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   781篇
  免费   107篇
  国内免费   1篇
耳鼻咽喉   6篇
儿科学   20篇
妇产科学   29篇
基础医学   70篇
口腔科学   14篇
临床医学   382篇
内科学   95篇
皮肤病学   5篇
神经病学   70篇
特种医学   16篇
外科学   51篇
综合类   2篇
一般理论   2篇
预防医学   39篇
眼科学   14篇
药学   31篇
中国医学   3篇
肿瘤学   40篇
  2023年   4篇
  2022年   9篇
  2021年   22篇
  2020年   26篇
  2019年   16篇
  2018年   26篇
  2017年   28篇
  2016年   35篇
  2015年   27篇
  2014年   55篇
  2013年   52篇
  2012年   56篇
  2011年   71篇
  2010年   81篇
  2009年   57篇
  2008年   36篇
  2007年   34篇
  2006年   45篇
  2005年   31篇
  2004年   34篇
  2003年   28篇
  2002年   24篇
  2001年   13篇
  2000年   4篇
  1999年   4篇
  1998年   6篇
  1997年   10篇
  1996年   3篇
  1995年   12篇
  1994年   6篇
  1993年   5篇
  1992年   3篇
  1991年   1篇
  1990年   2篇
  1988年   1篇
  1987年   2篇
  1986年   2篇
  1985年   2篇
  1984年   3篇
  1983年   2篇
  1982年   2篇
  1979年   1篇
  1977年   1篇
  1976年   1篇
  1973年   1篇
  1972年   1篇
  1947年   1篇
  1944年   1篇
  1942年   1篇
  1936年   1篇
排序方式: 共有889条查询结果,搜索用时 31 毫秒
21.
A situs inversus with dextrocardia (DC) is a rare condition in adults. Usually, patients have structurally normal hearts and normal life expectancy. The incidence of coronary artery disease in this setting is similar to that in the general population.Coronary revascularization may present potential difficulties related to the unusual anatomy. Although the radial artery is a safe and effective site of access for coronary interventions, some anatomical variations may make this procedure more complicated. We describe two cases of patients with situs viscerum inversus and acute myocardial infarction who underwent successful transradial percutaneous coronary intervention (PCI). We will show that coronary angioplasty with stent application via the radial approach in patients with DC is feasible and effective also in emergency and urgent care.  相似文献   
22.

Background

Radioguided occult lesion localization (ROLL) with technetium-99 m colloid (ROLL-99mTc) is commonly used to perform breast-conserving surgery in patients with nonpalpable breast tumors. Radioactive seed localization is a relatively new technique that localizes the tumor with a radioactive iodine-125 (125I) seed. The feasibility and outcome of these techniques after neoadjuvant systemic treatment has not been widely investigated.

Methods

All patients treated with neoadjuvant systemic treatment between 2007 and 2010 in the Netherlands Cancer Institute who underwent breast-conserving surgery with the ROLL-99mTc technique (n = 83) or with 125I seed localization (n = 71) were analyzed. The weight of the resected specimen, the margins, and the percentage of patients requiring a second surgical intervention as a result of positive margins were assessed.

Results

Patient and tumor characteristics and systemic treatment regimens were comparable between both groups. The median weight of the resected specimen (53 vs. 48 g), the median smallest margin (3.5 vs. 3.0 mm), and the risk for additional surgery for incomplete resections (7 vs. 8 %) did not differ significantly between patients treated with the ROLL-99mTc technique and 125I seed localization.

Conclusions

The ROLL-99mTc technique and 125I seed localization demonstrate comparable results when used to perform breast-conserving surgery after neoadjuvant systemic treatment. Because 125I seed localization does not require additional radiological localization shortly before surgery, it simplifies surgery scheduling. Therefore, we prefer 125I seed localization to perform breast-conserving surgery after neoadjuvant systemic treatment.  相似文献   
23.
24.
Pratt HD  Pratt BM  Sackett M 《Primary care》2007,34(2):219-25; abstract vi
This article addresses the issue of teaching youth skills that will help them to maximize opportunities and positive consequences and minimize exposure to negative consequences in their lives. These skills will allow them to mature into mentally healthy, productive members of society. Essential skills that are critical to allow this maturational process include developing prosocial skills; the ability to recognize, discriminate the level of threat, and use strategies to avoid danger; and the ability to adapt to the changing demands of his or her environment.  相似文献   
25.
Abdominal pregnancy is a rare condition in which the fetus and placenta are located within the peritoneal cavity. Sonographic findings include visualization of the fetus separate from the uterus, failure to visualize the uterine wall between the fetus and urinary bladder, close approximation of fetal parts to the maternal abdominal wall, eccentric position or abnormal fetal attitude, and visualization of extrauterine placental tissue. We present an unusual case in which mid-trimester transabdominal color Doppler sonographic findings depicted unusual maternal vasculature in the placental periphery leading to the diagnosis of abdominal pregnancy. Postpartum maternal angiography confirmed these vessels as abnormal maternal arterial perfusion of the extrauterine placenta emanating from the uterine arteries and inferior epigastric arteries. Systematic review of the literature confirms that this is the first report of such sonographic manifestations of an abdominal pregnancy.  相似文献   
26.
金泽高  程杰  李艳芳  王密腊 《新中医》2021,53(2):115-117
目的:探讨针灸镇痛应用于急性牙髓炎一次性根管术镇痛中的临床疗效。方法:将120例急性牙髓炎患者按随机数字表法分为对照组和研究组各60例。对照组给予常规阿替卡因和利多卡因局部阻滞麻醉治疗,研究组在对照组基础上给予针灸镇痛治疗。比较2组临床疗效及不良反应发生情况。结果:研究组总有效率为98.33%,高于对照组85.00%,差异有统计学意义(P<0.05)。研究组不良反应发生率为1.67%,低于对照组11.67%,差异有统计学意义(P<0.05)。结论:针灸镇痛应用于急性牙髓炎一次性根管术镇痛中,临床疗效确切,不良反应小,安全性高。  相似文献   
27.
28.
29.
30.
A previously healthy 49-year-old male patient presented with COVID-19 infection and required mechanical ventilation and extracorporeal membrane oxygenation due to severe hypoxemia. Echocardiography showed cardiac dysfunction with an apical sparing strain pattern, which rapidly normalized within a week. Apical sparing myocardial strain in patients with COVID-19 infection may suggest reverse-type stress cardiomyopathy.  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