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   25870篇
  免费   2210篇
  国内免费   613篇
耳鼻咽喉   1535篇
儿科学   487篇
妇产科学   88篇
基础医学   1468篇
口腔科学   2102篇
临床医学   3789篇
内科学   8924篇
皮肤病学   64篇
神经病学   980篇
特种医学   1055篇
外科学   2626篇
综合类   3256篇
现状与发展   1篇
预防医学   343篇
眼科学   187篇
药学   1035篇
  10篇
中国医学   353篇
肿瘤学   390篇
  2024年   41篇
  2023年   514篇
  2022年   727篇
  2021年   1237篇
  2020年   1171篇
  2019年   1233篇
  2018年   1080篇
  2017年   875篇
  2016年   799篇
  2015年   900篇
  2014年   1731篇
  2013年   1566篇
  2012年   1293篇
  2011年   1487篇
  2010年   1174篇
  2009年   1170篇
  2008年   1239篇
  2007年   1327篇
  2006年   1071篇
  2005年   1019篇
  2004年   775篇
  2003年   709篇
  2002年   563篇
  2001年   576篇
  2000年   495篇
  1999年   460篇
  1998年   381篇
  1997年   377篇
  1996年   281篇
  1995年   298篇
  1994年   244篇
  1993年   220篇
  1992年   193篇
  1991年   186篇
  1990年   155篇
  1989年   142篇
  1988年   112篇
  1987年   110篇
  1986年   109篇
  1985年   107篇
  1984年   107篇
  1983年   85篇
  1982年   94篇
  1981年   61篇
  1980年   62篇
  1979年   40篇
  1978年   34篇
  1977年   21篇
  1976年   16篇
  1974年   6篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
1.
ObjectiveNew-onset postoperative atrial fibrillation (POAF) after cardiac surgery is common, with rates up to 60%. POAF has been associated with early and late stroke, but its association with other cardiovascular outcomes is less known. The objective was to perform a meta-analysis of the studies reporting the association of POAF with perioperative and long-term outcomes in patients with cardiac surgery.MethodsWe performed a systematic review and a meta-analysis of studies that presented outcomes for cardiac surgery on the basis of the presence or absence of POAF. MEDLINE, EMBASE, and the Cochrane Library were assessed; 57 studies (246,340 patients) were selected. Perioperative mortality was the primary outcome. Inverse variance method and random model were performed. Leave-one-out analysis, subgroup analyses, and metaregression were conducted.ResultsPOAF was associated with perioperative mortality (odds ratio [OR], 1.92; 95% confidence interval [CI], 1.58-2.33), perioperative stroke (OR, 2.17; 95% CI, 1.90-2.49), perioperative myocardial infarction (OR, 1.28; 95% CI, 1.06-1.54), perioperative acute renal failure (OR, 2.74; 95% CI, 2.42-3.11), hospital (standardized mean difference, 0.80; 95% CI, 0.53-1.07) and intensive care unit stay (standardized mean difference, 0.55; 95% CI, 0.24-0.86), long-term mortality (incidence rate ratio [IRR], 1.54; 95% CI, 1.40-1.69), long-term stroke (IRR, 1.33; 95% CI, 1.21-1.46), and longstanding persistent atrial fibrillation (IRR, 4.73; 95% CI, 3.36-6.66).ConclusionsThe results suggest that POAF after cardiac surgery is associated with an increased occurrence of most short- and long-term cardiovascular adverse events. However, the causality of this association remains to be established.  相似文献   
2.
3.
4.
5.
6.
Interstitial cystitis/bladder pain syndrome (IC/BPS) and vulvodynia are chronic pain syndromes that appear to be intertwined from the perspectives of embryology, pathology and epidemiology. These associations may account for similar responses to various therapies.  相似文献   
7.
This article was designed to provide a pediatric cardiac computed tomography angiography (CCTA) expert panel consensus based on opinions of experts of the Société Française d’Imagerie Cardiaque et Vasculaire diagnostique et interventionnelle (SFICV) and of the Filiale de Cardiologie Pédiatrique Congénitale (FCPC). This expert panel consensus includes recommendations for indications, patient preparation, CTA radiation dose reduction techniques, and post-processing techniques. The consensus was based on data from available literature (original papers, reviews and guidelines) and on opinions of a group of specialists with extensive experience in the use of CT imaging in congenital heart disease. In order to reach high potential and avoid pitfalls, CCTA in children with congenital heart disease requires training and experience. Moreover, pediatric cardiac CCTA protocols should be standardized to acquire optimal images in this population with the lowest radiation dose possible to prevent unnecessary radiation exposure. We also provided a suggested structured report and a list of acquisition protocols and technical parameters in relation to specific vendors.  相似文献   
8.
The present study sought to investigate the association between social phobia symptoms and self‐reported physical symptoms and the moderation effect of resting respiratory sinus arrhythmia (RSA) on this link. Data of 5‐min resting RSA, social phobia symptoms assessed by the Social Phobia Scale, and physical symptoms assessed by the Cohen–Hoberman Inventory of Physical Symptoms were collected from 167 undergraduate students. Results indicated that higher levels of social phobia symptoms were associated with higher levels of self‐reported physical symptoms. Resting RSA played the moderating role in the link between social phobia symptoms and self‐reported physical symptoms, such that social phobia symptoms were positively associated with self‐reported physical symptoms among individuals with low resting RSA, whereas this association was nonsignificant among individuals with high resting RSA. These findings suggest that high resting RSA as a physiological marker of better self‐regulation capacity might buffer the effect of social phobia symptoms on physical health.  相似文献   
9.
We present a patient with both dynamic left ventricular outflow tract obstruction and valvular aortic stenosis. The aortic valve was calcified, and velocities and gradients measured by continuous‐wave Doppler met standard criteria for severe aortic stenosis. The increased subvalvular velocities invalidated assumptions of the simplified Bernoulli equation; correction using the longer form of the Bernoulli equation suggested a lower but still significant gradient. The complex shape of the subvalvular spectral Doppler envelope indicated supranormal systolic function and dynamic left ventricular outflow obstruction. Left heart catheterization with an end‐hole catheter was required to determine the subvalvular and valvular components of the obstruction.  相似文献   
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