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   7049篇
  免费   587篇
  国内免费   371篇
耳鼻咽喉   117篇
儿科学   533篇
妇产科学   171篇
基础医学   414篇
口腔科学   63篇
临床医学   728篇
内科学   1475篇
皮肤病学   101篇
神经病学   54篇
特种医学   401篇
外国民族医学   3篇
外科学   1850篇
综合类   567篇
预防医学   166篇
眼科学   37篇
药学   304篇
中国医学   44篇
肿瘤学   979篇
  2024年   18篇
  2023年   110篇
  2022年   245篇
  2021年   317篇
  2020年   254篇
  2019年   263篇
  2018年   246篇
  2017年   233篇
  2016年   305篇
  2015年   284篇
  2014年   409篇
  2013年   465篇
  2012年   375篇
  2011年   393篇
  2010年   332篇
  2009年   355篇
  2008年   377篇
  2007年   385篇
  2006年   381篇
  2005年   277篇
  2004年   235篇
  2003年   185篇
  2002年   159篇
  2001年   160篇
  2000年   124篇
  1999年   91篇
  1998年   116篇
  1997年   104篇
  1996年   77篇
  1995年   73篇
  1994年   70篇
  1993年   48篇
  1992年   49篇
  1991年   48篇
  1990年   52篇
  1989年   31篇
  1988年   49篇
  1987年   33篇
  1986年   38篇
  1985年   28篇
  1984年   26篇
  1983年   18篇
  1982年   28篇
  1981年   33篇
  1980年   19篇
  1979年   24篇
  1978年   15篇
  1977年   16篇
  1976年   11篇
  1975年   8篇
排序方式: 共有8007条查询结果,搜索用时 15 毫秒
41.
42.
Summary In patients with malignant tumors a high incidence of haemostatic disorders occurs. The reaction of thrombin with its major inhibitor antithrombin III (AT III) leads to the formation of a stable complex, which represents a sensitive marker for the activation of intravascular coagulation. In 153 patients suffering from different kinds of gynaecological malignancy thrombin-antithrombin III-complex (TAT) levels were measured. In 21 cases the course of the disease was studied. Of 153 patients with gynaecological malignancy 102 (67%) showed TAT plasma concentrations above the normal range before therapy. Seven patients with elevated TAT levels before treatment showed a decrease of TAT concentrations to the normal range when no evidence of disease was obvious. In 5 cases TAT levels were in the normal range before and after successful therapy. 4 patients with tumor progression and 5 patients with tumor recurrence showed an increase of TAT levels. The TAT plasma concentrations correlated with the presence or absence of the tumor. Measurement of TAT plasma concentrations in gynaecologic malignancies can detect any thromboembolic risk for the patient and in addition can reveal information about the course of the disease.Abbreviations Thrombin-Antithrombin III Komplex (TAT) - Antithrombin III (AT III)  相似文献   
43.
本文旨在探讨盆腔恶性肿瘤的介入性治疗问题。对45例患有盆腔恶性肿瘤的患者,采用Seldinger法,经双侧股动脉插管,先端选择性导入对侧髂内动脉;或一侧导入肠系膜下动脉,另侧导入髂内动脉,留置导管12小时,使用突击剂量持续灌注化疗药物。并经手术、B超、CT、内窥镜及指检等方法进行化疗前后的对比观察。结果:其中病灶消失持续1个月以上者9例、病灶缩小50%以上并持续超过一个月者23例、缩小不足50%且增大未达25%者9例、增大超过25%以上者4例,总有效率为71.1%。10例患者出现了脱发及皮肤色素沉着,1例患者出现下肢动脉栓塞,10例出现了不同程度的消化道反应等。结论:本法损伤小,操作简便安全,可多次重复术式:选择性强,药效持久均衡且毒副作用小;可提高手术切除率,也为不能手术的癌肿提供一种较理想的治疗手段。  相似文献   
44.
Hypercalcemia in breast cancer   总被引:1,自引:0,他引:1  
Hypercalcemia is relatively frequent in malignancy with or without osteolytic bone metastases. It is thought that neoplastic cells may secrete substances which not only stimulate osteoclastic activity but are also capable of modifying the absorption, excretion, and resorption of calcium and phosphate ions. Since 1987, we have studied 24 breast cancer patients with hypercalcemia (22 with bone metastases and two without). The group of 22 patients with bone metastases were divided into two subgroups. The first consisted of 10 patients with high serum levels of humoral factors, such as parathyroid hormone-related protein (PTHrP), and/or prostaglandin E2 (PGE2) and/or interleukin 1 (IL-1), and high levels of bone markers, such as alkaline phosphatase, bone Gla protein and urinary hydroxyproline. The second subgroup consisted of 12 patients with high levels of bone markers alone. Bone histologic analysis showed an osteoclastic activation surrounding metastatic tumor tissue in six out of 10 patients of the first subgroup, while an evident osteolysis caused by the tumor cells was noted in seven out of 12 patients of the second subgroup. The two patients without bone metastases showed normal biochemistry and bone histologic examination. The authors, having tried to explain the pathogenesis of hypercalcemia, emphasize the importance of humoral factors secreted by tumor cells as a direct or indirect cause of hypercalcemia. The origin of hypercalcemia remains unclear in two patients without bone metastases.  相似文献   
45.
Corticosteroid therapy in biliary atresia   总被引:4,自引:0,他引:4  
Sixteen patients with biliary atresia had 44 steroid courses for treatment of cholangitis or diminution of bile flow following Kasai hepatic portoenterostomy operations. A "blast" type (high dose/short duration) steroid administration was employed to potentiate the choleretic and anti-inflammatory effect. There was a significant augmentation of bile flow and a reduction in maximum temperature, serum bilirubin, and alkaline phosphatase.  相似文献   
46.
