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   10129018篇
  免费   631331篇
  国内免费   162210篇
耳鼻咽喉   130916篇
儿科学   282692篇
妇产科学   231832篇
基础医学   1255073篇
口腔科学   264644篇
临床医学   1023861篇
内科学   1698097篇
皮肤病学   203762篇
神经病学   730647篇
特种医学   377731篇
外国民族医学   1661篇
外科学   1331396篇
综合类   715016篇
现状与发展   513篇
一般理论   3728篇
预防医学   814394篇
眼科学   230517篇
药学   866790篇
  2871篇
中国医学   211455篇
肿瘤学   544963篇
  2023年   53729篇
  2022年   131496篇
  2021年   200775篇
  2020年   143393篇
  2019年   146344篇
  2018年   178322篇
  2017年   158713篇
  2016年   153056篇
  2015年   191089篇
  2014年   278222篇
  2013年   369713篇
  2012年   522481篇
  2011年   566786篇
  2010年   384138篇
  2009年   345565篇
  2008年   482796篇
  2007年   503265篇
  2006年   480317篇
  2005年   442204篇
  2004年   389171篇
  2003年   360622篇
  2002年   332577篇
  2001年   312716篇
  2000年   311332篇
  1999年   267225篇
  1998年   111703篇
  1997年   98509篇
  1996年   92560篇
  1995年   84655篇
  1994年   76875篇
  1993年   65564篇
  1992年   183450篇
  1991年   177442篇
  1990年   172210篇
  1989年   166948篇
  1988年   154510篇
  1987年   150251篇
  1986年   143019篇
  1985年   136276篇
  1984年   103688篇
  1983年   89013篇
  1982年   56701篇
  1979年   93077篇
  1978年   66794篇
  1977年   57603篇
  1975年   58441篇
  1974年   67409篇
  1973年   64326篇
  1972年   59450篇
  1971年   55070篇
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
151.
152.
153.
154.
155.
156.
157.
158.
159.

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   
160.
Objectives: The steeling effect suggests that early-life adversity can have a beneficial impact later in life. However, little is known about its underlying mechanisms and long-term outcomes . The study aimed to examine the role of early-life adversity (ELA) on successful aging, and whether this relationship can be explained by mental and physical health.

Method: Socio-demographics, early-life adversity (ELA), individual quality of life (iQoL), and mental and physical health of 270 individuals (Mage = 66.82 years, 71.5% female) were assessed. Polynomial regressions and mediation analyses were conducted.

Results: Significant inverse U-shaped associations were found between ELA and iQoL (β = ?.59, p = .005) and between ELA and mental health (β = ?.64, p = .002), but not between ELA and physical health. Furthermore, mental health significantly mediated the relationship between ELA and iQoL (b = ?.84, BCa CI [?1.66, ?.27]).

Conclusion: Highest level of individual quality of life (i.e. successful aging) was related to a moderate amount of ELA. Additionally, mental health significantly mediated this relationship. These findings suggest that some amount of ELA could be beneficial for successful aging. Resource-focused interventions are needed to improve health and promote successful aging for an underdetected, at-risk subgroup with low early-life adversity.  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