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   22511篇
  免费   2107篇
  国内免费   477篇
耳鼻咽喉   201篇
儿科学   205篇
妇产科学   552篇
基础医学   2287篇
口腔科学   184篇
临床医学   2365篇
内科学   3011篇
皮肤病学   209篇
神经病学   374篇
特种医学   591篇
外科学   2102篇
综合类   2145篇
一般理论   2篇
预防医学   1672篇
眼科学   54篇
药学   1754篇
  10篇
中国医学   459篇
肿瘤学   6918篇
  2023年   479篇
  2022年   870篇
  2021年   1296篇
  2020年   1012篇
  2019年   1468篇
  2018年   1485篇
  2017年   1210篇
  2016年   847篇
  2015年   894篇
  2014年   1881篇
  2013年   1707篇
  2012年   1221篇
  2011年   1319篇
  2010年   934篇
  2009年   987篇
  2008年   1178篇
  2007年   943篇
  2006年   727篇
  2005年   569篇
  2004年   522篇
  2003年   390篇
  2002年   238篇
  2001年   268篇
  2000年   236篇
  1999年   229篇
  1998年   182篇
  1997年   171篇
  1996年   181篇
  1995年   147篇
  1994年   148篇
  1993年   106篇
  1992年   72篇
  1991年   61篇
  1990年   50篇
  1989年   64篇
  1988年   42篇
  1987年   43篇
  1986年   34篇
  1985年   100篇
  1984年   125篇
  1983年   96篇
  1982年   126篇
  1981年   86篇
  1980年   78篇
  1979年   73篇
  1978年   45篇
  1977年   29篇
  1976年   33篇
  1975年   27篇
  1974年   25篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
《Cancer radiothérapie》2020,24(1):60-63
Hemosuccus Pancreaticus (HP) is a very rare upper gastro-intestinal haemorrhagic event whose causes can be aneurismal lesions, acute and chronic pancreatic inflammatory conditions, and pancreatic masses. We present 2 cases of patients who underwent stereotactic radiotherapy for pancreatic lesions who manifested signs of HP after treatment. Two male patients were diagnosed with an inoperable locally advanced pancreatic cancer and underwent 8 cycles of chemotherapy followed by stereotactic radiotherapy to the pancreatic lesion delivering 40 Gy in 8 fractions. The first patient complained of melena and had a necrotic tumoural mass with a new aneurysmal bulge 3 months after the SBRT. A stent was placed in the aneurysmal lesion, however, a few days later, the bleeding occurred again and the patient died. The other patient had local tumour progression 12 months after SBRT with a pancreatic mass eroding the near vessels. He developed a fast and massive bleeding. HP may occur after SBRT. Inflammation of the tumour mass can lead to erosion of the vessels with subsequent bleeding. The radiotherapy treatment may have contributed to the HP genesis. The treatment is complex and consists of the placement of a stent or surgery.  相似文献   
64.
ObjectiveTo investigate long-term health-related quality of life (HRQoL) changes over time in younger compared to older disease-free breast cancer survivors who participated in a prospective randomized exercise trial.MethodsSurvivors (aged 35–68 years) were randomized to a 12-month exercise trial after adjuvant treatment and followed up for ten years. HRQoL was assessed with the generic 15D instrument during follow-up and the younger (baseline age ≤ 50) and older (age >50) survivors’ HRQoL was compared to that of the age-matched general female population (n = 892). The analysis included 342 survivors.ResultsThe decline of HRQoL compared to the population was steeper and recovery slower in the younger survivors (p for interaction < 0.001). The impairment was also larger among the younger survivors (p = 0.027) whose mean HRQoL deteriorated for three years after treatment and started to slowly improve thereafter but still remained below the population level after ten years (difference −0.017, 95% CI: −0.031 to −0.004). The older survivors’ mean HRQoL gradually approached the population level during the first five years but also remained below it at ten years (difference −0.019, 95% CI: −0.031 to −0.007). The largest differences were on the dimensions of sleeping and sexual activity, on which both age groups remained below the population level throughout the follow-up.ConclusionsHRQoL developed differently in younger and older survivors both regarding the most affected dimensions of HRQoL and the timing of the changes during follow-up. HRQoL of both age groups remained below the population level even ten years after treatment.  相似文献   
65.
Résumé: La rémission du cancer peut être l’occasion pour certains patients d’une réelle détresse émotionnelle ainsi que d’une désadaptation psychologique appelées: syndrome de Lazare. Nous émettons trois hypothèses explicatives quant à la survenue de tels troubles. La première confronte l’issue du cancer aux concepts psychanalytiques de dette et de masochisme. La deuxième envisage les symptômes sous l’angle d’une réaction de sevrage. Et la dernière évoque le contrecoup traumatique des traitements.Dossier: «Cliniques du cancer»  相似文献   
66.
