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   83668篇
  免费   5810篇
  国内免费   2005篇
耳鼻咽喉   3104篇
儿科学   975篇
妇产科学   1563篇
基础医学   2477篇
口腔科学   3311篇
临床医学   8269篇
内科学   7390篇
皮肤病学   714篇
神经病学   2925篇
特种医学   1672篇
外国民族医学   20篇
外科学   28430篇
综合类   12134篇
现状与发展   6篇
一般理论   2篇
预防医学   3025篇
眼科学   4592篇
药学   3375篇
  173篇
中国医学   1739篇
肿瘤学   5587篇
  2024年   198篇
  2023年   2161篇
  2022年   2773篇
  2021年   4450篇
  2020年   4477篇
  2019年   3762篇
  2018年   3586篇
  2017年   3198篇
  2016年   3244篇
  2015年   3233篇
  2014年   6523篇
  2013年   6019篇
  2012年   4911篇
  2011年   5156篇
  2010年   4043篇
  2009年   3855篇
  2008年   3618篇
  2007年   3676篇
  2006年   3193篇
  2005年   2824篇
  2004年   2407篇
  2003年   1989篇
  2002年   1603篇
  2001年   1490篇
  2000年   1304篇
  1999年   1154篇
  1998年   939篇
  1997年   914篇
  1996年   688篇
  1995年   549篇
  1994年   488篇
  1993年   389篇
  1992年   340篇
  1991年   315篇
  1990年   216篇
  1989年   218篇
  1988年   207篇
  1987年   208篇
  1986年   166篇
  1985年   183篇
  1984年   169篇
  1983年   105篇
  1982年   129篇
  1981年   103篇
  1980年   91篇
  1979年   63篇
  1978年   46篇
  1977年   39篇
  1976年   29篇
  1975年   23篇
排序方式: 共有10000条查询结果,搜索用时 31 毫秒
91.
92.
ObjectiveBorderline ovarian tumours (BOTs) are characterized by the presence of cellular proliferation and nuclear atypia without stromal invasion. Compared to malignant ovarian tumours, BOTs have better prognoses. The most important treatment of BOT is surgery. Considering the good prognosis of BOT, fertility-sparing surgery (FSS) can be considered for young women who desire to preserve fertility. Our study evaluated the pregnancy rate in patients with childbearing desire, the efficacy and risk of recurrence of women affected by BOTs who have undergone FSS.Materials and methodsPatients characteristics have been restrospectively retrieved for diagnosis made from June 2000 to December 2017 from San Raffaele Hospital and Policlinico Cagliari. Patients underwent FSS for BOT were interviewed about child wishing and pregnancy outcomes.Results85 patients were recruited for the study. Median age at diagnosis was 33 years. Unilateral salpingo-oophorectomy was performed in 33 patients (38%), unilateral cystectomy in 40 (47%) and 12 underwent both procedures (14%). 40 women (50%) tried to conceive after surgery. The pregnancy rate was 73% and live birth rate was 67%. Childbearing desire and age at diagnosis were significantly associated with the pregnancy rate.ConclusionsConservative surgical treatment seems to be a reasonable therapeutic option for women with BOTs who wish to preserve fertility. Our results suggest that the obstetric outcomes after FSS are promising. Maternal desire and the age of diagnosis are the most important factors affecting PR after surgery. Fertility counselling should be an integral part of the clinical management of women with BOT.  相似文献   
93.
《The Journal of arthroplasty》2022,37(10):1922-1927.e2
BackgroundRegional nerve blocks may be used as a component of a multimodal analgesic protocol to manage postoperative pain after primary total hip arthroplasty (THA). The purpose of our study was to evaluate the efficacy and safety of regional nerve blocks after THA in support of the combined clinical practice guidelines of the American Association of Hip and Knee Surgeons, American Academy of Orthopaedic Surgeons, Hip Society, Knee Society, and American Society of Regional Anesthesia and Pain Management.MethodsWe searched MEDLINE, Embase, and the Cochrane Central Register of Controlled Trials for studies published prior to March 24, 2020 on fascia iliaca, lumbar plexus, and quadratus lumborum blocks in primary THA. All included studies underwent qualitative and quantitative homogeneity testing followed by a systematic review and direct comparison meta-analysis to assess the efficacy and safety of the regional nerve blocks.ResultsAn initial critical appraisal of 3,382 publications yielded 11 publications representing the best available evidence for an analysis. Fascia iliaca, lumbar plexus, and quadratus lumborum blocks demonstrate the ability to reduce postoperative pain and opioid consumption. Among the available comparisons, no difference was noted between a regional nerve block or local periarticular anesthetic infiltration regarding postoperative pain and opioid consumption.ConclusionLocal periarticular anesthetic infiltration should be considered prior to a regional nerve block due to concerns over the safety and cost of regional nerve blocks. If a regional nerve block is used in primary THA, a fascia iliaca block is preferred over other blocks due to the differences in technical demands and risks associated with the alternative regional nerve blocks.  相似文献   
94.
