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   9034篇
  免费   2492篇
  国内免费   129篇
耳鼻咽喉   370篇
儿科学   193篇
妇产科学   250篇
基础医学   179篇
口腔科学   152篇
临床医学   2883篇
内科学   1703篇
皮肤病学   314篇
神经病学   685篇
特种医学   324篇
外科学   1302篇
综合类   361篇
现状与发展   2篇
预防医学   1736篇
眼科学   100篇
药学   199篇
  1篇
中国医学   99篇
肿瘤学   802篇
  2024年   61篇
  2023年   410篇
  2022年   115篇
  2021年   254篇
  2020年   486篇
  2019年   164篇
  2018年   559篇
  2017年   600篇
  2016年   616篇
  2015年   713篇
  2014年   711篇
  2013年   1038篇
  2012年   382篇
  2011年   338篇
  2010年   513篇
  2009年   628篇
  2008年   301篇
  2007年   234篇
  2006年   277篇
  2005年   196篇
  2004年   150篇
  2003年   116篇
  2002年   95篇
  2001年   183篇
  2000年   115篇
  1999年   153篇
  1998年   268篇
  1997年   285篇
  1996年   307篇
  1995年   246篇
  1994年   173篇
  1993年   117篇
  1992年   86篇
  1991年   85篇
  1990年   77篇
  1989年   93篇
  1988年   72篇
  1987年   56篇
  1986年   47篇
  1985年   52篇
  1984年   46篇
  1983年   43篇
  1982年   30篇
  1981年   42篇
  1980年   21篇
  1979年   13篇
  1978年   12篇
  1977年   15篇
  1976年   14篇
  1975年   9篇
排序方式: 共有10000条查询结果,搜索用时 234 毫秒
991.
992.
International concerns relating to healthcare professionals’ failure to rescue deteriorating patients exist. Web‐based training programs have been developed and evaluated in Western settings but further testing is required before application in non‐Western countries, as traditional modalities of learning may differ between cultures. We trialed an Australian English language online simulation program for the management of deteriorating patients, Feedback Incorporating Review and Simulation Techniques to Act on Clinical Trends (FIRST2ACTWeb), to test cultural acceptability, transferability, and educational impact. The study was designed as a quasi‐experimental evaluation of the FIRST2ACTWeb program with final year nursing students from a Bachelor of Nursing program at the University of Hong Kong. Participants completed pre‐course and post‐course tests, three interactive scenarios, and program evaluations. The program was positively evaluated, with significant improvements in knowledge, skills, self‐rating of performance, confidence, and competence. Outcomes were comparable to earlier evaluations with Australian students, demonstrating that an interactive simulation‐based program of patient deterioration management has cultural and language acceptability and transferability across communities with significant educational impact.  相似文献   
993.
994.
995.
Objective : To compare the early diagnostic efficiency of the cardiac troponin I (cTn-I) level with that of the cardiac troponin T (cTn-T) level, as well as the creatine kinase (CK), CK-MB, and myoglobin levels, for acute myocardial infarction (AMI) in patients without an initially diagnostic ECG presenting to the ED within 24 hours of the onset of their symptoms. Methods : A prospective, observational, cohort study was performed involving chest pain patients admitted to a large urban community hospital. Participants were consecutive consenting ED chest pain patients ≥30 years of age. Exclusions included duration of symptoms >24 hours, inability to complete data collection, receipt of CPR, and ST-segment elevation on the initial ECG. Measurements included levels of cTn-I, cTn-T, CK, CK-MB, and myoglobin at the time of presentation and 1, 2, 6, and 12–24 hours after presentation as well as presenting ECG and clinical follow-up. Confirmation of the diagnosis of AMI was based on World Health Organization criteria. Results : Of the 177 patients included in the study, 27 (15%) were diagnosed as having AMIs. The sensitivities of all 5 biochemical markers for AMI were poor at the time of ED presentation (3.7–33.3%) but rose significantly over the study period. The sensitivity of cTn-T was significantly better than that of cTn-I over the initial 2 hours, but both markers' sensitivities were low (<60%) during this time frame. The cTn-I was significantly more specific for AMI than was the cTn-T, but not significantly better than CK-MB or myoglobin. Likelihood ratio analysis showed that the biochemical markers with the highest positive likelihood ratios for AMI during the first 2 hours following ED presentation were myoglobin and CK-MB. From 6 through 24 hours, the positive likelihood ratios for cTn-I, CK-MB, and myoglobin were superior to those of CK and cTn-T. Conclusions : cTn-I, CK-MB, and myoglobin are significantly more specific for AMI than are CK and cTn-T. Myoglobin is the biochemical marker having the highest combination of sensitivity, specificity, and negative predictive value for AMI within 2 hours of ED presentation. Neither cTn-I nor cTn-T offers significant advantages over myoglobin and CK-MB in the early (≤2 hours) initial screening for AMI. The cardiac troponins are of benefit in identifying AMI ≤6 hours after presentation.  相似文献   
996.
