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   8901篇
  免费   476篇
  国内免费   59篇
耳鼻咽喉   114篇
儿科学   189篇
妇产科学   147篇
基础医学   1279篇
口腔科学   1078篇
临床医学   640篇
内科学   1811篇
皮肤病学   312篇
神经病学   730篇
特种医学   244篇
外科学   858篇
综合类   39篇
一般理论   3篇
预防医学   944篇
眼科学   137篇
药学   553篇
中国医学   80篇
肿瘤学   278篇
  2023年   74篇
  2022年   189篇
  2021年   327篇
  2020年   229篇
  2019年   299篇
  2018年   318篇
  2017年   235篇
  2016年   216篇
  2015年   339篇
  2014年   401篇
  2013年   501篇
  2012年   727篇
  2011年   707篇
  2010年   415篇
  2009年   340篇
  2008年   487篇
  2007年   468篇
  2006年   464篇
  2005年   389篇
  2004年   314篇
  2003年   267篇
  2002年   242篇
  2001年   164篇
  2000年   138篇
  1999年   128篇
  1998年   82篇
  1997年   72篇
  1996年   58篇
  1995年   50篇
  1994年   53篇
  1993年   45篇
  1992年   58篇
  1991年   52篇
  1990年   47篇
  1989年   50篇
  1988年   47篇
  1987年   40篇
  1986年   33篇
  1985年   38篇
  1984年   36篇
  1983年   23篇
  1982年   27篇
  1981年   18篇
  1980年   23篇
  1979年   13篇
  1978年   13篇
  1975年   26篇
  1973年   18篇
  1970年   13篇
  1966年   14篇
排序方式: 共有9436条查询结果,搜索用时 0 毫秒
1.
2.
3.
4.
5.
6.
INTRODUCTION: Transesophageal echocardiography (TEE) has become increasingly useful in the study of patients with suspected pulmonary thromboembolism. OBJECTIVE: The aim of this study was to prospectively evaluate the usefulness of TEE in the study of the distal part of the left pulmonary artery (LPA) as well as the influence of this procedure on total echocardiographic exam duration. METHODOLOGY: A prospective study in two groups of consecutive patients referred for TEE with a one- year interval between evaluation of Group A: 33 patients, 17 male, mean age 54 +/- 24 years, and Group B: 42 patients, 20 male, mean age 48 +/- 27 years (p = NS). The procedure was considered long when it took more than 3 min to evaluate the distal part of the LPA. RESULTS: In group A we were able to visualize the distal part of the LPA in 24 patients (73%) without significant prolongation of total exam duration in 16 patients (48% of group A). In one of the patients with suspected pulmonary thromboembolism thrombi were only observed in the distal part of the LPA. In group B we were able to visualize the distal part of the LPA in 36 patients (86%) without significant prolongation of total exam duration in 26 patients (61% of group B). CONCLUSIONS: 1. Visualization of the distal part of the LPA was possible in more patients, and with TEE time prolongation in less patients, in group B. These differences can be accounted for by the training of the operator in this technique. 2. The importance of visualization of this part of the LPA in guiding treatment in the subset of patients with pulmonary thromboembolism confirms the usefulness of this specific procedure.  相似文献   
7.
8.
Gastrogastric fistula: a possible complication of Roux-en-Y gastric bypass.   总被引:4,自引:0,他引:4  
BACKGROUND: Gastrogastric fistula is a communication between the proximal gastric pouch and the distal gastric remnant, rarely described in the realm of bariatric procedures. The aim of this study was to review the existing literature about this topic and to demonstrate its laparoscopic treatment. METHODS: An extensive literature review found several articles reporting this complication. However, no citation was found describing the steps of the laparoscopic management of this situation. RESULTS: Gastrogastric fistula occurs in up to 6% of Roux-en-Y gastric bypasses. Two theories exist for fistula formation: (1) it is a technical complication derived from the incomplete division of the stomach during the creation of the pouch, and (2) it occurs after a staple-line failure, developing a leak with an abscess, which then drains into the distal stomach forming the fistula. Early symptoms include fever, tachycardia, and abdominal pain. Failure in weight loss is a late clinical sign observed in these patients. Diagnosis is based on radiologic study, upper endoscopy and computed tomography. When identified in the acute postoperative course, laparoscopic treatment is easy. Chronic fistulas are difficult to manage, and the laparoscopic approach is an alternative to open surgery. CONCLUSIONS: Gastrogastric fistula is a possible complication of Roux-en-Y gastric bypass and its laparoscopic treatment is feasible.  相似文献   
9.
Surgical procedures for the mammary region currently are assuming an important role in body-contouring surgery. Enhancement of results is a constant challenge to the plastic surgeon. A simple and efficient maneuver for resection of the breast’s lateral pole based on the mammoplasty technique of Professor Ivo Pitanguy is described. This study realized at the Private Clinic Sérgio Carreir?o, Rio de Janeiro, RJ, Brazil.  相似文献   
10.
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