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   2030678篇
  免费   145086篇
  国内免费   4190篇
耳鼻咽喉   27108篇
儿科学   67640篇
妇产科学   56098篇
基础医学   291737篇
口腔科学   59021篇
临床医学   179693篇
内科学   394772篇
皮肤病学   47029篇
神经病学   159507篇
特种医学   77365篇
外国民族医学   281篇
外科学   308639篇
综合类   45391篇
现状与发展   5篇
一般理论   698篇
预防医学   146875篇
眼科学   48303篇
药学   147480篇
  7篇
中国医学   5175篇
肿瘤学   117130篇
  2021年   15587篇
  2019年   16447篇
  2018年   24896篇
  2017年   19135篇
  2016年   21502篇
  2015年   23763篇
  2014年   32109篇
  2013年   47845篇
  2012年   65100篇
  2011年   68851篇
  2010年   41123篇
  2009年   37589篇
  2008年   64477篇
  2007年   68750篇
  2006年   68941篇
  2005年   65933篇
  2004年   63387篇
  2003年   60586篇
  2002年   58290篇
  2001年   103968篇
  2000年   106812篇
  1999年   87352篇
  1998年   23270篇
  1997年   20396篇
  1996年   20118篇
  1995年   19289篇
  1994年   17711篇
  1993年   16327篇
  1992年   64212篇
  1991年   62106篇
  1990年   59793篇
  1989年   57475篇
  1988年   52160篇
  1987年   50898篇
  1986年   47957篇
  1985年   45678篇
  1984年   33688篇
  1983年   28664篇
  1982年   16420篇
  1979年   29608篇
  1978年   20625篇
  1977年   17662篇
  1976年   16312篇
  1975年   17379篇
  1974年   20839篇
  1973年   20116篇
  1972年   18646篇
  1971年   17267篇
  1970年   16148篇
  1969年   14955篇
排序方式: 共有10000条查询结果,搜索用时 312 毫秒
71.
72.
73.
Lasers in Medical Science - Studies reported the harmful effects of 2,4-D on body tissues, provoking changes in the anatomy and physiology of the kidneys, liver, and testicles. Thus, the objective...  相似文献   
74.
BACKGROUND AND PURPOSE:Endovascular therapy for acute ischemic stroke is often performed with the patient under conscious sedation. Emergent conversion from conscious sedation to general anesthesia is sometimes necessary. The aim of this study was to assess the functional outcome in converted patients compared with patients who remained in conscious sedation and to identify predictors associated with the risk of conversion.MATERIALS AND METHODS:Data from 368 patients, included in 3 trials randomizing between conscious sedation and general anesthesia before endovascular therapy (SIESTA, ANSTROKE, and GOLIATH) constituted the study cohort. Twenty-one (11%) of 185 patients randomized to conscious sedation were emergently converted to general anesthesia.RESULTS:Absence of hyperlipidemia seemed to be the strongest predictor of conversion to general anesthesia, albeit a weak predictor (area under curve = 0.62). Sex, hypertension, diabetes, smoking status, atrial fibrillation, blood pressure, size of the infarct, and level and side of the occlusion were not significantly associated with conversion to general anesthesia. Neither age (mean age, 71.3   ± 13.8 years for conscious sedation versus 71.6  ± 12.3 years for converters, P = .58) nor severity of stroke (mean NIHSS score, 17 ± 4 versus 18 ± 4, respectively, P = .27) were significantly different between converters and those who tolerated conscious sedation. The converters had significantly worse outcome with a common odds ratio of 2.67 (P = .015) for a shift toward a higher mRS score compared with the patients remaining in the conscious sedation group.CONCLUSIONS:Patients undergoing conversion had significantly worse outcome compared with patients remaining in conscious sedation. No factor was identified that predicted conversion from conscious sedation to general anesthesia.

Five studies published in 2015 proved the efficacy of endovascular therapy (EVT) for acute ischemic stroke caused by a large-vessel occlusion.1 However, numerous questions remain regarding how to best deliver this treatment, including evaluation of the optimal thrombectomy technique,2 the most effective method of patient triage,3 or whether EVT should be performed with the patient under either general anesthesia (GA) or conscious sedation (CS).Observational studies have suggested that EVT with the patient under CS is associated with better neurologic outcome and lower mortality compared with GA.4 However, 3 randomized trials reported similar outcomes between CS and GA.5-7 Proposed benefits of CS include stable hemodynamics, clinical monitoring, and a potentially shorter procedure. The disadvantages are an unprotected airway and patient movement, which sometimes may require emergent conversion to GA. Patients who need conversion might be sicker (larger strokes, more medical complications), but the conversion procedure itself may also have a potentially deleterious influence on outcome due to the emergent anesthetic induction, associated hypotension, and added time delay before reperfusion.Although most patients can be treated under the less complex CS, it is of interest to identify factors that can predict the risk of conversion and hence the requirement for GA. We undertook a detailed analysis of the patients who were converted from CS to GA in our individual patient data base from the 3 randomized trials to examine the outcome of the converted patients compared with patients who remained in CS. We also aimed to identify possible predictors associated with a need for GA with EVT.  相似文献   
75.
76.
77.
Pharmaceutical Chemistry Journal - Three extracts were produced from the above-ground part of the meadowsweet Filipendula ulmaria (L.) Maxim. using water, 40% ethanol, and 70% ethanol. Comparative...  相似文献   
78.
79.
Nevo  N.  Goldstein  A. L.  Staierman  M.  Eran  N.  Carmeli  I.  Rayman  S.  mnouskin  Y. 《Hernia》2022,26(6):1491-1499
Hernia - The minimally invasive surgical repair of combined inguinal and ventral hernias often requires shifting from one approach or plane to another. The traditional enhanced-view totally...  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