About 15–20% of hospital inpatients are catheterized, and it has been estimated that in an average sized hospital 10–15 patients will die each year from catheter‐related sepsis. Reducing catheterization rates or indwell times has been shown to reduce associated sepsis. This study examined patient experience of catheterization; the rationale for the study was to broaden understanding of catheter impact as part of a wider quality improvement agenda. Fifty patients completed a detailed catheter‐experience patient questionnaire. The patients were all inpatients from 17 wards across a range of specialties. Data were sought on demographics, catheter status, experience and their knowledge of and involvement in the catheter care. Fifty percent gender split. Median catheter time was 5 d (range 2 h to long term). Median age 72 years (range 22–92). Thirty‐four percent (n = 17) of patients did not have the process and options discussed before catheterization. Eighteen percent did not know why they were catheterized. Patients experienced leaking (32%), ‘pain’ (26%), inconvenience (26%), embarrassment (24%), blocking (24%) with 8% finding their catheters ‘restrictive’. Fourteen percent felt they could have coped without the catheter. Urinary catheters have a profound and often negative effect on the inpatient experience. This information can help support and empower colleagues to push for less urinary catheter use in the non‐urological inpatient population and start to better understand the patient experience.  相似文献   
997.
Genealogical investigation of a large Norwegian family (F04) with autosomal dominant parkinsonism has identified 18 affected family members over four generations. Genetic studies have revealed a novel pathogenic LRRK2 mutation c.4309 A>C (p.Asn1437His) that co‐segregates with disease manifestation (LOD = 3.15, θ = 0). Affected carriers have an early age at onset (48 ± 7.7 SD years) and are clinically asymmetric and levodopa responsive. The variant was absent in 623 Norwegian control subjects. Further screening of patients from the same population identified one additional affected carrier (1 of 692) with familial parkinsonism who shares the same haplotype. The mutation is located within the Roc domain of the protein and enhances GTP‐binding and kinase activity, further implicating these activities as the mechanisms that underlie LRRK2‐linked parkinsonism. © 2010 Movement Disorder Society  相似文献   
998.
We interviewed 300 patients (54.7% male; mean age was 65.8 ± 9.5) attending the Movement Disorders Clinic at the Buenos Aires University Hospital to determine the prevalence of CATs use and their association with demographic, social, or disease‐specific characteristics among patients with Parkinson's disease (PD) in Buenos Aires, Argentina. We found that 25.7% of the PD patients interviewed (77/300) stated they had used CATs to improve their PD symptoms whereas 38.0% (114/300) had used some CATs without any relation to PD, at least once in life. At the moment of the interview, CATs prevalence use was 50.6% in the former group and 25.0% in the latter. The use of CATs was much more frequent among women and more common in the 50‐ to 69‐year age group. Friends and neighbors of the patients had most frequently recommended these therapies. No major association was observed between CATs use and the duration of the disease, side of initial involvement, PD phenotype, or the Hoehn and Yahr staging. Acupuncture, homeopathy, yoga, and therapeutic massage were the most widely used therapies. After the initiation of conventional treatment the use of massage, yoga, and acupuncture in patients using CATs to improve PD significantly increased. Neurologists should be aware and inquire about the use of CATs to rule out potentially harmful effects. © 2010 Movement Disorder Society  相似文献   
999.
1000.
Vascular injury is a rare but devastating complication of total hip arthroplasty. We present 2 cases of external iliac artery injury that complicated the removal of a chronically infected total hip arthroplasty where the acetabular component had migrated medial to Kohler's line. In both cases, hemostasis and reperfusion were achieved with the assistance of a vascular surgeon. This report describes the diagnosis, treatment, and associated risk factors for this rare complication. The combination of deep infection and medial migration of the acetabular component represents a high-risk situation for vascular injury. We advocate preoperative consultation with a vascular surgeon in this setting.  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