全文获取类型
收费全文 | 1231篇 |
免费 | 64篇 |
国内免费 | 4篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 28篇 |
妇产科学 | 4篇 |
基础医学 | 161篇 |
口腔科学 | 12篇 |
临床医学 | 107篇 |
内科学 | 394篇 |
皮肤病学 | 13篇 |
神经病学 | 96篇 |
特种医学 | 52篇 |
外科学 | 158篇 |
综合类 | 6篇 |
预防医学 | 116篇 |
眼科学 | 13篇 |
药学 | 57篇 |
中国医学 | 4篇 |
肿瘤学 | 73篇 |
出版年
2023年 | 3篇 |
2021年 | 18篇 |
2020年 | 11篇 |
2019年 | 28篇 |
2018年 | 38篇 |
2017年 | 18篇 |
2016年 | 19篇 |
2015年 | 22篇 |
2014年 | 41篇 |
2013年 | 53篇 |
2012年 | 72篇 |
2011年 | 74篇 |
2010年 | 42篇 |
2009年 | 42篇 |
2008年 | 63篇 |
2007年 | 59篇 |
2006年 | 65篇 |
2005年 | 73篇 |
2004年 | 66篇 |
2003年 | 50篇 |
2002年 | 66篇 |
2001年 | 44篇 |
2000年 | 47篇 |
1999年 | 50篇 |
1998年 | 10篇 |
1997年 | 10篇 |
1996年 | 3篇 |
1995年 | 11篇 |
1994年 | 7篇 |
1993年 | 4篇 |
1992年 | 25篇 |
1991年 | 15篇 |
1990年 | 20篇 |
1989年 | 15篇 |
1988年 | 8篇 |
1987年 | 14篇 |
1986年 | 9篇 |
1985年 | 10篇 |
1984年 | 8篇 |
1983年 | 3篇 |
1982年 | 4篇 |
1977年 | 9篇 |
1975年 | 5篇 |
1974年 | 8篇 |
1973年 | 4篇 |
1972年 | 10篇 |
1971年 | 4篇 |
1970年 | 3篇 |
1966年 | 2篇 |
1933年 | 2篇 |
排序方式: 共有1299条查询结果,搜索用时 15 毫秒
1.
Andreu Nolasco Eva M. Vicent-Castelló Pamela Pereyra-Zamora Pablo Caballero-Pérez Joaquín Moncho 《Gaceta sanitaria / S.E.S.P.A.S》2019,33(6):504-510
ObjectiveTo describe the evolution of mortality risks for complications due to medical care or surgery between the periods prior to (2002-2007) and after (2008-2013) the beginning of the economic crisis for Spain and by autonomous region, and to analyse the relationship between the changes in the risks of death and the socioeconomic impact of the crisis and the variation in health spending.MethodEcological study based on age-standardized mortality rates, synthetic index of vulnerability as a socioeconomic indicator and variation in health expenditure as an indicator of health expenditure. The relative risk of death between periods was estimated with Poisson regression models.ResultsThe number of deaths increased for Spain in the period studied. Although the relationship between the increase in public investment in health and the decrease in mortality due to this cause has not been clearly demonstrated, it was possible to determine that the autonomous regions with the lowest increase in health expenditure had rates higher than the rest throughout the period, and that the most vulnerable to the crisis and with the lowest increase in spending presented the greatest increase in the risk of death between the periods.ConclusionsGiven the increase in these deaths, due to avoidable failures of the system, it is necessary to continue investigating this cause of mortality. 相似文献
2.
Andreu Colom‐Cadena Ignasi Marco Xavier Fernndez Aguilar Roser Velarde Johan Espunyes Rosa Rosell Santiago Lavín Oscar Cabezn 《Transboundary and Emerging Diseases》2019,66(4):1619-1630
Since 2001, Pyrenean chamois (Rupicapra pyrenaica pyrenaica) populations have been affected by border disease virus (BDV) causing mortalities of more than 80% in some areas. Field studies carried out in France, Andorra, and Spain have shown different epidemiological scenarios in chamois populations. This study was designed to confirm the presence of BDV strains of a high and low virulence in free‐ranging chamois populations from Pyrenees and to understand the implications of these findings to the diverse epidemiological scenarios. An experimental infection of Pyrenean chamois with a high‐virulence (Cadí‐6) and low‐virulence (Freser‐5) BDV strains was performed. Pregnant and non‐pregnant animals with and without antibodies against BDV were included in each group. Cadí‐6 BDV strain was confirmed to be of high virulence for seronegative adults and their foetuses. The antibody negative chamois infected with Freser‐5 BDV strain did not show symptoms, presented less viral distribution and RNA load in tissues than Cadí‐6 group, and cleared the virus from the serum. However, foetuses died before the end of the experiment and RNA virus was detected in sera and tissues although with lower RNA load than the Cadí‐6 group. Chamois from both groups presented lesions in brain but the ones infected with the low‐virulence Freser‐5 BDV strain were mild and most likely transient. In both groups, seropositive pregnant females and all but one of their foetuses did not present viraemia or viral RNA in tissues. The existence of a low‐virulence strain has been confirmed experimentally and related to chamois population infection dynamics in the area where it was isolated. Such strain may persist in the chamois population through PI animals and may induce cross‐protection in chamois against high‐virulence strains. This study demonstrates that viral strain diversity is a significant factor in the heterogeneity of epidemiological scenarios in Pyrenean chamois populations. 相似文献
3.
4.
5.
