全文获取类型
收费全文 | 266891篇 |
免费 | 22322篇 |
国内免费 | 6054篇 |
专业分类
耳鼻咽喉 | 3779篇 |
儿科学 | 5938篇 |
妇产科学 | 5331篇 |
基础医学 | 22838篇 |
口腔科学 | 8577篇 |
临床医学 | 27456篇 |
内科学 | 26646篇 |
皮肤病学 | 3580篇 |
神经病学 | 12737篇 |
特种医学 | 8331篇 |
外国民族医学 | 46篇 |
外科学 | 25691篇 |
综合类 | 44709篇 |
现状与发展 | 22篇 |
一般理论 | 26篇 |
预防医学 | 31422篇 |
眼科学 | 3165篇 |
药学 | 22631篇 |
428篇 | |
中国医学 | 27173篇 |
肿瘤学 | 14741篇 |
出版年
2024年 | 1070篇 |
2023年 | 4944篇 |
2022年 | 9344篇 |
2021年 | 12467篇 |
2020年 | 12317篇 |
2019年 | 13239篇 |
2018年 | 11692篇 |
2017年 | 10415篇 |
2016年 | 9808篇 |
2015年 | 9124篇 |
2014年 | 17528篇 |
2013年 | 18012篇 |
2012年 | 15724篇 |
2011年 | 16938篇 |
2010年 | 13666篇 |
2009年 | 12072篇 |
2008年 | 11334篇 |
2007年 | 11695篇 |
2006年 | 10251篇 |
2005年 | 8788篇 |
2004年 | 7458篇 |
2003年 | 6585篇 |
2002年 | 5200篇 |
2001年 | 4500篇 |
2000年 | 3783篇 |
1999年 | 3129篇 |
1998年 | 2606篇 |
1997年 | 2405篇 |
1996年 | 2058篇 |
1995年 | 1880篇 |
1994年 | 1733篇 |
1993年 | 1518篇 |
1992年 | 1352篇 |
1991年 | 1270篇 |
1990年 | 1083篇 |
1989年 | 1009篇 |
1988年 | 977篇 |
1987年 | 863篇 |
1986年 | 769篇 |
1985年 | 2009篇 |
1984年 | 2224篇 |
1983年 | 1408篇 |
1982年 | 1835篇 |
1981年 | 1304篇 |
1980年 | 1123篇 |
1979年 | 979篇 |
1978年 | 795篇 |
1977年 | 596篇 |
1976年 | 730篇 |
1975年 | 511篇 |
排序方式: 共有10000条查询结果,搜索用时 0 毫秒
91.
Marisa Klein-Gitelman 《Clinical and Applied Immunology Reviews》2004,4(5):333-350
Systemic lupus erythematosus (SLE) is the archetypical immunologic disease. Approximately 20% of patients present in the first two decades of life. This article highlights some of the differences between pediatric and adult onset lupus.Children are defined as different from adults on the basis of age. Lupus presents with different gender ratios based on hormonal or pubertal status with more significant skewing toward female patients in the childbearing years. Female patients in the childbearing years appear to have a higher relative risk for mortality. Despite this, children have greater disease severity at onset based on the number of patients who present with significant organ inflammation, the amount of corticosteroids required and the abnormalities in lupus serologies including autoantibodies and low complements. Children present frequently with congenital and acquired complement defects. Children have an increased risk of infections that can be confused with lupus. They have a higher risk of serious pneumococcal infection and may have less protection from vaccinations received at the time of disease onset.The clinical immunology laboratory is critical in the diagnosis and treatment of pediatric SLE. The rapid analysis and transfer of laboratory results can be life saving for the child with suspected new onset lupus. The laboratory is also helpful in determining disease activity through analysis of immunologic trends over time in pediatric lupus patients. This is especially important in the noncompliant adolescent patient who has a correlation between disease activity and lupus serologic tests. Finally, the clinical immunology laboratory is an important tool for better understanding of the immunologic phenomena associated with lupus and of disease pathophysiology. 相似文献
92.
93.
目的 :探讨单纯疱疹性角膜炎是中西医联合用药的治疗方法。方法 :本组 10 0例 ( 10 6只眼 )单纯疱疹性角膜炎患者应用抗病毒药物联合清热解毒中药的疗效观察。结果 :本组病例治疗后总有效率 82 .0 8%。结论 :中西医联合治疗措施是我们对单纯疱疹性角膜炎治疗的一项新的探讨。 相似文献
94.
