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   3899篇
  免费   157篇
  国内免费   155篇
耳鼻咽喉   58篇
儿科学   60篇
妇产科学   26篇
基础医学   181篇
口腔科学   58篇
临床医学   206篇
内科学   646篇
皮肤病学   7篇
神经病学   93篇
特种医学   94篇
外国民族医学   1篇
外科学   1666篇
综合类   556篇
现状与发展   1篇
预防医学   73篇
眼科学   95篇
药学   119篇
  5篇
中国医学   21篇
肿瘤学   245篇
  2024年   5篇
  2023年   54篇
  2022年   86篇
  2021年   109篇
  2020年   97篇
  2019年   119篇
  2018年   104篇
  2017年   91篇
  2016年   105篇
  2015年   98篇
  2014年   218篇
  2013年   260篇
  2012年   178篇
  2011年   198篇
  2010年   157篇
  2009年   180篇
  2008年   226篇
  2007年   207篇
  2006年   158篇
  2005年   175篇
  2004年   158篇
  2003年   146篇
  2002年   135篇
  2001年   104篇
  2000年   83篇
  1999年   96篇
  1998年   76篇
  1997年   54篇
  1996年   48篇
  1995年   59篇
  1994年   46篇
  1993年   27篇
  1992年   29篇
  1991年   23篇
  1990年   30篇
  1989年   29篇
  1988年   29篇
  1987年   30篇
  1986年   33篇
  1985年   31篇
  1984年   32篇
  1983年   13篇
  1982年   18篇
  1981年   12篇
  1980年   12篇
  1979年   12篇
  1978年   7篇
  1977年   4篇
  1976年   5篇
  1975年   2篇
排序方式: 共有4211条查询结果,搜索用时 15 毫秒
1.
BackgroundStoma-related obstruction (SRO) is defined as small bowel obstruction occurring around the limbs of diverting ileostomy (DI). This study was aimed to investigate the incidence, risk factors, and management of SRO after laparoscopic colorectal surgery with DI creation.MethodsThis study included 155 patients who underwent laparoscopic colorectal surgery with DI creation for rectal cancer (n = 138), ulcerative colitis (UC) (n = 14), and familial adenomatous polyposis (FAP) (n = 3) between 2011 and 2019. Univariate and multivariate analyses were performed to identify the risk factors of SRO.ResultsThe incidence of SRO was 7.7% (n = 12), and it was significantly lower (P < 0.01) in patients with lower anterior resection or intersphincteric resection (4.3%) than in those with ileal-pouch anal anastomosis (IPAA) (35.2%). The multivariate analysis revealed that IPAA was independently associated with the development of SRO (P = 0.001; odds ratio, 9.4; 95% confidence interval, 2.5–35.4). Eleven of 12 patients (92%) with SRO required trans-stomal tube decompression, and 8 of those (67%) underwent early stoma closure.ConclusionIPAA was an independent risk factor of SRO in laparoscopic colorectal surgery with DI creation. Early stoma closure was needed in most cases of SRO.  相似文献   
2.
PurposeTo retrospectively evaluate the safety and effectiveness of the Covera stent graft (SG) for the treatment of dysfunctional or thrombosed arteriovenous grafts (AVGs).Materials and MethodsWithin 29 months (February 2016–August 2018), 79 patients underwent Covera SG placement in the authors’ department for the treatment of dysfunctional AVGs. Data were available for 64 patients who underwent 64 procedures, using 64 devices. Minimum follow-up was 6 months, unless reintervention occurred. Mean follow-up was 277 days (6–923 days). Treatment characteristics were 51 cases with venous-graft anastomosis (VGA) stenosis (79.7%), 13 cases of puncture zone stenosis (20.3%), 14 cases of in SG stenosis (21.9%), 8 cases of pseudoaneurysm treatment (12.5%) (1 treatment area might have had more than 1 characteristic). Thirty-six patients presented with thrombosis (56.2%), and 31 of 64 case were de novo treatment areas (48.4%). Primary outcome measurements were technical success and post-intervention primary patency (PIPP) at 6 months, whereas secondary outcome measurements included factors influencing primary outcome.ResultsTechnical success was 100%. Median PIPP was 336 days, and 73.6% of treatment areas were patent at 6 months. There were no significant differences in terms of PIPP when de novo treatment areas were compared with restenotic areas (519 vs. 320 days, respectively; P = .1); patients who presented with versus those who presented without thrombosis (320 vs. 583 days, respectively; P = .07); puncture zone stenosis or elsewhere (329 vs. 686 days, respectively; P = .52); and VGA stenosis or elsewhere (336 vs. 335 days, respectively; P = .9).ConclusionsUse of the Covera SG for AVG treatment was safe and effective in every type of treatment area presented in this retrospective analysis.  相似文献   
3.
4.
5.
上下泪小管同时断裂35例手术分析   总被引:2,自引:1,他引:1  
目的探讨上、下泪小管同时断裂的手术治疗方法。方法上、下泪小管同时断裂共35例,按手术方式分为两组。A组:27例同时行上、下泪小管吻合术;B组:8例仅行下泪小管吻合术。结果A组27例较少发生内眦角变形、睑外翻,上下泪点复位良好。结论为求上、下泪小管断裂术后能达到解剖复位及功能复位,同时行上、下泪小管断裂吻合效果较好。  相似文献   
6.
