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   957篇
  免费   56篇
  国内免费   4篇
耳鼻咽喉   4篇
儿科学   20篇
妇产科学   20篇
基础医学   121篇
口腔科学   55篇
临床医学   78篇
内科学   251篇
皮肤病学   9篇
神经病学   25篇
特种医学   12篇
外科学   105篇
综合类   28篇
一般理论   1篇
预防医学   73篇
眼科学   45篇
药学   52篇
中国医学   2篇
肿瘤学   116篇
  2023年   5篇
  2022年   15篇
  2021年   37篇
  2020年   31篇
  2019年   28篇
  2018年   28篇
  2017年   15篇
  2016年   23篇
  2015年   26篇
  2014年   46篇
  2013年   57篇
  2012年   94篇
  2011年   76篇
  2010年   46篇
  2009年   32篇
  2008年   54篇
  2007年   50篇
  2006年   68篇
  2005年   45篇
  2004年   35篇
  2003年   38篇
  2002年   30篇
  2001年   16篇
  2000年   8篇
  1999年   10篇
  1998年   5篇
  1997年   4篇
  1996年   2篇
  1995年   4篇
  1994年   7篇
  1993年   3篇
  1992年   5篇
  1991年   4篇
  1990年   5篇
  1989年   7篇
  1988年   3篇
  1987年   6篇
  1985年   4篇
  1984年   3篇
  1981年   3篇
  1980年   5篇
  1977年   2篇
  1975年   3篇
  1974年   2篇
  1973年   2篇
  1970年   2篇
  1969年   2篇
  1933年   3篇
  1930年   4篇
  1929年   5篇
排序方式: 共有1017条查询结果,搜索用时 218 毫秒
1.
2.
Background Extended trans septal (ETS) approach for mitral valve surgery often divides the artery to the Sino-Atrial node. The clinical implication of this is contentious. We analyzed our early results with ETS approach. Methods Between June 1998 and September 2003 eleven patients underwent mitral valve surgery by ETS approach. Six were females. Age ranged from 19 years to 67 years (median 40 years). Six underwent mitral valve replacement (MVR). Four underwent aortic and mitral (double) valve replacement (DVR). One had mitral valve repair. Three had additional procedures (tricuspid valve repair=1, Coronary artery bypass=1, Aorto bifemoral graft=1). Cardiopulmonary bypass ranged from 64 minutes to 77 minutes (median 72 minutes) for MVR and 112 minutes to 178 minutes (median 140 minutes) for DVR. Aortic cross clamp times ranged from 39 minutes to 52 minutes (median 47 minutes) for MVR and 74 minutes to 120 minutes (median 95 minutes) for DVR. Results There was no mortality or morbidity attributed to the ETS approach. One early death in emergency DVR was due to heart failure. Three patients needed seqeuntial pacing in the immediate post-operative period. Nine out of ten survivors were back to their preoperative rhythms on hospital discharge (6 sinus rhythm; 3 atrial fibrillation). One patient with preoperative trifascicular block who underwent reoperation to fix a paravalvular mitral leak needed a permanent pacemaker (VVI). The follow-up ranged from 1 month to 64 months (median 6 months) and is 100% complete. There was no late death or new arrhythmia. Conclusions Extended trans septal approach is safe. It gives excellent exposure of the mitral valve. division of the sinus node artery is not deleterious in the short to intermediate term. Presented at the 50th Annual Meeting of IACTS. New Delhi, Feb. 2004.  相似文献   
3.
目的:鉴定现行的治疗方法并评价其对子宫内膜增生妇女的治疗效果。研究设计:研究1998年10月至2000年9月期间所有在伯明翰妇女医院,经组织学诊断为子宫内膜增生的妇女。应用标准化资料提取表对每一位妇女进行回顾性病例研究,基线特征包括临床表现和治疗方案。应用治疗后子宫内膜组织的检查结果来评价治疗方法的组织学反应,用是否需要子宫切除术及其指征来评价临床反应。结果:在研究期间有351例妇女被诊断为子宫内膜增生,其中84%表现出异常子宫出血的症状且54%的患者已绝经。合并子宫内膜增生是最常见的诊断,占所有病例的60%。无细胞学非典型…  相似文献   
4.
