首页 | 本学科首页   官方微博 | 高级检索  
文章检索
  按 检索   检索词:      
出版年份:   被引次数:   他引次数: 提示:输入*表示无穷大
  收费全文   19355篇
  免费   1244篇
  国内免费   217篇
耳鼻咽喉   242篇
儿科学   665篇
妇产科学   458篇
基础医学   2575篇
口腔科学   249篇
临床医学   1586篇
内科学   3637篇
皮肤病学   343篇
神经病学   1383篇
特种医学   705篇
外国民族医学   1篇
外科学   2415篇
综合类   486篇
一般理论   23篇
预防医学   2993篇
眼科学   494篇
药学   1123篇
  2篇
中国医学   142篇
肿瘤学   1294篇
  2024年   73篇
  2023年   205篇
  2022年   363篇
  2021年   644篇
  2020年   309篇
  2019年   529篇
  2018年   631篇
  2017年   447篇
  2016年   472篇
  2015年   552篇
  2014年   724篇
  2013年   1040篇
  2012年   1474篇
  2011年   1524篇
  2010年   933篇
  2009年   742篇
  2008年   1106篇
  2007年   1196篇
  2006年   1120篇
  2005年   946篇
  2004年   900篇
  2003年   829篇
  2002年   716篇
  2001年   356篇
  2000年   303篇
  1999年   259篇
  1998年   130篇
  1997年   130篇
  1996年   98篇
  1995年   93篇
  1994年   92篇
  1993年   63篇
  1992年   155篇
  1991年   142篇
  1990年   164篇
  1989年   187篇
  1988年   157篇
  1987年   149篇
  1986年   129篇
  1985年   113篇
  1984年   80篇
  1983年   63篇
  1982年   35篇
  1981年   37篇
  1980年   29篇
  1979年   46篇
  1978年   22篇
  1975年   35篇
  1973年   23篇
  1972年   21篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
Introduction . Percutaneous closure of congenital ventricular septal defects (VSDs) represents a promising alternative to surgery with lower rate of complications and shorter hospital stay. Its main limitation is the choice of the appropriate device for each type of defect. Aim. To report the experience of the service of cardiology (Sahloul hospital, Sousse, Tunisia) in percutaneous closure of congenital VSDs with Amplatzer Duct Occluder II (ADOII). Methods. This was a retrospective, monocentric study, conducted from January 2013 to December 2017. The study included patients treated by percutaneous closure of congenital VSDs with the ADOII device. Results. Twelve patients (6 boys; 6 girls) were included. The mean±SD of patients’ age and weight were 65±41 months and 23±10 kg, respectively. VSDs were peri-membranous (n=9) and muscular (n=3), and defects were restrictive (n=11) and non-restrictive (n=1). The mean (minimum-maximum) size of VSDs was 4.72 (3-6) mm. Eleven ADOII prostheses were successfully implanted. One failure procedure was noted with migration of the device into the pulmonary artery. A second child with perimembranous defect developed transient atrioventricular block. No deaths occurred. Conclusion. The present early experience shows that percutaneous closure with ADOII device of perimembranous and trabecular VSDs is safe and effective.  相似文献   
92.
93.
Purpose Spinal metastases of lung cancer (SMLC) usually have high degree of malignancy and require surgical treatment. However, there are several controversies about the efficacy of surgery. This study aimed to investigate factors predicting prognosis of SMLC after surgery‐based comprehensive treatment.MethodsA cohort of 112 cases of SMLC who underwent surgical treatment between 2009 and 2020 were retrospectively reviewed and analyzed. The surgical strategies included total en‐bloc spondylectomy, debulking surgery, palliative decompression, and vertebral augmentation procedures. The patients were regularly followed‐up. Survival analysis was performed, as well as analysis of the patients'' neurological recovery, pain relief, and improvement of Karnosky performance score (KPS). Cox regression was used to analyze influencing factors of survival time, and Kaplan–Meier method was performed in survival analysis.ResultsThe cohort included 63 males and 49 females, with an average age of 60.6 ± 10.6 years. Median survival time was 16 months. A total of 86.7% of paralysis patients'' neurological function recovered and 83.9% of patients with low KPS score (10–40) improved. Surgical method was significantly correlated with improvement of neurological function (p < 0.001) and KPS (p < 0.001). The mean bleeding volume was 502 ml and operative time was 170 min. The survival rates at 3, 6, 12, 24, and 36 months were 92.0%, 80.4%, 63.4%, 63.4%, and 22.6%, respectively. Postoperative Frankel grade (p < 0.001), postoperative KPS score (p = 0.001), and application of molecular targeted drugs (p < 0.001) were significantly correlated with survival time in univariate analysis, while application of molecular targeted drugs was an independent predictor for a longer survival by a multivariate analysis.ConclusionSurgery‐based comprehensive treatment brought a fair outcome, with elongated survival time. Surgery can significantly improve patients'' neurological function and physical performance status. Adjuvant targeted therapy is an independent positive factor for patients'' survival.  相似文献   
94.
