全文获取类型
收费全文 | 2612篇 |
免费 | 80篇 |
国内免费 | 10篇 |
专业分类
耳鼻咽喉 | 15篇 |
儿科学 | 2篇 |
妇产科学 | 29篇 |
基础医学 | 205篇 |
口腔科学 | 15篇 |
临床医学 | 475篇 |
内科学 | 705篇 |
皮肤病学 | 9篇 |
神经病学 | 147篇 |
特种医学 | 82篇 |
外科学 | 127篇 |
综合类 | 91篇 |
预防医学 | 504篇 |
眼科学 | 4篇 |
药学 | 117篇 |
中国医学 | 13篇 |
肿瘤学 | 162篇 |
出版年
2024年 | 3篇 |
2023年 | 84篇 |
2022年 | 184篇 |
2021年 | 197篇 |
2020年 | 222篇 |
2019年 | 252篇 |
2018年 | 225篇 |
2017年 | 147篇 |
2016年 | 115篇 |
2015年 | 69篇 |
2014年 | 201篇 |
2013年 | 216篇 |
2012年 | 105篇 |
2011年 | 133篇 |
2010年 | 83篇 |
2009年 | 91篇 |
2008年 | 89篇 |
2007年 | 66篇 |
2006年 | 52篇 |
2005年 | 47篇 |
2004年 | 28篇 |
2003年 | 23篇 |
2002年 | 13篇 |
2001年 | 14篇 |
2000年 | 14篇 |
1999年 | 6篇 |
1998年 | 3篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1994年 | 7篇 |
1992年 | 2篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1975年 | 1篇 |
排序方式: 共有2702条查询结果,搜索用时 140 毫秒
181.
182.
《Enfermería clínica》2020,30(4):260-268
ObjectivesTo describe the changes in basic activities of daily living (BADL) function before and during hospital admission in older patients admitted to an acute medical unit and to assess the effect of age on loss of BADL function.MethodsProspective observational study. The study included 91 patients aged 65 and older consecutively admitted to an acute medical unit of an urban public teaching hospital in Portugal, between May and September 2017. Functional status was measured at three times: at hospital admission; at about 2 weeks before hospital admission (baseline); an on the discharge day. The functional condition was evaluated using the Katz index. Differences in scores for BADL between baseline and admission, between admission and discharge, and between baseline and discharge were used to define pre-admission, in-hospital and overall functional decline.ResultsPre-admission, in-hospital and overall functional decline occurred in 78.0%, 4.4% and 63.7% of the participants, respectively. In contrast, in-hospital functional improvement occurred in a minority of the patients (14.3%). Hospitalized older people are discharged with BADL function that is worse than their baseline function. The oldest patients are at high risk of poorer functional outcomes because they are less likely to recover BADL function lost before admission.ConclusionThese results emphasize the overriding need for implementing in-hospital processes to prevent functional decline and enhance functional recovery. This study also highlights the need for nurses to closely monitor the functional status of hospitalized older people, particularly in oldest-old patients. 相似文献
183.
《Revista brasileira de fisioterapia (S?o Carlos (S?o Paulo, Brazil))》2020,24(6):479-487
ObjectiveTo study the adherence of an Early Inpatient Exercise Program in patients with acute hip fracture, identify variables associated with its performance, and its association to one-year survival.MethodsObservational longitudinal study of a cohort of 509 patients, admitted consecutively with a hip fracture in La Paz University Hospital (Madrid, Spain). Data included sociodemographic variables, pre-fracture physical functioning, cognitive impairment, comorbidities, measure of exercise adherence (pre-surgery exercise, post-surgery exercise, and rehabilitation sessions) and vital status at follow-up. One year after the fracture, either patients or relatives were contacted by telephone to ascertain their vital status. Data were analyzed using logistic regressions and multivariate Cox proportional hazards regression.ResultsThree quarters of patients (76.0%) were able to comply with the Early Inpatient Exercise Program. Factors associated with adherence were: living at home (Odds Ratio (OR) = 3.39; 95% Confidence Interval (CI): 2.03, 5.64), absence of pre-fracture disability (OR = 3.78; 95% CI: 2.21, 6.47), absence of pre-fracture cognitive impairment (OR = 2.36; 95% CI: 1.36, 4.07) and comorbidities (OR = 1.66; 95% CI: 1.03, 2.67). Early Inpatient Exercise Program adherence was associated with one-year survival (HR = 1.62; 95% CI: 1.06, 2.49).ConclusionsThe adherence with an Early Inpatient Exercise Program is high and is associated with 1-year survival. It is important to make a stronger effort to encourage participation in Early Inpatient Exercise Program in the 24% currently non-compliant, and in those with cognitive and physical impairments. 相似文献
184.
加强老年流行病研究 科学指导老年健康防控 总被引:1,自引:0,他引:1
施小明 《中华预防医学杂志》2021,(1):1-3
我国目前面临着严峻的人口老龄化和高龄化形势,老年人特别是高龄老人作为我国人口中寿命最长和最脆弱的特殊群体,亟需针对此人群开展深入的科学研究。老年流行病学是研究流行病学理论与方法在老年人研究中的应用科学,整合多种方法开展老年人特殊健康特征分析,获取老年人健康流行病学规律。本期“老年流行病学”重点号文章围绕老年人群慢性病、... 相似文献
185.
