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   16334篇
  免费   1076篇
  国内免费   542篇
耳鼻咽喉   241篇
儿科学   98篇
妇产科学   226篇
基础医学   623篇
口腔科学   137篇
临床医学   1360篇
内科学   2689篇
皮肤病学   105篇
神经病学   1393篇
特种医学   230篇
外国民族医学   4篇
外科学   5199篇
综合类   2179篇
预防医学   404篇
眼科学   160篇
药学   892篇
  21篇
中国医学   105篇
肿瘤学   1886篇
  2024年   27篇
  2023年   342篇
  2022年   526篇
  2021年   829篇
  2020年   737篇
  2019年   604篇
  2018年   591篇
  2017年   623篇
  2016年   754篇
  2015年   676篇
  2014年   1338篇
  2013年   1223篇
  2012年   1016篇
  2011年   1167篇
  2010年   834篇
  2009年   853篇
  2008年   852篇
  2007年   802篇
  2006年   646篇
  2005年   573篇
  2004年   456篇
  2003年   356篇
  2002年   290篇
  2001年   237篇
  2000年   181篇
  1999年   186篇
  1998年   151篇
  1997年   123篇
  1996年   117篇
  1995年   117篇
  1994年   116篇
  1993年   69篇
  1992年   52篇
  1991年   52篇
  1990年   43篇
  1989年   43篇
  1988年   40篇
  1987年   31篇
  1986年   46篇
  1985年   39篇
  1984年   46篇
  1983年   23篇
  1982年   31篇
  1981年   18篇
  1980年   15篇
  1979年   18篇
  1978年   14篇
  1977年   10篇
  1976年   6篇
  1973年   4篇
排序方式: 共有10000条查询结果,搜索用时 515 毫秒
11.
Background and Study AimsIn developing countries, endemic indications, blood shortages, and the scarcity of liver surgeons and intensive care providers can affect liver resection (LR) outcomes, but these have been rarely addressed in the literature. Therefore, in this study we determined risk factors for major complications after LR in a North African general surgery and teaching department.Patients and MethodsFrom January 2010 to December 2015, 213 consecutive LRs were performed on 203 patients. All patients underwent a postoperative follow-up of >90 days. Postoperative complications were assessed according to the Clavien–Dindo (CD) classification of surgical complications. A score of CD ≥III is considered as major postoperative complications. In this study, we analyzed the variables assumed to affect these complications.ResultsThe overall 90-day complication rate was 35.7% (n = 76), including a CD ≥III of 14% (n = 30) and a mortality rate of 6.1% (n = 14). According to the multivariate analysis, a preoperative performance status (PS) of ≥2 (P = 0.011; odds ratios [OR], 6.8; 95% confidence intervals [CI], 1.55–29.8), an estimated intraoperative blood loss of >500 ml (P = 0.002; OR, 3.71; 95% CI, 1.23–11.20), and bilioenteric anastomosis (P < 0.004; OR, 7.76; 95% CI, 1.5–3.89) were independent risk factors for major complications after LR.ConclusionWe recommend that, in the setting of a non-Eastern/non-Western general surgery and teaching department, patients with a PS of ≥2 should undergo a specific selection and preoperative optimization protocol; intermittent clamping indications should be extended; and special attention should paid to patients undergoing LR associated with biliary reconstruction, such as for perihilar cholangiocarcinoma.  相似文献   
12.
Endoscopic resections (ERs) are performed for early (T1) cancers mostly of the esophagus, stomach and colorectum, offering a minimally invasive and tissue-preserving alternative to traditional surgical resection. Proper preparation and handling of these specimens is key to allow accurate histological assessment of parameters which will dictate the curative, or non-curative, nature of the procedure. Many histological features have been identified which correlate with risk of recurrence and/or nodal metastases, thereby dictating the need for further management. These include histological subtype of the lesion, grade, depth of invasion, margin status, tumor size, lymphovascular invasion and tumor budding [at least in the colon]. This review article will discuss the ideal specimen preparation and discuss each of these histological parameters in turn, as they pertain to the esophagus, stomach and colorectum, highlighting potential caveats and pitfalls to be aware of when reporting these specimens.  相似文献   
13.
14.
15.
16.
目的探讨手术切除治疗面部色素痣的体会与患者预后情况。方法选择本院100例2016年4月—2018年4月面部色素痣患者。随机分组,物理治疗组采取CO2点阵激光治疗,手术切除组则采取手术切除方法治疗。比较两组面部色素痣控制率;患者对治疗后美观度的满意度、平均治疗的次数;治疗前后患者生活质量量表评分水平;复发率。结果手术切除组面部色素痣控制率、患者对治疗后美观度的满意度、平均治疗的次数、生活质量量表评分水平相比较物理治疗组更好,P<0.05。手术切除组患者复发率低于物理治疗组,P<0.05。结论手术切除方法治疗面部色素痣效果好。  相似文献   
17.
Lingual lymph nodes are an inconstant group of in-transit nodes, which are located on the route of lymph drainage from the tongue mucosa to the regional nodes in neck levels I and II. There is growing academic data on the metastatic spread of oral cancer, particularly regarding the spreading of oral tongue squamous cell carcinoma to lingual nodes. These nodes are not currently included in diagnostic and treatment protocols for oral tongue cancer. Combined information on surgical anatomy, clinical observations, means of detection, and prognostic value is presented. Anatomically obtained incidence of lingual nodes ranges from 8.6% to 30.2%. Incidence of lingual lymph node metastasis ranges from 1.3% to 17.1%. It is clear that lymph nodes that bear intervening tissues from the floor of the mouth should be removed to improve loco-regional control. Extended resection volume, which is required for the surgical treatment of lingual node metastasis, cannot be implied to every tongue cancer patient. As these lesions significantly influence prognosis, special efforts of their detection must be made. Reasonably, every tongue cancer patient must be investigated for the existence of lingual lymph node metastasis. Lymphographic tracing methods, which are currently implied for sentinel lymph node biopsies, may improve the detection of lingual lymph nodes.  相似文献   
18.
19.
While once considered as incurable systemic disease, treatment options for liver metastases have increased over the last 30 years and safety has improved dramatically, such that for a selected group of patients the hope of cure can now be offered with radical treatment, and low morbidity interventions can be offered which prolong survival, even in patients with more widely disseminated disease. Advances have been made in selection and surgical technique for liver resection and several adjuncts to resection now exist in the form of portal vein embolization, thermal ablation and targeted drug or radiotherapy delivery options. A natural consequence of these developments has been the delivery of services within fewer specialist units, with the result that later complications of therapy may present to local hospitals, rather than directly to the specialist centres. This article will describe the current common liver-directed therapies and outline the presentation and management of their complications.  相似文献   
20.
目的观察大承气汤足浴和足底穴位按摩护理干预对改善肿瘤切除术引起便秘的效果。方法选择2017年1月—2018年1月收治的60例住院患者,进行肿瘤切除术后随机均分为观察组和对照组,对照组给予一般护理干预,观察组在对照组的基础上使用大承气汤足浴和足底穴位按摩辅助治疗,观察患者术后便秘情况的发生率和治疗效果,对数据进行统计分析。结果对照组和观察组患者的便秘发生率有显著差异(P<0.05),对照组和观察组患者的粪便性状有显著差异(P<0.05)。结论应用大承气汤足浴和足底穴位按摩护理干预可改善肿瘤切除术后引起的便秘情况,值得推广使用。  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