Andreu Porta-Sánchez Andrew C.T. Ha Xuesong Wang Fahad Almehmadi Peter C. Austin Hadas D. Fischer Atif Al-Qubbany Diego Chemello Vijay Chauhan Eugene Downar Douglas S. Lee Kumaraswamy Nanthakumar 《The Canadian journal of cardiology》2019,35(2):169-177
Background
Catheter ablation of ventricular tachycardia (VT) can reduce the burden of ventricular arrhythmia (VA) but its effect on health care utilization and costs after such therapy is poorly known. We sought to compare the rates of cardiovascular (CV)-related hospitalizations, survival, and health care costs in patients with recurrent VT treated either with VT ablation or with medical therapy.Methods
One-hundred implantable cardioverter-defibrillator patients with structural heart disease who underwent VT ablation were included. Propensity score-matched patients with recurrent VT treated with medical therapy were identified from a prospective registry of approximately 7000 de novo implantable cardioverter-defibrillator patients. Outcomes and costs were ascertained using health administrative databases.Results
Among patients who underwent VT ablation, the cumulative rates of VA-related hospitalizations were lower in the 2 years after their ablation procedure compared with the year before (rate ratio, 0.3; 95% confidence interval [CI], 0.22-0.43). Rates of CV-related hospitalization and hospitalization because of VA post index date were similar between the VT ablation and medical therapy groups (hazard ratio [HR], 0.94; 95% CI, 0.57-1.54 and HR, 1.04; 95% CI, 0.57-1.91, respectively). Health care costs in the VT ablation patients were not increased post-ablation compared with the medical management group. The risk of all-cause mortality was lower among patients in the VT ablation group relative to the medical therapy group (HR, 0.64; 95% CI, 0.4-0.99).Conclusions
Patients who underwent VT ablation experienced a significant reduction in their rate of VA-related hospitalizations. Patients treated with VT ablation had similar rates of CV-related hospitalization compared with those treated with medical therapy without increased health care-related costs. 相似文献6.
Abdominal Radiology - There is discrepancy in the literature regarding the optimal dose of gadobenate for liver MRI. We evaluated the quality of liver MRIs performed in the same individual using... 相似文献
7.
Jonathan Cottreau Ryan Kelly Trevor Topp Andreu Costa Emily R. Filter Thomas Arnason 《Clinical journal of gastroenterology》2016,9(3):140-144
Collagenous colitis is a clinicopathologic syndrome characterized by chronic watery diarrhea and unique histopathologic features. Spontaneous colonic perforation in the setting of collagenous colitis is a highly unusual complication, with only three cases reported in the literature to date. We present a fourth case and propose a potential pathologic mechanism for acute colonic perforation in this patient population. 相似文献
8.
Francisco José Cereceda-Sánchez Juan Clar-Terradas Rut Moros-Albert Andreu Mascaró-Galmés Miguel Navarro-Miró Jesús Molina-Mula 《Atencion primaria / Sociedad Espa?ola de Medicina de Familia y Comunitaria》2021,53(9):102062
ObjectiveTo compare the basic airway and the advanced airway with the supraglottic device I-Gel®, by means of capnography during intermediate CPR.DesignRandomized experimental pilot study by groups.SettingOut-hospital care basic life support units on the Island of Mallorca.ParticipantsAdults attended after cardiorespiratory arrest of non-traumatic origin.InterventionsAdvanced airway management during instrumental CPR with I-Gel® or basic CPR with bag-valve-mask, under capnographic monitoring.Main measurementsCapnometric levels obtained according to the device used, number of insertions of the I-Gel®, cases without achieving correct insertion/ventilation by branches, achievement of ROSC in CPR and number of hospital live admissions.ResultsTwenty-three cases were recruited for analysis. The insertion success rate of the I-Gel® was 92.9% at the first attempt, the mean capnometric values were 16.3 mmHg in the control group and 27.4% in the intervention group. 34.8% (n = 8) of the patients achieved spontaneous circulation recovery at some point and 26.1% (n = 6) were admitted to hospital alive. The survival analysis, taking into account the arrival of the unit and the first minute of ventilations recorded together with the variable hospital admission, suggests a certain trend of greater survival in the intervention branch (P = .066).ConclusionsThe use of I-Gel® raises an improvement in the ventilation of the patients in PCR, evidenced by the mean capnometric values in the intervention group, finding no correlation with CPR outcome variables. 相似文献
9.
Cristina Casañ López Belén Rivaya Sánchez Gema Fernández Rivas Águeda Hernández Rodríguez Adrián Antuori Torres Georgina Linares Llamas Lurdes Matas Andreu 《Enfermedades infecciosas y microbiología clínica》2021,39(5):229-233
IntroductionSexually transmitted infections (STIs) are common in our environment, and trends have been increasing in the last few years. Different methods for STIs diagnosis have been applied by microbiology laboratories over years, but real-time PCR has improved this process. Our objective was to evaluate VIASURE Sexually Transmitted Diseases Real-Time PCR Detection kit (CerTestBiotec, S.L.) comparing with the real-time PCR technique used in our laboratory (Allplex? STI7 Essential Assay, Seegene) which was considered as reference assay.MethodsA total of 948 samples from different sites (vaginal, endocervical, urethral, rectal, pharyngeal swabs and urine samples) were analyzed from July to September 2018.ResultsA discordant result was obtained in 4.5% (43 samples). These discrepancies were mainly observed in threshold cycle (Ct) value next to the limit of detection. The k coefficient obtained shows a very high agreement between both methods with k values from 0.92 to 0.99.ConclusionsVIASURE Sexually Transmitted Diseases Real-Time PCR Detection kit provides a very good correlation with Allplex STI7 and therefore, it's a good tool for the diagnostic of STIs. Positive results with Ct value obtained from 35 and low amplification signal should be applied with caution and should be interpreted based on the patient's clinical data. 相似文献
10.