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   743篇
  免费   53篇
  国内免费   2篇
耳鼻咽喉   2篇
儿科学   26篇
妇产科学   7篇
基础医学   104篇
口腔科学   3篇
临床医学   105篇
内科学   185篇
皮肤病学   13篇
神经病学   89篇
特种医学   35篇
外科学   68篇
综合类   3篇
一般理论   2篇
预防医学   50篇
眼科学   10篇
药学   38篇
肿瘤学   58篇
  2023年   9篇
  2022年   11篇
  2021年   25篇
  2020年   22篇
  2019年   25篇
  2018年   18篇
  2017年   13篇
  2016年   32篇
  2015年   23篇
  2014年   32篇
  2013年   33篇
  2012年   60篇
  2011年   63篇
  2010年   40篇
  2009年   38篇
  2008年   45篇
  2007年   63篇
  2006年   37篇
  2005年   47篇
  2004年   41篇
  2003年   33篇
  2002年   46篇
  2001年   1篇
  2000年   2篇
  1999年   7篇
  1998年   6篇
  1997年   4篇
  1996年   4篇
  1995年   2篇
  1994年   2篇
  1993年   3篇
  1992年   3篇
  1991年   2篇
  1990年   1篇
  1987年   1篇
  1986年   1篇
  1982年   1篇
  1979年   1篇
  1977年   1篇
排序方式: 共有798条查询结果,搜索用时 15 毫秒
101.
BackgroundPulmonary hypertension (PH) and right ventricular (RV) dysfunction have been associated with adverse outcome in patients with chronic heart failure. However, data are lacking in the setting of acute decompensated heart failure (ADHF). We sought to determine prognostic significance of PH in patients with ADHF and its interaction with RV function.MethodsWe studied 326 patients with ADHF. Pulmonary artery systolic pressure (PASP) and RV function were determined with the use of Doppler echocardiography, with PH defined as PASP >50 mm Hg. The primary end point was all-cause mortality during 1-year follow-up.ResultsPH was present in 139 patients (42.6%) and RV dysfunction in 83 (25.5%). The majority of patients (70%) with RV dysfunction had PH. Compared with patients with normal RV function and without PH, the adjusted hazard ratio (HR) for mortality was 2.41 (95% confidence interval [CI] 1.44–4.03; P = .001) in patients with both RV dysfunction and PH. Patients with normal RV function and PH had an intermediate risk (adjusted HR 1.78, 95% CI 1.11–2.86; P = .016). Notably, patients with RV dysfunction without PH were not at increased risk for 1-year mortality (HR 1.04, 95% CI 0.43–2.41; P = .94). PH and RV function data resulted in a net reclassification improvement of 22.25% (95% CI 7.2%–37.8%; P = .004).ConclusionsPH and RV function provide incremental prognostic information in ADHF. The combination of PH and RV dysfunction is particularly ominous. Thus, the estimation of PASP may be warranted in the standard assessment of ADHF.  相似文献   
102.
AimsTo report the prevalence of undiagnosed diabetes and its determinants among adults Cameroonian urban dwellers.MethodsOn May 17th 2011, a community-based combined screening for diabetes and hypertension was conducted simultaneously in four major Cameroonian cities. Adult participants were invited through mass media. Fasting blood glucose was measured in capillary blood.ResultsOf the 2120 respondents, 1591 (52% being men) received a fasting glucose test. The median age was 43.7 years, and 64.2% were overweight or obese. The sex-specific age adjusted prevalence (for men and women) were 10.1% (95% confidence interval [CI]: 8.1–12.1%) and 11.2% (95%CI: 9.1–13.3%) for any diabetes, and 4.6% (95%CI: 2.6–6.6%) and 5.1% (95%CI: 3.0–7.2%) for screened-detected diabetes, respectively. The prevalence of diabetes increased with increasing age in men and women (all p  0.001 for linear trend). Older age (p < 0.001), region of residence (p < 0.001), excessive alcohol intake (p = 0.02) were significantly associated with screened-detected diabetes, while physical inactivity, body mass index, and high waist girth were not significantly associated with the same outcome.ConclusionsPrevalence of undiagnosed diabetes is very high among Cameroonian urban dwellers, indicating a potentially huge impact of screening for diabetes, thus the need for more proactive policies of early detection of the disease.  相似文献   
103.
