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   1196793篇
  免费   85587篇
  国内免费   3124篇
耳鼻咽喉   15741篇
儿科学   40409篇
妇产科学   33577篇
基础医学   173610篇
口腔科学   34296篇
临床医学   103113篇
内科学   238811篇
皮肤病学   29082篇
神经病学   95571篇
特种医学   43329篇
外国民族医学   328篇
外科学   173583篇
综合类   24768篇
一般理论   422篇
预防医学   99807篇
眼科学   27383篇
药学   86689篇
  3篇
中国医学   2785篇
肿瘤学   62197篇
  2021年   10863篇
  2019年   11345篇
  2018年   16314篇
  2017年   11861篇
  2016年   13109篇
  2015年   14691篇
  2014年   19628篇
  2013年   29664篇
  2012年   41104篇
  2011年   43447篇
  2010年   25237篇
  2009年   23014篇
  2008年   39226篇
  2007年   41478篇
  2006年   41667篇
  2005年   39997篇
  2004年   38516篇
  2003年   36807篇
  2002年   35422篇
  2001年   52646篇
  2000年   54245篇
  1999年   45276篇
  1998年   12503篇
  1997年   11015篇
  1996年   10997篇
  1995年   10519篇
  1994年   9711篇
  1992年   34847篇
  1991年   33890篇
  1990年   33391篇
  1989年   31943篇
  1988年   29107篇
  1987年   29110篇
  1986年   27277篇
  1985年   26307篇
  1984年   19629篇
  1983年   16593篇
  1982年   9909篇
  1979年   18212篇
  1978年   13107篇
  1977年   11160篇
  1976年   10550篇
  1975年   11157篇
  1974年   13567篇
  1973年   13127篇
  1972年   12089篇
  1971年   11272篇
  1970年   10472篇
  1969年   9886篇
  1968年   9248篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
31.
32.

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   
33.
34.
35.
We report two British cases of liver abscess, due to Klebsiella pneumoniae and associated with synchronous infection elsewhere, which required liver resection for definitive treatment. They illustrate the geographic spread of aggressive K pneumoniae liver infection and demonstrate the importance of early aggressive treatment.  相似文献   
36.
Henna, derived from a combination of natural leaves and coloring additives, is a common decorative dye traditionally used in many Islamic religious celebrations. Para‐phenylenediamine (PPD), a major component of black henna tattoo, is a strong sensitizer and common allergen. We report a case of severe connubial allergic contact dermatitis after black henna heterotransfer in a girl.  相似文献   
37.
Acne vulgaris (acne) is a chronic inflammatory disease of the sebaceous gland, characterized by follicular hyperkeratinization, excessive colonization by Propionibacterium acnes (Pacnes) as well as immune reactions and inflammation. Despite an armamentarium of topical treatments available including benzoyl peroxide, retinoids and azelaic acid, topical antibiotics in monotherapies, especially erythromycin and clindamycin, are still used in Europe to treat acne. This intensive use led to antimicrobial‐resistant P. acnes and staphylococci strains becoming one of the main health issues worldwide. This is an update on the current topical acne treatments available in Europe, their mechanism of action, their potential to induce antimicrobial resistance and their clinical efficacy and safety.  相似文献   
38.
We report on a child with several café au lait spots in association with a lumbar lipomeningomyelocele as an apparently new association. Cutaneous markers, the identification of which plays a crucial role in the early diagnosis and management of spinal malformations, can accompany occult spinal dysraphism. Herein we report a case of lumbar lipomeningomyelocele associated with an overlying café au lait spot that served as a marker of occult spinal dysraphism. The patient also had segmental café au lait spots on the face, making the association unique.  相似文献   
39.
40.
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