Esophageus or gaster resection in patients with malignant disease is still a treatment of choice. It is obvious that each surgical procedure in these patients carries some possibility of complications. Esophageo-gastric or esophageo-jejuno anastomosis has a 4-27% frequency of fistula occurrence. All these result in 65% mortality in cases of poorer prognosis. The aim of this paper is not to present all types of complications but to objectively analyse the usefulness of the covered stent placement in the treatment of anastomotic fistulas. We present six patients who were treated for postoperative fistula of esophageo-gastric anastomosis (1 case) or esophageo-jejuno anastomosis (5 cases). All patients were treated with stapler suture for digestive tract reconstruction after malignancy removal during the primary surgical procedure. Signs and symptoms of suture leak between 5-8 days post-surgery were observed. Conservative therapy was not effective. Thus a new method of treatment was employed - covered stent placement. The procedure was performed under X-ray control. In all treated patients there was change for the better and quick reduction of secretion from the fistulas was observed. All patients were discharged from the department after several days and all had survived at 30 days follow-up. Covered esophageal stent placement seems to be a safe and promising method of treatment for patients with anastomotic fistula which significantly reduces mortality and improves quality of live. Our experiences confirms that of other investigators.  相似文献   
7.
Quality of life after total mesorectal excision for rectal cancer   总被引:3,自引:0,他引:3  
BACKGROUND: After total mesorectal excision for rectal cancer, many surgeons try to avoid an abdominoperineal resection (APR) by performing a transanally double stapled low colo-rectal anastomosis (LRA), frequently without a pouch. This policy is mainly based on the assumption that the quality of life after such LRA is higher than after APR. It has been suggested that a better functional outcome and therefore a higher quality of life might be achieved by a colo-anal J-pouch anastomosis (CPA). The aim of this study was to assess quality of life among disease-free survivors after APR, LRA and CPA. METHODS: The charts of 301 consecutive patients who had undergone surgery for cancer in the middle or lower third of the rectum were analysed. Two hundred four patients were eligible for inclusion. The quality of life among these patients was assessed using one generic (EQ-5D) and two disease-specific questionnaires (EORTC QLQ-C30 and EORTC QLQ-CR38). RESULTS: The response rate was 82%. The median follow-up was 31 months. Overall, quality of life was good but CPA patients had better quality of life scores than APR and LRA patients. This difference was not only due to the better functional outcome but also to the lower incidence of disturbed micturition and sexual problems in the CPA group. CONCLUSION: The quality of life after colo-anal J-pouch anastomosis is better than after abdominoperineal resection (APR) and low colo-rectal anastomosis (LRA). The quality of life after APR is similar to that after LRA.  相似文献   
8.
周围神经端侧动脉套接后神经再生的研究   总被引:6,自引:2,他引:4  
目的研究周围神经端侧动脉套接后神经再生的可能性及其特点. 方法取SD大鼠75只,在股骨中下段切断腓神经,将近断端逆转90度包埋于肌肉中.随机分为5组.A组:将截取的左颈总动脉套接于右侧正常胫神经侧方与腓总神经远端2 mm距离之间,缝合部胫神经外膜不予切除;B组:在胫神经套接部外膜开窗1.0 mm;C组:腓总神经切断14天后再予动脉套接,余同B组;D组:同B组,且于动脉套接部注入神经生长因子(neural growth factor, NGF)1 ml;E组:将腓总神经远端以端侧缝合形式直接缝合于胫神经的一侧,外膜开窗1.0 mm.术后4、8和12周分别行组织学、电镜和神经纤维计数等检查. 结果 4周时C、D及E组周边区域有神经纤维轴突和髓鞘再生,A组则无神经纤维生长; 8周时C、D及E组再生神经纤维较B组多,E组神经纤维较C、D组多,差异有统计学意义(P<0.05); 12周时C、D及E组神经纤维多于B组,差异有统计学意义(P<0.05);C组及D组有较丰富的神经再生,与神经端侧直接吻合的E组差异无统计学意义(P>0.05). 结论神经端侧2 mm距离动脉套接可作为修复周围神经损伤的一种可行方法.  相似文献   
9.
对17例人工绝育后曾行输卵管复通手术失败病例,进行再次显微输卵管复通手术,经随访二年以上,宫内妊娠率41.18%(7/17)。手术后成功率与输卵管吻合部位有关,峡部与壶腹部吻合效果最差。作者指出再次显微输卵管吻合手术对由于原吻合部位闭锁病例有一定的价值。但需慎重考虑如何提高初次吻合术质量、防止术后粘连是十分重要。  相似文献   
10.
目的:探讨和研究治疗晚期面瘫的手术治疗,总结应用以足底内侧动静脉为蒂的(足母)展肌游离移植一期修复晚期面瘫40例效果和经验.方法:选取(足母)展肌为供肌,以足底内侧动静脉及其延续的胫后动静脉为血管蒂,以支配(足母)展肌神经及其延续的足底内侧神经和胫神经为神经蒂.(足母)展肌移植于患侧面部皮下,肌近断固定于口角,远端固定于耳前颧弓,血管神经蒂通过上唇皮下隧道与健侧面动静脉和面神经颊支吻合.结果:经随访一年以上,23例恢复了面部静态对称和理想的下面部随意和不随意运动;8例恢复了面部静态对称和部分下面部随意和不随意运动;9例仅恢复了面部静态对称.结论:(足母)展肌游离移植一期修复晚期面瘫具有疗效好、手术操作简便、肌肉大小适中、血管神经蒂走行位置恒定紧密伴行、血管神经蒂可切取较长、变跨面神经移植和肌肉移植的两期移植为一期移植等优点;而且,神经是血管化移植.  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