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   1004篇
  免费   41篇
  国内免费   22篇
耳鼻咽喉   11篇
儿科学   41篇
妇产科学   16篇
基础医学   68篇
口腔科学   46篇
临床医学   78篇
内科学   272篇
皮肤病学   6篇
神经病学   59篇
特种医学   19篇
外科学   93篇
综合类   98篇
一般理论   6篇
预防医学   87篇
眼科学   54篇
药学   76篇
中国医学   2篇
肿瘤学   35篇
  2024年   1篇
  2023年   19篇
  2022年   104篇
  2021年   103篇
  2020年   48篇
  2019年   56篇
  2018年   53篇
  2017年   33篇
  2016年   30篇
  2015年   36篇
  2014年   61篇
  2013年   59篇
  2012年   80篇
  2011年   60篇
  2010年   27篇
  2009年   28篇
  2008年   42篇
  2007年   33篇
  2006年   27篇
  2005年   29篇
  2004年   38篇
  2003年   27篇
  2002年   27篇
  2001年   5篇
  2000年   3篇
  1999年   3篇
  1998年   4篇
  1997年   3篇
  1996年   4篇
  1995年   6篇
  1994年   2篇
  1993年   2篇
  1991年   1篇
  1990年   2篇
  1989年   2篇
  1988年   5篇
  1987年   1篇
  1986年   1篇
  1976年   1篇
  1972年   1篇
排序方式: 共有1067条查询结果,搜索用时 15 毫秒
101.
102.
Retinopathy of Prematurity (ROP) is one of the leading causes of bilateral blindness in childhood. Early detection and effective treatment can prevent blindness. Efficient and timely screening examination of the retina by an experienced ophthalmologist who deals with preterm neonates with ROP is the mainstay in the management of this disease. All neonatologists and pediatricians who care for these at-risk preterm neonates should also be aware of this timing. This practical guideline intends to provide guidance to ophthalmologists, neonatologists and allied health care professionals in Saudi Arabia on current indications for screening and management of retinopathy of prematurity to prevent or minimize subsequent complications. This practical guideline was led by the National Eye Health Program (NEHP) and Neonatology Services Improvement Program at Ministry of Health (MOH), furthermore it has been solicited and endorsed from both Saudi Ophthalmological Society (SOS) and Saudi Neonatology Society (SNS).  相似文献   
103.
104.
A 28‐year‐old man was admitted to our emergency service with a shortness of breath and palpitation. On admission, his blood pressure was high and he was in hypertensive pulmonary edema. His physical examination showed rales in both lungs and pansystolic murmur at mitral focus. His medical history included aortic valve replacement (AVR) because of native aortic valve infective endocarditis. Transthoracic echocardiography (TTE) showed normal functional aortic valve. Color flow imaging demonstrated severe mitral regurgitation with posterior eccentric jet. To examine in detail, transesophageal echocardiography (TEE) and three‐dimensional (3D) echocardiography were performed. TEE disclosed a separation in the subaortic curtain leading to severe mitral regurgitation from the left ventricle to the left atrium. In addition to severe mitral regurgitation with posterior eccentric jet, 26‐mm‐long pouch was seen in mitral‐aortic intervalvular fibrosa (MAIVF) at 120° TEE view. This pouch was separated from the mitral anterior leaflet junction releasing the mitral anterior leaflet and causing prolapse and chorda rupture in the A2 scallop of the mitral anterior leaflet. The MAIVF connects the anterior mitral leaflet to the posterior portion of the aortic annulus. The separation of the MAIVF represents a complication of the aortic valve replacement.  相似文献   
105.
The objectives of this Community-based National Epidemiological Household Survey, conducted between 1990–1993, were to estimate the prevalence of overweight and obesity in Saudi Arabia and to examine its association with the socio-demographic characteristics of the adult population. A sample of Saudis 20 years and over was selected using a multistage stratified cluster sampling technique with probability proportionate to size. The selected subjects were requested to visit primary health care centers in their localities. Physicians in these clinics took measurements of heights and weights and collected other relevant data. Obesity was measured by the Body Mass Index, using the Quetelet Index. The results showed the sample of 10,651 subjects of which 50.8% were males, had a mean age of 35.8 years (SD = 14.27 years). The prevalence of overweight was 31.2% (95% confidence interval: 30.3%, 32.1%); 33.1% for males and 29.4% for females. For obesity, the overall prevalence was 22.1%; males 17.8% and females 26.6%. The study design suggested that these estimates could be closer to the true values. The multiple logistic regression analysis showed that age, residential area, region, income, gender, and education are statistically significant predictors of obesity. The prevalence of obesity was higher in females than males, lower in subjects living in rural areas with traditional lifestyles than those in more urbanized environments, and increased with increasing age. The observed prevalence and pattern of overweight and obesity with age and gender is similar to those observed in the Arab community and some Western nations. There is a need for increased physical activity and better nutrition education programs to reduce the extent of obesity and to pre-vent the serious health consequences, especially, in the middle age group.  相似文献   
106.
During a baseline survey of TST, 236 nurses underwent a two-step TST. Overall, 29 (12%) showed boosting. All age groups showed boosting; the rate was 9.7% in those younger than 35 years. Subjects older than 45 years were more likely to have a booster effect than younger individuals (29% vs 10.1%).  相似文献   
107.
In the era of antibiotics, Pott-Puffy Tumor PPT is a rarely recognized entity. An 11-year-old girl presented with headache, fever for one week, and frontal swelling for 3 days. On examination, she was febrile, congested nasal mucosa with yellowish nasal discharge and frontal swelling; tender not fluctuating with normal eye mobility. Computed tomography CT scan of brain and paranasal sinus revealed opacity of maxillary, left ethmoid, frontal sinus opacity and epidural collection in the right frontal region with post contrast enhancement. An extracranial superficial swelling with fluid collection at the same level of epidural collection. The patient underwent bilateral antral washout and left frontal sinus trephination, which had resulted into a complete resolving of symptoms and an avoidance of further invasive surgical intervention.  相似文献   
108.
109.
110.

Purpose

The clinical, endoscopic, and histologic findings of eosinophilic esophagitis (EoE) are well characterized; however, there have been very limited data regarding the radiologic findings of pediatric EoE. We report on the radiologic findings of pediatric EoE observed on barium esophagram and correlate them with the endoscopic findings.

Methods and materials

We identified children diagnosed with EoE in our center from 2004 to 2015. Two pediatric radiologists met after their independent evaluations of each fluoroscopic study to reach a consensus on each case. Clinical and endoscopic data were collected by retrospective chart review.

Results

Twenty-six pediatric EoE cases (age range 2–13 years; median 7.5 years) had barium esophagram done as part of the diagnostic approach for dysphagia. Thirteen children had abnormal radiologic findings of esophagus (50%): rings formation (n = 4), diffuse irregularity of mucosa (n = 8), fixed stricture formation (n = 3), and narrow-caliber esophagus (n = 10). Barium esophagram failed to show one of 10 cases of narrow-caliber esophagus and 10 of 14 cases of rings formation visualized endoscopically. The mean duration of symptoms prior to diagnosis of EoE was longer (3.7 vs. 1.7 year; p value 0.019), and the presentation with intermittent food impaction was commoner in the group with abnormal barium esophagram as compared to the group with normal barium esophagram (69% vs. 8%; p value 0.04).

Conclusion

Barium swallow study is frequently normal in pediatric EoE. With the exception of narrow-caliber esophagus, our data show poor correlation between radiologic and endoscopic findings.
  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