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   1079篇
  免费   87篇
  国内免费   5篇
耳鼻咽喉   16篇
儿科学   62篇
妇产科学   41篇
基础医学   122篇
口腔科学   32篇
临床医学   103篇
内科学   206篇
皮肤病学   20篇
神经病学   138篇
特种医学   88篇
外科学   82篇
综合类   17篇
预防医学   64篇
眼科学   58篇
药学   88篇
肿瘤学   34篇
  2024年   4篇
  2023年   6篇
  2022年   21篇
  2021年   12篇
  2020年   7篇
  2019年   21篇
  2018年   15篇
  2017年   9篇
  2016年   17篇
  2015年   24篇
  2014年   31篇
  2013年   40篇
  2012年   42篇
  2011年   43篇
  2010年   54篇
  2009年   39篇
  2008年   46篇
  2007年   37篇
  2006年   49篇
  2005年   47篇
  2004年   35篇
  2003年   37篇
  2002年   43篇
  2001年   26篇
  2000年   38篇
  1999年   29篇
  1998年   36篇
  1997年   38篇
  1996年   36篇
  1995年   31篇
  1994年   28篇
  1993年   23篇
  1992年   15篇
  1991年   17篇
  1990年   8篇
  1989年   19篇
  1988年   23篇
  1987年   18篇
  1986年   17篇
  1985年   12篇
  1984年   11篇
  1983年   6篇
  1982年   10篇
  1981年   12篇
  1980年   5篇
  1978年   3篇
  1977年   6篇
  1976年   5篇
  1974年   4篇
  1969年   3篇
排序方式: 共有1171条查询结果,搜索用时 15 毫秒
21.
22.
Visual prognosis after indirect traumatic optic neuropathy   总被引:5,自引:0,他引:5       下载免费PDF全文
OBJECTIVE: To investigate a possible correlation between final visual acuity and the presence at baseline of various systemic and local (orbital/ocular) signs in patients affected by indirect traumatic optic neuropathy. METHODS: 35 cases of traumatic optic neuropathy were examined retrospectively and 13 variables were tested. Univariate analysis with "no recovery of visual acuity" as the primary outcome was performed. Relative risk (RR) and 95% confidence intervals (CI) were calculated. Fisher's exact test was used for two variables to test differences between proportions. RESULTS: Four variables showed a significantly increased risk for no recovery of visual acuity: presence of blood within the posterior ethmoidal cells (RR = 2.25, 95% CI 1.25 to 4.04); age over 40 years (RR = 1.79, 1.07 to 2.99); loss of consciousness associated with traumatic optic neuropathy (RR = 2.21, 1.17 to 4.16); and absence of recovery after 48 hours of steroid treatment (p < 0.01, Fisher's exact test). Recovery documented at the first follow up visit after treatment was significantly associated with recovery at the last follow up visit (p < 0.01, Fisher's exact test). CONCLUSIONS: These four negative prognostic signs in patients affected by traumatic optic neuropathy may be useful in predicting the visual outcome in patients developing visual loss after head trauma and in deciding on the need for surgical treatment.  相似文献   
23.
24.
25.
Urinary incontinence is a frequent functional disease affecting 5% to 25% of women. It is commonly believed that urinary stress incontinence (USI) is caused by anatomical defects, thus it can be treated by restoring anatomy. More than 100 surgical techniques have been proposed for genuine stress incontinence treatment. The tension free vaginal tape procedure (TVT) for the treatment of genuine IUS in women was first reported in 1996 by Ulmsten et al. The purpose of this study was to evaluate objective and subjective efficacy of the TVT procedure in different types of female urinary incontinence. From February 2000 to December 2001, 52 patients with urinary incontinence underwent the TVT procedure in the Obstetric and Gynecology Department of Avezzano Hospital, Italy. No difference in the cure rates was found between patients undergoing the TVT alone or associated with anterior and/or posterior colporrhaphy. In accordance with many authors we can affirm that the TVT sling technique is easy to use, the time for surgery is relatively short, and the procedure is free of complications and provides a satisfactory outcome.  相似文献   
26.
