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   1697篇
  免费   71篇
  国内免费   8篇
耳鼻咽喉   14篇
妇产科学   5篇
基础医学   53篇
口腔科学   39篇
临床医学   295篇
内科学   403篇
皮肤病学   6篇
神经病学   178篇
特种医学   9篇
外科学   191篇
综合类   123篇
预防医学   182篇
眼科学   2篇
药学   62篇
中国医学   17篇
肿瘤学   197篇
  2024年   7篇
  2023年   49篇
  2022年   77篇
  2021年   104篇
  2020年   104篇
  2019年   166篇
  2018年   169篇
  2017年   99篇
  2016年   77篇
  2015年   61篇
  2014年   127篇
  2013年   130篇
  2012年   50篇
  2011年   118篇
  2010年   43篇
  2009年   62篇
  2008年   54篇
  2007年   49篇
  2006年   30篇
  2005年   29篇
  2004年   25篇
  2003年   16篇
  2002年   11篇
  2001年   9篇
  2000年   13篇
  1999年   4篇
  1998年   3篇
  1997年   8篇
  1996年   8篇
  1995年   3篇
  1994年   7篇
  1993年   4篇
  1992年   6篇
  1991年   7篇
  1990年   4篇
  1989年   3篇
  1988年   3篇
  1987年   2篇
  1986年   3篇
  1985年   1篇
  1984年   4篇
  1983年   5篇
  1982年   8篇
  1981年   2篇
  1980年   5篇
  1979年   2篇
  1978年   2篇
  1977年   1篇
  1976年   1篇
  1974年   1篇
排序方式: 共有1776条查询结果,搜索用时 15 毫秒
21.
22.
BackgroundMalnutrition measured by the geriatric nutritional risk index (GNRI) was reported to be associated with poor prognosis for patients with peripheral artery disease (PAD). However, the optimal cut-off value of preprocedural GNRI for critical limb ischemia (CLI) and intermittent claudication (IC) is unknown. We aimed to determine its optimal cut-off value for CLI or IC patients requiring endovascular revascularization.MethodsWe explored data of 2246 patients (CLI: n = 1061, IC: n = 1185) registered in the Tokyo-taMA peripheral vascular intervention research COmraDE (TOMA-CODE) registry, which prospectively enrolled consecutive PAD patients who underwent endovascular revascularization in 34 hospitals in Japan from August 2014 to August 2016. The optimal cut-off values of GNRI were assessed by the survival classification and regression tree (CART) analyses, and the survival curve analyses for major adverse cardiovascular and limb events (MACLEs) were performed for these cut-off values.ResultsIn addition to the first cut-off value of 96.2 in CLI and 85.6 in IC, the survival CART provided an additional cut-off value of 78.2 in CLI and 106.0 in IC for further risk stratification. The survival curve was significantly stratified by the GNRI-based malnutrition status in both CLI [high risk: 47.7% (51/107), moderate: 30.1% (118/392), and low: 10.2% (53/520), log–rank p < 0.001] and IC [high risk: 14.3% (7/49), moderate: 4.5% (29/646), and low: 0.5% (2/407), log–rank p < 0.001]. The multivariate Cox-proportional hazard analysis showed that a higher GNRI was significantly associated with a better outcome in both CLI [hazard ratio (HR) per 1-point increase: 0.97, 95% CI: 0.96–0.98, p < 0.001] and IC (HR: 0.94, 95% CI: 0.91–0.97, p < 0.001).ConclusionsPreprocedural nutritional status significantly stratified future events in patients with PAD. Given that the optimal cut-off value of GNRI in CLI was almost 10-points lower than that of IC, using a disease-specific cut-off value is important for risk stratification.  相似文献   
23.
24.
25.
《Clinical gerontologist》2013,36(3-4):115-125
Abstract

We evaluated the validity of the 1-, 4- and 15-item versions of the GDS in 51 patients affected by mild to moderate dementia, using the long form as standard. The following sensitivity and specificity values were obtained: 66% and 91% for GDS-1, 93% and 87% for GDS-4, 79% and 100% for GDS-15. GDS-15 also showed good agreement with GDS-30 in defining the severity of depression. These findings support the use of GDS-4 for the screening of depression and of GDS-15 for its severity assessment.  相似文献   
26.
27.
《Injury》2018,49(2):404-408
ObjectivesEvaluate whether mortality after discharge is elevated in geriatric fracture patients whose lower extremity weight-bearing is restricted.DesignRetrospective cohort studySettingUrban Level 1 trauma centerPatients/participants1746 patients >65 years of ageInterventionPost-operative lower extremity weight-bearing statusMain outcome measureMortality, as determined by the Social Security Death IndexResultsUnivariate analysis demonstrated that patients who were weight-bearing as tolerated on bilateral lower extremities (BLE) had significantly higher 5-year mortality compared to patients with restricted weight-bearing on one lower extremity and restricted weight-bearing on BLE (30%, 21% and 22% respectively, p < 0.001). Cox regression analysis controlling for variables including age, Charlson Comorbidity Index, Injury Severity Scale, combined UE/LE injury, injury mechanism (high vs low), sex, BMI and GCS demonstrated that, in comparison to patients who were weight bearing as tolerated on BLE, restricted weight-bearing on one lower extremity had a hazard ratio (HR) of 0.97 (95% confidence interval 0.78 to 1.20, p = 0.76) and restricted weight-bearing in BLE had a HR of 0.91 (95% confidence interval 0.60 to 1.36, p = 0.73).ConclusionsIn geriatric patients, prescribed weight-bearing status did not have a statistically significant association with mortality after discharge, when controlling for age, sex, body mass index, medical comorbidities, Injury Severity Scale (ISS), mechanism of injury, nonoperative treatment and admission GCS. This remained true in when the analysis was restricted to operative injuries only.  相似文献   
28.
29.
30.
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