全文获取类型
收费全文 | 35579篇 |
免费 | 2417篇 |
国内免费 | 756篇 |
专业分类
耳鼻咽喉 | 660篇 |
儿科学 | 857篇 |
妇产科学 | 418篇 |
基础医学 | 1602篇 |
口腔科学 | 874篇 |
临床医学 | 2634篇 |
内科学 | 5069篇 |
皮肤病学 | 1157篇 |
神经病学 | 1621篇 |
特种医学 | 3835篇 |
外科学 | 4778篇 |
综合类 | 2681篇 |
现状与发展 | 1篇 |
预防医学 | 2035篇 |
眼科学 | 619篇 |
药学 | 4664篇 |
10篇 | |
中国医学 | 469篇 |
肿瘤学 | 4768篇 |
出版年
2024年 | 36篇 |
2023年 | 332篇 |
2022年 | 708篇 |
2021年 | 1192篇 |
2020年 | 944篇 |
2019年 | 1359篇 |
2018年 | 1460篇 |
2017年 | 1090篇 |
2016年 | 996篇 |
2015年 | 1006篇 |
2014年 | 1676篇 |
2013年 | 2316篇 |
2012年 | 1554篇 |
2011年 | 1582篇 |
2010年 | 1266篇 |
2009年 | 1361篇 |
2008年 | 1386篇 |
2007年 | 1339篇 |
2006年 | 1088篇 |
2005年 | 918篇 |
2004年 | 792篇 |
2003年 | 897篇 |
2002年 | 1648篇 |
2001年 | 1911篇 |
2000年 | 2084篇 |
1999年 | 1368篇 |
1998年 | 1352篇 |
1997年 | 1220篇 |
1996年 | 693篇 |
1995年 | 432篇 |
1994年 | 228篇 |
1993年 | 193篇 |
1992年 | 166篇 |
1991年 | 166篇 |
1990年 | 144篇 |
1989年 | 149篇 |
1988年 | 125篇 |
1987年 | 121篇 |
1986年 | 109篇 |
1985年 | 205篇 |
1984年 | 195篇 |
1983年 | 173篇 |
1982年 | 134篇 |
1981年 | 139篇 |
1980年 | 127篇 |
1979年 | 121篇 |
1978年 | 56篇 |
1977年 | 50篇 |
1976年 | 48篇 |
1975年 | 22篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
41.
42.
43.
44.
45.
《Radiography》2020,26(4):e195-e200
IntroductionAdverse events in radiology are quite rare, but they do occur. Radiation safety regulations and the law obligate organizations to report certain adverse events, harm and near misses, especially events related to patients' health and safety. The aim of this study was to describe and analyse incidents related to radiation safety issues reported in Finland.MethodsThe data were collected from incident reports documented by radiology personnel concerning notifications of abnormal events in medical imaging made to the Radiation and Nuclear Safety Authority between 2010 and 2017. During these eight years, 312 reports were submitted. Only events reported from radiology departments were included; nuclear medicine, radiotherapy and animal radiology cases were excluded. The final number of reports was 293 (94%).ResultsThe majority of the 293 approved reports were related to computed tomography (CT, 68.3%) and to X-ray examinations (27.6%). Altogether 82.9% of those irradiated were adults, most of whom were exposed to unnecessary radiation through CT (86.5%), 5.5% were children, and 4.4% pregnant women. The most common effective dose of unnecessary radiation was 1 mSv or less (89.7% of all examinations). The highest effective doses were reported in CT (from under 1 mSv–20 mSv and above). The reasons for the adverse events were incorrect identification (32%), incorrect procedure, site or side (30%); and human errors or errors of knowledge (20%).ConclusionAdverse events occurred especially in CT examinations. It is important to collect and analyse incident data, assess the harmful events, learn from them and aim to reduce adverse events.Implications for practiceThis study emphasizes the need for radiological personnel to obtain evidence-based information on adverse events and focus on training to improve patient safety. 相似文献
46.
