全文获取类型
收费全文 | 1500篇 |
免费 | 84篇 |
国内免费 | 14篇 |
专业分类
耳鼻咽喉 | 5篇 |
儿科学 | 28篇 |
妇产科学 | 44篇 |
基础医学 | 176篇 |
口腔科学 | 17篇 |
临床医学 | 99篇 |
内科学 | 514篇 |
皮肤病学 | 6篇 |
神经病学 | 162篇 |
特种医学 | 61篇 |
外科学 | 164篇 |
综合类 | 3篇 |
一般理论 | 2篇 |
预防医学 | 111篇 |
眼科学 | 31篇 |
药学 | 48篇 |
中国医学 | 6篇 |
肿瘤学 | 121篇 |
出版年
2024年 | 2篇 |
2023年 | 15篇 |
2022年 | 23篇 |
2021年 | 50篇 |
2020年 | 24篇 |
2019年 | 36篇 |
2018年 | 45篇 |
2017年 | 39篇 |
2016年 | 25篇 |
2015年 | 34篇 |
2014年 | 69篇 |
2013年 | 76篇 |
2012年 | 132篇 |
2011年 | 158篇 |
2010年 | 81篇 |
2009年 | 65篇 |
2008年 | 112篇 |
2007年 | 100篇 |
2006年 | 94篇 |
2005年 | 72篇 |
2004年 | 93篇 |
2003年 | 86篇 |
2002年 | 69篇 |
2001年 | 11篇 |
2000年 | 14篇 |
1999年 | 10篇 |
1998年 | 18篇 |
1997年 | 5篇 |
1996年 | 9篇 |
1995年 | 6篇 |
1994年 | 6篇 |
1993年 | 6篇 |
1992年 | 1篇 |
1991年 | 4篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1988年 | 1篇 |
1987年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有1598条查询结果,搜索用时 15 毫秒
991.
Joan Gené Badia Joan Carles Contel Segura Antonio Hidalgo García Alícia Borràs Santos Montserrat Porta Borges Anna Oliver Olius Montse Saus Arus Carlos Ascaso Terren Marti?o Pi?eiro González Francisco Cegri Lombardo Esther Limón Ramírez Antonio Aranzana Martínez Antonio Heras Tebar Ramón Noguera Rodríguez Roser Pedret Llaberia Manuel Borrell Mu?oz M. Dolors Camprubí Casellas Jacinto Ortiz Molina Jaume Martín Royo Susana Gonzalez Martinez 《Atencion primaria / Sociedad Espa?ola de Medicina de Familia y Comunitaria》2009,41(2):91-101
ObjectiveTo identify which social and health variables are associated with receiving social services in patients included in home care programmes with the implementation of the Dependence Law.DesignCross-sectional study.Setting72 primary health care teams in Catalonia.PatientsPatients over 64 years old with chronic diseases in home care programmes in Catalonia.MeasurementsHealth status variables: Charlson, Barthel, Pfeiffer, Braden and Gijon, data from their carer (Zarit), self perception of health (SF-12), health professional visits, as well as: emergency visits, temporary admissions, and final results such as death or definitive admission in a nursing home or a hospital.ResultsA total of 1068 patients were included, 46.8% of the patients received some kind of social service, public or private. We observed that the variables related to receive some kind of social services are: high dependence (Barthel test), pressure sores and home care rehabilitation. Barthel test is highly associated with having social problems (Gijon test), living without an informal carer, more than 2 GP visits and having additional private health care.ConclusionsTo be more fair, the evaluation of the provisions of the Dependence Law should also consider the health status of the patient. With the implementation of this law we can observe difficulties in access to social services for middle class patients. These patients do not have access to public social assistance and cannot pay for a private one. Social services are still an alternative to family care. 相似文献
992.
