全文获取类型
收费全文 | 2994231篇 |
免费 | 222526篇 |
国内免费 | 5736篇 |
专业分类
耳鼻咽喉 | 40485篇 |
儿科学 | 97982篇 |
妇产科学 | 82584篇 |
基础医学 | 425307篇 |
口腔科学 | 89549篇 |
临床医学 | 265282篇 |
内科学 | 581078篇 |
皮肤病学 | 66470篇 |
神经病学 | 237527篇 |
特种医学 | 114671篇 |
外国民族医学 | 699篇 |
外科学 | 448842篇 |
综合类 | 70573篇 |
现状与发展 | 6篇 |
一般理论 | 1032篇 |
预防医学 | 234545篇 |
眼科学 | 71369篇 |
药学 | 223592篇 |
9篇 | |
中国医学 | 6759篇 |
肿瘤学 | 164132篇 |
出版年
2018年 | 33603篇 |
2017年 | 25422篇 |
2016年 | 27832篇 |
2015年 | 31794篇 |
2014年 | 43494篇 |
2013年 | 65009篇 |
2012年 | 90686篇 |
2011年 | 95632篇 |
2010年 | 55895篇 |
2009年 | 51750篇 |
2008年 | 88936篇 |
2007年 | 94387篇 |
2006年 | 94978篇 |
2005年 | 91458篇 |
2004年 | 88892篇 |
2003年 | 84707篇 |
2002年 | 82129篇 |
2001年 | 143193篇 |
2000年 | 147608篇 |
1999年 | 123351篇 |
1998年 | 33239篇 |
1997年 | 29480篇 |
1996年 | 29409篇 |
1995年 | 28400篇 |
1994年 | 26397篇 |
1993年 | 24544篇 |
1992年 | 97369篇 |
1991年 | 94522篇 |
1990年 | 91713篇 |
1989年 | 88366篇 |
1988年 | 81475篇 |
1987年 | 79841篇 |
1986年 | 75936篇 |
1985年 | 72914篇 |
1984年 | 53975篇 |
1983年 | 46400篇 |
1982年 | 26696篇 |
1981年 | 23883篇 |
1979年 | 50296篇 |
1978年 | 34649篇 |
1977年 | 29525篇 |
1976年 | 27678篇 |
1975年 | 29422篇 |
1974年 | 35960篇 |
1973年 | 34598篇 |
1972年 | 32002篇 |
1971年 | 30057篇 |
1970年 | 27803篇 |
1969年 | 26136篇 |
1968年 | 24165篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
21.
Spyridon G. Deftereos Dimitrios A. Vrachatis Christos Angelidis Agathi-Rosa Vrettou Eleni K. Sarri Sotiria G. Giotaki Efthymia Varytimiadi Charalampos Kossyvakis Eleana Kotsia Gerasimos S. Deftereos Konstantinos Doudoumis Georgios Giannopoulos 《Clinical therapeutics》2019,41(1):21-29
Purpose
The goal of this review was to summarize, analyze, and compare trials studying the efficacy of colchicine in the prevention of atrial fibrillation (AF) post-operatively (POAF) and post–catheter ablation. Ongoing studies and current guidelines are also presented and reviewed.Methods
Published studies on the field were identified through a literature search of the PubMed and clinicaltrials.gov databases.Findings
Four original studies regarding POAF, two original studies regarding post–catheter ablation AF, and six meta-analyses were identified. In addition, the 3 most recent guidelines/expert consensus documents were scrutinized.Implications
AF occurs frequently after cardiac surgery (POAF) and catheter pulmonary vein isolation (postablation AF) and is associated with increased cardiovascular morbidity. A number of trials over the last few years have investigated the role of colchicine in the prevention of POAF and postablation AF targeting the local and systemic inflammatory process that leads to initiation and maintenance of AF. Available data imply that colchicine may have a preventive role in POAF and/or postablation AF. However, certain limitations of these studies underline the need for further investigation. 相似文献22.
