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   1000869篇
  免费   77072篇
  国内免费   2639篇
耳鼻咽喉   13060篇
儿科学   34536篇
妇产科学   28571篇
基础医学   146094篇
口腔科学   27762篇
临床医学   90603篇
内科学   194365篇
皮肤病学   23161篇
神经病学   79519篇
特种医学   38895篇
外国民族医学   305篇
外科学   150250篇
综合类   23755篇
一般理论   386篇
预防医学   77956篇
眼科学   22760篇
药学   72139篇
  3篇
中国医学   2033篇
肿瘤学   54427篇
  2018年   10679篇
  2017年   8355篇
  2016年   9489篇
  2015年   10742篇
  2014年   14577篇
  2013年   22236篇
  2012年   29350篇
  2011年   31230篇
  2010年   18736篇
  2009年   17658篇
  2008年   29175篇
  2007年   30826篇
  2006年   31331篇
  2005年   29987篇
  2004年   29269篇
  2003年   28147篇
  2002年   27070篇
  2001年   46977篇
  2000年   48076篇
  1999年   40326篇
  1998年   11249篇
  1997年   10153篇
  1996年   10206篇
  1995年   9813篇
  1994年   9132篇
  1993年   8501篇
  1992年   32287篇
  1991年   31483篇
  1990年   31033篇
  1989年   29899篇
  1988年   27192篇
  1987年   27347篇
  1986年   25458篇
  1985年   24625篇
  1984年   18417篇
  1983年   15545篇
  1982年   9315篇
  1981年   8391篇
  1979年   16874篇
  1978年   12234篇
  1977年   10331篇
  1976年   9765篇
  1975年   10186篇
  1974年   12326篇
  1973年   11852篇
  1972年   10894篇
  1971年   10118篇
  1970年   9380篇
  1969年   8733篇
  1968年   8110篇
排序方式: 共有10000条查询结果,搜索用时 46 毫秒
11.
Introduction: Pharmacovigilance is essential to monitoring the safety profiles of authorized medicines. Compared with small-molecule drugs, biological drugs are more complex, more susceptible to structural variability due to manufacturing processes, and have the potential to induce immune-related reactions, underscoring the importance of safety monitoring for these products. Although highly similar to reference products, biosimilars are not expected to be structurally identical. For these reasons, proper reporting of potential adverse drug reactions (ADRs) using distinguishable names and batch numbers is essential for accurate tracing of all biological drugs. To address the need for robust pharmacovigilance, the European Parliament and Council of the European Union provided legislation regarding pharmacovigilance of biologics in 2010.

Areas covered: This narrative review examines the current state of pharmacovigilance for biologics in the European Union (EU) and discusses relevant information on pharmacovigilance of biosimilars, the current EU pharmacovigilance system, and areas that could be improved.

Expert opinion: Although steps have been taken to improve pharmacovigilance of biologics in the EU, several enhancements can still be made, including additional training for healthcare professionals on ADR reporting, the use of 2D barcodes that enhance traceability, and an open discussion of potentially missed opportunities in the pharmacovigilance of biosimilars.  相似文献   

12.
13.
14.
15.
16.
17.
18.

Objective

To examine whether a healthy weight intervention embedded in the Parents as Teachers (PAT) home visiting program, which was previously found to improve mothers’ body mass index (BMI) and obesity-related behaviors, changed the BMI of preschool children or maternal feeding practices.

Methods

This stratified randomized trial included preschool-aged children at risk for overweight whose mothers were overweight or had obesity (n?=?179). The Healthy Eating and Active Living Taught at Home (HEALTH) intervention was based on the Diabetes Prevention Program. Differences were examined using repeated-measures mixed-ANOVA models.

Results

Compared with PAT usual care, the HEALTH intervention had no effect on children's BMI or maternal feeding practices. However, combined analyses showed that children's BMI percentile decreased (P??=?.007), BMI z-scores were maintained (P??=?.19), and 3 of 8 feeding practices improved over time (P < .05).

Conclusions and Implications

Additional research is needed to assess the effectiveness of PAT to prevent preschool-age obesity using rigorous designs (eg, group-randomized trials) and to identify its active components. HEALTH is ready to be scaled up to prevent maternal weight gain through embedding within the national PAT program.  相似文献   
19.
20.

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