妇女围孕期增补叶酸能够有效预防神经管缺陷等疾病的发生。随着对叶酸研究的不断深入,叶酸补充中出现了诸多问题。本文简要综述了叶酸在服用方式以及基础和临床研究中出现的值得讨论、已经引起关注和需要进一步研究探讨的问题,并提出了深入研究叶酸可能的发展趋势。  相似文献   
67.
Introduction Amisulpride is a substituted benzamide that, at low doses, selectively blocks D2 and D3 presynaptic dopamine receptors, enhancing dopaminergic transmission in frontal cortex and limbic areas. Many clinical studies versus placebo, tricyclic antidepressants and selective serotonin reuptake inhibitors showed amisulpride antidepressant effect, supporting its safety and rapid onset of action. In oncological population, depression is quite frequent and difficult to treat because of the particular sensitivity of cancer patients to the antidepressants’ side effects. Goals of work The aims of this study were to evaluate efficacy, safety and tolerability of low doses of amisulpride (50 mg) in oncological, depressed patients during chemotheraphy. Materials and methods One hundred six consecutive cancer outpatients with depressive symptoms were treated in a prospective, intention to treat, 4-week study, and were evaluated in single-blind with Montgomery Asberg rating scale for depression (MADRS), clinical global impression (CGI) and dosage record treatment emergent symptom scale (DOTES) to assess side effects of treatment. Main results After 4 weeks of treatment, scores of MADRS and CGI significantly improved (p < 0.002; p < 0.001, respectively), with a reduction of depressive symptoms concerning both emotional (such as apparent sadness, reported sadness, inner tension, etc.) and physical cluster (such as lack of appetite, reduction in weight, tiredness and insomnia) with good tolerability (only two patients dropped out). Conclusions This study is the first trial on the use of amisulpride in a cohort of oncological, depressed patients during chemotherapy. Amisulpride demonstrated high efficacy and safety. Controlled studies are needed to confirm these preliminary data.  相似文献   
68.
目的:探讨癌症患者疼痛的护理措施。方法:对60例癌症患者疼痛进行正确评估,给予患者有效的心理支持和疼痛护理。结果:所有患者的疼痛得到有效缓解。结论:加强癌症患者的心理护理及药物指导能有效控制癌症疼痛,提高患者的生活质量。  相似文献   
69.
膀胱小细胞癌3例报告并文献复习   总被引:1,自引:0,他引:1  
目的:探讨膀胱小细胞癌(BSCC)的临床特征、病理学特征和诊治方法。方法:回顾性分析3例BSCC的临床资料。3例均为男性,年龄68~82岁,2例有间断无痛性肉眼血尿,1例有尿频尿急。1例B超检查见膀胱内有1.5cm×0.9cm稍强回声区,后伴弱声影,中心回声较低;1例膀胱镜检查见膀胱颈10~12点处有1cm×1cm乳头状突起,无蒂,广基,呈地毯样生长;1例盆腔CT及加强扫描示膀胱内有类圆形团块状影,大小约2.5cm×2.6cm。2例行经尿道膀胱肿瘤电切术,1例行膀胱部分切除术。结果:术后病理检查均报告为膀胱小细胞未分化癌。免疫组织化学结果:嗜铬蛋白颗粒均( ~ ),神经特异烯醇化酶均(-~±),例1突触素(-),例2突触素( ),例3突触素( ~ )。例1术后3年复发,患者拒绝行根治性膀胱全切术,服中药治疗10个月后死亡。例2术后8个月因膀胱小细胞癌转移而死于全身衰竭。例3术后病理检查结果为膀胱移行细胞癌2~3级,部分为小细胞未分化癌,局部伴腺样分化,3个月后复发,行根治性膀胱全切加双侧输尿管皮肤乳头术,术后随访15个月无肿瘤复发。结论:BSCC是一种少见的高度恶性的膀胱肿瘤,诊断主要靠病理学检查,早期即可发生转移,预后较差。行根治性切除术加联合化疗可提高治愈率。  相似文献   
70.
目的观察老年非小细胞肺癌立体定向放疗疗效,并探讨其预后因子。方法128例老年非小细胞肺癌患者行常规放疗结合立体定向放疗,定期随访。结果全组患者1年生存率65.72%,单因素分析表明肿瘤体积、肿瘤剂量、卡氏评分影响近期结果,多因素分析仅肿瘤体积和肿瘤剂量为近期疗效预后因子,与生存期有关的预后因素为近期疗效、肿瘤剂量、临床分期。结论立体定向放疗可延长生存时间,对Ⅲ期患者,肿瘤剂量提高至72Gy是安全的。  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