Thirteen anaemic children on dialysis were assessed to determine the incidence of cardiac changes in end stage renal failure. Nine children had an increased cardiothoracic ratio on radiography. The electrocardiogram was abnormal in every case but no child had left ventricular hypertrophy as assessed by voltage criteria. However, left ventricular hypertrophy, often gross, was found on echocardiography in 12 children and affected the interventricular septum disproportionately. Cardiac index was increased in 10 patients as a result of an increased left ventricular stroke volume rather than heart rate. Left ventricular hypertrophy was significantly greater in those on treatment for hypertension and in those with the highest cardiac index. Abnormal diastolic ventricular function was found in 6/11 children. Children with end stage renal failure have significant cardiac abnormalities that are likely to contribute to the high cardiovascular mortality in this group. Anaemia and hypertension, or its treatment, probably contribute to these changes. Voltage criteria on electrocardiogram are of no value in detecting left ventricular hypertrophy. Echocardiography must be performed, with the results corrected for age and surface area, in order to detect and follow these abnormalities.  相似文献   
27.
28.
OBJECTIVE: To evaluate the association between celiac disease and specific anxiety and depressive disorders and to identify potential common pathogenetic links, with particular regard to thyroid function and autoimmunity. METHODS: Cases included 36 adult celiac patients, 25 females and 11 males, aged 18-64 years. Controls comprised 144 healthy subjects matched by sex and age with no clinical evidence or family history of celiac disease. Diagnosis of celiac disease was made on the basis of clinical history and serological criteria. Psychiatric diagnoses were formulated using the International Composite Diagnostic Interview, according to DSM-IV criteria. Thyroid was evaluated by palpation, echography and measurement of serum-free thyroid hormones (FT4, FT3), thyroid-stimulating hormone (TSH) and antithyroid autoantibodies (anti-TPO). RESULTS: Compared to controls, a significantly higher number of celiac patients met criteria for lifetime [15 (41.7%) versus 30 (29.8%), P < .01] and 6-month [7 (19.4%) versus 9 (6.2%), OR = 3.2, chi(2) = 5.2, P < .05] major depressive disorder (MDD) and lifetime [5 (13.9%) versus 3 (2.1%), P < .001] and 6-month [3 (8.1%) versus 2 (1.4%), P < .05] panic disorder (PD). Anti-TPO prevalence was significantly higher in celiac patients than in the control group (11/36 = 30.5% versus 14/144 = 9.7%, P < .001). A higher frequency of PD and MDD was found in celiac patients with positive anti-TPO when compared to negative anti-TPO patients (4/11 = 36.4% PD in TPO+ versus 1/25 = 4% PD in TPO-, P < .01; 9/11 = 81.8% MD in TPO+ versus 6/25 = 9.5% MD in TPO-, P < .01). CONCLUSION: Patients affected by celiac disease tend to show a high prevalence of PD and MDD and association with subclinical thyroid disease appears to represent a significant risk factor for these psychiatric disorders.  相似文献   
29.
Screening for complement deficiency in bacterial meningitis   总被引:1,自引:0,他引:1  
Seventy-seven children with bacterial meningitis were screened for complement deficiency. Both the classical and the alternate pathways were normal in 75 patients. Transiently reduced total haemolytic activity of the classical pathway was documented in a boy with meningococcal meningitis. Total haemolytic activity of both the classical and the alternate pathways were reduced in another patient with pneumococcal meningitis: individual complement components determination indicated predominant activation of the alternate pathway.  相似文献   
30.
We compared the efficacy of a single dose of an oral solution of levodopa methyl ester (ME) to that of standard levodopa, in the form of a single dose of Madopar, in reversing afternoon "off" periods in 12 patients with Parkinson's disease (PD). The highly soluble ME solution led to a significantly more rapid reversal of "off" periods. This preparation may therefore convey a clinical advantage in patients experiencing motor fluctuations whilst taking multiple daily dosages of levodopa, particularly in those with long or highly variable latency to the next "on" period.  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