首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   2926篇
  免费   177篇
  国内免费   32篇
耳鼻咽喉   6篇
儿科学   178篇
妇产科学   36篇
基础医学   326篇
口腔科学   113篇
临床医学   251篇
内科学   699篇
皮肤病学   37篇
神经病学   185篇
特种医学   488篇
外科学   393篇
综合类   29篇
预防医学   95篇
眼科学   18篇
药学   103篇
中国医学   7篇
肿瘤学   171篇
  2023年   8篇
  2022年   17篇
  2021年   36篇
  2020年   17篇
  2019年   41篇
  2018年   47篇
  2017年   34篇
  2016年   47篇
  2015年   49篇
  2014年   64篇
  2013年   114篇
  2012年   74篇
  2011年   79篇
  2010年   107篇
  2009年   89篇
  2008年   96篇
  2007年   82篇
  2006年   76篇
  2005年   80篇
  2004年   70篇
  2003年   59篇
  2002年   58篇
  2001年   58篇
  2000年   77篇
  1999年   62篇
  1998年   156篇
  1997年   125篇
  1996年   134篇
  1995年   103篇
  1994年   88篇
  1993年   96篇
  1992年   64篇
  1991年   63篇
  1990年   39篇
  1989年   80篇
  1988年   70篇
  1987年   73篇
  1986年   75篇
  1985年   69篇
  1984年   38篇
  1983年   49篇
  1982年   38篇
  1981年   26篇
  1980年   41篇
  1979年   27篇
  1978年   18篇
  1977年   24篇
  1976年   26篇
  1975年   26篇
  1966年   6篇
排序方式: 共有3135条查询结果,搜索用时 0 毫秒
71.

Introduction

The high mortality and morbidity associated with resection for oesophagogastric malignancy has resulted in a conservative approach to the postoperative management of this patient group. In August 2009 we introduced an enhanced recovery after surgery (ERAS) pathway tailored to patients undergoing resection for oesophagogastric malignancy. We aimed to assess the impact of this change in practice on standard clinical outcomes.

Methods

Two cohorts were studied of patients undergoing resection for oesophagogastric malignancy before (August 2008 – July 2009) and after (August 2009 – July 2010) the implementation of the ERAS pathway. Data were collected on demographics, interventions, length of stay, morbidity and in-hospital mortality.

Results

There were 53 and 55 oesophagogastric resections undertaken respectively for malignant disease in each of the study periods. The median length of stay for both gastric and oesophageal resection decreased from 15 to 11 days (Mann– Whitney U, p<0.001) following implementation of the ERAS pathway. There was no significant increase in morbidity (gastric resection 23.1% vs 5.3% and oesophageal resection 25.9% vs 16.7%) or mortality (gastric resection no deaths and oesophageal resection 1.8% vs 3.6%) associated with the changes. There was a significant decrease in the number of oral contrast studies used following oesophageal resection, with a reduction from 21 (77.8%) in 2008–2009 to 6 (16.7%) in 2009–2010 (chi-squared test, p<0.0001).

Conclusions

The introduction of an enhanced recovery programme following oesophagogastric surgery resulted in a significant decrease in length of median patient stay in hospital without a significant increase in associated morbidity and mortality.  相似文献   
72.

Introduction

Hepatic artery stenosis (HAS) is an important complication after liver transplantation. However, studies are not conclusive in terms of definition, incidence, best treatment, and timing of intervention. The aim of this study was to evaluate the incidence of SSHA that occurred in a single center over the past 12 years, pointing out diagnostic and therapeutic strategies.

Methods

The incidence of HAS was reviewed in 258 liver transplant recipients between January 1999 and December 2011. All patients underwent Doppler ultrasound (DUS) at fixed times. Multidetector computed tomographic angiography (MDCTA) was performed to confirm the DUS findings.

Results

HAS occurred in 23 cases (9.3%). In all cases diagnosis was performed by DUS resulting in a sensitivity of 100% and a specificity of 99.6%. Based on DUS and MDCTA data integration, in 10 cases we adopted the “wait and see” strategy, whereas 13 patients underwent interventional radiology techniques.

Conclusion

DUS monitoring is efficacious in the diagnosis of HAS after liver transplantation. Interventional radiology procedures are safe and efficacious.  相似文献   
73.
74.
75.
76.
Neurological Sciences - Episodic long-term memory (LTM) difficulties/deficits are frequent in COVID-19-recovered patients and negatively impact on prognosis and outcome. However, little is known...  相似文献   
77.
78.
The COVID‐19 pandemic has rapidly evolved and changed our way of life in an unprecedented manner. The emergence of COVID‐19 has impacted transplantation worldwide. The impact has not been just restricted to issues pertaining to donors or recipients, but also health‐care resource utilization as the intensity of cases in certain jurisdictions exceeds available capacity. Here we provide a personal viewpoint representing different jurisdictions from around the world in order to outline the impact of the current COVID‐19 pandemic on organ transplantation. Based on our collective experience, we discuss mitigation strategies such as donor screening, resource planning, and a staged approach to transplant volume considerations as local resource issues demand. We also discuss issues related to transplant‐related research during the pandemic, the role of transplant infectious diseases, and the influence of transplant societies for education and disseminating current information.  相似文献   
79.
The 759 cases of brain death declaration (BDD [Italian law, 6 hours of observation time]) that occurred in 190 Italian intensive care units (ICUs) between May and September 2012 were studied to quantify carbapenem‐resistant gram‐negative bacteria (CR‐GN) isolated in organ donors, to evaluate adherence to national screening guidelines, and to identify risk factors for CR‐GN isolation. Mandatory blood, bronchoalveolar lavage, and urine cultures were performed on the BDD day in 99% of used donors. Because results were rarely made available before transplant, >20% of transplants were performed before obtaining any microbiological information, and organs from 15 of 22 CR‐GN cases were used. Two (lung–liver) of the 37 recipients died, likely because of donor‐derived early CR‐GN sepsis. ICU stay >3 days (odds ratio [OR] = 7.49, P = .004), fever (OR = 3.11, P = .04), age <60 years (OR = 2.80, P = .06), and positive ICU epidemiology (OR = 8.77, P = .07) were associated with CR‐GN isolation. An association between single ICU and risk of CR‐GN was observed, as a result of differences across ICUs (ICC = 29%; 95% confidence interval [CI] 6.5%‐72%) probably related to inadequate practices of infection control. Continuous education aimed at implementing priority actions, including stewardship programs for a rational use of antimicrobials, is a priority in healthcare systems and transplant networks. Improved awareness among ICU personnel regarding the importance of early CR‐GN detection and timely alert systems might facilitate decisions regarding organ suitability and eventually save recipient lives.  相似文献   
80.
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号