The Covid-19 pandemic caused lockdown of economies, which in turn led to the worsening of the economic situation of many households. During the first wave of the Covid-19 pandemic governments undertook various measures to support economies and societies, including jobs protection along with financial support provision to people who suffered financial loss during the economic crisis. We analyse the economic situation of older Europeans, depending on their socio-economic status as well as country of residence characteristics, including economic and labour market changes during the first phase of the pandemic, the strictness of government policies but also the country development level using the Human Development Index. We use the results of the Survey of Health, Ageing, and Retirement in Europe (SHARE), including the SHARE Corona Telephone Survey, which was conducted during the first wave of the Covid-19 pandemic. Our results indicate that individual characteristics have a higher impact on individual economic stress, compared to country characteristics. However, country’s response to the consequences of the Covid-19 pandemic, but also the overall level of development influences the economic situation and ability to cope with the economic risks people aged 50 and over face. People in more developed countries have smaller difficulties in making ends meet, while the economic crisis and more stringent policies reduce chances to receive financial support and increase economic risks. 相似文献
186.
187.
Jacob Ruiter-Ligeti Michael H. Dahan Naama Steiner Alexander Volodarsky-Perel William Buckett 《Journal of assisted reproduction and genetics》2020,37(12):3103
PurposeThe aim of this study was to determine how female age at the end of the reproductive spectrum effects success of natural cycle intrauterine insemination (IUI) or IUI in combination with ovarian stimulation.MethodsWe performed a retrospective cohort study of women 43 years of age and older at the time of IUI in a single academic fertility center between January 2011 and March 2018. Primary outcomes were both pregnancies and live births per cycle of IUI. Data are presented as percentage or mean ± SD. Fisher exact and chi-squared analyses were performed.ResultsThere were 9334 IUI cycles conducted during the study period. Of these cycles, 325 IUIs (3.5%) were for women aged 43 years and over at the time of insemination (43.6 ± 0.8, range 43 to 47 years). Analysis of these 325 IUI cycles revealed 5 biochemical pregnancies (1.5%) and only 1 live birth (0.3%). The pregnancy rate did not differ between IUIs using donor sperm (N = 1/49, 2.0%) compared to IUIs with partner sperm (N = 4/276, 1.4%). The pregnancy rate did not differ between IUIs with gonadotropins (N = 2/211, 0.9%), clomiphene or letrozole (N = 2/78, 2.6%), or natural cycle (N = 1/36, 2.8%).ConclusionsThe use of intrauterine inseminations in women 43 years of age and older is an ineffective treatment strategy. This is irrespective of the use of ovarian stimulation or donor sperm. Costly gonadotropin injections did not increase the chance of pregnancy nor did oral medication when compared to natural cycle IUIs. 相似文献
188.
189.
190.
Jie Ren Ying-Mu Tong Rui-Xia Cui Zi Wang Qing-Lin Li Wei Liu Kai Qu Jing-Yao Zhang Chang Liu Yong Wan 《World journal of gastrointestinal oncology》2020,12(12):1394-1406
BACKGROUNDDue to the special clinical features and biologic characteristics of adolescent and young adult (AYA) cancers, AYA cancers are different from cancers in children and elderly individuals. However, there are few reports on AYA hepatocellular carcinoma (HCC).AIMTo investigate the overall survival (OS) of AYA (15-39 years) and elderly (40-74 years) patients with HCC.METHODSThe data of all the HCC cases were extracted from the Surveillance, Epidemiology, and End Results database from 2004 to 2015 and were then divided into two groups based on age: AYA group (15-39 years) and older group (40-74 years). Kaplan-Meier curves and log-rank tests were used to compare the OS of the two groups. Propensity score matching (PSM) was employed to analyze the OS difference between the two groups. The Cox proportional hazards regression model was used to perform multivariate analysis to explore the risk factors for OS of HCC patients.RESULTSCompared to elderly cancer patients, AYA patients with HCC had a worse Surveillance, Epidemiology, and End Results stage, including the distant stage (22.1% vs 15.4%, P < 0.001), and a more advanced American Joint Committee on Cancer (AJCC) stage, including AJCC III and IV (49.2% vs 38.3%, P < 0.001), and were more likely to receive surgery (64.5% vs 47.5%, P < 0.001). Before PSM, the AYA group had a longer survival in months (median: 20.00, interquartile range [IQR]: 5.00-62.50) than the older group (median: 15.00, IQR: 4.00-40.00) (P < 0.001). After PSM, the AYA group still had a longer survival in months (median: 21.00, IQR: 5.00-64.50) than the older group (median: 18.00, IQR: 6.00-53.00) (P < 0.001). The Cox proportional hazards regression model showed that advanced age (hazard ratio [HR] = 1.405, 95%CI: 1.218-1.621, P < 0.001) was a risk factor for OS of HCC patients. In the subgroup analysis, the Cox proportional hazards regression model showed that in AJCC I/II HCC patients, advanced age (HR = 1.749, 95%CI: 1.352-2.263, P < 0.001) was a risk factor for OS, while it was not a risk factor in AJCC III/IV HCC patients (HR = 1.186, 95%CI: 0.997-1.410, P = 0.054) before PSM. After PSM, advanced age (HR = 1.891, 95%CI: 1.356-2.637, P < 0.001) was still a risk factor for OS in AJCC I/II HCC patients, but was not a risk factor for OS in AJCC III/IV HCC patients (HR = 1.192, 95%CI: 0.934-1.521, P = 0.157) after PSM.CONCLUSIONAYA patients with HCC have different clinical characteristics from older adults. In different AJCC stages, the two groups of patients have different OS: In AJCC I/II HCC patients, advanced age is a risk factor for OS, but it is not a risk factor for OS in the AJCC III/IV HCC patient group. 相似文献