全文获取类型
收费全文 | 1821754篇 |
免费 | 131235篇 |
国内免费 | 4076篇 |
专业分类
耳鼻咽喉 | 23613篇 |
儿科学 | 59090篇 |
妇产科学 | 49182篇 |
基础医学 | 259923篇 |
口腔科学 | 53150篇 |
临床医学 | 158735篇 |
内科学 | 361507篇 |
皮肤病学 | 41916篇 |
神经病学 | 141732篇 |
特种医学 | 67047篇 |
外国民族医学 | 243篇 |
外科学 | 271447篇 |
综合类 | 39560篇 |
现状与发展 | 4篇 |
一般理论 | 559篇 |
预防医学 | 140503篇 |
眼科学 | 43727篇 |
药学 | 133867篇 |
7篇 | |
中国医学 | 4958篇 |
肿瘤学 | 106295篇 |
出版年
2021年 | 14697篇 |
2019年 | 15709篇 |
2018年 | 23717篇 |
2017年 | 17619篇 |
2016年 | 19059篇 |
2015年 | 21645篇 |
2014年 | 29174篇 |
2013年 | 42533篇 |
2012年 | 60725篇 |
2011年 | 63928篇 |
2010年 | 36901篇 |
2009年 | 33678篇 |
2008年 | 58353篇 |
2007年 | 62113篇 |
2006年 | 62314篇 |
2005年 | 59227篇 |
2004年 | 56959篇 |
2003年 | 53952篇 |
2002年 | 51933篇 |
2001年 | 95130篇 |
2000年 | 97423篇 |
1999年 | 79847篇 |
1998年 | 20259篇 |
1997年 | 17606篇 |
1996年 | 17722篇 |
1995年 | 17042篇 |
1994年 | 15550篇 |
1993年 | 14280篇 |
1992年 | 59089篇 |
1991年 | 56805篇 |
1990年 | 54505篇 |
1989年 | 52088篇 |
1988年 | 47424篇 |
1987年 | 46162篇 |
1986年 | 43493篇 |
1985年 | 41188篇 |
1984年 | 30183篇 |
1983年 | 25651篇 |
1982年 | 14292篇 |
1979年 | 26563篇 |
1978年 | 18254篇 |
1977年 | 15568篇 |
1976年 | 14490篇 |
1975年 | 15312篇 |
1974年 | 18606篇 |
1973年 | 17933篇 |
1972年 | 16637篇 |
1971年 | 15400篇 |
1970年 | 14312篇 |
1969年 | 13454篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
51.
Jose M. Morales Jose Angel Martinez-Flores Manuel Serrano Maria José Castro Francisco Javier Alfaro Florencio García Miguel Angel Martínez Amado Andrés Esther González Manuel Praga Estela Paz-Artal Antonio Serrano 《Journal of the American Society of Nephrology : JASN》2015,26(3):735-745
In the current immunosuppressive therapy era, vessel thrombosis is the most common cause of early graft loss after renal transplantation. The prevalence of IgA anti–β2-glycoprotein I antibodies (IgA-aB2GPI-ab) in patients on dialysis is elevated (>30%), and these antibodies correlate with mortality and cardiovascular morbidity. To evaluate the effect of IgA-aB2GPI-ab in patients with transplants, we followed all patients transplanted from 2000 to 2002 in the Hospital 12 de Octubre prospectively for 10 years. Presence of IgA-aB2GPI-ab in pretransplant serum was examined retrospectively. Of 269 patients, 89 patients were positive for IgA-aB2GPI-ab (33%; group 1), and the remaining patients were negative (67%; group 2). Graft loss at 6 months post-transplant was significantly higher in group 1 (10 of 89 versus 3 of 180 patients in group 2; P=0.002). The most frequent cause of graft loss was thrombosis of the vessels, which was observed only in group 1 (8 of 10 versus 0 of 3 patients in group 2; P=0.04). Multivariate analysis showed that the presence of IgA-aB2GPI-ab was an independent risk factor for early graft loss (P=0.04) and delayed graft function (P=0.04). There were no significant differences regarding patient survival between the two groups. Graft survival was similar in both groups after 6 months. In conclusion, patients with pretransplant IgA-aB2GPI-ab have a high risk of early graft loss caused by thrombosis and a high risk of delayed graft function. Therefore, pretransplant IgA-aB2GPI-ab may have a detrimental effect on early clinical outcomes after renal transplantation. 相似文献
52.
Improvement in Tricuspid Annular Plane Systolic Excursion with Pulmonary Hypertension Therapy in Pediatric Patients
下载免费PDF全文
![点击此处可从《Echocardiography (Mount Kisco, N.Y.)》网站下载免费的PDF全文](/ch/ext_images/free.gif)
53.
54.
55.
56.
57.
58.
Ruiz-Úcar Elena Acín-Gándara Débora Medina-García Manuel Ronda Diego Cruzado Pereira-Pérez Fernando 《Obesity surgery》2022,32(2):569-570
Obesity Surgery - Laparoscopic sleeve gastrectomy (LSG) is increasingly playing a key role in obesity management. Such operations, however, carry complications sometimes including leaks. The... 相似文献
59.
C.Z. Simonsen S. Schnenberger P.L. Hendn A.J. Yoo L. Uhlmann A. Rentzos J. Bsel J. Valentin M. Rasmussen 《AJNR. American journal of neuroradiology》2020,41(12):2298
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.