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   1698832篇
  免费   126658篇
  国内免费   3784篇
耳鼻咽喉   21960篇
儿科学   55826篇
妇产科学   46375篇
基础医学   242169篇
口腔科学   48873篇
临床医学   151740篇
内科学   334661篇
皮肤病学   38827篇
神经病学   131612篇
特种医学   64227篇
外国民族医学   247篇
外科学   258143篇
综合类   38985篇
现状与发展   4篇
一般理论   532篇
预防医学   124719篇
眼科学   40276篇
药学   124070篇
  7篇
中国医学   4479篇
肿瘤学   101542篇
  2021年   12858篇
  2019年   13592篇
  2018年   20035篇
  2017年   15268篇
  2016年   16698篇
  2015年   19047篇
  2014年   26322篇
  2013年   38092篇
  2012年   52975篇
  2011年   55656篇
  2010年   32939篇
  2009年   30865篇
  2008年   51780篇
  2007年   55047篇
  2006年   55529篇
  2005年   52821篇
  2004年   50989篇
  2003年   48369篇
  2002年   46574篇
  2001年   91979篇
  2000年   93827篇
  1999年   77163篇
  1998年   19804篇
  1997年   17330篇
  1996年   17446篇
  1995年   16789篇
  1994年   15326篇
  1993年   14099篇
  1992年   57487篇
  1991年   55372篇
  1990年   53092篇
  1989年   50875篇
  1988年   46212篇
  1987年   45047篇
  1986年   42321篇
  1985年   40083篇
  1984年   29423篇
  1983年   24952篇
  1982年   13940篇
  1979年   25604篇
  1978年   17623篇
  1977年   14975篇
  1976年   13925篇
  1975年   14636篇
  1974年   17706篇
  1973年   17015篇
  1972年   15742篇
  1971年   14511篇
  1970年   13480篇
  1969年   12582篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
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   
42.
43.
44.
45.
46.
47.
48.
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   
49.
50.
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