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   166568篇
  免费   31651篇
  国内免费   2424篇
耳鼻咽喉   6100篇
儿科学   5850篇
妇产科学   3533篇
基础医学   5026篇
口腔科学   1569篇
临床医学   27431篇
内科学   50638篇
皮肤病学   7591篇
神经病学   16500篇
特种医学   6638篇
外科学   41859篇
综合类   262篇
现状与发展   72篇
一般理论   1篇
预防医学   8134篇
眼科学   3870篇
药学   3368篇
中国医学   45篇
肿瘤学   12156篇
  2024年   697篇
  2023年   4853篇
  2022年   1329篇
  2021年   3348篇
  2020年   6150篇
  2019年   2396篇
  2018年   7895篇
  2017年   7678篇
  2016年   8778篇
  2015年   8706篇
  2014年   16022篇
  2013年   16477篇
  2012年   6434篇
  2011年   6704篇
  2010年   10980篇
  2009年   14486篇
  2008年   6542篇
  2007年   5127篇
  2006年   7647篇
  2005年   4888篇
  2004年   4243篇
  2003年   3223篇
  2002年   3069篇
  2001年   4235篇
  2000年   3480篇
  1999年   3481篇
  1998年   3729篇
  1997年   3478篇
  1996年   3376篇
  1995年   3220篇
  1994年   1947篇
  1993年   1567篇
  1992年   1379篇
  1991年   1415篇
  1990年   1080篇
  1989年   1179篇
  1988年   1029篇
  1987年   865篇
  1986年   900篇
  1985年   735篇
  1984年   559篇
  1983年   537篇
  1982年   537篇
  1981年   435篇
  1980年   380篇
  1979年   332篇
  1978年   352篇
  1977年   413篇
  1975年   296篇
  1972年   309篇
排序方式: 共有10000条查询结果,搜索用时 14 毫秒
41.
42.
43.
44.
45.
Background contextLarge, prominent osteophytes along the anterior aspect of the cervical spine have been reported as a cause of dysphagia. Improvement of swallowing after surgical resection has been reported in a few case reports with short-term follow-up. The current report describes outcomes of a series of five patients with surgical treatment for this rare disorder, with a long-term follow-up.PurposeTo study the clinical and radiographic outcomes of a case series of patients surgically treated for dysphagia secondary to cervical diffuse idiopathic skeletal hyperostosis (DISH).Study designRetrospective review of a case series.Patient sampleFive cases from a University Hospital.Outcome measuresClinical and imagenological follow-up.MethodsThe records of five patients with dysphagia who had undergone anterior surgical resection of prominent osteophytes secondary to DISH were reviewed. Extrinsic esophageal compression secondary to anterior cervical osteophytes was radiographically confirmed via preoperative barium esophagogram swallowing study. All patients underwent anterior cervical osteophytes resection without fusion. Postoperatively, patients were followed-up clinically and radiographically with routine lateral cervical radiographs.ResultsPreoperative esophagogram showed that the esophageal obstruction was present at one level in three cases and two levels in two cases. The C3–C4 level was involved in three cases, C4–C5 in three cases, and C5–C6 in one case. There were no postoperative complications, including recurrent laryngeal nerve palsy, wound infection, or hematomas. All patients had resolution of dyphagia soon after surgery (within 2 weeks). Postoperative radiographs demonstrated complete removal of osteophytes. At final follow-up, ranging from 1 to 9 years (average 59.8 months, median 53 months), no patients reported recurrence of dysphagia. Final radiographic examination demonstrated minimal regrowth of the osteophytes.ConclusionsAlthough rarely indicated, surgical resection of anterior cervical osteophytes from DISH causing dyphagia produces good clinical and radiographical outcomes. After thorough evaluation to rule out other intrinsic or extrinsic causes of swallowing difficulty, surgical treatment of this uncommon condition might be considered.  相似文献   
46.
47.
48.
49.
50.
Background  Surgical procedures enhance production of pro- and anti-inflammatory cytokines and angiogenic factors that play a pivotal role in the immunological response to surgical trauma and take part in the pathogenesis of tumor growth and adhesions formation. The purpose of the study was to access the influence of low-pressure CO2 pneumoperitoneum on the inflammatory and angiogenic responses during the postoperative period after laparoscopy. Methods  The study group consisted of 40 patients, operated on due to cholelithiasis using standard-pressure (n = 20) and low-pressure (n = 20) CO2 pneumoperitoneum. Serum concentration of interleukin (IL)-6, IL-8, IL-10, vascular endothelial growth factor (VEGF)-A, and endostatin were measured before and at 6, 24, and 48 h after surgery with commercially available enzyme-linked immunosorbent assay (ELISA). Results  Concentrations of IL-6 increased significantly after the operations in both groups. No differences were observed between the groups in regards to IL-6, IL-8, and IL-10 levels. Concentrations of VEGF-A measured at 6 and 48 h were significantly lower in patients who underwent laparoscopies performed with low-pressure pneumoperitoneum. No significant variations were observed in endostatin serum concentration. Concentrations of the studied parameters were not influenced by duration of surgery or by age, gender, or body mass index (BMI) of the patients. Conclusions  The results obtained in our study do not show any significant differences between studied operative procedures with regards to systemic inflammatory response. Changes in the concentrations of VEGF-A and endostatin observed in the studied population may suggest this technique is more favorable with regards to angiogenesis process intensity, along with all its consequences and implications.  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