目的研究CT血管造影(CTA)在评价冠状动脉支架术后支架内再狭窄中的应用价值。方法40例冠状动脉支架术后患者(共82枚支架),分别接受16排CTA和常规冠状动脉造影(CAG)检查,并由两位有经验的医师独立对冠状动脉支架开通或再狭窄进行评估。结果CTA方法能评价所有82枚支架中的68枚(83%),其中支架直径≥3.0 mm者53枚(78%),支架壁厚度<140μm者51枚(75%);CAG显示有7枚支架发生再狭窄,CTA发现其中5枚;CAG和CTA对其余61枚支架均显示无再狭窄。在CTA不可评价的14枚支架中,支架直径<3.0 mm者13枚(93%),支架壁厚度≥140μm者13枚(93%)。CTA对冠状动脉支架术后再狭窄诊断的敏感性、特异性、阳性预测值和阴性预测值分别为71%、100%、97%和100%。结论16排CTA能较准确地评价冠状动脉支架术后支架内再狭窄的发生,尤其对大直径、薄金属壁支架的评估价值较高。  相似文献   
95.
96.
IntroductionPedagogical workshop planning is challenging especially when we aim to promote a reflective practice of the tutees. This practice has been widely discussed in the literature without a real consensus. Some authors reported oral exercises or anecdotes, other described writings or even storytelling. The aim of the authors was to describe the different steps performed by the tutors and to assess the tutees’ satisfaction.Material and methodsThis was a pilot study dealing with the use of the prospective strategy principles in order to plan a pedagogical workshop. Included participants were early academic teacher trainees.ResultsThe authors illustrated how they planned a pedagogical workshop using the prospective strategy and highlighted the satisfaction of the tutees.ConclusionProspective strategy is mainly used in economic field in order to change the future of the companies by acting on different intervening factors. Associating prospective strategy to pedagogical principles hasn’t been reported in the medical literature and seems to be available in order to induce reflective practice.  相似文献   
97.
98.
美国临床肿瘤学会(American Society of Clinical Oncology,ASCO)是全球领先的肿瘤专业学术组织,学会宗旨是预防癌症及改善癌症诊疗服务.肿瘤学实践技能改善活动(Quality Oncology Practice Initiative,QOPI)始于2002年,是在ASCO健康服务委员会的指导下,以临床实践为基础的医疗质量改善活动,其目标是帮助肿瘤科医师通过自我检查和改善,促进其诊疗水平的提高.  相似文献   
99.
Background: In surrogate pregnancies the genetic parents have little opportunity for early bonding to their infant, either prenatally (in utero) or in the immediate postnatal period. The purpose of this article is to describe a new method for encouraging early parent‐infant bonding after surrogate pregnancy by hospitalizing the genetic mother in the maternity ward immediately after the delivery. Methods: Two genetic mothers were hospitalized in the maternity ward (rooming‐in system) at the Rabin Medical Center in Israel immediately after delivery of their infants by surrogate arrangement. The first birth was a singleton pregnancy with vaginal delivery and the second, a twin pregnancy with delivery by cesarean section. The genetic parents were counseled by a social worker from the adoption agency, starting 3 months before the estimated date of delivery. The parents were referred to the hospital social worker before the delivery. To assess attachment, we observed the parents' behavior toward their children during two daily 15‐minute periods of free, unstructured interaction. Results: The parents showed good primary caregiving functions and established affective verbal and physical contact with the infants. They began to recognize the infants' needs and temperament, and exhibited an aura of self‐confidence during their interactions. All expressed satisfaction with the method at discharge and reported on reduction of their fears about returning home with the infants. Conclusions: We believe that early hospitalization of the genetic mother in a surrogate delivery may be desirable to establish good and safe early mother‐infant bonding, and that it should be considered for adoption as regular hospital policy. Further randomized studies with larger samples over the long term are warranted.  相似文献   
100.
A case is reported in which ventricular tachycardia was followed by cardiac standstill; the cause of death was coronary artery disease. This is in support of the contention of Grieco and Schwartz that cardiac standstill should occur as frequently as ventricular fibrillation, and that, if more records could be obtained, additional instances of cardiac standstill would probably be discovered.A second case, in which ventricular fibrillation occurred during the period of terminal cardiac activity, is added to the five such cases which have been previously reported by others.  相似文献   
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号