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   1459460篇
  免费   108885篇
  国内免费   2337篇
耳鼻咽喉   20578篇
儿科学   49618篇
妇产科学   38848篇
基础医学   208965篇
口腔科学   38066篇
临床医学   126609篇
内科学   297269篇
皮肤病学   32681篇
神经病学   117067篇
特种医学   56563篇
外国民族医学   715篇
外科学   219025篇
综合类   27921篇
现状与发展   1篇
一般理论   430篇
预防医学   112367篇
眼科学   31349篇
药学   107971篇
  2篇
中国医学   3006篇
肿瘤学   81631篇
  2021年   10846篇
  2019年   12233篇
  2018年   19126篇
  2017年   13990篇
  2016年   14928篇
  2015年   16916篇
  2014年   21922篇
  2013年   33747篇
  2012年   49409篇
  2011年   51390篇
  2010年   29307篇
  2009年   26696篇
  2008年   47992篇
  2007年   51492篇
  2006年   50627篇
  2005年   49423篇
  2004年   47814篇
  2003年   45830篇
  2002年   44583篇
  2001年   67466篇
  2000年   70005篇
  1999年   59553篇
  1998年   15783篇
  1997年   14287篇
  1996年   14710篇
  1995年   13899篇
  1994年   13178篇
  1993年   12153篇
  1992年   46550篇
  1991年   45314篇
  1990年   43940篇
  1989年   41685篇
  1988年   38418篇
  1987年   37640篇
  1986年   34957篇
  1985年   33519篇
  1984年   25084篇
  1983年   21081篇
  1982年   12225篇
  1981年   11073篇
  1979年   22179篇
  1978年   15421篇
  1977年   13078篇
  1976年   12135篇
  1975年   13212篇
  1974年   15387篇
  1973年   14844篇
  1972年   13616篇
  1971年   12348篇
  1970年   11640篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
21.
22.
23.
24.
Introduction: The treatment of classical Hodgkin lymphoma (cHL) in children is a story of success. Nowadays, more than 90% of patients are cured and overall survival is nearly 100% at 5 years. Efforts have been made to avoid related effects of therapies; therefore, children are treated using different chemotherapy schemes in comparison with adults.

Areas covered: This review includes a view of the clinical classification and risk assessment in children suffering from HL. The chemotherapy more commonly employed is revisited. The use of PET/CT to evaluate the disease in order to guide therapy is analyzed. New options of chemotherapy and emerging immunotherapy are also included.

Expert opinion: In order to make the right treatment choice, a proper initial assessment of risk is mandatory. The choice of therapy in these kinds of patients must be done according to the experience of the team, and also, the cost and logistics related to the eligible scheme are very important. If possible, efforts must be made to include PET/CT in guiding therapy and avoiding overtreatment and long-term adverse effects in children. New options in immunotherapy are emerging and must be considered with caution in selected patients.  相似文献   

25.
Purpose: To use polymerase chain reaction (PCR) and Goldmann-Witmer coefficient (GWC) calculation to diagnose infectious uveitis.

Methods: Prospective cross-sectional study.

Results: Twenty-seven of 106 patients had positive PCR and/or GWC results on aqueous humor (AH) sampling and 15 of 27 (55.6%) were HIV-positive. Patients with non-anterior uveitis (NAU) were more likely to be HIV+ (p = 0.005). More than 1 possible pathogen was identified in 9 of 27 patients of whom 7 were HIV+. The final clinical diagnosis was discordant with AH findings in 9 of 27 cases. A positive EBV PCR result was associated with a discordant diagnosis (p = 0.001). All cases of herpetic anterior uveitis (42.9% HIV+) tested PCR-/GWC+ while all cases of herpetic NAU tested PCR+/GWC- (83.3% HIV+). All rubella virus cases were PCR+/GWC+.

Conclusion: PCR is useful to diagnose herpetic NAU in HIV+ patients while GWC is useful to diagnose herpetic anterior uveitis.  相似文献   

26.
27.
28.
29.

Background and objectives

A prompt and effective management of trauma patient is necessary. The aim of this case report is to highlight the importance of intraoperative echocardiography as a useful tool in patients suffering from refractory hemodynamic instability no otherwise explained.

Case report

A 41 year‐old woman suffered a car accident. At the emergency department, no abnormalities were found in ECG or chest X‐ray. Abdominal ultrasound revealed the presence of abdominal free liquid and the patient was submitted to urgent exploratory laparotomy. Nevertheless, she persisted suffering arterial hypotension and metabolic acidosis. Looking for the reason of her hemodynamic instability, intraoperative transthoracic echocardiography was performed, finding out the presence of pericardial effusion. Once the cardiac surgeon extracted pericardial clots, patient's situation improved clinically and analytically.

Conclusion

Every anesthesiologist should be able to use the intraoperative echocardiography as an effective tool in order to establish the appropriate measures to promote the survival of patients suffering severe trauma.  相似文献   
30.
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