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   1054940篇
  免费   76382篇
  国内免费   1928篇
耳鼻咽喉   14478篇
儿科学   27530篇
妇产科学   25573篇
基础医学   148864篇
口腔科学   30990篇
临床医学   92907篇
内科学   208363篇
皮肤病学   20833篇
神经病学   83062篇
特种医学   41699篇
外国民族医学   79篇
外科学   172025篇
综合类   19829篇
现状与发展   2篇
一般理论   400篇
预防医学   73433篇
眼科学   23890篇
药学   81323篇
  5篇
中国医学   2312篇
肿瘤学   65653篇
  2021年   7902篇
  2019年   8135篇
  2018年   11624篇
  2017年   8938篇
  2016年   9792篇
  2015年   11348篇
  2014年   15632篇
  2013年   23027篇
  2012年   32116篇
  2011年   33611篇
  2010年   19579篇
  2009年   18653篇
  2008年   32221篇
  2007年   33909篇
  2006年   34332篇
  2005年   33393篇
  2004年   32284篇
  2003年   30802篇
  2002年   30239篇
  2001年   55917篇
  2000年   57506篇
  1999年   48242篇
  1998年   12241篇
  1997年   10680篇
  1996年   10756篇
  1995年   10061篇
  1994年   9235篇
  1993年   8521篇
  1992年   36264篇
  1991年   34702篇
  1990年   33446篇
  1989年   32566篇
  1988年   29705篇
  1987年   28926篇
  1986年   26984篇
  1985年   25923篇
  1984年   18682篇
  1983年   15944篇
  1982年   8846篇
  1979年   16349篇
  1978年   11198篇
  1977年   9610篇
  1976年   8347篇
  1975年   9057篇
  1974年   10889篇
  1973年   10271篇
  1972年   9629篇
  1971年   9139篇
  1970年   8670篇
  1969年   8110篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Quality of Life Research - The COVID-19 pandemic might add to the stressors experienced by people living with rheumatic diseases. This study aimed to examine rheumatic patients’ functional...  相似文献   
2.
Isolated patellofemoral arthritis is an increasingly recognized entity, and is usually associated with previous patellofemoral dysplasia or instability. Patellofemoral arthroplasty (PFA) has evolved significantly in recent years, both in terms of implant design and importantly in the understanding of appropriate patient selection. This review outlines the indications and investigations for PFA, provides a brief history of the development of contemporary implants, and presents the clinical outcomes for the prostheses most commonly used in the UK. In addition, it provides a detailed surgical technique for implantation of an onlay implant, with tips on how to optimize patellofemoral biomechanics and thus achieve a consistently good outcome.  相似文献   
3.
4.
5.
6.
Introduction: Percutaneous renal mass biopsy has evolved over the last decade with improvements on previous pitfalls including low tissue yield, high non-diagnostic rates, and complications. As understanding of tumor biology and natural history of renal cortical neoplasms has improved, percutaneous renal mass biopsy is poised to have an expanding role in an area characterized by individualized management and refined risk stratification.

Areas covered: This review summarizes the evolution of renal mass biopsy to its current state with respect to outcomes, indications, and clinical guidelines.

Expert opinion: With improved understanding of differential biological potential of renal cortical neoplasms combined with technical improvements in diagnostic yield and accuracy, utilization of renal mass biopsy is becoming an important adjunct to patient care in a broad range of clinical scenarios, including active surveillance, thermal ablation, and use of primary systemic therapy in localized and advanced settings.  相似文献   

7.
8.
9.
Pharmaceutical Chemistry Journal - An HPLC-MS method for simultaneous quantitative determination of a novel gestagenic pharmaceutical and two of its metabolites in rat and rabbit blood sera was...  相似文献   
10.

Objectives

Expedient extubation after cardiac surgery has been associated with improved outcomes, leading to postoperative extubation frequently during overnight hours. However, recent evidence in a mixed medical-surgical intensive care unit population demonstrated worse outcomes with overnight extubation. This study investigated the impact of overnight extubation in a statewide, multicenter Society of Thoracic Surgeons database.

Methods

Records from 39,812 patients undergoing coronary artery bypass grafting or valve operations (2008-2016) and extubated within 24 hours were stratified according to extubation time between 06:00 and 18:00 (day) or between 18:00 and 6:00 (overnight). Outcomes including reintubation, mortality, and composite morbidity-mortality were evaluated using hierarchical regression models adjusted for Society of Thoracic Surgeons predictive risk scores. To further analyze extubation during the night, a subanalysis stratified patients into 3 groups: 06:00 to 18:00, 18:00 to 24:00, and 24:00 to 06:00.

Results

A total of 20,758 patients were extubated overnight (52.1%) and were slightly older (median age 66 vs 65 years, P < .001) with a longer duration of ventilation (4 vs 7 hours, P < .001). Day and overnight extubation were associated with equivalent operative mortality (1.7% vs 1.7%, P = .880), reintubation (3.7% vs 3.4%, P = .141), and composite morbidity-mortality (8.2% vs 8.0%, P = .314). After risk adjustment, overnight extubation was not associated with any difference in reintubation, mortality, or composite morbidity-mortality. On subanalysis, those extubated between 24:00 and 06:00 exhibited increased composite morbidity-mortality (odds ratio, 1.18; P = .001) but no difference in reintubation or mortality.

Conclusions

Extubation overnight was not associated with increased mortality or reintubation. These results suggest that in the appropriate clinical setting, it is safe to routinely extubate cardiac surgery patients overnight.  相似文献   
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