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   1067篇
  免费   52篇
  国内免费   15篇
儿科学   35篇
妇产科学   38篇
基础医学   20篇
临床医学   85篇
内科学   172篇
皮肤病学   28篇
神经病学   1篇
特种医学   13篇
外科学   311篇
综合类   167篇
预防医学   105篇
药学   97篇
中国医学   55篇
肿瘤学   7篇
  2024年   1篇
  2023年   17篇
  2022年   25篇
  2021年   27篇
  2020年   30篇
  2019年   30篇
  2018年   26篇
  2017年   26篇
  2016年   43篇
  2015年   42篇
  2014年   97篇
  2013年   108篇
  2012年   70篇
  2011年   86篇
  2010年   71篇
  2009年   71篇
  2008年   60篇
  2007年   51篇
  2006年   54篇
  2005年   46篇
  2004年   35篇
  2003年   24篇
  2002年   19篇
  2001年   19篇
  2000年   8篇
  1999年   8篇
  1998年   4篇
  1997年   3篇
  1996年   2篇
  1995年   3篇
  1994年   3篇
  1992年   1篇
  1989年   2篇
  1987年   3篇
  1986年   3篇
  1985年   6篇
  1984年   1篇
  1983年   1篇
  1982年   3篇
  1981年   2篇
  1976年   1篇
  1972年   2篇
排序方式: 共有1134条查询结果,搜索用时 31 毫秒
1.
目的:探讨采用吻合器经肛管引流治疗重度痔降低术后并发症的影响。方法:随机将101例Ⅲ~Ⅳ期混合痔及内痔患者分为引流组48例和非引流组53例,回顾性分析两组施行PPH经肛引流及非引流术后的临床资料。结果:两组间数据比较伤口渗血(12h~48h)、排便异常指标,对照显示差异显著(P〈0.05)。结论:该术式具有安全、有效、术时短、恢复快及术后并发症明显降低等优点。  相似文献   
2.
保留齿线悬吊术治疗环状混合痔   总被引:13,自引:1,他引:12  
目的:探讨保留齿线悬吊术治疗环状混合痔的临床应用价值.方法:72例环状混合痔病人连续进入观察.随机分为两组:保留齿线悬吊术组(即治疗组36例)和外剥内扎法组(即对照组36例).根据治愈率、治愈时间及安全性方面的结果作评价.结果:保留齿线悬吊术组治愈率(88.89%)与对照组(83.33%)相比无显著性差异.治愈时间(18.42±4.67) d VS(22.11±6.01) d,两组有显著性差异;通过测定肛管直肠压力,显示两组手术均较安全.结论:保留齿线悬吊术治疗环状混合痔与外剥内扎术相比,明显缩短术后伤口愈合时间.  相似文献   
3.
Stapled hemorrhoidopexy is widely accepted to treat hemorrhoids, but serious complications have been reported. In this prospective audit, we correlated clinical outcome with pathological findings. From January 2003 to April 2007, 94 patients underwent hemorrhoidopexy. Macroscopic appearance of the specimen (shape, size, and depth) was recorded. Microscopically, the presence of columnar, transitional, and squamous epithelium, the involvement of circular/longitudinal smooth muscle, and features of mucosal prolapse were assessed. Clinical outcome was evaluated by a validated questionnaire. Postoperative pain, secretion, and bleeding durations were 12.7 +/− 10.6, 5.6 +/− 9.6, and 6.3 +/− 8.4 days. Patient’s return to work averaged 16.7 +/− 10.7 days. Fissure, skin tags, and anal strictures were observed in 23.4%. Seven patients experienced pain for a significantly longer period of time. All specimens contained columnar mucosa, but 29.8% contained columnar and transitional epithelium and 12.8% contained columnar, anal transitional, and stratified squamous epithelium. Smooth muscle was observed in 62.7%. Pain was significantly increased if transitional epithelium was present in the specimen. No correlation or differences were observed if smooth muscle was present, although postoperative bleeding was more frequent. Hemorrhoidopexy is safe and effective. The specimen should always be sent for pathology examination. Only columnar epithelium should be present and, although the presence of smooth muscle does not influence the outcome in terms of functional results, its presence may play a role in postoperative bleeding. Presented as poster at the Digestive Disease Week, May 2007, Washington, USA  相似文献   
4.
Background Recently, it has been demonstrated that surgical treatment of hemorrhoids in a day-care basis is possible and safe. The aim of this study was to compare the Longo stapled hemorrhoidopexy (SH) and the Milligan–Morgan hemorrhoidectomy (MMH). Methods One hundred seventy one patients (95 cases in SH group and 76 cases in MMH group) entered the study: 83 cases were III degree hemorrhoids, 88 IV degree. A priori and a post hoc power analysis were performed. Results, prospectively collected, were compared using chi squared test and student t test. Visual analog scale was used for pain evaluation. Postoperative pain, duration of pain, wound secretion, bleeding, resumption of a normal lifestyle, and postoperative complication were evaluated. Results Surgical time was 28.41 ± 10.78 for MMH and 28.30 ± 13.28 min in SH (P = 0.94). Postoperative pain was not different between MMH and SH during the first two postoperative days (4.73 ± 2.91 vs 5.1 ± 3.048; P = 0.4), during the following 6 days, patients treated with SH had less pain (4.63 ± 2.04 in MMH vs 3.60 ± 2.35 in SH; P = 0.006). In the SH group, seven patients needed further hospital stay for complicated course. SH showed higher incidence of anal fissure compared with MMH (6.3% vs 0%; P = 0.025) but no differences in urinary retention, anal stricture, urgency, or anal hemorrhage. Conclusions This study confirms that SH is associated with less postoperative pain and shorter postoperative symptoms, compared with MMH. SH may be a viable addition to the therapy for hemorrhoids with some advantages in early postoperative pain and some disadvantages in postoperative complications and costs.  相似文献   
5.
