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   82274篇
  免费   6681篇
  国内免费   2490篇
耳鼻咽喉   402篇
儿科学   2051篇
妇产科学   797篇
基础医学   6460篇
口腔科学   1137篇
临床医学   7724篇
内科学   9412篇
皮肤病学   648篇
神经病学   3269篇
特种医学   1906篇
外国民族医学   7篇
外科学   16895篇
综合类   14558篇
现状与发展   3篇
一般理论   5篇
预防医学   5847篇
眼科学   952篇
药学   6880篇
  125篇
中国医学   10198篇
肿瘤学   2169篇
  2024年   223篇
  2023年   1662篇
  2022年   2308篇
  2021年   4309篇
  2020年   3543篇
  2019年   3753篇
  2018年   3326篇
  2017年   3149篇
  2016年   3030篇
  2015年   2822篇
  2014年   5594篇
  2013年   5279篇
  2012年   4532篇
  2011年   5502篇
  2010年   4885篇
  2009年   3822篇
  2008年   3622篇
  2007年   3714篇
  2006年   3441篇
  2005年   2876篇
  2004年   2372篇
  2003年   2141篇
  2002年   1591篇
  2001年   1421篇
  2000年   1107篇
  1999年   979篇
  1998年   793篇
  1997年   720篇
  1996年   630篇
  1995年   654篇
  1994年   610篇
  1993年   479篇
  1992年   478篇
  1991年   431篇
  1990年   351篇
  1989年   356篇
  1988年   325篇
  1987年   281篇
  1986年   259篇
  1985年   480篇
  1984年   477篇
  1983年   365篇
  1982年   408篇
  1981年   400篇
  1980年   375篇
  1979年   347篇
  1978年   300篇
  1977年   269篇
  1976年   204篇
  1975年   124篇
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
991.
BackgroundMany factors have been reported to affect postoperative range of knee flexion after total knee arthroplasty (TKA); however, no study has reported the impact of preoperative range of motion of the hip to the postoperative flexion angle of the knee thus far.MethodsOf 38 consecutive patients who underwent posterior-stabilized TKA, we assessed 21 patients after excluding 17 patients who met exclusion criteria. The range of motion of the knee and the hip, age, body-mass index, serum albumin level, HbA1c, Kellgren–Lawrence grade, knee extension strength and radiological femorotibial angle as well as postoperative knee flexion angle at three months were evaluated. The preoperative data and the knee flexion angle at three months after TKA were compared using Spearman''s rank correlation coefficient.ResultsKnee flexion angle at three months after TKA was positively correlated with preoperative flexion (ρ = 0.616, p = 0.007) and external rotation angle (ρ = 0.576, p = 0.012) of the hip as well as preoperative knee flexion angle (ρ = 0.797, p = 0.001). There were no correlations between postoperative knee flexion angle and other preoperative data.ConclusionsPatients with restricted flexion and/or external rotation of the hip may have contractures of Gluteus maximus, Gluteus medius and Tensor fasciae latae, which can cause hypertension of iliotibial tract. It may cause decreased internal rotation of the tibia when the knee is flexed, which affects postoperative knee flexion angle, thus limited flexion and/or external rotation of the hip might restrict knee flexion angle following TKA.  相似文献   
992.
类风湿性关节炎是一种常见的慢性自身免疫性复杂疾病, 病因尚不明确, 治疗困难, 国内常以传统中医药手段将其辨证分型, 遵循“同病异治”的原则对其进行治疗。中医药辨证治疗类风湿性关节炎历史悠久, 效果显著, 同时中药方剂多靶点、多成分的特点使其更有效的缓解各自适应证患者的炎症症状。近年来传统中医药与西医的关联日渐加深, 西医技术与手段在中药治疗 RA 上的广泛应用, 不仅使 RA 不同证型的差异更加清晰, 中医辨病更加准确, 更在针对类风湿性关节炎适应证的中药方剂在临床、药效、生物学与治疗机制方面的研究取得了较大进展。文章基于中医“同病异治” “辨证分型”的原则, 对治疗类风湿性关节炎代表方剂与其研究进展进行综述。  相似文献   
993.
