全文获取类型
收费全文 | 5824篇 |
免费 | 504篇 |
国内免费 | 26篇 |
专业分类
耳鼻咽喉 | 72篇 |
儿科学 | 207篇 |
妇产科学 | 137篇 |
基础医学 | 636篇 |
口腔科学 | 142篇 |
临床医学 | 692篇 |
内科学 | 1065篇 |
皮肤病学 | 62篇 |
神经病学 | 574篇 |
特种医学 | 202篇 |
外科学 | 888篇 |
综合类 | 123篇 |
一般理论 | 2篇 |
预防医学 | 726篇 |
眼科学 | 147篇 |
药学 | 329篇 |
中国医学 | 7篇 |
肿瘤学 | 343篇 |
出版年
2023年 | 53篇 |
2022年 | 79篇 |
2021年 | 223篇 |
2020年 | 96篇 |
2019年 | 161篇 |
2018年 | 190篇 |
2017年 | 129篇 |
2016年 | 124篇 |
2015年 | 165篇 |
2014年 | 190篇 |
2013年 | 257篇 |
2012年 | 324篇 |
2011年 | 326篇 |
2010年 | 165篇 |
2009年 | 179篇 |
2008年 | 269篇 |
2007年 | 265篇 |
2006年 | 217篇 |
2005年 | 225篇 |
2004年 | 221篇 |
2003年 | 187篇 |
2002年 | 153篇 |
2001年 | 134篇 |
2000年 | 162篇 |
1999年 | 120篇 |
1998年 | 78篇 |
1997年 | 55篇 |
1996年 | 63篇 |
1995年 | 45篇 |
1994年 | 64篇 |
1993年 | 41篇 |
1992年 | 85篇 |
1991年 | 93篇 |
1990年 | 81篇 |
1989年 | 78篇 |
1988年 | 86篇 |
1987年 | 64篇 |
1986年 | 75篇 |
1985年 | 58篇 |
1984年 | 57篇 |
1983年 | 57篇 |
1982年 | 53篇 |
1981年 | 36篇 |
1980年 | 36篇 |
1979年 | 57篇 |
1978年 | 53篇 |
1974年 | 28篇 |
1973年 | 32篇 |
1972年 | 27篇 |
1970年 | 29篇 |
排序方式: 共有6354条查询结果,搜索用时 15 毫秒
1.
Paul J. Devlin Brian W. McCrindle James K. Kirklin Eugene H. Blackstone William M. DeCampli Christopher A. Caldarone Ali Dodge-Khatami Pirooz Eghtesady James M. Meza Peter J. Gruber Kristine J. Guleserian Bahaaladin Alsoufi Linda M. Lambert James E. OBrien Erle H. Austin Jeffrey P. Jacobs Tara Karamlou 《The Journal of thoracic and cardiovascular surgery》2019,157(2):684-695.e8
Objective
Arch obstruction after the Norwood procedure is common and contributes to mortality. We determined the prevalence, associated factors, and practice variability of arch reintervention and assessed whether arch reintervention is associated with mortality.Methods
From 2005 to 2017, 593 neonates in the Congenital Heart Surgeons' Society Critical Left Heart Obstruction cohort underwent a Norwood procedure. Median follow-up was 3.7 years. Multivariable parametric models, including a modulated renewal analysis, were performed.Results
Of the 593 neonates, 146 (25%) underwent 218 reinterventions for arch obstruction after the Norwood procedure: catheter-based (n = 168) or surgical (n = 50) at a median age of 4.3 months (quartile 1-quartile 3, 2.6-5.7). Interdigitation of the distal aortic anastomosis was protective against arch reintervention. Development of ≥ moderate tricuspid valve regurgitation and right ventricular dysfunction at any point was associated with arch reintervention. Nonsignificant variables for arch reintervention included shunt type and preoperative aortic measurements. Surgical arch reintervention was protective against arch reintervention, but transcatheter reintervention was associated with increased reintervention. Arch reintervention was not associated with increased mortality. There was wide institutional variation in incidence of arch reintervention (range, 0-40 reinterventions per 100 years patient follow-up) and in preintervention gradient (range, 0-64 mm Hg).Conclusions
Interdigitation of the distal aortic anastomosis during the Norwood procedure decreased the risk of arch reintervention. Surgical arch reintervention is more definitive than transcatheter. Arch reintervention after the Norwood procedure is not associated with increased mortality. Serial surveillance for arch obstruction, integrated with changes in right ventricular function and tricuspid valve regurgitation, is recommended after the Norwood procedure to improve outcomes. 相似文献2.
