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   41175篇
  免费   2230篇
  国内免费   146篇
耳鼻咽喉   535篇
儿科学   2634篇
妇产科学   724篇
基础医学   4916篇
口腔科学   1158篇
临床医学   2962篇
内科学   7326篇
皮肤病学   1133篇
神经病学   2552篇
特种医学   1195篇
外科学   6100篇
综合类   1297篇
一般理论   17篇
预防医学   2085篇
眼科学   1604篇
药学   4165篇
  1篇
中国医学   353篇
肿瘤学   2794篇
  2023年   333篇
  2022年   1018篇
  2021年   1673篇
  2020年   918篇
  2019年   1016篇
  2018年   1442篇
  2017年   1027篇
  2016年   1366篇
  2015年   1380篇
  2014年   2028篇
  2013年   2306篇
  2012年   3280篇
  2011年   3172篇
  2010年   1912篇
  2009年   1507篇
  2008年   2129篇
  2007年   2139篇
  2006年   1968篇
  2005年   1733篇
  2004年   1625篇
  2003年   1359篇
  2002年   1162篇
  2001年   788篇
  2000年   722篇
  1999年   594篇
  1998年   271篇
  1997年   217篇
  1996年   224篇
  1995年   193篇
  1994年   160篇
  1993年   133篇
  1992年   350篇
  1991年   338篇
  1990年   359篇
  1989年   333篇
  1988年   286篇
  1987年   241篇
  1986年   236篇
  1985年   231篇
  1984年   175篇
  1983年   124篇
  1982年   69篇
  1981年   75篇
  1980年   73篇
  1979年   109篇
  1978年   74篇
  1977年   88篇
  1976年   65篇
  1973年   63篇
  1971年   60篇
排序方式: 共有10000条查询结果,搜索用时 885 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