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   39957篇
  免费   2192篇
  国内免费   160篇
耳鼻咽喉   521篇
儿科学   2603篇
妇产科学   700篇
基础医学   4771篇
口腔科学   1146篇
临床医学   2862篇
内科学   7153篇
皮肤病学   1143篇
神经病学   2354篇
特种医学   1390篇
外科学   5953篇
综合类   1304篇
一般理论   17篇
预防医学   2034篇
眼科学   1379篇
药学   3989篇
中国医学   349篇
肿瘤学   2641篇
  2023年   283篇
  2022年   741篇
  2021年   1597篇
  2020年   878篇
  2019年   969篇
  2018年   1376篇
  2017年   1005篇
  2016年   1328篇
  2015年   1330篇
  2014年   1964篇
  2013年   2221篇
  2012年   3107篇
  2011年   3028篇
  2010年   1834篇
  2009年   1447篇
  2008年   2048篇
  2007年   2064篇
  2006年   1884篇
  2005年   1665篇
  2004年   1555篇
  2003年   1319篇
  2002年   1127篇
  2001年   783篇
  2000年   714篇
  1999年   600篇
  1998年   302篇
  1997年   256篇
  1996年   258篇
  1995年   219篇
  1994年   177篇
  1993年   161篇
  1992年   368篇
  1991年   352篇
  1990年   370篇
  1989年   352篇
  1988年   313篇
  1987年   285篇
  1986年   259篇
  1985年   243篇
  1984年   182篇
  1983年   134篇
  1982年   82篇
  1981年   95篇
  1980年   86篇
  1979年   117篇
  1978年   77篇
  1977年   96篇
  1976年   86篇
  1975年   66篇
  1973年   63篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
61.
62.
63.
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   
64.
65.
66.
67.
68.
Defects involving the distal leg and foot are frequently encountered following various aetiological factors. Paucity of local tissue causes surgeons to resort to the retrograde peninsular flap, the cross leg flap or the free flap. With specific knowledge of perforators, the fasciocutaneous flap from the calf area can be transferred to the defect in a single stage based on skeletonised distal perforators. The surgical anatomy, flap planning and procedure have been detailed. Nineteen patients were treated during the period 1995 to 2005. The perforators were identified preoperatively by audio Doppler. The flaps were marked and dissected proximal to the defect skeletonising the distal perforators under loupe magnification and transferred to the defect in a single stage. The donor site was skin grafted. Out of 19 cases, 16 flaps healed uneventfully, one flap necrosed completely and in two cases there was marginal necrosis. The cases were followed up for 2-10 years with an average of 6 years. With detailed knowledge of perforators one can safely reconstruct distal moderate-size defects of the lower limb in a single stage, thus having the benefits of free tissue transfer without resorting to microsurgery. This technique has proved to be an advancement in the reconstructive repertoire allowing flaps of non conventional dimensions to be perfused by skeletonised perforators.  相似文献   
69.
The treatment of Legg-Calvé-Perthes disease remains controversial. The aim of this survey was to ascertain the current management strategies of this condition amongst UK paediatric orthopaedic surgeons, with particular regard to containment procedures in the fragmentation phase. Questionnaires were distributed at the January 2006 meeting of the British Society for Children’s Orthopaedic Surgery (BSCOS) and was posted to all absent members. The results showed a great deal of variability not only in the treatment of Perthes disease, but also in the decision-making processes. Consideration must now be given to a carefully constructed national multi-centre prospective randomised controlled study into the optimum management of this disease  相似文献   
70.
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