首页 | 官方网站   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   623篇
  免费   35篇
  国内免费   21篇
医药卫生   679篇
  2021年   14篇
  2020年   3篇
  2018年   3篇
  2017年   7篇
  2016年   8篇
  2015年   12篇
  2014年   14篇
  2013年   20篇
  2012年   9篇
  2011年   13篇
  2010年   31篇
  2009年   36篇
  2008年   12篇
  2007年   26篇
  2006年   18篇
  2005年   14篇
  2004年   13篇
  2003年   3篇
  2002年   8篇
  2001年   13篇
  2000年   5篇
  1999年   8篇
  1998年   36篇
  1997年   37篇
  1996年   31篇
  1995年   31篇
  1994年   12篇
  1993年   19篇
  1992年   6篇
  1991年   8篇
  1990年   12篇
  1989年   14篇
  1988年   20篇
  1987年   17篇
  1986年   9篇
  1985年   16篇
  1984年   7篇
  1983年   7篇
  1982年   15篇
  1981年   7篇
  1980年   10篇
  1978年   7篇
  1977年   7篇
  1976年   14篇
  1975年   8篇
  1974年   13篇
  1972年   2篇
  1971年   3篇
  1933年   2篇
  1932年   4篇
排序方式: 共有679条查询结果,搜索用时 464 毫秒
101.
102.
Chronic pancreatitis: ultrasonic features   总被引:2,自引:0,他引:2  
Alpern  MB; Sandler  MA; Kellman  GM; Madrazo  BL 《Radiology》1985,155(1):215-219
A retrospective analysis of 84 ultrasound examinations (in 77 patients) was performed to assess the frequency of sonographic findings in chronic pancreatitis. The findings included: inhomogeneously increased echogenicity in 53% of these examinations, focal or diffuse enlargement in 41%, focal dense echoes in 40%, pseudocyst formation in 21%, and a hypoechoic head mass in 7%. Thirteen per cent of our patients had a normal sonogram. Several presentations of chronic pancreatitis not previously described in the sonographic literature included: pancreatic or common bile duct enlargement or pseudocyst formation with otherwise normal-appearing glands. There was no direct relationship between the presence of focal high-intensity echoes within the pancreatic parenchyma and the presence of radiographic calcification. There was no difference in the frequency of ultrasonic abnormalities between patients with and without clinical evidence of pancreatic insufficiency. These results indicate that the sonographic findings in chronic pancreatitis are significantly more varied than previous reports would indicate.  相似文献   
103.
104.

Objective

To identify the unusual breeding sites of two dengue vectors, i.e. Aedes albopictus (Ae. albopictus) and Aedes aegypti (Ae. aegypti).

Methods

During the second half of 2010, we performed an occasional survey in rural (Teluk Tempoyak) and urban (Gelugor) areas of Penang Island, Malaysia, to identify cryptic breeding sites.

Results

In the rural area, we found heterogeneous immature stages of Ae. albopictus in the water bowl of an encaged bird. We also observed Ae. aegypti eggs deposited in the flush tank of a toilet in the urban area.

Conclusions

It can be concluded that both breeding patterns can increase contact with hosts (humans and birds) and presumably population densities of Ae. albopictus and Ae. aegypti, thereby potentially boosting the risks for spread and transmission of arboviral diseases.  相似文献   
105.

INTRODUCTION

The management of Hirschsprung’s disease continues to evolve. This questionnaire survey aimed to determine current surgical management strategies for Hirschsprung’s disease in Britain.

SUBJECTS AND METHODS

The survey was sent electronically to all British paediatric surgeons. Initial questions explored individual experience and regional service provision. Additional questions, reserved for surgeons who perform definitive Hirschsprung’s disease surgery, addressed specific clinical scenarios.

