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   65891篇
  免费   3549篇
  国内免费   266篇
耳鼻咽喉   904篇
儿科学   1635篇
妇产科学   1444篇
基础医学   9111篇
口腔科学   4262篇
临床医学   5314篇
内科学   14378篇
皮肤病学   1703篇
神经病学   5643篇
特种医学   1607篇
外国民族医学   1篇
外科学   7402篇
综合类   362篇
一般理论   16篇
预防医学   6668篇
眼科学   1213篇
药学   4740篇
中国医学   479篇
肿瘤学   2824篇
  2023年   580篇
  2022年   1237篇
  2021年   2307篇
  2020年   1368篇
  2019年   1996篇
  2018年   2434篇
  2017年   1649篇
  2016年   1779篇
  2015年   2068篇
  2014年   2721篇
  2013年   3479篇
  2012年   5087篇
  2011年   5522篇
  2010年   2885篇
  2009年   2318篇
  2008年   3970篇
  2007年   3949篇
  2006年   3517篇
  2005年   3235篇
  2004年   3019篇
  2003年   2573篇
  2002年   2355篇
  2001年   1302篇
  2000年   1263篇
  1999年   1054篇
  1998年   408篇
  1997年   290篇
  1996年   292篇
  1995年   203篇
  1994年   207篇
  1993年   160篇
  1992年   432篇
  1991年   406篇
  1990年   351篇
  1989年   311篇
  1988年   294篇
  1987年   262篇
  1986年   249篇
  1985年   214篇
  1984年   199篇
  1983年   164篇
  1982年   98篇
  1981年   111篇
  1980年   101篇
  1979年   137篇
  1978年   97篇
  1975年   80篇
  1971年   90篇
  1969年   77篇
  1967年   87篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.
Anomalous origin of the left coronary artery from the pulmonary artery (ALCAPA) is a rare congenital condition. It responds well to early diagnosis and treatment, but otherwise the prognosis is poor. We present our case series of 12 patients (mean age, 2 ± 2.58 yr; age range, 2 mo–8 yr), emphasizing the diagnostic process and discussing our surgical results. The diagnosis of ALCAPA should be suspected in infants who have dilated cardiomyopathy with electrocardiographic changes that suggest ischemia, and in older children who have isolated mitral regurgitation. When clinical suspicion is high, the results of 2-dimensional echocardiography combined with color-flow Doppler studies in expert hands can establish the diagnosis, thus avoiding angiography in critically ill infants. The treatment of choice in our patients was transfer and reimplantation of the left coronary artery onto the ascending aorta. There were 2 deaths: both were infants in extremis who underwent emergency surgery. An older child with severe ventricular dysfunction was given mechanical ventricular assistance and then heart transplantation. As of this report, all 10 survivors remained well and asymptomatic.  相似文献   
4.
Objective: To assess the quality of images and video clips of fetal central nervous (CNS) structures obtained by ultrasound and transmitted via tele-ultrasound from Brazil to Australia.

Methods: In this cross-sectional study, 15 normal singleton pregnant women between 20 and 26 weeks were selected. Fetal CNS structures were obtained by images and video clips. The exams were transmitted in real-time using a broadband internet and an inexpensive video streaming device. Four blinded examiners evaluated the quality of the exams using the Likert scale. We calculated the mean, standard deviation, mean difference, and p values were obtained from paired t tests.

Results: The quality of the original video clips was slightly better than that observed by the transmitted video clips; mean difference considering all observers = 0.23 points. In 47/60 comparisons (78.3%; 95% CI?=?66.4–86.9%) the quality of the video clips were judged to be the same. In 182/240 still images (75.8%; 95% CI?=?70.0–80.8%) the scores of transmitted image were considered the same as the original.

Conclusion: We demonstrated that long distance tele-ultrasound transmission of fetal CNS structures using an inexpensive video streaming device provided images of subjective good quality.  相似文献   
5.
6.
7.

Objective

To discover the experiences of end-of-life patients attended by the emergency services, through the discourse of the family caregivers who accompanied the family member in this care transit.

Method

A qualitative approach study, based on the paradigm of hermeneutical phenomenology. In total, 81 family caregivers participated. The techniques used were the in-depth interview and the discussion group, with a total of 5 discussion groups and 41 interviews. The period of data collection was carried out between January 2013 and June 2014.

Results

In the network of discourses obtained with respect to “Urgent Care”, all the codes were grouped in relation to a single argumentative line: deficiencies in urgent care. Among them, we found different dimensions that are established depending on the different times of care, or the different determinant aspects of these deficiencies: disorganization of the care received, lack of experience of the professionals in emergencies, application of general protocols in the emergency services, inadequate care in the treatment received, delays in emergency care.

Conclusions

In general, we highlight the dissatisfaction of the family members with respect to the care received from the emergency services. The needs of these types of situation are not covered from these services and are of low quality. Therefore, it is necessary to reorient the care protocols for these patients.  相似文献   
8.
9.
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