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   8970篇
  免费   360篇
  国内免费   135篇
耳鼻咽喉   175篇
儿科学   600篇
妇产科学   184篇
基础医学   740篇
口腔科学   183篇
临床医学   1055篇
内科学   754篇
皮肤病学   133篇
神经病学   1658篇
特种医学   767篇
外科学   1220篇
综合类   1010篇
现状与发展   1篇
预防医学   371篇
眼科学   61篇
药学   350篇
  5篇
中国医学   120篇
肿瘤学   78篇
  2024年   8篇
  2023年   148篇
  2022年   206篇
  2021年   267篇
  2020年   281篇
  2019年   259篇
  2018年   262篇
  2017年   209篇
  2016年   257篇
  2015年   271篇
  2014年   485篇
  2013年   491篇
  2012年   423篇
  2011年   511篇
  2010年   401篇
  2009年   459篇
  2008年   474篇
  2007年   443篇
  2006年   417篇
  2005年   392篇
  2004年   307篇
  2003年   235篇
  2002年   209篇
  2001年   163篇
  2000年   176篇
  1999年   162篇
  1998年   139篇
  1997年   140篇
  1996年   137篇
  1995年   115篇
  1994年   122篇
  1993年   114篇
  1992年   82篇
  1991年   86篇
  1990年   63篇
  1989年   49篇
  1988年   52篇
  1987年   59篇
  1986年   35篇
  1985年   64篇
  1984年   67篇
  1983年   25篇
  1982年   44篇
  1981年   33篇
  1980年   37篇
  1979年   31篇
  1978年   21篇
  1977年   17篇
  1976年   4篇
  1972年   3篇
排序方式: 共有9465条查询结果,搜索用时 46 毫秒
61.
双侧唇裂继发鼻畸形的矫正   总被引:5,自引:0,他引:5  
目的通过对双侧唇裂继发鼻畸形进行细致的病理解剖学分析,制定出具体的治疗目标,探讨矫正的有效手术方法。方法以双侧唇裂继发鼻畸形的病理解剖学为基础,将手术程序分为鼻小柱及鼻尖整形、鼻翼软骨的整形、鼻底的整形3个连续的步骤。结果自2000年以来应用上述方法手术矫正36例,其中畸形严重的双侧完全性唇裂术后患者22例,占61.6%。所有病例术后伤口均Ⅰ期愈合,鼻外形明显改善,无感染及皮瓣坏死等并发症发生。术后随访10~24个月,平均17个月,满意率高达100%。结论双侧唇裂继发鼻畸形具有其特有的病理解剖学特征,以解剖学特征基础制定具体手术方案,确保了最终疗效的满意率。  相似文献   
62.
目的探讨Pena术式治疗中高位肛门直肠畸形的并发症及预防治疗措施。方法回顾性分析行Pena肛门成形术的58例中高位肛门直肠畸形患儿的临床资料及肛门排便功能情况、并发症,采用肛门功能临床评分标准进行评价。结果58例中优良者45例(83.3%),差者9例(偶有污粪6例,大便失禁1例,便秘2例),有并发症者8例(14.8%),其中直肠黏膜脱垂3例,粪便潴留2例,大便失禁1例,尿漏1例,直肠回缩1例。结论真正理解Pena的“无血、解剖式”手术技术的精髓,提高手术技巧和精细操作,加强术后康复训练是减少并发症的关键。  相似文献   
63.
Bilateral perioral sensory dysfunction due to unilateral cerebral lesion is rare, and has been thought to be caused by midline brainstem lesions. Six patients are described herewith, with bilateral perioral sensory symptoms due to unilateral strokes that do not involve the mid-brainstem region. Brain-computed tomographic scan and magnetic resonance imaging demonstrated unilateral cerebral strokes in the thalamus, posterior limb of the internal capsule, basal ganglia, fronto-parietal cortex and the insular-frontal subcortical area. This observation suggests that bilateral perioral sensory symptoms do not have a localizing value. Possible pathogenetic mechanisms for this sign are discussed.  相似文献   
64.
脊髓血管畸形的临床发病率较低,仅为颅内血管畸形或脊髓新生物的1/10左右.本病可能与其它组织的血管异常同时存在,如皮肤血管痣(Cobb综合征),皮肤、粘膜病变,和Klipple-Trenaunay-Weber综合征等.本文报告的与胸腔血管畸形同时存在的脊髓血管畸形,我们尚未见诸报道.本文还结合文献就脊髓血管畸形导致脊髓功能损害的病理生理作了阐述.  相似文献   
65.
