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   29471篇
  免费   2442篇
  国内免费   623篇
耳鼻咽喉   250篇
儿科学   492篇
妇产科学   921篇
基础医学   3708篇
口腔科学   600篇
临床医学   3206篇
内科学   6147篇
皮肤病学   346篇
神经病学   2006篇
特种医学   886篇
外国民族医学   3篇
外科学   3943篇
综合类   1732篇
现状与发展   3篇
一般理论   7篇
预防医学   1862篇
眼科学   1088篇
药学   2227篇
  6篇
中国医学   724篇
肿瘤学   2379篇
  2023年   300篇
  2022年   578篇
  2021年   901篇
  2020年   593篇
  2019年   762篇
  2018年   843篇
  2017年   740篇
  2016年   738篇
  2015年   998篇
  2014年   1193篇
  2013年   1413篇
  2012年   2059篇
  2011年   2198篇
  2010年   1326篇
  2009年   1128篇
  2008年   1653篇
  2007年   1622篇
  2006年   1688篇
  2005年   1608篇
  2004年   1359篇
  2003年   1213篇
  2002年   1124篇
  2001年   796篇
  2000年   784篇
  1999年   707篇
  1998年   282篇
  1997年   273篇
  1996年   223篇
  1995年   156篇
  1994年   166篇
  1993年   124篇
  1992年   364篇
  1991年   331篇
  1990年   286篇
  1989年   259篇
  1988年   217篇
  1987年   210篇
  1986年   183篇
  1985年   137篇
  1984年   98篇
  1983年   90篇
  1982年   95篇
  1981年   78篇
  1980年   54篇
  1979年   73篇
  1978年   66篇
  1977年   44篇
  1975年   42篇
  1974年   55篇
  1973年   41篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
1.
2.
3.

Background

Persistent iatrogenic atrial septal defect (iASD) is a common but poorly characterized complication after cryoballoon (CB) pulmonary vein isolation (PVI) procedures. We therefore investigate its prevalence, evolution, risk factors, and clinical outcomes in a prospective longitudinal study.

Methods

A total of 108 patients (41 women, mean age 57 ± 11.3) underwent CB PVI for AF. Serial transesophageal echocardiography (TEE) was performed 9 months and then annually until 6 years after the procedure to study the characteristics of persistent iASD.

Results

Persistent iASD occurred in 33 (30.6%) patients 9 months after CB PVI. Spontaneous closure of iASD was found in 6 (22.2%) and 3 (15.8%) patients 2 and 3 years after the procedures, respectively. No spontaneous closure was observed on 4, 5, and 6-year TEE follow-up. The projected long-term persistence rate of iASD after CB PVI was therefore 20% (30.6% × 0.778 × 0.842). Using multivariate logistic regression, a higher number of cryoapplications (≥ 2 minutes) was the only independent predictor of persistent iASD 9 months after CB PVI (odds ratio [OR] 1.207; 95% confidence interval [CI], 1.033-1.411, P = 0.018). Two (1.9%) patients with significantly larger iASD size than the others (long diameter 12.6 ± 0.8 vs 3.7 ± 1.5 mm, P < 0.001; short diameter 10.9 ± 0.2 vs 3 ± 1.1 mm, P < 0.001) required percutaneous closure because of exertional dyspnea and right ventricular enlargement. Over 129.7 patient-years follow-up, during which iASD persisted, there was no occurrence of neurologic events.

Conclusions

Approximately one fifth of patients undergoing CB PVI will have permanently persistent iASD. Patients with defect sizes of greater than 10 mm may need percutaneous closure due to significant left-to-right shunting.  相似文献   
4.
5.
6.
The objective of this study is to assess the efficacy and safety of herbal medicines (HMs), as a monotherapy or adjunct therapy, compared to placebo or conventional approaches in the treatment of idiopathic Parkinson's disease (PD). We conducted a systematic review of randomized controlled trials from both conventional and alternative medicine sources. Outcome measures were overall improvement, quality of life, reduction of levodopa dose, and adverse events. Nine studies were included, each testing a different HM. Six of the trials had limited internal validity due to major flaws in design, including the lack of proper randomization; insufficient blinding; unclear inclusive criteria in terms of diagnostic criteria, baseline staging, and duration of disease; lack of proper sample size calculation; and insufficient data analysis. Imbalances in gender and ethnicity among the patients in the included trials were observed. No major adverse events emerged, and no specific pattern was detected from the trials describing such data. In addition to major methodological defects, heterogeneity in (1) HM tested, (2) control treatment, and (3) outcome measure hindered in-depth data analysis and synthesis. Current evidence is insufficient to evaluate the efficacy and safety of various HMs. Further studies with improved trial design and reporting, with assessment on cost-effectiveness, quality of life, and qualitative data are warranted.  相似文献   
7.
“搓滚舒筋”练功疗法,是一种以竹筒为简易器械的脚底搓滚练功治疗“筋挛缩”症的方法。最早文献见于马王堆汉墓出土的帛书《五十二病方》,起码有两干多年的渊源。骨伤科常用之,内、外诸科亦有用之。这一传统疗法,筒、便、廉、验,值得弘扬。  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