全文获取类型
| 收费全文 | 5114126篇 |
| 免费 | 365593篇 |
| 国内免费 | 11457篇 |
专业分类
| 耳鼻咽喉 | 73417篇 |
| 儿科学 | 164769篇 |
| 妇产科学 | 139911篇 |
| 基础医学 | 721539篇 |
| 口腔科学 | 149055篇 |
| 临床医学 | 477796篇 |
| 内科学 | 967957篇 |
| 皮肤病学 | 113950篇 |
| 神经病学 | 418379篇 |
| 特种医学 | 194645篇 |
| 外国民族医学 | 1770篇 |
| 外科学 | 761058篇 |
| 综合类 | 115823篇 |
| 现状与发展 | 16篇 |
| 一般理论 | 2283篇 |
| 预防医学 | 416253篇 |
| 眼科学 | 122495篇 |
| 药学 | 378938篇 |
| 18篇 | |
| 中国医学 | 9953篇 |
| 肿瘤学 | 261151篇 |
出版年
| 2018年 | 55509篇 |
| 2017年 | 42244篇 |
| 2016年 | 48010篇 |
| 2015年 | 54174篇 |
| 2014年 | 76708篇 |
| 2013年 | 117120篇 |
| 2012年 | 157154篇 |
| 2011年 | 167408篇 |
| 2010年 | 100516篇 |
| 2009年 | 95199篇 |
| 2008年 | 156616篇 |
| 2007年 | 166560篇 |
| 2006年 | 168243篇 |
| 2005年 | 163131篇 |
| 2004年 | 156993篇 |
| 2003年 | 151063篇 |
| 2002年 | 147011篇 |
| 2001年 | 221908篇 |
| 2000年 | 228437篇 |
| 1999年 | 194273篇 |
| 1998年 | 60049篇 |
| 1997年 | 52695篇 |
| 1996年 | 51985篇 |
| 1995年 | 50020篇 |
| 1994年 | 46348篇 |
| 1993年 | 43632篇 |
| 1992年 | 154563篇 |
| 1991年 | 150776篇 |
| 1990年 | 146501篇 |
| 1989年 | 141991篇 |
| 1988年 | 131467篇 |
| 1987年 | 129302篇 |
| 1986年 | 122545篇 |
| 1985年 | 117923篇 |
| 1984年 | 89029篇 |
| 1983年 | 76275篇 |
| 1982年 | 46094篇 |
| 1981年 | 41621篇 |
| 1979年 | 83216篇 |
| 1978年 | 59228篇 |
| 1977年 | 50232篇 |
| 1976年 | 47508篇 |
| 1975年 | 50466篇 |
| 1974年 | 61078篇 |
| 1973年 | 58512篇 |
| 1972年 | 55504篇 |
| 1971年 | 51930篇 |
| 1970年 | 48263篇 |
| 1969年 | 45958篇 |
| 1968年 | 42399篇 |
排序方式： 共有10000条查询结果，搜索用时 15 毫秒
21.
Background
Total knee arthroplasty is a treatment option for debilitating arthritis. In the postoperative period, patients experience moderate to severe pain affecting the rehabilitation, hospital stay, and patient satisfaction. This study aims at utilizing current best evidence to determine whether adductor canal block (ACB) or periarticular injection (PAI) is a better modality for managing short-term postoperative pain and opioid consumption.Methods
Embase, MEDLINE, HealthStar, Emcare, and PubMed were searched for randomized controlled trials from 1946 to August 2018, for literature addressing the comparison of ACB and PAI for pain management in the setting of total knee arthroplasty. A systematic review and meta-analysis were performed.Results
Six studies were included in our meta-analysis. When examining the combined visual analog scale (VAS) pain values for each group, analysis demonstrated greater reduction in scores for the PAI group, and the difference was statistically significant (P = .001). When comparing the VAS scores of subgroups analyzed at specific periods in time, there was a trend toward lower VAS scores in subgroups analyzed at 24 hours and 48 hours postoperatively (at rest and at movement) in the PAI group. Overall opioid consumption was lower in the PAI group, with demonstrated statistical significance (P = .03). When comparing the postoperative subgroups, there was a trend toward decreased opioid use in the PAI group, with 13.25% less opioid use at 48 hours and 9.5% less opioid use at 24 hours.Conclusion
PAI could significantly improve postoperative pain and opioid consumption when compared with ACB. Additional, high-quality studies are required to further address this topic. 相似文献22.