The validity of a simple clinical classification of acute ischaemic stroke   总被引:6,自引:0,他引:6  
The aim of the study reported here was to test the validity of a simple clinical classification of acute ischaemic stroke (Oxfordshire Community Stroke Project, OCSP) in predicting the site and size of cerebral infarction on computed tomography (CT). Consecutive patients admitted to hospital with acute ischaemic stroke were prospectively identified and classified into one of four clinical syndromes according to the OCSP classification, blind to the result of CT. The CT brain scans were classified blind to the clinical features into those demonstrating: small, medium or large cortical infarcts; small or large subcortical infarcts in the anterior circulation territory; and posterior cerebral circulation territory infarcts. A total of 108 patients were included. A recent infarct was seen. on the CT scan in 91 patients (84%), and the clinical classification correctly predicted the site and size of the cerebral infarct in 80 of these (88%; 95% confidence interval 77–92%). The positive predictive value was best for large cortical infarcts (0.94) and worst for small subcortical infarcts (0.63). The OCSP clinical classification is a reasonably valid way of predicting the site and size of cerebral infarction on CT and can, therefore, be used very early after stroke onset before the infarct appears on the scan.  相似文献   
66.
副乳癌的诊断和治疗(附12例报告)   总被引:5,自引:0,他引:5  
我院1978~1996年共收治副乳癌12例,占同期收治的乳癌1065例的113%。12例中,男性副乳癌1例,占同期收治男性乳癌17例的589%。副乳癌多发生于腋下或腹股沟处,这些部位邻近腋窝或腹股沟淋巴结丰富的区域,发生转移较早,预后较差。本组患者5年生存率为3637%,明显低于乳癌术后的5年生存率4583%(P<0.05)。  相似文献   
67.
目的为提高人口的基础素质提供理论依据。方法调查泰安市中心医院产科自1962年至1986年,25年间11年的出生登记资料。结果共15237名出生儿。对低体重儿死胎儿及畸形儿(三种不良儿)的发生情况进行了调查分析。共有低体重儿1245名,低体重率81.7‰,城市为61.3‰,农村108.3‰。死胎儿共183名,死胎率为12‰,城市为6‰,农村为19.8‰,RR=3.3。畸形儿总数为167名,畸形率11‰,城市6.7‰,农村16.5‰,RR=2。三种不良儿的发生率农村均明显高于城市,结论生育的最佳年龄在24岁至29岁之间,怀孕的最佳时间应在6至10月份之间。  相似文献   
68.
用改良的ELISA检测25例正常对照组和32例急性脑血管病患者的血清和脑脊液(CSF)中的脑型肌酸激酶同功酶BB(creatine kinase isoenzyme BB)浓度。32例急性脑血管病患者CSF CKBB平均水平为16.62±8.3ng/ml,明显高于对照组(7.5—4.8ng/ml)。发病24h内CSFCKBB轻微增高,24~48h达高峰,以后下降,7天左右尚未恢复正常。病初CSF CKBB水平明显高于恢复期。9例高血压性脑出血的血肿出血量(按CT片上血肿大小计算)与患者CSF CKBB有密切关系(r=0.8127,P<0.01)。血肿体积(X)与CSF CKBB浓度(y)的回归方程y—7.945±0.872X。  相似文献   
69.
We defined large striatocapsular infarcts as subcortical softenings of more than 20 mm in diameter involving the territories of the lateral and medial groups of lenticulostriate arteries. The aim of this study of 56 patients was to compare the clinical features and risk factors of these infarcts with those of cortical and lacunar infarcts. On the whole, our data suggest that both the clinical features and risk factors of large striatocapsular infarcts are similar to those of cortical infarcts, but significantly different from those of lacunar infarcts. The clinical manifestations of large striatocapsular infarcts with a maximum diameter of less than 50 mm may sometimes resemble those of lacunar infarcts because neuropsychological disorders are less frequent; however, our study indicates that, even in these cases, cardioembolic sources and artery-to-arteiy embolism are significantly more frequent in large striatocapsular than in lacunar infarcts, thus suggesting a different pathogenesis.  相似文献   
70.
Between January 1941 and June 1989, 46 children below the age of 18 with an arteriovenous malformation (AVM) were managed. There were 7 patients with AVM diagnosed before the age of 2; 10 patients were diagnosed between the ages of 3 and 10; and 29 patients were diagnosed between 11 and 18. There were equal numbers of male and female patients. Twenty-five of the AVMs were large (>5 cm longest diameter). All 7 AVMs diagnosed before the age of 2 were large. The usual clinical presentation was congestive heart failure, bruit and an enlarging head. Three patients underwent excision with 2 deaths and 1 excellent result. In 11 patients (aged 3–18) with AVM without history of hemorrhage, 3 had excision with 2 excellent and 1 fair result. Four remained stable. Four developed progressive deficits or hemorrhage. In 10 patients (aged 3–18) with AVM and hemorrhage who were treated medically, 7 (70%) had an episode of re-hemorrhage. Three patients had excision of AVM after re-hemorrhage, but before the age of 18 with an excellent result. Eighteen patients (aged 3–18) with AVM and a single episode of hemorrhage underwent excision with 17 excellent or good results and 1 fair result. The overall mortality was 7%. Eighty-five percent of the children with excision of AVM had an excellent or good result. The best treatment for AVM in children is surgical excision.Presented at the XVII Annual Meeting of the International Society for Pediatric Neurosurgery, Bombay 1989  相似文献   
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