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   821篇
  免费   55篇
  国内免费   2篇
耳鼻咽喉   4篇
儿科学   32篇
妇产科学   5篇
基础医学   82篇
口腔科学   11篇
临床医学   59篇
内科学   192篇
皮肤病学   10篇
神经病学   22篇
特种医学   85篇
外科学   84篇
综合类   136篇
预防医学   73篇
眼科学   6篇
药学   37篇
肿瘤学   40篇
  2022年   2篇
  2021年   31篇
  2020年   2篇
  2019年   8篇
  2018年   11篇
  2017年   4篇
  2016年   7篇
  2015年   12篇
  2014年   10篇
  2013年   13篇
  2012年   22篇
  2011年   18篇
  2010年   29篇
  2009年   28篇
  2008年   36篇
  2007年   33篇
  2006年   33篇
  2005年   25篇
  2004年   37篇
  2003年   23篇
  2002年   28篇
  2001年   21篇
  2000年   21篇
  1999年   25篇
  1998年   39篇
  1997年   24篇
  1996年   32篇
  1995年   16篇
  1994年   35篇
  1993年   12篇
  1992年   8篇
  1991年   14篇
  1990年   15篇
  1989年   21篇
  1988年   20篇
  1987年   22篇
  1986年   23篇
  1985年   22篇
  1984年   15篇
  1983年   16篇
  1982年   7篇
  1981年   11篇
  1980年   9篇
  1979年   6篇
  1978年   3篇
  1977年   4篇
  1976年   6篇
  1975年   4篇
  1974年   3篇
  1972年   3篇
排序方式: 共有878条查询结果,搜索用时 359 毫秒
871.
872.
The "ambiance" of a space has an effect on people using the space. In recent years, design for health care environments has begun to include esthetic enhancements in an attempt to reduce stress and anxiety, increase patient satisfaction, and promote health and healing. In this paper, the authors survey the existing research on those elements of the built and natural environment most often asserted by proponents as being inherently healing or promoting health. We postulate a hierarchy of effect of environmental elements ranging from simply nontoxic to safe (both physically and psychologically) to "providing a positive context" to being actively salutogenic. Most relevant research has been concentrated on a limited number of settings and is inadequate to inform the creation of design guidelines for the physical elements of an optimal healing environment. Opportunities exist to make meaningful contributions in this area that are likely to make a significant impact on health outcomes of human beings.  相似文献   
873.
Patch tests versus use tests in skin irritation risk assessment   总被引:1,自引:0,他引:1  
In the risk assessment of the ability of a substance or preparation to cause skin irritation, a patch test involving human volunteers is often seen as providing definitive information. However, the skin exposure conditions found in an occluded patch may be far removed from those in a particular use situation, not least for such reasons as the high dose per unit area, the duration of exposure and the maceration of the skin. Whilst these factors may enhance sensitivity in the identification of intrinsic hazard, they may do little to ensure accurate safety evaluation for real use. In this paper, we report data from a series of studies with an unmarketed facial skin cosmetic product. Whilst the product was unexpectedly highly irritating in a standard patch test in 30 volunteers, subsequent use tests, including a 6× daily open application to the elbow for 3 weeks and 2× daily application in a half-face test lasting 3 to 4 weeks and involving 52 volunteers failed to show any evidence of skin irritation. It is concluded that the most meaningful results for skin irritation risk assessment are likely to come from studies which involve relevant patterns of exposure.  相似文献   
874.
Cesarean births and associated morbidity and mortality have reached near epidemic proportions. The National Partnership for Maternal Safety under the guidance of the Council on Patient Safety in Women's Health Care responded by developing a patient safety bundle to reduce the number of primary cesarean births. Safety bundles outline critical practices to implement in every maternity unit. This National Partnership for Maternity Safety bundle, as with other bundles, is organized into four domains: Readiness, Recognition and Prevention, Response, and Reporting and Systems Learning. Bundle components may be adapted to individual facilities, but standardization within an institution is advised. Evidence‐based resources and recommendations are provided to assist implementation.  相似文献   
875.
876.