Rovaris M Judica E Sastre-Garriga J Rovira A Sormani MP Benedetti B Korteweg T De Stefano N Khaleeli Z Montalban X Barkhof F Miller DH Polman C Thompson AJ Filippi M 《Multiple sclerosis (Houndmills, Basingstoke, England)》2008,14(4):455-464
Although the mechanisms underlying the accumulation of disability in primary progressive (PP) multiple sclerosis (MS) are still unclear, a major role seems to be played by 'occult' tissue damage. We investigated whether conventional and magnetization transfer (MT) MRI may provide complementary information for the assessment of PPMS severity. Conventional and MT MRI scans from 226 PPMS patients and 84 healthy controls were collected for centralized analysis. The expanded disability status scale (EDSS) score was rated at the time of MRI acquisition. T2 lesion volume, normalized brain volume (NBV) and cervical cord cross-sectional area (CSA) were measured. Magnetization transfer ratio (MTR) histograms from whole brain tissue, normal-appearing white matter and grey matter (NAGM) were also obtained. Mean NBV, CSA and MTR histogram-derived metrics showed significant inter-centre heterogeneity. After correcting for the acquisition centre, pooled average MTR and histogram peak height values were different between PPMS patients and controls for all tissue classes (P-values between 0.03 and 0.0001). More severe brain and cord atrophy and MT MRI-detectable NAGM damage were found in patients who required walking aids than in those who did not (P-values: 0.03, 0.001 and 0.016). A composite score of NBV, CSA, whole brain and NAGM MTR histogram peak height z-scores was correlated with patients' EDSS (r = 0.37, P 0.001). Magnetization transfer MRI might provide information complementary to that given by conventional MRI when assessing PPMS severity. Sequence-related variability of measurements makes the standardization of MT MRI acquisition essential for the design of multicentre studies. 相似文献
993.
The morbidity and mortality of herpes simplex encephalitis have decreased since the 1980s with the use of antivirals, but have remained stable in the last couple of years. One cause of morbidity is the development of focal hemorrhagic necrosis and edema in the temporal lobe, giving rise to space-occupying lesions, with a subsequent elevation of intracranial pressure. In some cases, the necrosis and edema can be refractory to medical treatment, with fatal outcome. Under these circumstances, some authors proposed decompressive craniectomy to treat severe intracranial hypertension and prevent serious neurologic deficits. We report the clinical outcomes of 2 adolescents affected with herpes simplex encephalitis who developed, during the course of their illness, severe intracranial hypertension refractory to medical treatment. Decompressive surgery was undertaken, with good outcomes in both patients. 相似文献
994.
Díaz R Gual A García M Arnau J Pascual F Cañuelo B Rubio G de Dios Y Fernández-Eire MC Valdés R Garbayo I 《Social psychiatry and psychiatric epidemiology》2008,43(1):1-10
OBJECTIVE: To identify the possible risk factors and negative outcomes associated with parental alcoholism. A secondary aim was to determine the influence of the family density of alcoholism on children of alcoholics' (COAs) psychological functioning. METHOD: A multisite epidemiological study was conducted in 8 Spanish cities, recruiting a total sample of 371 COAs (whose parents were in contact with alcohol treatment centers and accepted to participate in this study) and 147 controls (from schools in the same localities as COAs). Both groups were 6-17 years old and received a comprehensive evaluation of mental disorders (no symptoms, subclinical symptoms or clinical diagnosis for each disorder; according to DSM-IV criteria); alcohol and other substance use (none, occasional, regular and risky consumption); school achievement (low, middle and high) and other academic performance indicators (WISC-R Information and Arithmetic subtests, school support activities and failed subjects and courses). Lastly, several cognitive functions were measured by the WISC-R Similarities, Block Design and Digit Symbol subtests, the Toulouse-Piéron test and the Stroop test. Logistic regression methods were used to compare both groups and a linear regression model was used to determine the influence of the family density of alcoholism. The following confounding variables were controlled for: age, gender, socio-economic status and family cohesion. RESULTS: Children of alcoholics' were twice as likely as controls to present subclinical symptoms and four times more likely than controls to have a definite diagnosis of any mental disorder. More specifically, COAs had a significantly higher risk than controls of attention deficit disorder/hyperactivity, depression, phobias, enuresis and tics. COAs also tended to have more symptoms of generalized anxiety disorder. COAs had worse results on all the cognitive tests used and their risk of low school achievement was nine times higher than that of controls. Family density of alcoholism was significantly related to several psychiatric disorders and to low academic and cognitive performance in these children. CONCLUSION: Children of alcoholics' whose parents are in contact with treatment centers in Spain constitute a target group for selective prevention, as they have a higher risk of different negative outcomes, which mainly include attention disorders and other cognitive deficits, depression and anxiety. 相似文献
995.