[目的] 探讨解毒消痈饮治疗肛周坏死性筋膜炎术后热毒炽盛期的临床效果。[方法] 将60例肛周坏死性筋膜炎患者随机分为对照组和观察组,各30例。对照组采用术后对症支持的常规治疗+痛痒消洗剂坐浴,观察组在对照组的基础上,术后口服解毒消痈饮治疗。[结果] 观察组治疗后第3、7、14天视觉模拟评分量表(VAS)评分均低于对照组,差异具有统计学意义(P<0.05);两组治疗14 d后白细胞(WBC)、C-反应蛋白(CRP)、白细胞介素-6(IL-6)较治疗前显著减低,且观察组明显低于对照组(P<0.05),而血红蛋白(Hb)较治疗前明显升高,且观察组优于对照组(P<0.05);两组治疗14 d后坏死性筋膜炎实验室风险指数评分(LRINEC)、Fournier坏疽严重程度指数(FGSI)均较治疗前显著减低,且观察组明显低于对照组(P<0.05);观察组治疗后第7、14天创面渗液和创面水肿情况评分均低于对照组,差异具有统计学意义(P<0.05);观察组创面愈合时间较对照组短(P<0.05);观察组的总有效率优于对照组(P<0.05)。[结论] 肛周坏死性筋膜炎术后热毒炽盛期应用解毒消痈饮疗效确切,能够有效缓解术后疼痛,降低炎症反应,提高血红蛋白含量,有利于评估患者术后病情及预后,减轻术后创面渗液和创面水肿,加速创面愈合。  相似文献   
994.
Inflammation-mediated carcinogenesis develops in the context of chronic inflammation and is a significant cause of cancer within the digestive system. In the chronic inflammation microenvironment, the metabolic activity of tissue cells undergoes extensive changes, which interfere with the normal function of immune cells. Dysregulation of cell metabolism and immune function has been identified as a key factor contributing to inflammation-mediated carcinogenesis within the major digestive organs, such as the stomach, liver, and colorectum. This metabolic–immune imbalance also corresponds to traditional Chinese medicine (TCM) theories of “yin-yang disharmony” and “disharmony between Ying-nutrients and Wei-defense.” The metabolic–immune imbalance has also been regarded as the key factor supporting “treatment of different diseases with the same method,” in which the same approach is adopted in the treatment of different conditions. In the TCM treatment process, it is necessary to first identify TCM patterns and then apply the corresponding TCM to correct the dysregulated metabolic and immune function, thereby blocking the progression from inflammation to malignancy. Our study findings deepen the TCM understanding of metabolic–immune dysregulation and the relationship between metabolic–immune dysregulation, pattern identification, and treatment method. They also provide new insights for the treatment of inflammation-mediated carcinogenesis in major digestive organs and help us further explore the scientific connotation of the TCM strategy of “treating different diseases with the same method.  相似文献   
995.
Pancreatic solid pseudopapillary neoplasm (SPN) is a rare low grade malignant tumour. Distinguishing this entity from other pancreatic neoplasms is critical for therapeutic decision making and prognostication. It predominantly affects young female patients <40 years of age, with excellent clinical outcome following surgical removal. The gold standard diagnostic test is cytopathological or histopathological assessment of fine needle aspirate. There are two main difficulties with this. First, SPN can present with morphological and immunohistochemical appearances that can closely mimic other pancreatic tumours, in particular, pancreatic neuroendocrine tumour (NET). Second, the amount of diagnostic material from fine needle aspiration can be limited. Here, we present a cytopathological case with both challenges during the pre-operative investigation of SPN. The case exemplifies the importance of combining morphological features with a targeted panel of immunohistochemistry to arrive at the diagnosis.  相似文献   
996.
The differential diagnosis of prostatic atypical large gland proliferations includes several benign and malignant entities. This review focusses on issues relevant to the practising pathologist, particularly around areas of controversy such as high-grade prostatic intraepithelial neoplasia (HGPIN) and intraductal carcinoma of the prostate (IDCP). HGPIN is a putative precursor of prostate cancer, but its clinical relevance is as a surrogate marker of unsampled prostate cancer, thereby identifying patients who would benefit from a prompt repeat biopsy. The incidence of missed prostate cancer is much lower in contemporary practice due to pre-biopsy MRI and extended sampling protocols so HGPIN is currently less important. It is however important to distinguish HGPIN from PIN-like carcinoma and IDCP. PIN-like carcinoma is considered a histological subtype/variant of acinar prostate carcinoma and should be graded as Gleason pattern 3. A diagnosis of cribriform HGPIN should not be made in needle biopsies as such a proliferation may represent IDCP. This review discusses controversies related to the diagnosis, reporting and management of IDCP. A personalized approach to management of patients with isolated IDCP in needle biopsies that is based on the histological and radiological features of an individual case is outlined.  相似文献   
997.