目的:观察盐酸托烷思琼对预防脑动脉瘤栓塞术患者术后恶心呕吐(PONV)的有效性和安全性。方法:选择行颅内动脉瘤栓塞术患者45例,随机分为3组,每组15例,于手术结束前30分钟A组患者缓慢静注盐酸托烷思琼5mg,B组患者缓慢静注盐酸托烷思琼3mg,C组患者给予生理盐水。术后观察并记录以下指标:(1)术后24h内恶心呕吐发生率及强度;(2)术后2、8h镇静评分(OAA/S);(3)术后2、8h平均动脉压(MAP),心率(HR);(4)各组不良反应的发生情况。结果:术后24h内两治疗组恶心呕吐发生率显著低于对照组,差异有统计学意义(P<0.05或P<0.01)。托烷思琼5mg组恶心呕吐发生率略低于3mg组,但差异无统计学意义(P>0.05)。结论:托烷思琼可降低脑动脉瘤栓塞术患者术后恶心呕吐的发生率。托烷思琼3mg不仅可以减少药物用量,而且能减少副作用的发生,是一种经济、有效、安全的止吐方法。 相似文献
95.
Fujihiko Iwata M.D. Yoshio Hanawa M.D. Hirotada Takashima M.D. Keichou Shimoura M.D. Youhei Nishibayashi M.D. 《Pediatrics international》1992,34(1):84-86
The pathogenesis and etiology of Kawasaki disease are unknown, but some studies suggest increased genetic susceptibility. The case is presented of an infant with Kawasaki disease whose father suffered from the same illness 21 years previously. The A, B and C loci of the HLA antigens were examined. 相似文献
96.
97.
The ultrasonograms of ulcerative colitis (UC) in active stage show hypoechoic changes of the colorectal wall from the mucosal layer to the deeper layers. These endoscopic ultrasound (EUS) changes of the wall recognized in active stage disappear or normalize in the stage of remission. When the stage of UC is exacerbated, the hypoechoic changes of the wall extend from the mucosal layer to the deeper layers with the increase of wall thickness. These EUS images of active UC are classified into the following types: UC‐M, thickening of the whole wall with the structure preserved; UC‐SM, hypoechoic changes reach the superficial portion of third layer with the thickening of whole wall; UC‐SM deep, hypoechoic changes reach the deeper portion of third layer with the thickening of whole wall; UC‐MP, hypoechoic changes reach the fourth layer with the thickening of whole wall; UC‐SS/SE, hypoechoic changes penetrate through the fourth layer with the thickening of whole wall. With the help of EUS we can demonstrate the severity of inflammation in UC. Moreover, in severe cases of UC, the treatment strategy including emergency surgery can be determined. EUS is a valuable method in the management of UC. 相似文献
98.
EFNS Guidelines on diagnosis and treatment of brain metastases: report of an EFNS Task Force 总被引:2,自引:0,他引:2
R. Soffietti P. Cornu J. Y. Delattre R. Grant F. Graus W. Grisold J. Heimans J. Hildebrand P. Hoskin M. Kalljo P. Krauseneck C. Marosi T. Siegal C. Vecht 《European journal of neurology》2006,13(7):674-681
The objectives have been to establish evidence-based guidelines and identify controversies regarding the management of patients with brain metastases. The collection of scientific data was obtained by consulting the Cochrane Library, bibliographic databases, overview papers and previous guidelines from scientific societies and organizations. A tissue diagnosis is necessary when the primary tumor is unknown or the aspect on computed tomography/magnetic resonance imaging is atypical. Dexamethasone is the corticosteroid of choice for cerebral edema. Anticonvulsants should not be prescribed prophylactically. Surgery should be considered in patients with up to three brain metastases, being effective in prolonging survival when the systemic disease is absent/controlled and the performance status is high. Stereotactic radiosurgery should be considered in patients with metastases of 3–3.5 cm of maximum diameter. Whole-brain radiotherapy (WBRT) after surgery or radiosurgery is debated: in case of absent/controlled systemic cancer and Karnofsky Performance score of 70 or more, one can either withhold initial WBRT or deliver early WBRT with conventional fractionation to avoid late neurotoxicity. WBRT alone is the treatment of choice for patients with single or multiple brain metastases not amenable to surgery or radiosurgery. Chemotherapy may be the initial treatment for patients with brain metastases from chemosensitive tumors. 相似文献
99.
Benign positional vertigo is a potentially disabling condition characterized by episodic vertigo following certain provocative head movements. In most patients it is self limiting; however, in a few it may prove intractable, causing considerable social morbidity. In these patients surgery may be considered. Surgery previously involved section of the vestibular or singular nerves, involving a significant risk to hearing and to the facial nerve. Ablation of the labyrinth may even be considered. The new surgical technique of occlusion of the posterior semicircular canal has proved to be curative in most patients with benign positional vertigo with little risk to hearing. This paper describes our experience of fenestration and occlusion of the posterior semicircular canal in four patients. 相似文献
100.
LYNDA E ALBERTYN 《Journal of Medical Imaging and Radiation Oncology》1992,36(1):17-22
Both systemic and local therapy, for conditions of the breast and unrelated to it, may produce manuno-graphic changes. Some of these are characteristic, such as the pattern of scarring seen in reduction mammo-plasty. In many other instances, however, the changes produced overlap features commonly seen in malignancy. A knowledge of the timing, natural history and spectrum of these changes will aid mammographic interpretation. 相似文献