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   3544115篇
  免费   294668篇
  国内免费   14196篇
耳鼻咽喉   48102篇
儿科学   113059篇
妇产科学   92554篇
基础医学   562398篇
口腔科学   94121篇
临床医学   318362篇
内科学   631993篇
皮肤病学   93554篇
神经病学   304441篇
特种医学   138415篇
外国民族医学   491篇
外科学   543317篇
综合类   107843篇
现状与发展   24篇
一般理论   2352篇
预防医学   297745篇
眼科学   81082篇
药学   242700篇
  22篇
中国医学   10496篇
肿瘤学   169908篇
  2021年   55423篇
  2020年   35259篇
  2019年   58308篇
  2018年   71891篇
  2017年   54893篇
  2016年   60693篇
  2015年   74495篇
  2014年   108795篇
  2013年   173911篇
  2012年   100067篇
  2011年   100628篇
  2010年   118207篇
  2009年   122497篇
  2008年   87127篇
  2007年   90753篇
  2006年   101093篇
  2005年   96262篇
  2004年   97644篇
  2003年   87983篇
  2002年   77363篇
  2001年   118460篇
  2000年   111907篇
  1999年   107784篇
  1998年   66694篇
  1997年   64272篇
  1996年   62121篇
  1995年   57560篇
  1994年   51509篇
  1993年   48057篇
  1992年   74358篇
  1991年   70039篇
  1990年   65756篇
  1989年   64527篇
  1988年   59497篇
  1987年   58209篇
  1986年   54734篇
  1985年   54509篇
  1984年   49555篇
  1983年   45125篇
  1982年   42199篇
  1981年   39566篇
  1980年   37253篇
  1979年   40288篇
  1978年   35604篇
  1977年   32308篇
  1976年   29642篇
  1975年   27968篇
  1974年   29043篇
  1973年   28080篇
  1972年   26260篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Gattermann  J. 《Der Onkologe》2020,26(11):1010-1018
Die Onkologie - Die Corona-Pandemie hat in den letzten Monaten verdeutlicht, dass das Thema Sterblichkeit trotz erheblicher Fortschritte im Bereich der Hospiz- und Palliativversorgung zu...  相似文献   
92.
93.
Bulletin of Experimental Biology and Medicine - Ammonium, an end-product of catabolism, in low doses can promote adaptation of metabolic pathways in erythrocytes under conditions of extreme...  相似文献   
94.
Introduction: Triple negative breast cancer (TNBC) is an aggressive breast cancer subtype associated with an increased risk of recurrence and cancer-related death. Unlike hormone receptor-positive or HER2-positive breast cancers, there are limited targeted therapies available to treat TNBC and cytotoxic chemotherapy remains the mainstay of treatment. Sacituzumab govitecan (IMMU-132) is an antibody-drug conjugate targeting Trop-2 expressing cells and selectively delivering SN-38, an active metabolite of irinotecan.

Areas covered: This review covers the mechanism of action, safety and efficacy of sacituzumab govitecan in patients with previously treated, metastatic TNBC. Additionally, efficacy data in other epithelial malignancies is included based on a PubMed search for ‘sacituzumab govitecan’ and ‘clinical trial’.

Expert opinion: Sacituzumab govitecan has promising anti-cancer activity in patients with metastatic TNBC previously treated with at least two prior lines of systemic therapy based on a single arm Phase I/II clinical trial. A confirmatory Phase III randomized clinical trial is ongoing. Sacituzumab govitecan has a manageable side effect profile, with the most common adverse events being nausea, neutropenia, and diarrhea. The activity of sacituzumab govitecan likely extends beyond TNBC with promising early efficacy data in many other epithelial cancers, including hormone receptor-positive breast cancer.  相似文献   

95.
96.

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   
97.
98.
99.
100.
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