全文获取类型
收费全文 | 911篇 |
免费 | 19篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 9篇 |
儿科学 | 39篇 |
妇产科学 | 8篇 |
基础医学 | 84篇 |
口腔科学 | 39篇 |
临床医学 | 135篇 |
内科学 | 254篇 |
皮肤病学 | 18篇 |
神经病学 | 53篇 |
特种医学 | 14篇 |
外科学 | 100篇 |
综合类 | 21篇 |
预防医学 | 49篇 |
眼科学 | 18篇 |
药学 | 60篇 |
中国医学 | 18篇 |
肿瘤学 | 16篇 |
出版年
2023年 | 12篇 |
2022年 | 7篇 |
2021年 | 12篇 |
2020年 | 13篇 |
2019年 | 117篇 |
2018年 | 133篇 |
2017年 | 43篇 |
2016年 | 7篇 |
2015年 | 16篇 |
2014年 | 81篇 |
2013年 | 50篇 |
2012年 | 30篇 |
2011年 | 38篇 |
2010年 | 32篇 |
2009年 | 21篇 |
2008年 | 40篇 |
2007年 | 39篇 |
2006年 | 20篇 |
2005年 | 12篇 |
2004年 | 11篇 |
2003年 | 10篇 |
2002年 | 10篇 |
2001年 | 4篇 |
2000年 | 4篇 |
1999年 | 2篇 |
1998年 | 2篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1994年 | 1篇 |
1993年 | 3篇 |
1991年 | 2篇 |
1989年 | 2篇 |
1985年 | 29篇 |
1984年 | 25篇 |
1983年 | 11篇 |
1982年 | 20篇 |
1981年 | 17篇 |
1980年 | 15篇 |
1979年 | 19篇 |
1978年 | 9篇 |
1977年 | 5篇 |
1976年 | 4篇 |
1975年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有935条查询结果,搜索用时 0 毫秒
81.
82.
Wan Kee Kim Ho Jin Kim Joon Bum Kim Sung-Ho Jung Suk Jung Choo Cheol Hyun Chung Jae Won Lee 《The Journal of thoracic and cardiovascular surgery》2019,157(4):1519-1528.e5
Objective
Efficacy of atrial fibrillation ablation in rheumatic mitral valve disease has been regarded inferior to that in nonrheumatic diseases. This study aimed to evaluate net clinical benefits by the addition of concomitant atrial fibrillation ablation in rheumatic mitral valve surgery.Methods
Among 1229 consecutive patients with atrial fibrillation from 1997 to 2016 (54.4 ± 11.7 years; 68.2% were female), 812 (66.1%) received concomitant ablation of atrial fibrillation (ablation group), and 417 (33.9%) underwent valve surgery alone (no ablation group). Death and thromboembolic events were compared between these groups. Mortality was regarded as a competing risk to evaluate thromboembolic outcomes. To reduce selection bias, inverse probability of treatment weighting methods were performed.Results
Freedom from atrial fibrillation occurrence at 5 years was 76.5% ± 1.8% and 5.3% ± 1.1% in the ablation and no ablation groups, respectively (P < .001). The ablation group had significantly lower risks for death (hazard ratio [HR], 0.69; 95% confidence interval [CI], 0.52-0.93) and thromboembolic events (HR, 0.49; 95% CI, 0.32-0.76) than the no ablation group. Time-varying Cox analysis revealed that the occurrence of stroke after surgery was significantly associated with death (HR, 3.97; 95% CI, 2.36-6.69). In subgroup analyses, the reduction in the composite risk of death and thromboembolic events was observed in all mechanical (n = 829; HR, 0.53; 95% CI, 0.39-0.73), bioprosthetic replacement (n = 239; HR, 0.67; 95% CI, 0.41-1.08), and repair (n = 161; HR, 0.17; 95% CI, 0.06-0.52) subgroups (P for interaction = .47).Conclusions
Surgical atrial fibrillation ablation during rheumatic mitral valve surgery was associated with a lower risk of long-term mortality and thromboembolic events. Therefore, atrial fibrillation ablation for rheumatic mitral valve disease may be a reasonable option. 相似文献83.
