全文获取类型
收费全文 | 4844篇 |
免费 | 150篇 |
国内免费 | 551篇 |
专业分类
耳鼻咽喉 | 738篇 |
儿科学 | 51篇 |
妇产科学 | 25篇 |
基础医学 | 104篇 |
口腔科学 | 29篇 |
临床医学 | 479篇 |
内科学 | 1601篇 |
皮肤病学 | 5篇 |
神经病学 | 80篇 |
特种医学 | 126篇 |
外科学 | 1145篇 |
综合类 | 640篇 |
预防医学 | 128篇 |
眼科学 | 22篇 |
药学 | 219篇 |
3篇 | |
中国医学 | 15篇 |
肿瘤学 | 135篇 |
出版年
2024年 | 7篇 |
2023年 | 95篇 |
2022年 | 169篇 |
2021年 | 214篇 |
2020年 | 158篇 |
2019年 | 165篇 |
2018年 | 145篇 |
2017年 | 111篇 |
2016年 | 182篇 |
2015年 | 176篇 |
2014年 | 368篇 |
2013年 | 325篇 |
2012年 | 290篇 |
2011年 | 314篇 |
2010年 | 288篇 |
2009年 | 322篇 |
2008年 | 347篇 |
2007年 | 346篇 |
2006年 | 306篇 |
2005年 | 217篇 |
2004年 | 161篇 |
2003年 | 151篇 |
2002年 | 108篇 |
2001年 | 110篇 |
2000年 | 66篇 |
1999年 | 81篇 |
1998年 | 51篇 |
1997年 | 56篇 |
1996年 | 44篇 |
1995年 | 42篇 |
1994年 | 26篇 |
1993年 | 12篇 |
1992年 | 17篇 |
1991年 | 13篇 |
1990年 | 10篇 |
1989年 | 8篇 |
1988年 | 4篇 |
1987年 | 13篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 3篇 |
1983年 | 1篇 |
1982年 | 2篇 |
1981年 | 3篇 |
1980年 | 2篇 |
1979年 | 2篇 |
1978年 | 2篇 |
1977年 | 3篇 |
1976年 | 1篇 |
1975年 | 3篇 |
排序方式: 共有5545条查询结果,搜索用时 31 毫秒
201.
目的探讨内镜除皱术与传统除皱术相结合的治疗方式及效果。方法仅存在额部皱纹、眉间纹及眉下垂者采用内镜额部除皱术,切除或切断皱眉肌、降眉肌和额肌,必要时结合额部皮瓣上提悬吊技术即可;如同时存在中下面部皮肤老化、松弛下垂,则内镜额部除皱术尚需结合传统切开法的中面部或中下面部除皱术,做浅表肌腱膜系统(sMAs)筋膜的折叠或切除缝合,以及多余皮肤的切除剪裁。结果104例采用额部内镜除皱术,均取得良好的除皱和眉提升效果。并发症较少而轻微,包括表情肌去除部位的轻度凹陷、额部皮肤麻木、发际线轻微后移、皱纹去除不彻底等。无面神经颞支损伤等严重并发症发生。其中84例存在中下面部皮肤松弛下垂,在做内镜额部除皱的同时行耳前切口的传统除皱术,明显改善中下面部的皮肤老化,并使面部上下的年轻化协调一致。结论内镜额部除皱术设计合理、操作安全、效果明确,是一项切口小、损伤轻的微创技术,符合整形外科的发展趋势。对于同时存在有中下面部皮肤松弛者,如能结合传统切开法除皱术,面部年轻化的整体效果可进一步优化。 相似文献
202.
203.
Dushyant Singh Dahiya Asim Kichloo Jagmeet Singh Michael Albosta Farah Wani 《World journal of gastrointestinal endoscopy》2021,13(1):1
Amyloidosis, a heterogenous group of disorders, is characterized by the extracellular deposition of autologous, insoluble, fibrillar misfolded proteins. These extracellular proteins deposit in tissues aggregated in ß-pleated sheets arranged in an antiparallel fashion and cause distortion to the tissue architecture and function. In the current literature, about 60 heterogeneous amyloidogenic proteins have been identified, out of which 27 have been associated with human disease. Classified as a rare disease, amyloidosis is known to have a wide range of possible etiologies and clinical manifestations. The exact incidence and prevalence of the disease is currently unknown. In both systemic and localized amyloidosis, there is infiltration of the abnormal proteins in the layers of the gastrointestinal (GI) tract or the liver parenchyma. The gold standard test for establishing a diagnosis is tissue biopsy followed by Congo Red staining and apple-green birefringence of the Congo Red-stained deposits under polarized light. However, not all patients may have a positive tissue confirmation of the disease. In these cases additional workup and referral to a gastroenterologist may be warranted. Along with symptomatic management, the treatment for GI amyloidosis consists of observation or localized surgical excision in patients with localized disease, and treatment of the underlying pathology in cases of systemic amyloidosis. In this review of the literature, we describe the subtypes of amyloidosis, with a primary focus on the epidemiology, pathogenesis, clinical features, diagnosis and treatment strategies available for GI amyloidosis. 相似文献
204.
