全文获取类型
收费全文 | 18908篇 |
免费 | 539篇 |
国内免费 | 20篇 |
专业分类
耳鼻咽喉 | 323篇 |
儿科学 | 621篇 |
妇产科学 | 789篇 |
基础医学 | 1096篇 |
口腔科学 | 220篇 |
临床医学 | 761篇 |
内科学 | 6162篇 |
皮肤病学 | 324篇 |
神经病学 | 2002篇 |
特种医学 | 433篇 |
外科学 | 3178篇 |
综合类 | 318篇 |
一般理论 | 1篇 |
预防医学 | 1311篇 |
眼科学 | 484篇 |
药学 | 653篇 |
1篇 | |
中国医学 | 59篇 |
肿瘤学 | 731篇 |
出版年
2023年 | 359篇 |
2022年 | 988篇 |
2021年 | 1012篇 |
2020年 | 832篇 |
2019年 | 2333篇 |
2018年 | 2494篇 |
2017年 | 866篇 |
2016年 | 310篇 |
2015年 | 328篇 |
2014年 | 1324篇 |
2013年 | 1069篇 |
2012年 | 783篇 |
2011年 | 1026篇 |
2010年 | 833篇 |
2009年 | 599篇 |
2008年 | 587篇 |
2007年 | 632篇 |
2006年 | 460篇 |
2005年 | 345篇 |
2004年 | 230篇 |
2003年 | 148篇 |
2002年 | 165篇 |
2001年 | 78篇 |
2000年 | 68篇 |
1999年 | 63篇 |
1998年 | 61篇 |
1997年 | 51篇 |
1996年 | 39篇 |
1995年 | 33篇 |
1994年 | 24篇 |
1993年 | 51篇 |
1992年 | 13篇 |
1991年 | 25篇 |
1990年 | 17篇 |
1989年 | 6篇 |
1988年 | 17篇 |
1987年 | 8篇 |
1985年 | 129篇 |
1984年 | 164篇 |
1983年 | 137篇 |
1982年 | 125篇 |
1981年 | 123篇 |
1980年 | 89篇 |
1979年 | 83篇 |
1978年 | 66篇 |
1977年 | 53篇 |
1976年 | 59篇 |
1975年 | 56篇 |
1974年 | 53篇 |
1973年 | 36篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
101.
Luciana Tornquist Debora Tornquist Letícia B. Schneiders Silvia I. R. Franke Jane D. P. Renner Czane P. Reuter 《Arquivos brasileiros de cardiologia》2022,119(2):236
BackgroundCardiometabolic risk has been shown to be inversely associated with cardiorespiratory fitness (CRF) and positively associated with body mass index (BMI).ObjectiveOur objective was to analyze the association of cardiometabolic risk factors with combined BMI and CRF in schoolchildren from a city in southern Brazil.MethodsCross-sectional study with a sample of 1252 schoolchildren aged seven to 17 years. Total cholesterol (TC), HDL-c, LDL-c, triglycerides (TG), systolic (SBP) and diastolic blood pressure (DBP) were evaluated. CRF and BMI were grouped into one variable and the schoolchildren were classified as eutrophic/fit, eutrophic/unfit, overweight-obese/fit, and overweight-obese/unfit. Crude and adjusted analyzes were performed using Poisson Regression and an alpha of 0.05 was adopted.ResultsOverweight-obese and fit schoolchildren showed a prevalence ratio (PR) of 1.50 (1.04 – 2.16) for altered TG, 3.05 (2.05 – 4.54) for elevated SBP, and 2.70 (1.87 – 3.88) for elevated DBP. Overweight-obese and unfit schoolchildren showed a PR for high TC of 1.24 (1.11 – 1.39) and 1.51(1.11 – 2.04) for low HDL levels. In addition, they had a risk of 2.07 (1.60 – 2.69) for altered TG, 3.36 (2.31 – 4.60) for elevated SBP and 2.42 (1.76 – 3.32) for altered DBP.ConclusionBMI played a central role in the association with risk and CRF was shown to attenuate the association between risk factors and obesity. Overweight-obese children and adolescents had a higher cardiometabolic risk, but the effect size was larger among the unfit. 相似文献
102.
头体针联合治疗小儿抽动秽语综合征25例 总被引:7,自引:0,他引:7
目的 针刺与单纯服用西药治疗小儿抽动秽语综合征的临床疗效差别。方法 针刺组采用辨证选取穴,西药组采用氟哌啶醇口服。结果 针刺组25例,有效率为93%,西药组24例,有效率为82%。结论 针刺治疗小儿抽动秽语综合征疗效满意。 相似文献
103.
104.