RESULTS

Surveys were sent to 142 surgeons yielding 85 responses. After exclusions, 64 surveys from 21 centres were analysed. Forty-seven respondents worked in centres with designated ‘Hirschsprung’s disease surgeons’. Forty respondents perform definitive Hirschsprung’s disease surgery. In a well neonate with left-sided Hirschsprung’s disease, 34 of 40 surgeons favour primary pull-through following bowel decompression with rectal washouts; 35 of 40 surgeons aim to perform definitive surgery at less than 3 months of age, with 17 favouring laparoscopic-assisted Soave–Boley and 15 favouring an open Duhamel pull-through. Of the 40 surgeons, 36 use a staged approach to right-sided/total colonic Hirschsprung’s disease with 23 favouring a Duhamel or Long Duhamel pull-through.

CONCLUSIONS

The primary pull-through, using an open Duhamel or laparoscopic-assisted Soave–Boley technique, during the first 3 months of life, has become the operative strategy of choice in rectosigmoid Hirschsprung’s disease in Britain. Marked variation in practice remains for right-sided Hirschsprung’s disease.  相似文献   
106.
Aim: The aim of this study was to determine if asthmatic children have viruses more commonly detected in lower airways during asymptomatic periods than normal children. Methods: Fifty‐five asymptomatic children attending elective surgical procedures (14 with stable asthma, 41 normal controls) underwent non‐bronchoscopic bronchoalveolar lavage. Differential cell count and PCR for 13 common viruses were performed. Results: Nineteen (35%) children were positive for at least one virus, with adenovirus being most common. No differences in the proportion of viruses detected were seen between asthmatic and normal ‘control’ children. Viruses other than adenovirus were associated with higher neutrophil counts, suggesting that they caused an inflammatory response in both asthmatics and controls (median BAL neutrophil count, 6.9% for virus detected vs. 1.5% for virus not detected, p = 0.03). Conclusions: Over one‐third of asymptomatic children have a detectable virus (most commonly adenovirus) in the lower airway; however, this was not more common in asthmatics. Viruses other than adenovirus were associated with elevated neutrophils suggesting that viral infection can be present during relatively asymptomatic periods in asthmatic children.  相似文献   
107.
People with severe mental disorders are a neglected and vulnerable group in complex emergencies. Here, we describe field experiences in establishing mental health services in five humanitarian settings. We show data to quantify the issue, and suggest reasons for this neglect. We then outline the actions needed to establish services in these settings, including the provision of practical training, medication, psychosocial supports, and, when appropriate, work with traditional healers. We have identified some persisting problems locally, nationally, and internationally, and suggest some solutions. Protection and care of people with severe mental disorders in complex emergencies is a humanitarian responsibility.  相似文献   
108.

Background

A number of studies have examined the effects of home visits and showed inconsistent results on physical functioning, institutionalisation, and mortality. Despite continuing interest from professionals in home visits for older people, reports on older people’s needs and preferences for such visits are scarce.

Aim

This qualitative study aims to explore the views and needs of community-dwelling frail older people concerning home visits.

Design and setting

A qualitative study including interviews with frail older persons and their informal caregivers living in the area of Nijmegen, the Netherlands.

Method

Semi-structured interviews were conducted with frail older people and informal caregivers. A grounded theory approach was used for data-analysis.

Results

Eleven frail older people and 11 informal caregivers were included. Most participants emphasised the importance of home visits for frail older people. They felt that it would give older people the personal attention they used to receive from GPs but miss nowadays. Most stated that this would give them more trust in GPs. Participants stated that trust is one of the most important factors in a good patient–professional relationship. Further, participants preferred home visits to focus on the psychosocial context of the patient. They stated that more knowledge of the psychosocial context and a good patient–professional relationship would enable the professional to provide better and more patient-centred care.

Conclusion

Patients’ expectations of home visits are quite different from the actual purpose of home visiting programmes; that is, care and wellbeing versus cure and prevention. This difference may partly explain why the effectiveness of home visits remains controversial. Future studies on home visits should involve patients in the development of home visiting programmes.  相似文献   
109.
110.
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-23

京公网安备 11010802026262号