Effectiveness of topiramate in the prevention of childhood headaches   总被引:9,自引:0,他引:9  
BACKGROUND: Migraine is a significant problem for many children. Topiramate has been suggested to be effective for the prophylaxis of migraine in adults, but has not yet been examined in children. The drug has been demonstrated to be safe and effective for childhood seizure disorders. The objective of this study was to demonstrate the safety and efficacy of topiramate for the prevention of pediatric migraine. METHODS: Children with frequent migraine were prescribed topiramate for headache prevention. Dosages, serum levels, and Serum Glutamic Oxalacetic Transaminase (SGOT) levels were monitored. Changes in frequency, severity, and duration of headaches were recorded and changes in headache-related disability using PedMIDAS also were measured. RESULTS: Ninety-seven children were treated with topiramate, and 75 were reevaluated 88.7 +/- 35.7 days later, 41 were seen at a second follow-up, and 17 were seen at a third follow-up evaluation. The daily dose reached at second evaluation was 84.0 +/- 38.6 mg/day or 1.42 +/- 0.74 mg/kg/day. This corresponded to a mean serum level of 2.8 +/- 1.6 micro g/mL. The mean headache frequency was reduced from 16.5 +/- 10.0 to 11.6 +/- 10.2 days per month (P<0.001) with a further reduction to 9.4 +/- 8.4 days by the second follow-up (P<0.001). Severity and duration of headache also were reduced. Headache disability improved, with a reduction of Pediatric Migraine Disability Assessment score from 36.0 +/- 42.3 to 20.8 +/- 34.0 at the first follow-up (P<0.05), 19.1 +/- 22.0 at the second follow-up (P<0.005), and 10.9 +/- 16.9 at the third follow-up (P<0.001). Most patients tolerated topiramate well. The most common side effects reported were cognitive (12.5%), weight loss (5.6%), and sensory (2.8%). CONCLUSIONS: Topiramate is potentially an effective prophylactic medication for children with frequent migraine.  相似文献   
104.
105.
106.
107.
AimsAdolescents and young adults aged 15–39 years with cancer face unique medical, practical and psychosocial issues. In the UK, principal treatment centres and programmes have been designed to care for teenage and young adult patients aged 13–24 years in an age-appropriate manner. However, for young adults (YAs) aged 25–39 years with cancer, little access to age-specific support is available. The aim of this study was to examine this possible gap by qualitatively exploring YA care experiences, involving patients as research partners in the analysis to ensure robust results.Materials and methodsWe conducted a phenomenological qualitative study with YAs diagnosed with any cancer type between ages 25 and 39 years old in the last 5 years. Participants took part in interviews or focus groups and data were analysed using inductive thematic analysis. Results were shaped in an iterative process with the initial coders and four YA patients who did not participate in the study to improve the rigor of the results.ResultsSixty-five YAs with a range of tumour types participated. We identified seven themes and 13 subthemes. YAs found navigating the healthcare system difficult and commonly experienced prolonged diagnostic pathways. Participants felt under-informed about clinical details and the long-term implications of side-effects on daily life. YAs found online resources overwhelming but also a source of information and treatment support. Some patients regretted not discussing fertility before cancer treatment or felt uninformed or rushed when making fertility preservation decisions. A lack of age-tailored content or age-specific groups deterred YAs from accessing psychological support and rehabilitation services.ConclusionsYAs with cancer may miss some benefits provided to teenagers and young adults in age-tailored cancer services. Improving services for YAs in adult settings should focus on provision of age-specific information and access to existing relevant support.  相似文献   
108.