Conclusion: Recurrent respiratory papillomatosis (RRP) patients with high surgical treatment frequency (≥ 1/year, HF) were significantly younger and had a more widespread laryngeal disease compared to a low frequency treated group (< 1 treatment/year, LF). This study confirms the existence of a clinical RRP group, not primarily related to HPV sub-type, but more care-intensive and in need of more vigilant follow-up. Objectives: RRP is associated with high morbidity due to its influence on breathing and voice. The purpose of this study was to characterize RRP patients in northern Sweden and investigate possible predictor factors affecting therapeutic needs. Method: Patients from the regional referral area (northern Sweden) were categorized for age, disease duration, juvenile or adult onset, profile of disease development, number of surgical sessions in relation to disease duration, laryngeal deposition of papilloma, gender, and HPV sub-types, in order to identify patients with increased need for frequent surgical treatment. Results: The median age of the RRP patients (n = 48) was 44.5 years; 34 (71%) were males and 14 (29%) females, most were infected with HPV 6. Patients with high surgical treatment frequency/year were significantly younger and showed more widespread papillomatous vegetation in the larynx, compared to the low frequency treated group.  相似文献   
95.
美国胃肠病协会(AGA)于2019年8月在Gastroenterology(《胃肠病学》)杂志上发表了针对胰腺坏死处理的临床实践专家共识的更新,归纳并总结了当前的临床证据与专家意见,旨在为胰腺坏死这一复杂临床情况的最佳干预提供指导建议。近年来,随着临床实践的不断深入,急性胰腺炎胰腺坏死的处理经历了较大的变革。从一开始的以手术为主的清创策略过渡到现阶段较为成熟的升阶梯治疗模式。针对胰腺坏死的治疗主要包含两个方面:非手术治疗和有创干预。其中,非手术治疗主要包括抗菌治疗和营养支持等。一旦坏死组织发生感染或无菌性坏死使病人产生显著临床症状,提示有强烈干预指征时,此时更多地依赖于有创干预。升阶梯治疗模式的主要内容为:以经皮引流或透壁内镜引流为首要手段,对于引流无法处理的大量固体坏死,可进行经皮微创或经内镜下坏死清除,若微创手段干预无效可进行开放手术清创。关于选择经皮微创阶梯治疗还是经内镜阶梯治疗,目前尚无研究显示两者之间对病死率等主要临床结局产生影响,不同治疗中心可根据各中心的专业特长和医疗资源,合理选择治疗方案。  相似文献   
96.
97.
总结了全国著名骨伤专家梁铁民教授的学术思想和正骨经验,简述了梁老生平。梁老学术思想表现在突出整体观念,主张辨证施术;注重调理气血,强调药物接续;重视望问切触量法五诊结合等三个方面。对于梁老正骨经验先进行了综合论述,进一步佐证其学术思想;后分别从小儿桡骨头半脱位、颈椎错位、胸腰椎小关节错位、肋骨骨折等梁老研究较深入和比较擅长的几个方面进行了阐述。特别是颈椎错位这种高难度高风险的手法操作,体现出梁老高超的手法技艺。  相似文献   
98.
99.
目的探讨儿童外科的教学特点及教学方法,提高儿外科医生的总体执业水平,促进儿童外科学的发展。方法通过分析四川大学华西医院多年儿童外科疾病的临床教学实践经验,总结出适合医学生、初级儿童外科专科医生的实用的教学方法及经验。结果结合儿童外科特有的疾病特点所总结出的故事式讲述教学、典型病例教学、漫画形式学习、比较学习法及多媒体素材教学五种方式是非常适合儿童外科教学的方法。能够加深记忆,提高兴趣,轻松快捷,事半功倍的掌握相关医学专业知识。结论独特有趣的儿童外科教学方法可提高医学生及儿童外科初级从业者的学习兴趣、专业知识和执业水平。  相似文献   
100.
In patients with non-tuberculous mycobacterial cervicofacial lymphadenitis, incomplete surgical removal of infected lymph nodes leads to delayed healing and a higher recurrence rate, with eventual spontaneous drainage through the skin. However, complete surgical removal is not always achievable due to the extent of the infected tissue and proximity to vulnerable structures, such as the facial or accessory nerve. The aim of this study was to identify the clinical determinants of the (in)ability to perform complete surgical removal. The electronic health records of patients aged 0–15 years with bacteriologically proven non-tuberculous mycobacterial cervicofacial lymphadenitis, who underwent surgical treatment and preoperative sonographic imaging, were analysed. This was a case–control study. A total of 103 patients met the inclusion criteria. Most of the infections were unilateral, submandibular, and caused by Mycobacterium avium. Multiple logistic regression analysis revealed that higher age (odds ratio 1.24, 95% confidence interval 1.04–1.47) and fistulization (odds ratio 3.15, 95% confidence interval 1.13–8.75) were significantly associated with a limited ability to surgically remove all infected tissue. However, a larger sonographic lymph node size was not significantly associated. These findings could aid clinicians when informing the parent(s)/guardian(s) of the patient preoperatively and in properly estimating the intraoperative and postoperative course.  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