Stress Testing Versus CT Angiography in Patients With Diabetes and Suspected Coronary Artery Disease
Abhinav Sharma Adrian Coles Nishant K. Sekaran Neha J. Pagidipati Michael T. Lu Daniel B. Mark Kerry L. Lee Hussein R. Al-Khalidi Udo Hoffmann Pamela S. Douglas 《Journal of the American College of Cardiology》2019,73(8):893-902
Background
The optimal noninvasive test (NIT) for patients with diabetes and stable symptoms of coronary artery disease (CAD) is unknown.Objectives
The purpose of this study was to assess whether a diagnostic strategy based on coronary computed tomographic angiography (CTA) is superior to functional stress testing in reducing adverse cardiovascular (CV) outcomes (CV death or myocardial infarction [MI]) among symptomatic patients with diabetes.Methods
PROMISE (Prospective Multicenter Imaging Study for Evaluation of Chest Pain) was a randomized trial evaluating an initial strategy of CTA versus functional testing in stable outpatients with symptoms suggestive of CAD. The study compared CV outcomes in patients with diabetes (n = 1,908 [21%]) and without diabetes (n = 7,058 [79%]) based on their randomization to CTA or functional testing.Results
Patients with diabetes (vs. without) were similar in age (median 61 years vs. 60 years) and sex (female 54% vs. 52%) but had a greater burden of CV comorbidities. Patients with diabetes who underwent CTA had a lower risk of CV death/MI compared with functional stress testing (CTA: 1.1% [10 of 936] vs. stress testing: 2.6% [25 of 972]; adjusted hazard ratio: 0.38; 95% confidence interval: 0.18 to 0.79; p = 0.01). There was no significant difference in nondiabetic patients (CTA: 1.4% [50 of 3,564] vs. stress testing: 1.3% [45 of 3,494]; adjusted hazard ratio: 1.03; 95% confidence interval: 0.69 to 1.54; p = 0.887; interaction term for diabetes p value = 0.02).Conclusions
In diabetic patients presenting with stable chest pain, a CTA strategy resulted in fewer adverse CV outcomes than a functional testing strategy. CTA may be considered as the initial diagnostic strategy in this subgroup. (PROspective Multicenter Imaging Study for Evaluation of Chest Pain [PROMISE]; NCT01174550) 相似文献23.
Adilson Cunha Ferreira Edward Araujo Júnior Wellington P. Martins João Francisco Jordão Antônio Hélio Oliani Simon E. Meagher 《The journal of maternal-fetal & neonatal medicine》2015,28(14):1706-1710
Objective: To assess the quality of images and video clips of fetal central nervous (CNS) structures obtained by ultrasound and transmitted via tele-ultrasound from Brazil to Australia.Methods: In this cross-sectional study, 15 normal singleton pregnant women between 20 and 26 weeks were selected. Fetal CNS structures were obtained by images and video clips. The exams were transmitted in real-time using a broadband internet and an inexpensive video streaming device. Four blinded examiners evaluated the quality of the exams using the Likert scale. We calculated the mean, standard deviation, mean difference, and p values were obtained from paired t tests.Results: The quality of the original video clips was slightly better than that observed by the transmitted video clips; mean difference considering all observers = 0.23 points. In 47/60 comparisons (78.3%; 95% CI?=?66.4–86.9%) the quality of the video clips were judged to be the same. In 182/240 still images (75.8%; 95% CI?=?70.0–80.8%) the scores of transmitted image were considered the same as the original.Conclusion: We demonstrated that long distance tele-ultrasound transmission of fetal CNS structures using an inexpensive video streaming device provided images of subjective good quality. 相似文献
24.
25.
26.
27.
28.
29.
30.
Daniel J. Snyder Thomas R. Kroshus Aakash Keswani Evan B. Garden Karl M. Koenig Kevin J. Bozic David S. Jevsevar Jashvant Poeran Calin S. Moucha 《The Journal of arthroplasty》2019,34(4):613-618