Isabela P. Loyola Mauri Flix de Sousa Thiago Veiga Jardim Marcela M. Mendes Weimar Kunz Sebba Barroso Ana Luiza Lima Sousa Paulo Csar B. Veiga Jardim 《Arquivos brasileiros de cardiologia》2022,118(5):875
Background The Himalayan salt (HS) has become a popular alternative for the traditional table salt (TS) due to its health benefit claims, particularly for individuals with arterial hypertension. However, despite the increase in HS consumption, there is still a lack of clinical evidence to support a recommendation for its consumption by health professionals.Objective This cross-over study aimed to compare the impact of HS and TS intake on systolic blood pressure (SBP) and diastolic blood pressure (DBP), and urinary sodium concentration in individuals with arterial hypertension.Methods This study recruited 17 female patients with arterial hypertension who ate out no more than once a week. Participants were randomized into two groups, to receive and consume either HS or TS. Before and after each intervention, participants had their blood pressure measured and urine collected for mineral analysis. A p-value < 0.05 was considered statistically significant.Results There were no statistically significant differences before and after the HS intervention for DBP (70mmHg vs. 68.5mmHg; p=0.977), SBP (118.5 mmHg vs. 117.5 mmHg; p= 0.932) and sodium urinary concentration (151 mEq/24h vs. 159 mEq/24; p=0.875). Moreover, the between-group analysis showed no significant differences after the intervention regarding SBP (117mmHg vs 119 mmHg; p=0.908), DBP (68.5 mmHg vs. 71mmHg; p= 0,645) or sodium urinary concentration (159 mEq/24h vs. 155 mEq/24h; p=0.734).Conclusion This study suggests that there are no significant differences on the impact of HS consumption compared to TS on blood pressure and sodium urinary concentration in individuals with arterial hypertension. 相似文献
105.
Alexandre de Matos Soeiro Bruno Biselli Tatiana C.A.T. Leal Aline Siqueira Bossa Maria Cristina Csar Srgio Jallad Priscila Gherardi Goldstein Patrícia Oliveira Guimares Carlos Vicente Serrano Jr Cesar Higa Nomura Dbora Nakamura Carlos Eduardo Rochitte Paulo Rogrio Soares Múcio Tavares de Oliveira Jr. 《Arquivos brasileiros de cardiologia》2022,118(5):894
BackgroundCoronary tomography angiography (CTA) has been mainly used for chest pain evaluation in low-risk patients, and few data exist regarding patients at intermediate risk.ObjectiveTo evaluate the performance of serial measures of sensitive troponin and CTA in intermediate-risk patients.MethodsA total of 100 patients with chest pain, TIMI risk scores of 3 or 4, and negative troponin were prospectively included. All patients underwent CTA and those with coronary stenosis ≥ 50% were referred to invasive coronary angiography. Patients with coronary lesions <50% were discharged and contacted 30 days later by a telephone call to assess clinical outcomes. Outcomes were hospitalization, death, and myocardial infarction at 30 days. The comparison between methods was performed by Kappa agreement test. The performance of troponin measures and CTA for detecting significant coronary lesions and clinical outcomes was calculated. Results were considered statistically significant when p < 0.05.ResultsCoronary stenosis ≥ 50% on CTA was found in 38% of patients and significant coronary lesions on coronary angiography were found in 31 patients. Two clinical events were observed. Kappa agreement analysis showed low agreement between troponin measures and CTA in the detection of significant coronary lesions (kappa = 0.022, p = 0.78). The performance of CTA for detecting significant coronary lesions on coronary angiography or for predicting clinical events at 30 days was better than sensitive troponin measures (accuracy of 91% versus 60%).ConclusionCTA performed better than sensitive troponin measures in the detection of significant coronary disease in patients with chest pain and intermediate risk for cardiovascular events. 相似文献
106.
107.
108.
Grynberg M Hesters L Bénard J Trèves R Fanchin R Frydman R Frydman N 《Journal de gynecologie, obstetrique et biologie de la reproduction》2011,40(2):103-108
Although female cancer incidence may be on rise, antineoplastic regimens have become more successful. As a result, an increasing number of women with cancer survive to endure the long-term consequences of chemotherapy. One of the most important long-term consequences of cancers treatments in young female is premature ovarian failure and infertility. Because of the increasing survival rates, many of these young women are seeking methods to preserve their fertility. Currently, embryo/oocytes cryoporeservation obtained after ovarian stimulation appears to provide the best fertility preservation option. However, patients may not have sufficient time to undergo ovarian stimulation prior to chemotherapy and/or the hormones used in ovarian stimulation are contra-indicated for estrogen-dependant tumors. In vitro maturation of oocytes (IVM) has been suggested to avoid ovarian stimulation and time requirement in patients with cancer, and can be combined with ovarian tissue cryobanking. In this review, we will discuss the position of IVM in the strategy of fertility preservation in young women. 相似文献
109.
Objetive
: To know Spanish Obstetrics and Gynaecology Society (SEGO) members about cesarean section on request.Method
Three questions appeared on SEGO web: 1) If a normal primigravid with a term, cephalic presentation foetus ask you for a caesarean section, would you do it?; 2) If a normal primigravid with a term, breach presentation foetus ask you for a caesarean section, would you do it?; 3) If a woman on her normal third pregnancy with two previous vaginal and with a term, breach presentation foetus ask you for a caesarean section, would you do it? Questions were asked in May 2006 and answers were collected 19th October 2006. Data analysis was processed with web page statistic method.Results
Among the 5300 members of SEGO, 1222 contacted the web page (23%). To question n° 1, 57.8% answered no, 24.8% yes and 17.4% had no answer. To question n° 2, 6.1% answered no, 93.8% yes and there were no abstention. To n° 3 question, 16.7% said no, 74.5% said yes and 8.8% has no opinion.Results are commented, advantages and disadvantages of caesarean are discussed as well as sanitary consequences of such an indication. 相似文献110.