5.
6.
7.
IntroductionLatarjet procedure is commonly performed for recurrent anterior shoulder instability with glenoid side bone loss. Classic Latarjet procedure can be performed using specially designed drill guides, jigs, or by freehand technique. Here we have described a technical note on classic Latarjet procedure performed with freehand technique utilizing simple rulers and caliper. The functional and radiological outcomes of our patients have also been analysed.Material and Methods149 open classic Latarjet procedures were performed using our technique between March 2015 and July 2018. The mean age of the patients was 32.95 years (Range 22–59 years). The functional outcome of the patients was measured using Western Ontario Shoulder Instability (WOSI) and Oxford Shoulder Instability Score (OSIS) at 2 years of follow-up. Screw and graft positioning were studied in 24 consecutive patients with a postoperative computed tomography (CT) scan.ResultsThere was no incidence of recurrent subluxation or dislocation post-surgery. Mean OSIS score increased from 15.63 ± 3.20 preoperatively to 42.44 ± 3.88 postoperatively (p value < 0.05). WOSI score decreased significantly from 62.54% ± 8.24 to 10.26 ± 6.33 postoperatively at 2-year follow-up (p value < 0.05). Postoperative CT scan also showed satisfactory screw placement in all patients.ConclusionOpen Latarjet procedure performed using freehand technique provides good functional and radiological outcomes in patients with recurrent anterior shoulder instability with glenoid side bone loss.Supplementary InformationThe online version contains supplementary material available at 10.1007/s43465-021-00385-7.  相似文献   
8.
In the context of declining economic growth, now exacerbated by the coronavirus disease 2019 pandemic, Papua New Guinea is increasing the efficiency of its health systems to overcome difficulties in reaching global health and development targets. Before 2015, the national health information system was fragmented, underfunded, of limited utility and accessed infrequently by health authorities. We built an electronic system that integrated mobile technologies and geographic information system data sets of every house, village and health facility in the country. We piloted the system in 184 health facilities across five provinces between 2015 and 2016. By the end of 2020, the system’s mobile tablets were rolled out to 473 facilities in 13 provinces, while the online platform was available in health authorities of all 22 provinces, including church health services. Fractured data siloes of legacy health programmes have been integrated and a platform for civil registration systems established. We discuss how mobile technologies and geographic information systems have transformed health information systems in Papua New Guinea over the past 6 years by increasing the timeliness, completeness, quality, accessibility, flexibility, acceptability and utility of national health data. To achieve this transformation, we highlight the importance of considering the benefits of mobile tools and using rich geographic information systems data sets for health workers in primary care in addition to the needs of public health authorities.  相似文献   
9.
This study aims to assess trends in compliance with current colposcopy guidelines in 10 gynaecological units in four English counties since 1996; to identify constraints on compliance and suggest change in practice. All 10 gynaecology units in Oxfordshire, Buckinghamshire, Northamptonshire and Berkshire participated. Data were collected prospectively by colposcopists from 23,500 new referrals across a 55-month period from September 1996 to March 2001. The Oxford Cancer Intelligence Unit performed collation, quality assurance and retrieval of data for incomplete records. Audit results were disseminated annually to colposcopists via the Regional Colposcopy Group. Colposcopy waiting times exceeded the standards, but waiting times for high-grade referrals showed statistically significant improvement. Six standards were achieved; relating to accuracy, appropriateness of management and outcomes. The seven unmet standards relate to waiting times, colposcopist's caseload, follow-up policy and the proportion of cervical epithelial neoplasia (CIN) on histology. Changes in practice are suggested, constraints on compliance are identified and the appropriateness of some guidelines is questioned.  相似文献   
10.
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