全文获取类型
收费全文 | 16534篇 |
免费 | 1012篇 |
国内免费 | 282篇 |
专业分类
耳鼻咽喉 | 136篇 |
儿科学 | 715篇 |
妇产科学 | 137篇 |
基础医学 | 1189篇 |
口腔科学 | 489篇 |
临床医学 | 3470篇 |
内科学 | 3168篇 |
皮肤病学 | 130篇 |
神经病学 | 394篇 |
特种医学 | 492篇 |
外国民族医学 | 3篇 |
外科学 | 2383篇 |
综合类 | 2760篇 |
预防医学 | 880篇 |
眼科学 | 60篇 |
药学 | 1104篇 |
12篇 | |
中国医学 | 196篇 |
肿瘤学 | 110篇 |
出版年
2024年 | 10篇 |
2023年 | 279篇 |
2022年 | 390篇 |
2021年 | 950篇 |
2020年 | 794篇 |
2019年 | 563篇 |
2018年 | 548篇 |
2017年 | 596篇 |
2016年 | 592篇 |
2015年 | 590篇 |
2014年 | 1139篇 |
2013年 | 1136篇 |
2012年 | 964篇 |
2011年 | 1053篇 |
2010年 | 903篇 |
2009年 | 819篇 |
2008年 | 770篇 |
2007年 | 800篇 |
2006年 | 681篇 |
2005年 | 631篇 |
2004年 | 488篇 |
2003年 | 397篇 |
2002年 | 308篇 |
2001年 | 264篇 |
2000年 | 213篇 |
1999年 | 210篇 |
1998年 | 154篇 |
1997年 | 146篇 |
1996年 | 146篇 |
1995年 | 150篇 |
1994年 | 126篇 |
1993年 | 94篇 |
1992年 | 114篇 |
1991年 | 88篇 |
1990年 | 93篇 |
1989年 | 88篇 |
1988年 | 54篇 |
1987年 | 71篇 |
1986年 | 55篇 |
1985年 | 63篇 |
1984年 | 59篇 |
1983年 | 37篇 |
1982年 | 45篇 |
1981年 | 26篇 |
1980年 | 41篇 |
1979年 | 27篇 |
1978年 | 16篇 |
1977年 | 14篇 |
1976年 | 11篇 |
1971年 | 5篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
《The Journal of thoracic and cardiovascular surgery》2023,165(1):301-326
ObjectiveThe use of mechanical circulatory support (MCS) in lung transplantation has been steadily increasing over the prior decade, with evolving strategies for incorporating support in the preoperative, intraoperative, and postoperative settings. There is significant practice variability in the use of these techniques, however, and relatively limited data to help establish institutional protocols. The objective of the AATS Clinical Practice Standards Committee (CPSC) expert panel was to review the existing literature and establish recommendations about the use of MCS before, during, and after lung transplantation.MethodsThe AATS CPSC assembled an expert panel of 16 lung transplantation physicians who developed a consensus document of recommendations. The panel was broken into subgroups focused on preoperative, intraoperative, and postoperative support, and each subgroup performed a focused literature review. These subgroups formulated recommendation statements for each subtopic, which were evaluated by the entire group. The statements were then developed via discussion among the panel and refined until consensus was achieved on each statement.ResultsThe expert panel achieved consensus on 36 recommendations for how and when to use MCS in lung transplantation. These recommendations included the use of veno-venous extracorporeal membrane oxygenation (ECMO) as a bridging strategy in the preoperative setting, a preference for central veno-arterial ECMO over traditional cardiopulmonary bypass during the transplantation procedure, and the benefit of supporting selected patients with MCS postoperatively.ConclusionsAchieving optimal results in lung transplantation requires the use of a wide range of strategies. MCS provides an important mechanism for helping these critically ill patients through the peritransplantation period. Despite the complex nature of the decision making process in the treatment of these patients, the expert panel was able to achieve consensus on 36 recommendations. These recommendations should provide guidance for professionals involved in the care of end-stage lung disease patients considered for transplantation. 相似文献
2.
3.
《Journal of vascular and interventional radiology : JVIR》2022,33(5):572-577.e1
The technical feasibility of the rocket technique was evaluated for patients treated for stroke where the direct aspiration first-pass technique (ADAPT) failed to reach the occlusion site. This single-center retrospective study included data on consecutive patients with a large vessel occlusion of the anterior circulation who underwent mechanical thrombectomy. Of 138 patients, 100 met the inclusion criteria. In 84 patients, a large 0.072-inch inner lumen aspiration catheter was able to reach the occlusion site when deployed with a coaxial microcatheter. In 16 patients, this technique failed, and the microcatheter was replaced with a compliant balloon inflated at the extremity of the aspiration catheter (rocket technique). In 15 of these 16 patients, the rocket technique brought the catheter into contact with the thrombus. In conclusion, when deployment of the ADAPT with a coaxial microcatheter fails to reach the clot site, the rocket technique can safely advance the aspiration catheter to the clot. 相似文献
4.
《Advances in medical sciences》2021,66(2):388-395
Electrical impedance tomography (EIT) is a non-invasive, radiation-free method of diagnostics imaging, allowing for a bedside, real-time dynamic assessment of lung function. It stands as an alternative for other imagining methods, such as computed tomography (CT) or ultrasound. Even though the technique is rather novel, it has a wide variety of possible applications. In the era of modern mechanical ventilation, a dynamic assessment of patient's respiratory condition appears to fulfil the idea of personalized treatment. Additionally, an increasing frequency of respiratory failure among intensive care populations raises demand for improved monitoring tools. This review aims to raise awareness and presents possible implications for the use of EIT in the intensive care setting. 相似文献
5.