目的:总结皮下通道型胆囊肝胆管成形术的临床效果。方法:统计了1994年以来我院76例行STHG手术患者的适应症、临床效果及术后早期并发症。并选择同期实施的125 列行传统胆肠吻合(CJ)的患者进行对照。结果:STHG的手术适应症与传统胆肠吻合基本相同;STHG组患者的手术时间、住院时间、术中出血量明显少于CJ组,术后恢复良好,仅2例次并发症。结论;该术式既保存了胆囊及Oddi括约肌功能,又保证了胆汁的生理流向;防止了肠液的反,所以避免了消化功能紊乱,防止了反 流性胆管炎,对患者的影响小,是一种较为理想的治疗肝胆管结石和肝门胆管狭窄的术式。  相似文献   
47.
Active malignancy is an absolute contraindication to kidney transplantation. As for chronic myeloid leukemia (CML), a Philadelphia chromosome-positive myeloproliferative neoplasm, the introduction of tyrosine kinase inhibitors has transformed CML from a lethal into a manageable chronic disease with a close-to-normal life expectancy. To date it is unknown whether kidney transplantation can be safely performed in patients with pre-existing CML. We describe the clinical course of a 57-year-old male patient with chronic kidney disease caused by reflux nephropathy. This patient had undergone first kidney transplantation 20 years earlier and had again been on chronic hemodialysis for 6 years when CML was diagnosed. First-line therapy with 400 mg imatinib daily was well tolerated and induced an optimal cytogenetic and molecular response 3 months after initiation. One and a half years after CML diagnosis, a second kidney transplantation from a deceased donor was performed. Immunosuppression included basiliximab, tacrolimus, mycophenolate mofetil, and corticosteroids. Currently, 2 years posttransplant, renal allograft function is stable (serum creatinine 1.09 mg/dL, estimated glomerular filtration rate 75 mL/min per 1.73 m2), and CML remains in deep molecular remission with imatinib. Imatinib-treated CML in deep molecular remission could be regarded as inactive malignancy and may therefore not be viewed as an absolute contraindication to kidney transplantation.  相似文献   
48.
Organ transplant recipients (OTRs) are at increased risk of cutaneous malignancy. Skin disorders in OTRs of color (OTRoC) have rarely been systematically assessed. We aimed to ascertain the burden of skin disease encountered in OTRoC by prospectively collecting data from OTRs attending 2 posttransplant skin surveillance clinics: 1 in London, UK and 1 in Philadelphia, USA. Retrospective review of all dermatological diagnoses was performed. Data from 1766 OTRs were analyzed: 1024 (58%) white, 376 (21%) black, 261 (15%) Asian, 57 (3%) Middle Eastern/Mediterranean (ME/M), and 48 (2.7%) Hispanic; and 1128 (64%) male. Viral infections affected 45.1% of OTRs, and were more common in white and ME/M patients (P < .001). Fungal infections affected 28.1% and were more common in ME/M patients (P < .001). Inflammatory skin disease affected 24.5%, and was most common in black patients (P < .001). In addition, 26.4% of patients developed skin cancer. There was an increased risk of skin cancer in white vs nonwhite OTRs (HR 4.4, 95% CI 3.5-5.7, P < .001): keratinocyte cancers were more common in white OTRs (P < .001) and Kaposi sarcoma was more common in black OTRs (P < .001). These data support the need for programs that promote targeted dermatology surveillance for all OTRs, regardless of race/ethnicity or country of origin.  相似文献   
49.
Patients undergoing evaluation for solid organ transplantation (SOT) often have a history of malignancy. Although the cancer has been treated in these patients, the benefits of transplantation need to be balanced against the risk of tumor recurrence, especially in the setting of immunosuppression. Prior guidelines of when to transplant patients with a prior treated malignancy do not take in to account current staging, disease biology, or advances in cancer treatments. To develop contemporary recommendations, the American Society of Transplantation held a consensus workshop to perform a comprehensive review of current literature regarding cancer therapies, cancer stage-specific prognosis, the kinetics of cancer recurrence, and the limited data on the effects of immunosuppression on cancer-specific outcomes. This document contains prognosis based on contemporary treatment and transplant recommendations for breast, colorectal, anal, urological, gynecological, and nonsmall cell lung cancers. This conference and consensus documents aim to provide recommendations to assist in the evaluation of patients for SOT given a history of a pretransplant malignancy.  相似文献   
50.
Immune checkpoint inhibitors (ICPIs) are monoclonal antibodies against inhibitory receptors on T cells resulting in anticancer activity. In kidney transplant (KT) recipients, ICPI use has been associated with acute allograft rejection. In failed allografts, however, the effects of ICPIs are unknown. We present a case of a 66-year-old man with a history of diabetes, renal cell cancer, left native nephrectomy, and end-stage kidney disease. He received a deceased donor KT which failed after 6 years due to biopsy-proven recurrent diabetic nephrosclerosis. He was started on hemodialysis and his immunosuppression was gradually weaned off. A year later, he was diagnosed with renal cell cancer in his right native kidney requiring nephrectomy. He later developed metastasis and was started on combination ICPIs. He developed hematuria, allograft pain, and malaise consistent with graft intolerance syndrome 28 days after starting ICPIs. Urine culture and cystoscopy were normal. A computed tomography scan of his abdomen revealed an enlarged allograft with patchy enhancement. After a multidisciplinary discussion, he underwent transplant nephrectomy. Histopathology showed chronic active T cell–mediated rejection. As ICPI use becomes prevalent, practitioners need to be aware of its potential complications among KT recipients both with functioning and failed allografts.  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