3.
SH Lee† CP Choi‡ HC Eun† OS Kwon† 《Journal of the European Academy of Dermatology and Venereology》2006,20(7):860-863
BACKGROUND: On December 26, 2004, the biggest earthquake for 40 years, measuring 9.0 on the Richter scale, triggered a tsunami that pounded the coastal areas of South Asia and East Africa. The effects of the tsunami on skin conditions have not been evaluated. OBJECTIVE: To determine the influence of the tsunami on skin conditions by evaluating the skin problems of patients presenting at hospitals after the tsunami. METHODS: Between 5 and 25 January 2005, two dermatologists evaluated patients who complained of skin problems at an outpatient clinic and emergency room of a general hospital in Banda Aceh, Aceh Province, Indonesia. RESULTS: The total number of patients that presented during the study period was 235 (131 males and 104 females), and they had a total of 265 skin problems. In terms of age distribution, most subjects were in their fourth decade (23.0%), followed by the third (22.6%) and fifth decade (16.6%). The most prevalent skin problems were infections-infestations (32.5%), followed by eczemas (29.8%) and traumatic skin disorders (29.4%). In males, traumatic skin disorders were most common. The great majority of infection-infestation cases involved superficial fungal infections. Contact dermatitis accounted for three-quarters of eczema cases, and mainly involved the arms (40.0%) and legs (27.1%). The majority of traumatic skin disorders were lacerations, punctures and penetrations, and the feet (44.7%) and hands (18.8%) were most frequently affected. CONCLUSIONS: Unhygienic conditions, exposure to a hazardous environment and contact with various objects during and after the tsunami probably increased the prevalence of infections-infestations, traumatic skin disorders and contact dermatitis. To prevent these problems and associated secondary bacterial infections, health-related education and early medical management are required. 相似文献
4.
5.
6.
Dopaminergic involvement in locomotion elicited from the ventral pallidum/substantia innominata 总被引:1,自引:0,他引:1
Microinjection of the indirect GABAA antagonist, picrotoxin, or the mu opioid agonist, Tyr-D-Ala-Gly-NMe-Phe-Gly-ol (DAGO), into the ventral pallidum and substantia innominata (VP/SI) increases locomotor activity in rats. The VP/SI has direct and indirect projections to the region of the ventral mesencephalon containing dopamine perikarya, and to certain dopamine terminal fields, including the nucleus accumbens. Thus, it is possible that modulation of the mesocorticolimbic dopamine system by pharmacological stimulation in the VP/SI may play a role in the locomotor stimulant response. It was shown that pretreatment with dopamine receptor antagonists, either peripherally or microinjected into the nucleus accumbens significantly attenuated the motor stimulant effect of DAGO or picrotoxin injection into the VP/SI. Injection of either picrotoxin or DAGO into the VP/SI increased the levels of dopamine metabolites in the nucleus accumbens and prefrontal cortex. Thus, the motor stimulant response following pharmacological stimulation of the VP/SI appears to be mediated by increased dopamine neurotransmission via feedback mechanisms to the mesocorticolimbic dopamine system. 相似文献
7.
8.
9.
10.
Olfactory Neuroblastoma and Neuroendocrine Carcinoma of the Anterior Skull Base: Treatment Results at the M.D. Anderson Cancer Center 下载免费PDF全文
John R. Austin Hazel Cebrun Mathew M. Kershisnik Adel K. El-Naggar Adam S. Garden Franco DeMonte Lawrence E. Ginsberg Scott M. Lippman Helmuth Goepfert 《Skull base》1996,6(1):1-8
Updated information on the pathologic characterization and treatment of olfactory neurobiastoma (ON) and neuroendocrine carcinoma (NEC) diseases is presented. A series of patients with ON or NEC was evaluated and retrospectively staged using the UCLA system. The parameters evaluated were symptoms, age, sex, risk factor assessment, stage of disease, treatment, and clinical outcome. The median follow-up was 3 years (range, 18 months to 23 years). The predominant therapy (63%) for ON was combined surgery and radiotherapy. Surgery alone or in combination with ancillary treatment was used in 58% of patients with NEC. For the most receat years of the study, patients with NEC have been treated successfully with combined chemotherapy and radiotherapy. Seventy percent of the patients with ON and 75% of the patients with NEC were clinically free of disease during the defined follow-up period. Surgical therapy consisting of a craniofacial resection combined with postoperative radiotherapy has resulted in good local and long-term control of ON. Our experience indicates that combined chemoradiation is an appropriate therapeutic approach for NEC. 相似文献