Optimizing glycemic control remains a shared challenge for clinicians and their patients with diabetes. Flash continuous glucose monitoring (CGM) provides immediate information about an individual’s current and projected glucose level, allowing users to respond promptly to mitigate or prevent pending hypoglycemia or hyperglycemia. Large randomized controlled trials (RCTs) have demonstrated the glycemic benefits of flash CGM use in both type 1 and type 2 diabetes. However, whereas RCTs are mostly focused on the efficacy of this technology in defined circumstances, real-world studies can assess its effectiveness in wider clinical settings. This review assesses the most recent real-world studies demonstrating the effectiveness of flash CGM use to improve clinical outcomes and health care resource utilization in populations with diabetes.During the past 5 years, increasing numbers of people with type 1 or type 2 diabetes have integrated continuous glucose monitoring (CGM) into their diabetes self-management regimens. Unlike traditional blood glucose meters, CGM systems provide immediate information about the concentration and the direction and rate of change of interstitial glucose. This information enables patients to intervene promptly to prevent or reduce acute hypoglycemia or hyperglycemia.Flash CGM is among the most recent CGM technologies. Currently, the FreeStyle Libre 14-day system (Abbott Diabetes Care) and FreeStyle Libre 2 are the only flash CGM systems available, and these systems are being adopted rapidly. Large randomized controlled trials (RCTs) have confirmed the glycemic benefits of flash CGM use in people with type 1 diabetes (1,2) and those with type 2 diabetes (3–6). However, because RCTs are mostly focused on measures of efficacy in defined circumstances, real-world studies can usefully assess the effectiveness of flash CGM in wider clinical settings.Although adoption of flash CGM continues to expand within endocrinology and diabetes specialty practices, primary care providers may be less familiar with this technology and how it can benefit patients with diabetes. This review assesses recent real-world studies demonstrating the impact of flash CGM use on clinical outcomes and health care resource utilization in both type 1 and type 2 diabetes populations. 相似文献
23.
Rebecca Robillard Karianne Dion Marie‐Helene Pennestri Elizaveta Solomonova Elliott Lee Mysa Saad Anthony Murkar Roger Godbout Jodi D. Edwards Lena Quilty Alexander R. Daros Raj Bhatla Tetyana Kendzerska 《Journal of sleep research》2021,30(1):e13231
This study aimed to evaluate changes in sleep during the COVID‐19 outbreak, and used data‐driven approaches to identify distinct profiles of changes in sleep‐related behaviours. Demographic, behavioural and psychological factors associated with sleep changes were also investigated. An online population survey assessing sleep and mental health was distributed between 3 April and 24 June 2020. Retrospective questions were used to estimate temporal changes from before to during the outbreak. In 5,525 Canadian respondents (67.1% females, 16–95 years old: Mean ± SD = 55.6 ± 16.3 years), wake‐up times were significantly delayed relative to pre‐outbreak estimates (p < .001, = 0.04). Occurrences of clinically meaningful sleep difficulties significantly increased from 36.0% before the outbreak to 50.5% during the outbreak (all p < .001, g ≥ 0.27). Three subgroups with distinct profiles of changes in sleep behaviours were identified: “Reduced Time in Bed”, “Delayed Sleep” and “Extended Time in Bed”. The “Reduced Time in Bed” and “Delayed Sleep” subgroups had more adverse sleep outcomes and psychological changes during the outbreak. The emergence of new sleep difficulties was independently associated with female sex, chronic illnesses, being employed, family responsibilities, earlier wake‐up times, higher stress levels, as well as heavier alcohol use and television exposure. The heterogeneity of sleep changes in response to the pandemic highlights the need for tailored interventions to address sleep problems. 相似文献
24.
25.