Varicella-zoster virus (VZV) infection of neuronal cells and the activation of cell-intrinsic antiviral responses upon infection are still poorly understood mainly due to the scarcity of suitable human in vitro models that are available to study VZV. We developed a compartmentalized human-induced pluripotent stem cell (hiPSC)-derived neuronal culture model that allows axonal VZV infection of the neurons, thereby mimicking the natural route of infection. Using this model, we showed that hiPSC-neurons do not mount an effective interferon-mediated antiviral response following VZV infection. Indeed, in contrast to infection with Sendai virus, VZV infection of the hiPSC-neurons does not result in the upregulation of interferon-stimulated genes (ISGs) that have direct antiviral functions. Furthermore, the hiPSC-neurons do not produce interferon-α (IFNα), a major cytokine that is involved in the innate antiviral response, even upon its stimulation with strong synthetic inducers. In contrast, we showed that exogenous IFNα effectively limits VZV spread in the neuronal cell body compartment and demonstrated that ISGs are efficiently upregulated in these VZV-infected neuronal cultures that are treated with IFNα. Thus, whereas the cultured hiPSC neurons seem to be poor IFNα producers, they are good IFNα responders. This could suggest an important role for other cells such as satellite glial cells or macrophages to produce IFNα for VZV infection control.  相似文献   
109.
While multifaceted post-hospitalization interventions can succeed in preventing hospital readmissions, many of these interventions are labor-intensive and costly. We hypothesized that a timely post-discharge primary care physician (PCP) visit alone might prevent hospital readmission. We conducted a retrospective cohort study to assess whether post-hospitalization PCP visits within 14 days of discharge were associated with lower rates of 30-day hospital readmission. In a secondary analysis we also assessed: whether visits with a PCP at 7-days post-discharge changed rates of hospital readmissions and whether post-hospitalization PCP visits were associated with decreased 90-day hospital readmissions. We included all adults with a PCP who were discharged from an inpatient medical service in a large, urban integrated academic health system from January 1, 2019 to September 9, 2019 in our analysis. We performed unadjusted bivariate analyses to measure the associations between having a PCP visit within 14 and 7 days of discharge and hospital readmission within 30 and 90 days. Then we constructed multivariate logistic regression models including patient medical and utilization characteristics to estimate the adjusted odds of a patient with a post-hospitalization PCP visit experiencing a 30-day hospital readmission (primary outcome) and 90-day readmission (secondary outcome). A total of 9236 patients were discharged; mean age was 57.9 years and 59.7% were female. Of the study population, 35.6% (n = 3284) and 24.1% (n = 2224) of patients had a post-hospitalization PCP visit within 14 days and or 7 days, respectively. Overall, 1259 (13.6%) and 2153 (23.3%) of discharged patients were readmitted at 30 and 90 days, respectively. In unadjusted analyses, having a post discharge PCP visit was not associated with decreased hospital readmission rates, but after adjusting for sociodemographic, medical and utilization characteristics, having a post-hospitalization PCP visit at 14 and 7 days was associated with lower hospital readmission rates at 30 days: 0.68 (95% CI 0.59–0.79) and 0.76 (95% CI 0.66–0.89), respectively; and 90 days: 0.76 (95% CI 0.68–0.85) and 0.80 (95% CI 0.70–0.91), respectively. In this large integrated urban academic health system, having a post-hospitalization PCP visit within 14- and 7-days of hospital discharge was associated with lower rates of readmission at 30 and 90 days. Further studies should examine whether improving access to PCP visits post hospitalization reduces readmissions rates.  相似文献   
110.

Background  

The education and activation programme (EAP) aims at coping with psychosocial determinants to prevent the development of chronic shoulder complaints (SCs). The effect of the EAP on functional limitations and patient-perceived recovery after 6 and 26 weeks is evaluated in a randomised clinical trial.  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