《Surgery for obesity and related diseases》2022,18(6):762-771
BackgroundNew antidiabetic agents (sodium-glucose cotransporter-2 inhibitor [SGLT2i] and glucagon-like peptide-1 receptor agonist [GLP-1RA]) and metabolic surgery have protective effects on metabolic syndromes.ObjectivesTo compare the changes of metabolic parameters and costs among patients with obesity and type 2 diabetes undergoing metabolic surgery and initiating new antidiabetic agents over 12 months.SettingHong Kong Hospital Authority database from 2006–2017.MethodsThis is a population-wide retrospective cohort study consisting of 2616 patients (1810 SGLT2i, 528 GLP-1RA, 278 metabolic surgery). Inverse probability treatment weighting of propensity score was applied to balance baseline covariates of patients with obesity and type 2 diabetes who underwent metabolic surgery, or initiated SGLT2i or GLP-1RA. Metabolic parameters and direct medical costs were measured and compared from baseline to 12 months in metabolic surgery, SGLT2i, and GLP-1RA groups.ResultsPatients in all 3 groups had improved metabolic parameters over a 12-month period. Patients with metabolic surgery achieved significantly better outcomes in BMI (?5.39, ?.56, ?.40 kg/m2, P < .001), % total weight loss (15.16%, 1.34%, 1.63%, P < .001), systolic (?2.21, ?.59, 1.28 mm Hg, P < .001) and diastolic (?1.16, .50, ?.13 mm Hg, P < .001) blood pressure, HbA1c (?1.80%, ?.77%, ?.80%, P < .001), triglycerides (?.64, ?.11, ?.09 mmol/L, P < .001), and estimated glomerular filtration rate (3.08, ?1.37, ?.41 mL/min/1.73m2, P < .001) after 12 months compared with patients with SGLT2i and GLP1-RA. Although the metabolic surgery group incurred the greatest direct medical costs (US$33,551, US$10,945, US$10,627, P < .001), largely due to the surgery itself and related hospitalization, the total monthly direct medical expenditure of metabolic surgery group became lower than that of SGLT2i and GLP-1RA groups at 7 months.ConclusionBeneficial weight loss and metabolic outcomes at 12 months were observed in all 3 groups, among which the metabolic surgery group showed the most remarkable effects but incurred the greatest medical costs. However, studies with a longer follow-up period are warranted to show long-term outcomes. 相似文献
47.
当利用放射线对胸部恶性肿瘤进行治疗时,位于纵隔的心脏会不可幸免受到照射,从而诱发放射性心脏损伤(radiation-induced heart disease, RIHD)。随着手术以及放化疗技术的提升,肿瘤患者生存时间得到延长,使得RIHD这一放疗远期并发症被越来越多的报道。因此,学者们对于RIHD的研究逐渐升温。目前国内外学者关于该疾病尚未形成统一的认识,临床上缺乏有效阻止其发生的方法。动物模型研究可为临床该疾病治疗及预防提供可靠证据,为此本文回顾分析近年来放射性心脏损伤动物模型实验研究情况,旨在为后续实验开展及临床应用提供参考。 相似文献
48.
49.
同步放化疗是不可手术局部晚期食管癌的标准治疗模式,国际推荐根治性放疗剂量为50.0~50.4Gy,但中国食管癌与西方国家在病理类型、生物学行为等方面大有不同,行根治性放疗剂量仍倾向于60Gy。增加放疗剂量能否带来生存获益成为临床亟待解决的问题。有研究认为高剂量放疗可提高局控率、改善生存,但也有研究认为提高剂量未能带来生存获益,且可增加不良反应事件发生率。因此,本文就食管癌根治性放疗剂量对预后的影响进行探讨,并通过放化疗后疗效评估对放疗剂量做出适当调整,以期达个体化放疗。 相似文献
50.
D. Sforza G. Iaria L. Petagna A. Parente A. Anselmo F. Sergi S. Marzio F. Corrado S. Telli T.M. Manzia G. Tisone 《Transplantation proceedings》2019,51(1):140-142