CO2激光包皮环切"美容"术1624例   总被引:2,自引:0,他引:2  
目的探讨将整形美容的方法引入CO2激光包皮环切术中治疗包皮过长及包茎的疗效。方法在行常规CO2激光包皮环切术中,将整形美容的方法贯穿始终。结果1624例中,1593例术后未发生并发症,伤口愈合良好,外形美观;7例术后6h内发生出血,24例术后9~20d切口裂开。结论将整形美容的方法引入CO2激光包皮环切术中,伤口愈合良好,外形美观,疗效满意。  相似文献   
6.
目的 通过观察人体内痔不同分期粘膜及血管内皮细胞生长因子(VEGF)及碱性成纤维细胞生长因子(FGF2)的表达,探讨内痔的发生及发展机制。 方法 收集南方医院肛肠科门诊手术切除的Ⅰ、Ⅱ、Ⅲ期内痔标本134例(Ⅰ期42例,Ⅱ期45例,Ⅲ期47例),内痔周围正常肠壁组织40例作为对照,采用HE染色观察组织的病理学变化,采用免疫组织化学方法检测血管内皮细胞VEGF及FGF2的表达。 结果 正常组及Ⅰ期内痔黏膜层被覆上皮完整,未见扩张血管;Ⅱ期内痔黏膜层被覆上皮破坏,黏膜肌层破坏,黏膜层内见新生血管;Ⅲ期内痔黏膜层被覆上皮破坏,见血管管壁增厚迂曲,管腔扩张;与正常粘膜成纤维细胞相比VEGF在粘膜层成纤维细胞表达水平明显升高,并随分期增高而增高(F=883.961,P<0.01),FGF2也存在相同表达(F=656.013,P<0.01);与正常组相比VEGF在血管内皮细胞表达水平明显升高,并随分期增高而增高(F=776.561,P<0.01),FGF2在血管内皮细胞的表达水平存在相同趋势(F=1066.458,P<0.01)。 结论 VEGF及FGF2在内痔的形成过程中具有促进血管内皮细胞和粘膜下成纤维细胞增生的作用,同时可作为内痔发生发展的分子标志物。  相似文献   
7.
Multiple number of techniques and devices have been described concerning circumcision method so far. One of them is thermocautery device, and it has been widely used. Although there is controversy that the penis may be damaged due to the heat generated during the use of the device, not enough histopathological studies have been conducted. We aimed to determine the histopathological changes in human foreskin caused by heat after circumcision with thermocautery and to demonstrate the safety of the use of a thermocautery-assisted circumcision. Forty-one patients were divided into two groups according to the thermal energy used during cutting with thermocautery as follows: high temperature (Group 1, n = 22) and low temperature (Group 2, n = 19). The effect of the heat intensity and depth of the coagulation necrosis produced with thermocautery-assisted circumcisions performed at low and high temperatures were evaluated. The difference between the groups was not statistically significant. Tissue damage is extremely limited in thermocautery-assisted circumcisions, even when it is used at high temperatures. The thermocautery device can be used for effective and safe circumcisions.  相似文献   
8.
9.
影响吻合器痔上黏膜环切术疗效的因素及改进方法   总被引:5,自引:1,他引:5  
目的探讨影响吻合器痔上黏膜环切术(PPH)疗效的因素及改进方法。方法使用美国强生一次性PPH吻合器或国产PPH吻合器对68例痔病患者进行PPH手术,在手术改进前后分别对每例黏膜环切的标本以及症状的改善进行测量及观察。结果方法改进前,标本宽度为0.5~2.6cm,术后痔核回缩率75%;方法改进后,标本宽度为3.0~3.5cm,术后痔核回缩率100%。结论影响PPH手术疗效的因素主要是肛垫的提升复位与肛垫的固定。通过改进方法克服不利因素,使环切黏膜的宽度达到要求,进而使肛垫提升复位并得以固定,痔核回缩效果满意。  相似文献   
10.
Female circumcision is a traditional practice common in African countries. It involves partial or total removal of external female genitalia. It has led to many complications, in particular, the scarring of the external genitalia. The consequence is a very narrow introitus making the intracavitary brachytherapy treatment component difficult when these women develop cancer of cervix. We present two such cases from our institution. Our aim is to make the radiation and gynecological oncologists, both in developed and developing countries, aware of this practice and the problems they can encounter in the management of such cases. Intracavitary brachytherapy is an important component in the potentially curative role of radiation therapy for cervical cancer. Every effort should be made to ensure that the sequelae of genital mutilation does not deprive these women of the same standard of care as the general population.  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