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   706576篇
  免费   49616篇
  国内免费   1299篇
耳鼻咽喉   9171篇
儿科学   23291篇
妇产科学   17618篇
基础医学   110511篇
口腔科学   19970篇
临床医学   63910篇
内科学   134829篇
皮肤病学   16165篇
神经病学   49523篇
特种医学   25801篇
外国民族医学   76篇
外科学   104702篇
综合类   14822篇
现状与发展   2篇
一般理论   160篇
预防医学   51423篇
眼科学   16400篇
药学   53987篇
  3篇
中国医学   2363篇
肿瘤学   42764篇
  2021年   5454篇
  2018年   7879篇
  2017年   6118篇
  2016年   6838篇
  2015年   7571篇
  2014年   10297篇
  2013年   15416篇
  2012年   20566篇
  2011年   21559篇
  2010年   12763篇
  2009年   11966篇
  2008年   20044篇
  2007年   21597篇
  2006年   21962篇
  2005年   20503篇
  2004年   20045篇
  2003年   19001篇
  2002年   18507篇
  2001年   36384篇
  2000年   36960篇
  1999年   30432篇
  1998年   7895篇
  1997年   6672篇
  1996年   6990篇
  1995年   6640篇
  1994年   6108篇
  1993年   5596篇
  1992年   23012篇
  1991年   22962篇
  1990年   22341篇
  1989年   22102篇
  1988年   20059篇
  1987年   19433篇
  1986年   18486篇
  1985年   17333篇
  1984年   12706篇
  1983年   10751篇
  1982年   5924篇
  1979年   11525篇
  1978年   8131篇
  1977年   6850篇
  1976年   6595篇
  1975年   7272篇
  1974年   8508篇
  1973年   8150篇
  1972年   7662篇
  1971年   7134篇
  1970年   6882篇
  1969年   6317篇
  1968年   5793篇
排序方式: 共有10000条查询结果,搜索用时 9 毫秒
71.
72.
Traditionally, major complications and unanticipated admission/readmission rates were used to assess outcome after day surgery. However, in view of the relative absence of major complications the quality of recovery (QOR) should be considered one of the principal endpoints after day surgery. In our study, the level of QOR is defined by a combination of the Global Surgical Recovery (GSR) Index and the Quality of Life (QOL).The aim of this study was to analyze prevalence and predictors of QOR after day surgery on the fourth postoperative day.Elective patients scheduled for day surgery from November 2008 to April 2010 were enrolled in a prospective cohort study. Outcome parameters were measured by using questionnaire packages at 2 time points: 1 week preoperatively and 4 days postoperatively. Primary outcome parameter is the QOR and is defined as good if the GSR index >80% as well as the postoperative QOL is unchanged or improved as compared with baseline. QOR is defined as poor if both the GSR index ≤80% and if the postoperative QOL is decreased as compared with baseline. QOR is defined as intermediate in all other cases. Three logistic regression analyses were performed to determine predictors for poor QOR after day surgery.A total of 1118 patients were included. A good QOR was noted in 17.3% of patients, an intermediate QOR in 34.8%, and a poor QOR in 47.8% 4 days after day surgery. The best predictor for poor QOR after day surgery was type of surgery. Other predictors were younger age, work status, and longer duration of surgery. A history of previous surgery, expected pain (by the patient) and high long-term surgical fear were significant predictors of poor QOR in only 1 of 3 prediction models.The QOR at home 4 days after day surgery was poor in the majority of patients and showed a significant procedure-specific variation. Patients at risk for poor QOR can be identified during the preoperative period based on type of surgery, age, work status, and the duration of the surgery.  相似文献   
73.
74.
75.
76.
77.
78.
79.

Aims

Variations of the anatomy of donor hepatic arteries increase the number of arterial anastomoses during liver transplantation and, possibly, the incidence of hepatic artery thrombosis (HAT). In this study, we describe the arterial anatomic variations in liver grafts procured and transplanted by a single center in Greece, the techniques of arterial anastomosis, and their effect on the incidence of early HAT.

Materials and Methods

From January 2013 to December 2017, the arterial anatomy of 116 grafts procured for liver transplantation were recorded, as well as the technique of arterial anastomosis and the incidence of early hepatic artery thrombosis (HAT <30 days).

Results

A single hepatic artery was recorded in 72.41% of the procured grafts, an aberrant left hepatic artery (accessory or replaced) in 18 grafts (15.52%), and an aberrant right hepatic artery (accessory or replaced) in 17 grafts (14.66%), while other variations were observed in less than 1% of the procured livers. Of the 116 primary liver transplantations, 6 patients (5.17%) developed early HAT <30 days. Two of these patients (1.72%) had 1 anastomosis of the hepatic artery and 4 (3.45%) had 2 anastomoses due to anatomic variations.

Conclusions

Anatomic variations of the hepatic artery in liver grafts is a common finding and increase the incidence of early HAT but not to a degree to make these grafts unusable.  相似文献   
80.
Hawi  N.  von Falck  C.  Krettek  C.  Meller  R. 《Der Unfallchirurg》2019,122(12):944-949
Die Unfallchirurgie - Zur Diagnostik von Schultergelenkerkrankungen wird routinemäßig die Magnetresonanztomographie (MRT) durchgeführt. Diese kann entsprechend der klinischen...  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