全文获取类型
收费全文 | 50922篇 |
免费 | 3155篇 |
国内免费 | 1527篇 |
专业分类
耳鼻咽喉 | 231篇 |
儿科学 | 2370篇 |
妇产科学 | 701篇 |
基础医学 | 6376篇 |
口腔科学 | 527篇 |
临床医学 | 5341篇 |
内科学 | 11222篇 |
皮肤病学 | 79篇 |
神经病学 | 6052篇 |
特种医学 | 841篇 |
外科学 | 2960篇 |
综合类 | 7847篇 |
现状与发展 | 1篇 |
一般理论 | 1篇 |
预防医学 | 1781篇 |
眼科学 | 565篇 |
药学 | 5921篇 |
10篇 | |
中国医学 | 2175篇 |
肿瘤学 | 603篇 |
出版年
2023年 | 543篇 |
2022年 | 742篇 |
2021年 | 1329篇 |
2020年 | 1264篇 |
2019年 | 1302篇 |
2018年 | 1204篇 |
2017年 | 1162篇 |
2016年 | 1209篇 |
2015年 | 1265篇 |
2014年 | 2383篇 |
2013年 | 2860篇 |
2012年 | 2319篇 |
2011年 | 2465篇 |
2010年 | 2146篇 |
2009年 | 2152篇 |
2008年 | 2284篇 |
2007年 | 2424篇 |
2006年 | 2299篇 |
2005年 | 2171篇 |
2004年 | 2003篇 |
2003年 | 1965篇 |
2002年 | 1634篇 |
2001年 | 1514篇 |
2000年 | 1299篇 |
1999年 | 1088篇 |
1998年 | 1188篇 |
1997年 | 1092篇 |
1996年 | 984篇 |
1995年 | 950篇 |
1994年 | 759篇 |
1993年 | 680篇 |
1992年 | 645篇 |
1991年 | 571篇 |
1990年 | 538篇 |
1989年 | 431篇 |
1988年 | 410篇 |
1987年 | 326篇 |
1986年 | 424篇 |
1985年 | 712篇 |
1984年 | 579篇 |
1983年 | 413篇 |
1982年 | 410篇 |
1981年 | 346篇 |
1980年 | 274篇 |
1979年 | 179篇 |
1978年 | 160篇 |
1977年 | 107篇 |
1976年 | 97篇 |
1975年 | 64篇 |
1974年 | 67篇 |
排序方式: 共有10000条查询结果,搜索用时 218 毫秒
1.
2.
《The Journal of thoracic and cardiovascular surgery》2023,165(1):94-103.e24
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
3.
4.
Jeffrey J. Silbiger 《Echocardiography (Mount Kisco, N.Y.)》2019,36(5):954-957
Secondary tricuspid regurgitation (TR) caused by right ventricular enlargement in the setting of left heart disease/pulmonary hypertension has been well described. In contrast, that associated with right atrial enlargement—atrial functional TR (AF‐TR)—remains largely underappreciated. AF‐TR most often occurs in the setting of lone atrial fibrillation, although it is also seen in its absence (idiopathic AF‐TR). Several recent studies have found that the prevalence, hemodynamic significance, and prognosis of AF‐TR are not inconsequential, suggesting increased physician awareness of this novel clinical entity is warranted. This article discusses the pathogenesis, echocardiographic findings, and treatment of this underappreciated cause of secondary TR. 相似文献
5.
6.
目的研究新生儿肺炎(NP)患儿血清高敏C反应蛋白(hs-CRP)、降钙素原(PCT)、白细胞介素-6(IL-6)水平表达及其意义。方法选取2017年1月-2018年2月韶关市曲江区妇幼保健计划生育服务中心诊治的NP患儿80例,按细菌感染情况分为观察1组和观察2组,各40例。选择同期40例健康新生儿作为对照组。测定并比较三组的hs-CRP、PCT和IL-6水平。结果观察1组血清PCT、hs-CRP和IL-6水平明显高于观察2组和对照组,差异均有统计学意义(P<0.05)。观察1组血清PCT、hs-CRP和1L-6检测阳性率明显高于观察2组和对照组,差异均有统计学意义(P<0.05),且观察1组血清PCT、hs-CRP和1L-6诊断NP的敏感度均明显高于观察2组,差异均有统计学意义(P<0.05);观察组各指标特异度与观察2组比较差异无统计学意义(P>0.05)。结论血清hs-CRP、PCT、IL-6水平可作为NP患儿的辅助鉴别指标,为抗生素的合理使用和疗效提供依据。 相似文献
7.
8.
9.
Evaluation of Adult versus Pediatric Transesophageal Echocardiography Probe Efficiency for Guiding Septal Puncture during Atrial Fibrillation Ablation
下载免费PDF全文
![点击此处可从《Echocardiography (Mount Kisco, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
10.
Provocation of Atrial Fibrillation Triggers During Ablation: Does the Use of General Anesthesia Affect Inducibility?
下载免费PDF全文
![点击此处可从《Journal of cardiovascular electrophysiology》网站下载免费的PDF全文](/ch/ext_images/free.gif)