84.
K.S. Flannagan M. Ramírez-Zea A.V. Roman A.K. Das E. Villamor 《Nutrition, metabolism, and cardiovascular diseases : NMCD》2018,28(12):1237-1244
Background and aims
Polyunsaturated fatty acids (PUFA) may play a role in the etiology of the metabolic syndrome (MetS). The aim of the study was to examine the associations of adipose tissue PUFA biomarkers with MetS among parents and children in Mesoamerica.Method and results
We conducted a cross-sectional study among 468 parents and 201 children aged 7–12 y from the capital cities of Guatemala, El Salvador, the Dominican Republic, Honduras, Nicaragua, Panama, Costa Rica, and Belize, and Tuxtla Gutiérrez in Mexico. We measured PUFA biomarkers in gluteal adipose tissue by gas chromatography. In adults, MetS was defined according to the National Cholesterol Education Program's Adult Treatment Panel III definition. In children, we created an age- and sex-standardized metabolic risk score using abdominal circumference, the homeostasis model of insulin resistance, blood pressure, serum HDL cholesterol, and triglycerides. We estimated prevalence ratios of MetS and mean differences in metabolic score across quartiles of PUFA using multivariable-adjusted Poisson and linear regression models, respectively. Among adults, MetS was associated with low alpha-linolenic acid (ALA), high eicosapentaenoic acid (EPA), and low gamma-linolenic acid (GLA). It was linearly, positively associated with dihomo-gamma-linolenic acid (DGLA) and estimated Δ6-desaturase (D6D) activity. Among children, the metabolic score was positively associated with docosapentaenoic acid (DPA), DGLA, and D6D activity.Conclusions
Among Mesoamerican adults, MetS prevalence is inversely associated with adipose tissue ALA and GLA, and positively associated with EPA, DGLA, and the D6D index. Among children, metabolic risk score is positively associated with DPA, DGLA, and the D6D index. 相似文献85.
Hiroki Ikenaga Jun Yoshida Atsushi Hayashi Takafumi Nagaura Satoshi Yamaguchi Florian Rader Robert J. Siegel Saibal Kar Takahiro Shiota 《JACC: Cardiovascular Interventions》2019,12(2):140-150
Objectives
The aim of this study was to determine the prognostic value of pulmonary venous (PV) flow during MitraClip implantation.Background
The clinical significance of PV flow information during MitraClip implantation is unknown.Methods
A total of 300 patients who underwent MitraClip implantation and in whom the measurement of PV flow was completed using intraprocedural transesophageal echocardiography were retrospectively reviewed. The optimal threshold of the ratio of systolic velocity-time integral (Svti) to diastolic velocity-time integral (Dvti) ratio after MitraClip placement for major adverse cardiovascular events (all-cause death, redo MitraClip implantation, mitral valve surgery, and heart transplantation) during 12 months was assessed. The best cutoff ratio was 0.72. Patients were divided into 2 groups using this cutoff ratio (low Svti/Dvti, n = 91; high Svti/Dvti, n = 209).Results
Following mitral regurgitation reduction by MitraClip placement, Svti increased in the both groups. The frequency of mitral regurgitation 3/4+ immediately after MitraClip implantation, at 1-month follow-up, and at 12-month follow-up was significantly higher in patients with low Svti/Dvti ratios than in those with high Svti/Dvti ratios (after MitraClip placement, 5.5% vs. 0%; p < 0.001; at 1 month; 26% vs. 5.2%; p < 0.001; at 12 months, 18% vs. 5.3%; p = 0.006). Major adverse cardiovascular events during 12 months were significantly higher in patients with low Svti/Dvti ratios than in those with high Svti/Dvti ratios (23% vs. 6.2%; p < 0.001). Multivariate analysis demonstrated that low Svti/Dvti ratio was significantly associated with major adverse cardiovascular events during 12 months after adjustment for age, baseline renal function, and mean transmitral pressure gradient (adjusted hazard ratio: 4.00; 95% confidence interval: 2.02 to 8.23; p < 0.001).Conclusions
PV flow information in the catheterization laboratory immediately after MitraClip implantation predicted recurrent mitral regurgitation and worse long-term outcomes. 相似文献86.
