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   20669篇
  免费   2616篇
  国内免费   374篇
耳鼻咽喉   126篇
儿科学   799篇
妇产科学   398篇
基础医学   1882篇
口腔科学   194篇
临床医学   2383篇
内科学   7189篇
皮肤病学   349篇
神经病学   1804篇
特种医学   344篇
外科学   2432篇
综合类   1313篇
现状与发展   1篇
一般理论   5篇
预防医学   1609篇
眼科学   715篇
药学   874篇
  2篇
中国医学   188篇
肿瘤学   1052篇
  2024年   55篇
  2023年   451篇
  2022年   258篇
  2021年   470篇
  2020年   439篇
  2019年   202篇
  2018年   776篇
  2017年   783篇
  2016年   846篇
  2015年   817篇
  2014年   748篇
  2013年   1019篇
  2012年   1468篇
  2011年   1494篇
  2010年   958篇
  2009年   923篇
  2008年   1288篇
  2007年   1233篇
  2006年   1070篇
  2005年   1186篇
  2004年   1503篇
  2003年   1309篇
  2002年   1006篇
  2001年   811篇
  2000年   304篇
  1999年   330篇
  1998年   373篇
  1997年   296篇
  1996年   141篇
  1995年   101篇
  1994年   86篇
  1993年   108篇
  1992年   90篇
  1991年   55篇
  1990年   61篇
  1989年   59篇
  1988年   56篇
  1987年   45篇
  1986年   39篇
  1985年   23篇
  1984年   20篇
  1983年   19篇
  1982年   20篇
  1981年   23篇
  1980年   14篇
  1977年   13篇
  1975年   13篇
  1974年   18篇
  1968年   17篇
  1928年   13篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
Proper management of Helicobacter pylori infection in clinical practice--when supported by evidence-based data--is expected to produce substantial cost-efficacy advantages. This consideration has prompted the Cervia Working Group to organise a meeting of experts to update the National Guidelines on the diagnosis and treatment of H. pylori infection in Italy. Recommendations in the new European Guidelines were considered in the National setting, here in the light of factors such as the incidence of gastric cancer and gastric lymphoma, the accessibility to different diagnostic tools, the prevalence of bacterial resistance against antibiotics, and the availability of different drugs. The main revisions in respect to the previous guidelines include H. pylori eradication in non-ulcer dyspepsia patients and in non-steroidal, anti-inflammatory drug users, as well as in patients with idiopathic thrombocytopenic purpura and iron deficiency anaemia. The stool antigen test is now accepted as a valid test for confirmation of H. pylori eradication following therapy. New therapeutic approaches have been recommended for both first- (sequential therapy) and second-line (levofloxacin-based) treatment in our country.  相似文献   
62.
Bronchiolitis obliterans syndrome (BOS) is the limiting factor to long-term survival after lung transplantation. Previous studies suggested respiratory viral tract infections are associated with the development of BOS. To identify the impact of virus detection in bronchoalveolar lavage (BAL) fluid, we analyzed BAL samples from 87 consecutive lung transplant recipients for human herpesvirus (HHV)-6, Epstein-Barr virus, Herpes simplex virus 1/2, Cytomegalovirus, respiratory syncytical virus and adenovirus by PCR. Acute rejection, BOS and death were recorded for a mean follow-up time of 3.27 +/- 0.47 years. Results of PCR analysis and other potential risk factors were entered into a Cox regression analysis of BOS predictors and death. Only acute rejection was a distinct risk factor for BOS of all stages, death and death from BOS. HHV-6 was detected in 20 patients. Univariate and multivariate analysis revealed that HHV-6 was associated with an increased risk to develop BOS > orb = stage 1 and death, separate from the risk attributable to acute rejection. Identification of HHV-6 DNA in BAL fluid is a potential risk factor for BOS. Our results warrant further studies to elucidate a possible causal link between HHV-6 and BOS.  相似文献   
63.