Aldo Cannata Silvia Cantoni Antonio Sciortino Giuseppe Bruschi Claudio Francesco Russo 《Journal of the American College of Cardiology》2021,77(18):2323-2334
Mechanical intravascular hemolysis is frequently observed following procedures on heart valves and uncommonly observed in native valvular disease. In most cases, its severity is mild. Nevertheless, it can be clinically significant and even life threatening, requiring multiple blood transfusions and renal replacement therapy. This paper reviews the current knowledge on mechanical intravascular hemolysis in valvular disease, before and after correction, focusing on pathophysiology, approach to diagnosis, and impact of other hematological conditions on the resultant anemia. The importance of a multidisciplinary management is underscored. Laboratory data are provided about subclinical hemolysis that is commonly observed following the implantation of surgical and transcatheter valve prostheses and devices. Finally, clinical scenarios are reviewed and current medical and surgical treatments are discussed, including alternative options for inoperable patients. 相似文献
6.
7.
8.
Ivan A. Pelevin Anton Yu. Nalivaiko Dmitriy Yu. Ozherelkov Alexander S. Shinkaryov Stanislav V. Chernyshikhin Alexey N. Arnautov Sergey V. Zmanovsky Alexander A. Gromov 《Materials》2021,14(10)
Aluminum matrix composites (AMC) are of great interest and importance as high-performance materials with enhanced mechanical properties. Al2O3 is a commonly used reinforcement in AMCs fabricated by means of various technological methods, including casting and sintering. Selective laser melting (SLM) is a suitable modern method of the fabrication of net-shape fully dense parts from AMC with alumina. The main results, achievements, and difficulties of SLM applied to AMCs with alumina are discussed in this review and compared with conventional methods. It was shown that the initial powder preparation, namely the particle size distribution, sphericity, and thorough mixing, affected the final microstructure and properties of SLMed materials drastically. The distribution of reinforcing particles tends to consolidate the near-melting pool-edges process because of pushing by the liquid–solid interface during the solidification process that is a common problem of various fabrication methods. The achievement of an homogeneous distribution was shown to be possible through both the thorough mixing of the initial powders and the precise optimization of SLM parameters. The strength of the AMCs fabricated by the SLM method was relatively low compared with materials produced by conventional methods, while for superior relative densities of more than 99%, hardness and tribological properties were obtained, making SLM a promising method for the Al-based matrix composites with Al2O3. 相似文献
9.
《Cirugía espa?ola》2022,100(4):230-234
IntroductionEsophageal cancer represents the eighth neoplasm worldwide. The therapeutic approach is interdisciplinary, with surgery being the most effective option. Several techniques have been proposed to perform esophagogastrostomy after esophagectomy, among them mechanical triangular esophagogastrostomy, with a little experience published in the Western literature on the latter. The objective of this study is to describe the technical aspects and initial results of triangular esophagogastrostomy anastomosis.MethodsA retrospective review of the patients who underwent esophagectomy according to the McKeown technique was performed, those in which triangular esophagogastrostomy anastomosis was implemented, between October 2017 and March 2020 in our hospital.ResultsA total of 14 patients were included, with a mean age of 63 years. The mean operative time was 436 minutes (360-581), being diagnosed of anastomotic leak 3 of the 14 patients (21.4%), as well as 3 patients presented anastomotic stenosis. The median stay was 20 days, without any death in the series.ConclusionsMultiple publications suggest the superiority in terms of anastomotic leak and anastomotic stenosis of the mechanical triangular anastomosis, which was also observed in our series, in which despite the small sample, a rapid improvement was observed in the indicators after the first cases. Therefore, this type of anastomosis may be a safe option for performing esophagogastric anastomosis after esophagectomy, being necessary more definitive conclusive studies. 相似文献
10.
《Pancreatology》2022,22(5):665-670
Background and objectivesHyperlipasemia is highly prevalent among coronavirus disease 2019 (COVID-19) patients. The aim of this study was to assess the effect of lipase activity, measured at the time of admission, on the clinical course and mortality in COVID-19 patients.MethodsThe population of this study comprised 12,139 patients who were hospitalized due to COVID-19 between June 2020 and June 2021 in a pandemic hospital. Of these, 8819 patients were excluded from the study due to missing data, four patients were excluded due to a diagnosis of acute pancreatitis (according to the revised Atlanta criteria), and 72 patients were excluded due to alcohol use or having a history of chronic pancreatitis. The final study sample consisted of the remaining 3244 COVID-19 patients. Laboratory results, intensive care unit (ICU) follow-up periods, the need for mechanical ventilation, and mortality rates were compared between the normal lipase activity and high lipase activity groups.ResultsThere were 968 (29.8%) patients with high lipase activity at the time of admission. The rate of ICU admission was 36.1% vs. 9.9% (p < 0.001), mechanical ventilation requirement rates were 33.7% vs. 8.3% (p < 0.001), and mortality rates were as 24.6% vs. 6.4% (p < 0.001) in the high lipase activity group compared to the normal lipase activity group. Multivariate regression analysis revealed that high lipase activity was an independent factor in predicting mortality in hospitalized COVID-19 patients (odds ratio [OR]: 3.191, p < 0.001).ConclusionElevated lipase activity without acute pancreatitis at the time of admission in COVID-19 patients was determined as an independent predictor of poor prognosis. 相似文献