Background/aimWe aimed to determine the presence of subclinical atherosclerosis using carotid intima-media thickness (CIMT) and biochemical parameters in children and adolescents with congenital adrenal hyperplasia (CAH).Materials and methods Thirty-four patients with classic congenital adrenal hyperplasia due to 21-hydroxylase deficiency on regular glucocorticoid treatment for ≥3 years and 31 healthy subjects were included in the study. The patients were divided into two groups according to the degree of control of the clinic, laboratory, and radiological parameters as a) “uncontrolled” [n= 22; with increased height velocity (HV) standard deviation score (SDS) (≥2 SDS), advanced bone age, serum 17-OH progesterone <2.0 and ≥10.0 ng/mL or androstenedione <0.3 and ≥ 3.0 ng/mL] or b) “controlled” [n= 12; with HV SDS < 2, bone age (BA)/ chronologic age (CA) ratio < 1.2, serum 17-OH progesterone between 2 and 10 ng/mL and androstenedione between 0.3 and 3.0 ng/mL]. Ultrasonographic examination of carotid artery was performed by the same radiologist using a B-mode ultrasound system.Results There was no significant difference between the CAH and control groups in terms of median (IQR) CIMT values [0.47 (0.05) mm and 0.47 (0.07) mm, respectively; p > 0.05]. When subgroup comparisons were done in terms of median (IQR) CIMT values, there was no significant difference among the controlled, uncontrolled, and healthy control groups [0.45 (0.03) mm, 0.47 (0.04) mm, 0.47 (0.07) mm, respectively; p> 0.05]. In addition, CIMT levels were similar according to sex and disease control status.Conclusion In this study, the CIMT values of CAH cases were similar to those of healthy subjects.  相似文献   
877.
Background/aim Coronavirus disease 2019 (COVID-19) is a disease with a high rate of progression to critical illness. However, the predictors of mortality in critically ill patients admitted to the intensive care unit (ICU) are not yet well understood. In this study, we aimed to investigate the risk factors associated with ICU mortality in our hospital.Materials and methods In this single-centered retrospective study, we enrolled 86 critically ill adult patients with COVID-19 admitted to ICU of Dokuz Eylül UniversityHospital (İzmir, Turkey) between 18 March 2020 and 31 October 2020. Data on demographic information, preexisting comorbidities, treatments, the laboratory findings at ICU admission, and clinical outcomes were collected. The chest computerized tomography (CT) of the patients were evaluated specifically for COVID-19 and CT score was calculated. Data of the survivors and nonsurvivors were compared with survival analysis to identify risk factors of mortality in the ICU.Results The mean age of the patients was 71.1 ± 14.1 years. The patients were predominantly male. The most common comorbidity in patients was hypertension. ICU mortality was 62.8%. Being over 60 years old, CT score > 15, acute physiology and chronic health evaluation (APACHE) II score ≥ 15, having dementia, treatment without favipiravir, base excess in blood gas analysis ≤ –2.0, WBC > 10,000/mm³, D-dimer > 1.6 µg/mL, troponin > 24 ng/L, Na ≥ 145 mmol/L were considered to link with ICU mortality according to Kaplan–Meier curves (log-rank test, p < 0.05). The APACHE II score (HR: 1.055, 95% CI: 1.021–1.090) and chest CT score (HR: 2.411, 95% CI:1.193–4.875) were associated with ICU mortality in the cox proportional-hazard regression model adjusted for age, dementia, favipiravir treatment and troponin. Howewer, no difference was found between survivors and nonsurvivors in terms of intubation timing.ConclusionsCOVID-19 patients have a high ICU admission and mortality rate. Studies in the ICU are also crucial in this respect. In our study, we investigated the ICU mortality risk factors of COVID-19 patients. We determined a predictive mortality model consisting of APACHE II score and chest CT score. It was thought that this feasible and practical model would assist in making clinical decisions.  相似文献   
878.
BackgroundTo date, the coronavirus disease 2019 (COVID-19) caused more than 2.6 million deaths all around the world. Risk factors for mortality remain unclear. The primary aim was to determine the independent risk factors for 28-day mortality.Materials and MethodsIn this retrospective cohort study, critically ill patients (≥ 18 years) who were admitted to the intensive care unit due to COVID-19 were included. Patient characteristics, laboratory data, radiologic findings, treatments, and complications were analyzed in the study.ResultsA total of 249 patients (median age 71, 69.1% male) were included in the study. 28-day mortality was 67.9% (n = 169). The median age of deceased patients was 75 (66–81). Of them, 68.6% were male. Cerebrovascular disease, dementia, chronic kidney disease, and malignancy were significantly higher in the deceased group. In the multivariate analysis, sepsis/septic shock (OR, 15.16, 95% CI, 3.96–58.11, p < 0.001), acute kidney injury (OR, 4.73, 95% CI, 1.55–14.46,p = 0.006), acute cardiac injury (OR, 9.76, 95% CI, 1.84–51.83, p = 0.007), and chest CT score higher than 15 (OR, 4.49, 95% CI, 1.51-13.38, p = 0.007) were independent risk factors for 28-day mortality.ConclusionEarly detection of the risk factors and the use of chest CT score might improve the outcomes in patients with COVID-19.  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