87.
88.
89.
Laura D’Erasmo Ilenia Minicocci Antonio Nicolucci Paolo Pintus Janine E. Roeters Van Lennep Luis Masana Pedro Mata Rosa Maria Sánchez-Hernández Pablo Prieto-Matos Josè T. Real Juan F. Ascaso Eduardo Esteve Lafuente Miguel Pocovi Francisco J. Fuentes Sandro Muntoni Stefano Bertolini Cesare Sirtori Laura Calabresi Marcello Arca 《Journal of the American College of Cardiology》2018,71(3):279-288
Background
Autosomal recessive hypercholesterolemia (ARH) is a rare lipid disorder characterized by premature atherosclerotic cardiovascular disease (ASCVD). There are sparse data for clinical management and cardiovascular outcomes in ARH.Objectives
Evaluation of changes in lipid management, achievement of low-density lipoprotein cholesterol (LDL-C) goals and cardiovascular outcomes in ARH.Methods
Published ARH cases were identified by electronic search. All corresponding authors and physicians known to treat these patients were asked to provide follow-up information, using a standardized protocol.Results
We collected data for 52 patients (28 females, 24 males; 31.1 ± 17.1 years of age; baseline LDL-C: 571.9 ± 171.7 mg/dl). During a mean follow-up of 14.1 ± 7.3 years, there was a significant increase in the use of high-intensity statin and ezetimibe in combination with lipoprotein apheresis; in 6 patients, lomitapide was also added. Mean LDL-C achieved at nadir was 164.0 ± 85.1 mg/dl (?69.6% from baseline), with a better response in patients taking lomitapide (?88.3%). Overall, 23.1% of ARH patients reached LDL-C of <100 mg/dl. During follow-up, 26.9% of patients had incident ASCVD, and 11.5% had a new diagnosis of aortic valve stenosis (absolute risk per year of 1.9% and 0.8%, respectively). No incident stroke was observed. Age (≥30 years) and the presence of coronary artery disease at diagnosis were the major predictors of incident ASCVD.Conclusions
Despite intensive treatment, LDL-C in ARH patients remains far from targets, and this translates into a poor long-term cardiovascular prognosis. Our data highlight the importance of an early diagnosis and treatment and confirm the fact that an effective treatment protocol for ARH is still lacking. 相似文献90.
We have shown that bipolar individuals have reduced quality diets, including lower intake of polyunsaturated fatty acids (PUFA). We have also reported reduced plasma levels of the n-6 PUFA, linoleic acid (LA), and the n-3 PUFA, eicosapentaenoic acid (EPA) in bipolar subjects. In the current analysis we hypothesized that LA and EPA plasma levels would mediate lower self-reported mental health and life functioning scores in bipolar subjects. In a cross-sectional study, we collected a 7-day diet record in bipolar (n = 56) and control subjects (n = 46) followed by a fasted blood draw. We used structured equation modeling path analysis to test for mediating effects of dietary intake and plasma levels of LA and EPA on self-reported mental health questionnaire scores, including the Life Functioning Questionnaire (LFQ), the Patient Health Questionnaire (PHQ9), and the Short Form Health Survey (SF12), extracting the mental health component summary score (SF12-MH). We adjusted for age, gender, psychiatric medication use, body mass index (BMI), and total caloric intake as covariates with bipolar disorder as the primary predictor. We found a significant path association from bipolar disorder to lower plasma LA levels (p = 0.03) and significant paths from plasma LA to PHQ9 (p = 0.05), LFQ (p = 0.01) and SF12-MH (p = 0.05) scores, such that lower plasma LA predicted worse outcomes. We found no significant paths from plasma EPA levels to any of the outcome measures. These findings suggest that plasma LA levels partially mediate the effect of bipolar disorder on self-reported measures of mental health and life functioning. 相似文献