996.
A preoperative abdominal wall study was conducted using a multidetector scanner in 162 women who had undergone breast reconstruction with abdominal perforator flaps. A map of the abdominal perforator vessels dependent on the deep inferior epigastric artery was created. In the first 36 cases, anatomic dissection of all perforators was performed during surgery. The outcome was then compared with the radiologic findings. In the following 126 cases, the perforator vessel chosen preoperatively by the multidetector scanner was located and dissected directly.In the first 36 cases, an absolute correlation was observed between the radiologic information and intraoperative findings. In the following 126 cases, surgery time and the rate of postoperative complications decreased significantly.The multidetector scanner provides valuable preoperative information enabling identification of the most suitable perforator in view of its caliber, location, course, and anatomic relationships. Once located, we can proceed directly to its dissection during surgery, making it a faster and safer technique. 相似文献
997.
Judith Garcia-Aymerich Àlvar Agustí Joan A. Barberà José Belda Eva Farrero Antoni Ferrer Jaume Ferrer Juan B. Gáldiz Joaquim Gea Federico P. Gómez Eduard Monsó Josep Morera Josep Roca Jaume Sauleda Josep M. Antó 《Archivos de bronconeumologia》2009,45(3):133-142
A functional definition of chronic obstructive pulmonary disease (COPD) based on airflow limitation has largely dominated the field. However, a view has emerged that COPD involves a complex array of cellular, organic, functional, and clinical events, with a growing interest in disentangling the phenotypic heterogeneity of COPD. The present review is based on the opinion of the authors, who have extensive research experience in several aspects of COPD. The starting assumption of the review is that current knowledge on the pathophysiology and clinical features of COPD allows us to classify phenotypic information in terms of the following dimensions: respiratory symptoms and health status, acute exacerbations, lung function, structural changes, local and systemic inflammation, and systemic effects. Twenty-six phenotypic traits were identified and assigned to one of the 6 dimensions. For each dimension, a summary is provided of the best evidence on the relationships among phenotypic traits, in particular among those corresponding to different dimensions, and on the relationship between these traits and relevant events in the natural history of COPD. The information has been organized graphically into a phenotypic matrix where each cell representing a pair of phenotypic traits is linked to relevant references. The information provided has the potential to increase our understanding of the heterogeneity of COPD phenotypes and help us plan future studies on aspects that are as yet unexplored. 相似文献
998.
999.
1000.
Ramos-Casals M Brito-Zerón P Sisó A Vargas A Ros E Bove A Belenguer R Plaza J Benavent J Font J 《The Journal of rheumatology》2007,34(4):754-761
OBJECTIVE: To analyze the prevalence and clinical significance of associated metabolic alterations [dyslipidemia, diabetes mellitus (DM), and hyperuricemia] in a large series of unselected patients with primary Sj?gren's syndrome (SS). METHODS: We analyzed 254 consecutive patients with primary SS who had a complete analytical followup study for at least 5 consecutive years. The control group consisted of 254 age and sex-matched patients without systemic autoimmune diseases consecutively followed during the same period in a primary care center. RESULTS: In comparison with controls, patients with primary SS showed a higher frequency of dyslipidemia (47% vs 33%; p = 0.002), DM (28% vs 18%; p = 0.006), and hyperuricemia (9% vs 4%; p = 0.007). The mean age at SS diagnosis was 10 years greater in patients with DM (p < 0.001) and hyperuricemia (p = 0.009). Hypercholesterolemia was associated with a lower frequency of immunological markers such as anti-Ro/SSA antibodies (p = 0.001), anti-La/SSB antibodies (p = 0.005), low C3 (p = 0.047), and low C4 levels (p = 0.030), while hypertriglyceridemia and DM were associated with a higher prevalence of extraglandular features, especially renal, liver, and vasculitic involvement. A higher prevalence of DM was found in patients treated with corticosteroids (40% vs 19%; p = 0.001). CONCLUSION: Patients with primary SS showed a higher prevalence of associated dyslipidemia, DM, and hyperuricemia in comparison with an age and sex-matched control group. Metabolic alterations were associated with a differentiated pattern of clinical and immunological SS expression, but not with SS-related therapies (except for the higher frequency of DM observed in patients treated with corticosteroids). 相似文献