全文获取类型
收费全文 | 2274篇 |
免费 | 136篇 |
国内免费 | 5篇 |
专业分类
耳鼻咽喉 | 15篇 |
儿科学 | 49篇 |
妇产科学 | 218篇 |
基础医学 | 285篇 |
口腔科学 | 32篇 |
临床医学 | 154篇 |
内科学 | 526篇 |
皮肤病学 | 43篇 |
神经病学 | 80篇 |
特种医学 | 41篇 |
外科学 | 205篇 |
综合类 | 92篇 |
一般理论 | 3篇 |
预防医学 | 108篇 |
眼科学 | 193篇 |
药学 | 210篇 |
中国医学 | 10篇 |
肿瘤学 | 151篇 |
出版年
2023年 | 6篇 |
2022年 | 24篇 |
2021年 | 82篇 |
2020年 | 44篇 |
2019年 | 50篇 |
2018年 | 69篇 |
2017年 | 42篇 |
2016年 | 55篇 |
2015年 | 65篇 |
2014年 | 79篇 |
2013年 | 88篇 |
2012年 | 198篇 |
2011年 | 197篇 |
2010年 | 87篇 |
2009年 | 56篇 |
2008年 | 127篇 |
2007年 | 138篇 |
2006年 | 145篇 |
2005年 | 133篇 |
2004年 | 112篇 |
2003年 | 103篇 |
2002年 | 72篇 |
2001年 | 48篇 |
2000年 | 65篇 |
1999年 | 46篇 |
1998年 | 20篇 |
1997年 | 21篇 |
1996年 | 15篇 |
1995年 | 14篇 |
1994年 | 8篇 |
1993年 | 19篇 |
1992年 | 21篇 |
1991年 | 18篇 |
1990年 | 18篇 |
1989年 | 24篇 |
1988年 | 19篇 |
1987年 | 9篇 |
1986年 | 17篇 |
1985年 | 8篇 |
1984年 | 10篇 |
1983年 | 4篇 |
1981年 | 5篇 |
1979年 | 4篇 |
1978年 | 3篇 |
1977年 | 5篇 |
1973年 | 2篇 |
1970年 | 4篇 |
1969年 | 4篇 |
1968年 | 2篇 |
1967年 | 3篇 |
排序方式: 共有2415条查询结果,搜索用时 500 毫秒
71.
Although the concept of extracorporeal membrane oxygenation (ECMO) has remained unchanged, component technology has evolved considerably over the past three decades. Presently the clinical conditions requiring ECMO support have been updated with input from the outcome data of patient registries. Modern circuit configuration has become less cumbersome, safer, and more efficient. Technological advances now allow prolonged support with fewer complications compared to the past eras and facilitate transition to a single bedside caregiver model, similar to hemofiltration or ventricular-assist devices. The clinical considerations and indicators for placing the patient on ECMO, the various circuit configurations, clinical and technical issues, and management aspects are considered in this article. 相似文献
72.
Yap SC Harris L Downar E Nanthakumar K Silversides CK Chauhan VS 《Journal of cardiovascular electrophysiology》2012,23(4):339-345
Atrial Remodeling After the Fontan Operation. Introduction: The prevalence of intra‐atrial reentrant tachycardia (IART) increases with age in Fontan patients. This study aimed to characterize the atrial electroanatomic substrate for IART late after Fontan surgery. Methods and Results: Detailed electroanatomic mapping of the right atrium (RA) was performed in 11 consecutive patients (33 ± 9 years) with older style Fontan circulation (atriopulmonary and atrioventricular connection) who underwent their first radiofrequency catheter ablation (RFCA) for IART. A comparative group of 30 non‐Fontan congenital heart disease (CHD) patients were also studied. Fontan patients had larger RA (P = 0.004), larger low‐voltage area ≤0.5 mV (P = 0.01), and more fractionated potentials (P < 0.001) than non‐Fontan CHD patients. RA enlargement correlated significantly with both low‐voltage zones (Spearman ρ= 0.68, P < 0.001) and fractionated potentials (Spearman ρ= 0.48, P = 0.001). Among Fontan patients, both age and time since Fontan surgery were significantly correlated to the amount of low‐voltage areas (Spearman ρ= 0.87, P < 0.001; Spearman ρ= 0.63, P = 0.04, respectively). Successful RFCA was accomplished in 30 (73%) patients and was less likely in Fontan patients (54% vs 83%, P = 0.04). Larger RA was significantly associated with a lower success rate (P = 0.04). During a follow‐up duration of 2.3 ± 1.6 years, IART recurred in 47% of patients. Larger RA size and larger low‐voltage areas predicted IART recurrence after RFCA. Conclusion: Fontan patients demonstrate progressive adverse atrial electrical remodeling with increasing age and time since surgery. Newer strategies beyond surgical incisions, such as pharmacotherapies that retard the progression of atrial fibrosis, may be required to reduce the long‐term risk of atrial arrhythmias. 相似文献
73.
74.
75.
76.
77.
78.
Young Hwii Ko Rafael F. Coelho Ananthakrishnan Sivaraman Oscar Schatloff Sanket Chauhan Haidar M. Abdul-Muhsin Rair Jose Valero Carrion Kenneth J. Palmer Jun Cheon Vipul R. Patel 《European urology》2013
Background
Although the retrograde approach to nerve sparing (NS) aimed at maximizing NS during robot-assisted radical prostatectomy (RARP) has been described, its significant benefits compared to the antegrade approach have not yet been investigated.Objective
To evaluate the impact of NS approaches on perioperative, pathologic, and functional outcomes.Design, setting, and participants
Five hundred one potent (Sexual Health Inventory for Men [SHIM] score >21) men underwent bilateral full NS and were followed up for a minimum of 1 yr. After propensity score matching, 344 patients were selected and were then categorized into two groups.Surgical procedure
RARP with antegrade NS (n = 172) or RARP with retrograde NS (n = 172).Outcome measurements and statistical analysis
Functional outcomes were assessed using validated questionnaires. Multivariable logistic regression models were applied.Results and limitations
Positive margin rates were similar (11.1% vs 6.9%; p = 0.192), and no correlation with the NS approach was found on regression analysis. At 3, 6, and 9 mo, the potency rate was significantly higher in the retrograde approach (65% vs 80.8% and 72.1% vs 90.1% and 85.3% vs 92.9%, respectively). The multivariable model indicated that the NS approach was an independent predictor for potency recovery at 3, 6, and 9 mo, along with age, gland size, and hyperlipidemia. After adjusting for these predictors, the hazard ratio (HR) for the retrograde relative to the antegrade approach was 2.462 (95% confidence interval [CI], 1.482–4.089; p = 0.001) at 3, 4.024 (95% CI, 2.171–7.457; p < 0.001) at 6, and 2.145 (95% CI, 1.019–4.514; p = 0.044) at 9 mo. Regarding continence, the recovery rates at each time point and the mean time to regaining it were similar, and the method of NS had no effect on multivariable analysis. The absence of randomization is a major limitation of this study.Conclusions
In patients with normal erectile function who underwent bilateral full NS, a retrograde NS approach facilitated early recovery of potency compared to that with an antegrade NS approach without compromising cancer control. 相似文献79.