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   2583篇
  免费   167篇
  国内免费   19篇
耳鼻咽喉   32篇
儿科学   108篇
妇产科学   142篇
基础医学   263篇
口腔科学   52篇
临床医学   195篇
内科学   573篇
皮肤病学   13篇
神经病学   147篇
特种医学   135篇
外科学   463篇
综合类   106篇
一般理论   2篇
预防医学   192篇
眼科学   77篇
药学   106篇
中国医学   10篇
肿瘤学   153篇
  2024年   3篇
  2023年   23篇
  2022年   80篇
  2021年   95篇
  2020年   66篇
  2019年   75篇
  2018年   102篇
  2017年   72篇
  2016年   97篇
  2015年   118篇
  2014年   130篇
  2013年   183篇
  2012年   202篇
  2011年   213篇
  2010年   134篇
  2009年   104篇
  2008年   171篇
  2007年   181篇
  2006年   152篇
  2005年   103篇
  2004年   92篇
  2003年   75篇
  2002年   64篇
  2001年   25篇
  2000年   41篇
  1999年   15篇
  1998年   11篇
  1997年   5篇
  1996年   6篇
  1995年   4篇
  1994年   5篇
  1993年   6篇
  1992年   5篇
  1991年   7篇
  1990年   16篇
  1989年   7篇
  1988年   8篇
  1987年   9篇
  1986年   5篇
  1985年   5篇
  1983年   7篇
  1982年   3篇
  1976年   2篇
  1975年   2篇
  1973年   3篇
  1972年   3篇
  1968年   6篇
  1967年   3篇
  1966年   3篇
  1965年   5篇
排序方式: 共有2769条查询结果,搜索用时 0 毫秒
101.
102.
Saoud  Marwan  Saeed  Musa  Patel  Sumit  Mador  M. Jeffery 《Lung》2020,198(1):181-185
Introduction

To determine the 1-year and 3-year adherence rates with Positive Airway Pressure (PAP) therapy in patients with schizophrenia compared to matched controls.

Methods

A case–control retrospective analysis was performed in a Veterans Affairs hospital. All symptomatic patients with schizophrenia ever started on PAP therapy between 2007 and 2015 were compared with controls matched for severity of sleep apnea based on AHI, BMI, and age at the time of diagnosis.

Results

Total number of subjects in both groups was 39. Mean AHI among cases and controls was 27.63 ± 22.16 and 33.59 ± 44.04 (p = 0.32), mean BMI was 34.91 ± 5.87 and 33.92 ± 5.21 (p = 0.43), and mean age at diagnosis was 53.6 ± 11.75 and 55.97 ± 11.92 (p = 0.36), respectively. There was no statistically significant difference in PAP use between patients with schizophrenia and controls at 1-year (percent days device use > 4 h—36.43% ± 31.41 vs. 49.09% ± 38.76; p = 0.17) and 3-year (percent days device use > 4 h—42.43 ± 35.50 vs. 60.53 ± 38.56; p = 0.089) visits

Conclusions

PAP adherence and usage is not significantly different among patients with schizophrenia compared to matched controls. Therefore, schizophrenia does not appear to influence CPAP compliance.

  相似文献   
103.
Metabolic Brain Disease - As feared and deadly human diseases globally, Rabies virus contrived mechanisms to escape early immune recognition via suppression of the interferon response. This study,...  相似文献   
104.

INTRODUCTION

Amyloid goiter (AG) is characterized by enlargement of the thyroid gland as a result of extensive amyloid deposition in a bilateral and diffuse manner.

PRESENTATION OF CASE

A 58-year-old male patient was diagnosed of Crohn''s Disease (CD). He was admitted to our clinic with complaint of respiratory distress and rapid growth swelling in the neck. Ultrasound examination revealed huge multinodular goiter on both sides of thyroid gland. We performed bilateral total thyroidectomy. Pathological evaluation revealed AG.

DISCUSSION

Amyloid leads to degeneration in tissues, thereby disrupts the function of the relevant organs. It is important to distinguish AG from other reasons of goiter, particularly thyroid medullary cancer that can cause amyloid deposition in thyroid gland. Secondary amyloidosis frequently involves thyroid gland at microscopic level, but rarely causes goiter. An analysis of current literature revealed that only few cases of AG occurred secondary to CD. Herein we presented a case of AG who has rapidly growing goiter that associated with CD.

CONCLUSION

AG must be kept in mind in case of rapidly growing goiter, especially in patients with chronic inflammatory bowel diseases.  相似文献   
105.
106.