Though cerebrovascular complications of pregnancy remain relatively rare, they represent a potentially devastating event that necessitates prompt identification and treatment. Eighteen percent of strokes occurring in young women are linked to pregnancy. They occur mostly in the third trimester or during the post-partum period. Their biggest risk factors are hypertension, preeclampsia/eclampsia and migraine. Cerebrovascular events occurring during this period may involve specific pathophysiological processes that include embolic phenomena or endothelial dysfunction, but can also have common etiologies that are simply favored by the context of pregnancy. Thus, posterior encephalopathy and vasoconstriction cerebral syndrome are relatively frequently involved in cerebrovascular complications of pregnancy. Other very specific causes like amniotic fluid embolism or postpartum cardiomyopathy can also be responsible for such events. The management of stroke during pregnancy must be multidisciplinary and include a neurovascular expertise. Some conditions can lead to a long-life follow-up and modify the management of a future pregnancy. 相似文献
26.
27.
Wei-Yuan Fang Kuerbanjiang Abuduxikuer Peng Shi Yi-Ling Qiu Jing Zhao Yu-Chuan Li Xue-Yuan Zhang Neng-Li Wang Xin-Bao Xie Yi Lu A S Knisely Jian-She Wang 《World Journal of Clinical Cases》2021,9(14):3273-3286
BACKGROUNDAcute liver failure (ALF) can be a primary presentation of Wilson disease (WD). Mortality rates are high in WD with ALF (WDALF). Predictions of mortality in WDALF vary by model and are sometimes contradictory, perhaps because few patients are studied or WD diagnoses are questionable. AIMTo determine the outcomes among well-documented WDALF patients and assess mortality model performance in this cohort.METHODSWe reviewed the medical records of our pediatric WDALF patients (n = 41 over 6-years-old, single-center retrospective study) and compared seven prognostic models (King’s College Hospital Criteria, model for end-stage liver disease/pediatric end-stage liver disease scoring systems, Liver Injury Unit [LIU] using prothrombin time [PT] or international normalized ratio [INR], admission LIU using PT or INR, and Devarbhavi model) with one another.RESULTSAmong the 41 Han Chinese patients with ALF, WD was established by demonstrating ATP7B variants in 36. In 5 others, Kayser-Fleischer rings and Coombs-negative hemolytic anemia permitted diagnosis. Three died during hospitalization and three underwent liver transplantation (LT) within 1 mo of presentation and survived (7.3% each); 35 (85.4%) survived without LT when given enteral D-penicillamine and zinc-salt therapy with or without urgent plasmapheresis. Parameters significantly correlated with mortality included encephalopathy, coagulopathy, and gamma-glutamyl transpeptidase activity, bilirubin, ammonia, and serum sodium levels. Area under the receiver operating curves varied among seven prognostic models from 0.981 to 0.748 with positive predictive values from 0.214 to 0.429.CONCLUSIONWDALF children can survive and recover without LT when given D-penicillamine and Zn with or without plasmapheresis, even after enlisting for LT. 相似文献
28.
29.
T. Maishman H. Sheikh P. Boger J. Kelly K. Cozens A. Bateman S. Davies M. Fay D. Sharland A. Jackson 《Clinical oncology (Royal College of Radiologists (Great Britain))》2021,33(5):e225-e231
AimsSelf-expanding metal stents provide rapid improvement of dysphagia in oesophageal cancer but are associated with complications. The aim of the present study was to test the effectiveness of an alternative treatment of combining biodegradable stents with radiotherapy.Materials and methodsA Simon two-stage single-arm prospective phase II trial design was used to determine the efficacy of biodegradable stents plus radiotherapy in patients with dysphagia caused by oesophagus cancer who were unsuitable for radical treatment. Fourteen patients were recruited and data from 12 were included in the final analyses.ResultsFive of 12 patients met the primary end point: one stent-related patient death; four further interventions for dysphagia within 16 weeks of stenting (41.7%, 95% confidence interval 15.2–72.3%). The median time to a 10-point deterioration of quality of life was 2.7 weeks. Nine patients died within 52 weeks of registration. The median time to death from any cause was 15.0 weeks (95% confidence interval 9.6–not reached).ConclusionThe high re-intervention observed, which met the pre-defined early stopping criteria, meant that the suggested alternative treatment was not sufficiently effective to be considered for a larger scale trial design. Further work is needed to define the place of biodegradable stents in the management of malignant oesophageal strictures. 相似文献
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