类风湿关节炎(RA)在中医学中属于“痹病”范畴,是临床中常见的难治性疾病,且呈年轻化趋势,迁延难愈。目前现代医学对RA的发病病因及机制尚不完全清楚。《素问·痹论》提出风寒湿三邪致痹,还有学者提出痰瘀致痹、肝肾亏虚等观点。李彦民主任医师根据多年临床经验提出RA的病机关键是络脉痹阻,其病机特点是虚实夹杂,临床辨证分为寒湿阻络型、湿热蕴结型、痰瘀互结型、气血两虚型、肝肾亏虚型等五型。分别采用祛邪通络和补虚通络等不同治则,辨证施法。李老师善用川乌、鸡血藤以及乌梢蛇等药以通络止痛,并主张辨证用药,内外兼治,多取良效。临床采用经验方仙龙汤,配合外用舒筋活络洗剂,且取得理想疗效。  相似文献   
998.
目的系统评价中成药和汤剂治疗肝肾阴虚证绝经后骨质疏松症(postmenopausal osteoporosis,PMOP)的疗效及安全性。方法计算机检索CNKI、CBM、VIP、万方数据库、PubMed、Embase、Cochrane图书馆,检索自建库以来至2019年9月23日的文献,按照纳排标准,收集调补肝肾法治疗PMOP的临床对照试验,依据Cochrane Handbook for Systematic Reviews of Interventions(version 5.35)进行质量评估,并使用RevMan5.3软件进行Meta分析。结果纳入9篇文献,9个研究。与常规治疗的中成药和西药相比,在降低中医证候积分[分别为MD=-3.74,95%CI(-4.86,-2.62),P<0.01;MD=-2.05,95%CI(-2.26,-1.84),P<0.01]、提高血清雌激素[分别为SMD=0.69,95%CI(0.21,1.17),P<0.01;SMD=0.37,95%CI(0.01,0.74),P=0.04]方面,单用调补肝肾法可能优于常规治疗;在临床症状疗效有效率[分别为RR=1.03,95%CI(0.90,1.17),P=0.68;RR=1.24,95%CI(0.94,1.63),P=0.13]、提高腰椎骨密度[分别为MD=0.01,95%CI(-0.03,0.05),P=0.65;MD=0.03,95%CI(-0.01,0.07),P=0.12]指标方面,与常规治疗组相比,无显著性差异。无纳入文献提示单用或联合应用以调补肝肾为治法选用的中成药和汤剂出现不良反应。结论中成药和汤剂在改善肝肾阴虚PMOP患者腰脊疼痛、腰膝酸软无力等的症状及提高血清雌激素方面,具有一定的治疗作用,具有较好的安全性。  相似文献   
999.
目的探讨心力衰竭标志物可溶性生长刺激表达因子2(sST2)替代N末端B型脑钠肽前体(NTproBNP)评价心脏术后肾功能不全患者心功能变化的临床价值。方法选择2019年1~6月我科心脏外科手术后肾功能不全患者60例作为试验组,其中男34例、女26例,平均年龄49~78(63.3±4.5)岁;另选取心脏术后肾功能正常患者60例作为对照组,其中男37例、女23例,平均年龄53~77(61.7±3.8)岁。比较两组患者围手术期左心室射血分数、心肌肌钙蛋白、肌酸肌酶、sST2及NT-proBNP等心功能指标。结果试验组患者围手术期NTproBNP显著升高,其变化幅度与其它心功能指标变化幅度差异有统计学意义,不能够准确反映术后心功能的变化程度。而sST2变化幅度与其它心功能指标变化幅度相近,基本能够反映心功能的变化程度。结论在心脏术后肾功能不全患者中,采用心力衰竭标志物sST2替代NT-proBNP作为心功能评价指标,可以真实准确地反映心功能变化程度,其优势明显,具有重要的临床价值。  相似文献   
1000.
目的:观察负压封闭引流联合银黄洗剂冲洗治疗下肢静脉性溃疡的临床疗效。方法:将52例下肢静脉性溃疡患者随机分为对照组和治疗组各26例,对照组给予负压封闭引流联合生理盐水冲洗治疗,治疗组给予负压封闭引流联合银黄洗剂冲洗治疗,疗程均为28 d。比较两组患者创面的面积及状态评分(气味、肉芽形态及疼痛的评分)、相关炎性指标(白细胞计数及超敏C反应蛋白值)的变化情况及总有效率。结果:治疗组的总有效率为88.46%,高于对照组的61.54%,差异有统计学意义(P<0.05)。与治疗前比较,两组治疗后创面的面积及状态评分明显改善,白细胞计数及超敏C反应蛋白值明显降低(P<0.05),且治疗组较对照组改善更明显,差异均有统计学意义(P<0.05)。结论:负压封闭引流联合银黄洗剂冲洗治疗下肢静脉性溃疡可有效促进肉芽组织生长、改善创面状态并降低炎性反应,明显提高创面愈合率。  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