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   1752295篇
  免费   132870篇
  国内免费   8455篇
耳鼻咽喉   22199篇
儿科学   56216篇
妇产科学   46698篇
基础医学   248055篇
口腔科学   49885篇
临床医学   159563篇
内科学   342779篇
皮肤病学   39213篇
神经病学   134468篇
特种医学   65958篇
外国民族医学   294篇
外科学   263269篇
综合类   49858篇
现状与发展   23篇
一般理论   535篇
预防医学   128368篇
眼科学   42012篇
药学   130170篇
  46篇
中国医学   7876篇
肿瘤学   106135篇
  2021年   16118篇
  2019年   15698篇
  2018年   22132篇
  2017年   17224篇
  2016年   18520篇
  2015年   21827篇
  2014年   29790篇
  2013年   40972篇
  2012年   57427篇
  2011年   60539篇
  2010年   35799篇
  2009年   33022篇
  2008年   54722篇
  2007年   57855篇
  2006年   58283篇
  2005年   55534篇
  2004年   52667篇
  2003年   50038篇
  2002年   47916篇
  2001年   92927篇
  2000年   94765篇
  1999年   78387篇
  1998年   20666篇
  1997年   18198篇
  1996年   18062篇
  1995年   17345篇
  1994年   15896篇
  1993年   14446篇
  1992年   57834篇
  1991年   55621篇
  1990年   53297篇
  1989年   51012篇
  1988年   46393篇
  1987年   45140篇
  1986年   42391篇
  1985年   40138篇
  1984年   29418篇
  1983年   24953篇
  1982年   13927篇
  1979年   25555篇
  1978年   17582篇
  1977年   14911篇
  1976年   13879篇
  1975年   14569篇
  1974年   17635篇
  1973年   16949篇
  1972年   15676篇
  1971年   14459篇
  1970年   13434篇
  1969年   12522篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
51.
Sinus venosus atrial septal defect (SV‐ASD) usually coexists with partial anomalous pulmonary vein connection (PAPVC). It is a difficult diagnosis in transthoracic echocardiography (TTE) due to eccentric position of defects. We present a rare case of atypical anatomical variation in PAPVC, which was never described before. Two right pulmonary veins drained into superior vena cava, which overrode SV‐ASD and interatrial septum, a third pulmonary vein into the right atrium. Complete diagnosis could not be set after TTE, nor transesophageal echocardiography, whereas angio‐CT was finally conclusive. This diagnostic approach allowed the surgical planning.  相似文献   
52.
53.
54.
55.
56.
57.
58.
59.
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   
60.
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