Background

The aim of this study was to present our experience with six cases of fetal intracranial hemorrhage (ICH) in terms of prenatal diagnostic features, and postnatal outcome.

Methods

The database of prenatal diagnosis unit was searched for antenatally diagnosed ICH cases. Maternal characteristics, ultrasound (US), and magnetic resonance imaging (MRI) findings, clinical course, and postnatal outcome were noted.

Results

We evaluated six consecutive cases of fetal ICH. One case was terminated at 24 weeks, and remaining five cases were delivered between 34 and 38 weeks. Five cases (5/6) had intraventricular, and one (1/6) had intraparenchymal hemorrhage. Hemorrhages were right sided in five cases (5/6), left sided in one case (1/6). Dilated and echogenic ventricular wall were the common US findings. No predisposing factor was detected in four of the cases, and intrauterine growth restriction was an underlying factor in two fetuses. Intrauterine progression of the hydrocephaly, and parenchymal thinning was seen in four cases (4/6). In three of four cases (3/4) with progressive grade 3–4 hemorrhage and hydrocephaly, postnatal outcome were dismal, and one case had mild neurological impairment at three months. In one case which had non-progressive mild ventriculomegaly, the lesion regressed after 4 weeks, and had normal short-term outcome

Conclusion

Fetal ICH can be accurately identified and categorized by antenatal sonography, and fetal MRI. Although intrauterine regression or normal short-term postnatal outcome is possible, the outcome is usually poor for fetuses with high grade and/or progressive lesions. Therefore, further studies assessing long-term postnatal outcome are needed  相似文献   
107.

Introduction

The present study was designed to demonstrate the efficacy of standard 4.0 mm cannulated screw fixation by comparing it with palmar locking plate fixation in the treatment of acute, unstable, simple extra-articular distal radius fractures.

Materials and methods

We prospectively collected and retrospectively analyzed outcomes data for 65 patients aged between 18 and 60 with AO type A2 fractures treated with closed reduction, percutaneous cannulated screw fixation (CRPCS n = 34) or open reduction palmar locking plate fixation (ORPLP n = 31). Range of motion, grip strength, Gartland–Werley and QuickDASH scores were compared at 2 months after surgery, and final follow-up (mean 32 months, range 12–90). Deterioration in radiographic parameters were measured and compared. Operative time and return to preinjury activity were evaluated.

Results

Parameters did not differ significantly between the groups at either time point with respect to grip strength or range of motion, except pronation and supination; they were better in the CRPCS group (p = 0.005 and 0.025, respectively) at 2 month follow-up. The Gartland–Werley and QuickDASH scores obtained at final follow-up were similar for each group and lacked statistical significance. Group comparison for the deterioration of radiologic parameters showed no significant difference. CRPCS group had significantly shorter operative time (p = 0.001) and there was no significant differences between the groups regarding the return to preinjury activity (p = 0.129).

Conclusions

CRPCS group was found to be as successful as ORPLP group and it may be suitable in the case of young, active individuals with AO type A2 distal radius fractures.  相似文献   
108.
109.
To recognize the period of exaggerated cytokine response in patients with coronavirus disease 2019 (COVID-19) pneumonia, and to describe the clinical outcomes of using tocilizumab as a treatment option. The data of 12 adult COVID-19 pneumonia patients who were followed in the inpatient clinics of Biruni University Medical Faculty Hospital (Istanbul, Turkey) were retrospectively analyzed. Diagnostic tests, laboratory examinations, clinical findings, and computed tomography of the thorax imaging results were evaluated. A dramatic laboratory and clinical improvement was observed in 83% (10 out of 12) of patients after tocilizumab. In 17% (2 out of 12) of our patients, short-term ventilator support was required in the intensive care unit. The longest hospital stay was 18 days. However, in the end, all of our patients were discharged home with good health. Although arterial oxygen saturations (87.58 ± 3.12%) dropped in room air in the pre-tocilizumab period, post-tocilizumab they normalized in all patients (94.42 ± 1%). None of them had fever after tocilizumab treatment and the levels of C-reactive protein (13.08 ± 12.89) were almost within normal limits. Eosinophil values were quite low at the time of diagnosis (10 ± 17.06), but increased significantly post-tocilizumab (155.33 ± 192.69). There is currently no proven treatment for COVID-19 induced by novel coronavirus SARS-CoV-2. Based on our experience with twelve adult COVID-19 pneumonia patients, we can say that tocilizumab, an IL-6 inhibitor, is more beneficial in preventing the damage caused by excessive cytokine response in the body if administered at the right time and provides clinical and radiological recovery.  相似文献   
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