019年   31篇
  2018年   42篇
  2017年   30篇
  2016年   39篇
  2015年   61篇
  2014年   55篇
  2013年   69篇
  2012年   90篇
  2011年   79篇
  2010年   46篇
  2009年   40篇
  2008年   80篇
  2007年   80篇
  2006年   94篇
  2005年   73篇
  2004年   65篇
  2003年   48篇
  2002年   53篇
  2001年   34篇
  2000年   34篇
  1999年   31篇
  1998年   13篇
  1996年   5篇
  1995年   8篇
  1994年   6篇
  1993年   5篇
  1992年   24篇
  1991年   29篇
  1990年   21篇
  1989年   24篇
  1988年   13篇
  1987年   14篇
  1986年   16篇
  1985年   11篇
  1984年   11篇
  1983年   5篇
  1982年   6篇
  1979年   17篇
  1978年   11篇
  1977年   6篇
  1974年   6篇
  1973年   7篇
  1971年   6篇
  1969年   7篇
  1967年   8篇
  1965年   5篇
排序方式: 共有1585条查询结果,搜索用时 15 毫秒
21.
Clinical Rheumatology - Autoimmune pancreatitis (AIP) type 1 is an IgG4-related disease (IgG4-RD), characterized by inflammatory pseudotumors and histologically by dense lymphoplasmacytic...  相似文献   
22.
454 cases of aortic valve replacement were studied: 217 had no significant coronary artery disease, 197 had associated aorto-coronary bypass surgery and 40 coronary artery disease without revascularization surgery:-- The early mortality in the three groups was 5.5%, 21% and 12.5% respectively, the only statistically significant difference being between the first two groups. -- The coronary artery disease was signigicantly more severe in the group which underwent associated aorto-coronary bypass surgery. The early mortality was significantly raised in the group without bypass surgery in cases with severe coronary artery disease (28%) and in the group with bypass surgery with unsuitable coronary artery lesions (35.5%). On the other hand, the long term survival and functional capacity of patients who underwent associated bypass surgery approached that of the non-coronary patients. Combined aortic valve replacement and coronary bypass surgery should therefore be continued in selected cases.  相似文献   
23.
A case of a traumatic aorto-right ventricular fistula associated with an aortic valve injury and subsequent successful treatment is reported. A possible delay in diagnosis necessitates follow-up of patients after penetrating thoracic wounds. Early surgical treatment is mandatory because of the risks of both heart failure and endocarditis and because of the low operative morbidity. An aortic approach appears to be preferable because it permits repair of both the fistula and the valvular injury. Reconstruction of valvular injuries is preferable since long-term competence without prosthetic replacement can be achieved.  相似文献   
24.
In a 53-years old patient complaining of dyspnoea and angina of effort, the coronary arteriography demonstrated ab abnormal implantation of the pulmonary artery into the left coronary-artery. Correlated with the 39 cases of the adolescent and the adult published in the literature, the case reported has some peculiarities: poorness of the auscultatory signs consisting in a mild apical systolic murmur; electrocardiographic pattern of left complete bundle-branch block; presence of massive calcifications visible by X-ray into the lateral, wall of the left ventricle. Coronary arteriography and catherization made it possible to demonstrate a left-to-right shunt by backward-flow revascularization of the left coronary artery starting from the right coronary artery. A simple suture of the implantation foramen of the abnomal coronary artery resulted in increased pressure into this artery and was followed by disappearance of angina during an observation period of 5 months.  相似文献   
25.
26.
27.
Coronary revascularisation by bilateral internal mammary artery grafting was performed in 39 patients. The left internal mammary was anastomosed to the left anterior descending (N = 22), the left lateral (N = 12) or diagonal artery (N = 5). The right internal mammary was implanted on the right coronary (N = 17), the left anterior descending (N = 16), the left lateral (N = 3) or diagonal artery (N = 3). In two cases, the inferior myocardial segments were revascularised by grafting the gastroepiploic artery. Three patients died and one patient had signs of postoperative myocardial infarction. Respiratory complications, usually mild, occurred in 5 patients. Bilateral internal mammary artery grafting should be reserved for: 1) young patients, 2) those without usable leg veins (varicose veins, previous stripping or coronary bypass surgery). The gastroepiploic artery is a useful arterial graft for revascularizing regions of the heart inaccessible to the internal mammary arteries.  相似文献   
28.
BACKGROUND: Transcatheter closure of atrial septal defect (ASD) is an alternative approach to surgery in selected patients. Balloon stretched diameter (BSD) is considered as the standard way of measuring ASD size. Three-dimensional transesophageal echocardiography (3D-TEE) provides views of the ASD allowing its measurement and identifying its spatial relation with neighboring structures. Our aim was to compare the BSD and 3D-TEE methods to measure the ASD size before transcatheter closure. METHODS AND RESULTS: Seventy-six consecutive patients were enrolled for ASD device closure. Three-dimensional transesophageal echocardiography and balloon sizing were adequately performed in 70 patients before the defect closure. The mean maximal diameter measured by 3D-TEE was 20 +/- 15 mm (range 10-28) while the mean BSD was 22 +/- 4.8 mm (range 9-31). When comparing the 3D-TEE and transcatheter measurements, there was a good correlation between the two methods (y = 3.15 + 0.77x; r = 0.8). The defect as viewed by 3D-TEE was unique in 54 patients and multiple in 16 patients. In patients with a single defect, the correlation between the two methods was high (y = 1.74 + 0.84x; r = 0.85) while patients with multiple ASDs, the correlation was poor (y = 12.4 + 0.4x; r = 0.45). Transcatheter closure was performed successfully in 86%. The mean size of the Amplatzer device was 23 +/- 4.8 mm (range 4-32). The reference to choose the size of the device was the BSD in single defects and the 3D-TEE maximal diameter in multiple defects. CONCLUSION: Three-dimensional transesophageal echocardiography and transcatheter methods are two complementary techniques for the success of transcatheter ASDs closure.  相似文献   
29.
30.
Cardiovascular complications in Turner's syndrome are the most common cause of excess early mortality, with a life expectancy that may be reduced by more than 10 years. Congenital cardiac abnormalities are described in approximately one third of patients. These abnormalities are mostly left heart obstructions, the most common of which are bicuspid aortic valve (16%) and coarctation of the aorta (11%). Dilatations of the ascending aorta are often described and may occur in isolation from any heart disease, suggesting a vasculopathy specific to the syndrome, probably predisposed to by extracardiac risk factors such as oestrogen deficiency, diabetes, dysplidaemia and overweight. The most feared complication is aortic dissection with around a 100 cases, described at average age of approximately 35-years-old. This is believed to complicate 2% of induced pregnancies. Hypertension (HBP) usually essential, affects up to 50% of patients with Turner's syndrome. This is an important risk factor for cardiovascular complications and justifies aggressive treatment. On the other hand, retrospective studies have not demonstrated adverse cardiological effects due to growth hormone treatments. Patients with Turner's syndrome merit regular cardiology follow-up from childhood onwards, particularly if they have treated heart disease. The merits of preventative treatments for aortic dilatation have not been demonstrated in Turner's syndrome and justify prospective trials.  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