Aims The Abciximab Before Direct Angioplasty and Stenting inMyocardial Infarction Regarding Acute and Long-term Follow-up(ADMIRAL) study demonstrated that early inhibition of the plateletglycoprotein IIb/IIIa (GP IIb/IIIa) receptor with abciximabled to improved coronary patency, left ventricular function,and clinical outcomes. The current long-term follow-up studyevaluated the durability of the positive outcomes. Methods and results The randomized double-blind ADMIRAL trialenrolled 300 patients who received either abciximab plus stentingor placebo plus stenting for the treatment of ST-elevation myocardialinfarction (STEMI). Abciximab (bolus of 0.25 mg/kg bodyweight, followed by 12 h infusion of 0.125 µg/kgper min) was administered to 149 patients, whereas 151 patientsreceived placebo. Long-term follow-up was conducted in a blindedmanner by either patient chart review or telephone interview.Long-term follow-up data were obtained on 288 patients (96%).After 3 years, using an intent-to-treat analysis, the outcomeof all-cause mortality occurred in 9.1% of abciximab-treatedpatients when compared with 12.2% of placebo patients, absoluteand relative risk reductions of 3.1 and 25%, respectively (P=0.36).Parallel Kaplan–Meier curves were observed for the cumulativeincidence of death or re-infarction, which was reduced from16.9% in the placebo group to 11.8% in the abciximab group,absolute and relative risk reductions of 5.1 and 30%, respectively(P=0.20). Rates of recurrent ischaemia were significantly reducedfrom 21.7 to 11.5% (P=0.05). Conclusion Adjunctive abciximab to primary stenting for STEMIelicits favourable clinical outcomes with the same absoluterisk reductions of hard clinical outcomes from 30 days up to3 years of follow-up.  相似文献   
64.
65.
66.
67.
Concepts for stroke units that cover the acute phase vary. Therefore, the network of acute stroke units that is being set up in Austria in a uniform way is of general interest. This nationwide network has been established in accordance to evidence-based recommendations and prespecified criteria for available resources. The location for such a unit follows a maximum of 90-min isochrones (transport time) to the hospital. The quality of the network is currently documented and the results are reported. A nationwide stroke registry was prospectively performed on 15 stroke units that were already functional in this network. The aim was to document the quality performance of Austrian stroke units, focusing on rapid admissions, ready availability of investigations and therapies performed. Outcome measures were Barthel scale, Rankin score and percentages of complications. Between August 1998 and December 2000, 2,313 patients with ischemic stroke or with primary intracerebral hemorrhage admitted to an Austrian stroke unit within 24 h after onset of symptoms were prospectively included. Forty-three percent of the patients had a moderate or severe stroke. Fifty-seven percent of all patients were admitted to the stroke unit within 3 h after the onset of symptoms. Twenty-seven percent of these patients were brought in by ambulance accompanied by an emergency physician. Two percent of patients were admitted by helicopter. Fifty-four percent of patients had their first brain imaging within 30 min after admission, another 26% within 3 h. Intravenous thrombolysis was performed in 4.1% of patients. The overall stroke-unit mortality was about 6.8% and mortality at 3 months was 12.9%. The outcome at 3 months showed a modified Rankin Scale score of 0 or 1 in 47% of patients, denoting none or mild impairment. This network of acute stroke units is highly efficient in terms of rapid admissions, short intrahospital delays, as well as rapid use of readily available investigations. Stroke units seem to be well accepted by the general public and the medical community because our data show that all types of strokes are treated in Austrian stroke units, including severe strokes. The total number of concurrently treated acute strokes in other institutions across Austria is not known and no formal comparison with other systems of hospitalized care was undertaken, therefore further research is necessary.  相似文献   
68.
论公费医疗大额死亡病例的资源消耗与医学目的   总被引:4,自引:2,他引:2  
从北京市公费医疗大额消耗的92例死亡病例的费用结构及住院城数的统计,提示由住院日地长,贵重卫生资源的盲目过量投入等而致。这与中国国情不符。因此,医学目的概念应更新,以及应如何正确对待死亡病例的医疗服务值得进行讨论。  相似文献   
69.
谈医院改革趋势   总被引:4,自引:2,他引:2  
由于我国经济体制的转轨,经济增长方式的转换,正在带动、辐射、影响并制约着医院的建设和发展,医院改革将朝着以下趋势深化:一是在区域卫生发展规划指导下建设医院;二是开展社区服务是医院服务保障模式改革的大趋势;三是医院体制改革将寻求实现政府计划与市场调节的最佳结合;四是社会医疗保险制度改革将对医院带来重大影响;五是深化和完善补偿机制与价值体系改革仍是医院的重要课题;六是加大法规建设力度形成依法治院的新格局。  相似文献   
70.
通过对97例截瘫住院患者连续10年的Hb测定结果进行回顾性分组研究,结果表明,无并发症组10年中Hb分布较一致,其均值与正常人比较无显著性差异(P>0.05),但12.3%的病例Hb水平低于正常人下限;当截瘫并发泌尿系感染、尿毒症或难治性褥疮等病症时,则导致Hb水平的降低。提出Hb测定结果,可做为在整体水平上观察截瘫患者的治疗及康复效果的指标。  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