Kazuya Akahoshi Shinichi Tamura Kazuaki Akahoshi Yoriko Kaneshiro Reiichi Sashihara Kento Uemura Kenta Sato 《World journal of gastrointestinal endoscopy》2021,13(4):111
Endoscopists are at high risk of allowing transmission of coronavirus disease 2019 (COVID-19) during gastrointestinal endoscopy (GIE) procedures under pandemic conditions. The main avenues of droplet-containing aerosol generated during GIE are the mouth, anus, and endoscopic forceps channel. Although the usefulness of personal protective equipment for preventing COVID-19 dissemination has been well reported, measures to address infected aerosol escaping during endoscopic forceps use have been neglected. Pathogen-contaminated aerosol from the endoscopic forceps channel, leading into the gastrointestinal lumen, has been confirmed and is a highly problematic source of infection. We developed a technique that entails covering the forceps entry/exit hole with a vinyl bag, thereby preventing contamination of the endoscopy room by the infected aerosol that escapes from this hole. The technique can be used in daily clinical endoscopic practice. Furthermore, this shielding technique is useful for all patients who undergo GIE, regardless of the purpose of the procedure such as for making a diagnosis, administering therapy, or in an urgent situation. In this letter, we introduce our novel, easily performed, inexpensive method of infection prevention by disallowing infected aerosol to escape from a COVID-19-infected patient into the air during a procedure that requires the use of endoscopic forceps. 相似文献
205.
Victoria Berner-Hansen August A Olsen Birgitte Brandstrup 《World journal of gastrointestinal endoscopy》2021,13(6):189-197
BACKGROUNDPrimary aorto-enteric fistula (PAEF) is a rare condition, traditionally treated in the acute, bleeding phase with open surgery or endovascular repair. However, these approaches have high morbidity and mortality, indicating a need for new methods. With advances in endoscopic techniques and equipment, haemoclipping of fistulas has now become feasible. Therefore, we present a systematic review of the English literature and a rare case of a PAEF successfully treated by endoscopic haemoclipping. CASE SUMMARYA 74-year-old man with an abdominal aortic aneurysm presented with symptoms of haemorrhagic shock and bloody stools. An oesophago-gastro-duodenoscopy was performed with haemoclipping of a suspected PAEF in the third part of the duodenum. Afterward, a computed tomography-angiography showed a contrast filled protrusion from the abdominal aortic aneurysm. Based on the clinical presentation and the combined endoscopic and radiographic findings, we argue that this is a case of a PAEF. CONCLUSIONEndoscopic therapy appears capable of achieving haemodynamic stabilisation in patients with bleeding PAEF, serving as a bridge to final therapy. 相似文献
206.
207.
23例梗阻性黄疸患者进行了鼻胆引流术(ENBD),其中胆总管结石8例,胆总管末端及乳头部狭窄4例,胆管、壶腹和胰头部癌11例,4例并发急性化脓性胆管炎.结果.21例内镜下插管成功,成功率力91.3%.21中除2例术后鼻胆引流管堵塞外,其余病例均获得较好的疗效,有效率为82.6%.血清总胆红素、ALP刊r-GT治疗后明显下降.结论:ENBD是一种简便有效的胆道引流手段,临床上可以广泛地应用于各种原因所致的梗阻性黄疸. 相似文献
208.
Kristen D. Trinca Tiffany C. Cox Jonathan P. Pearl E. Matthew Ritter 《American journal of surgery》2014
Background
Low-cost, objective systems to assess and train endoscopy skills are needed. The aim of this study was to evaluate the ability of Simulated Colonoscopy Objective Performance Evaluation to assess the skills required to perform endoscopy.Methods
Thirty-eight subjects were included in this study, all of whom performed 4 tasks. The scoring system measured performance by calculating precision and efficiency. Data analysis assessed the relationship between colonoscopy experience and performance on each task and the overall score.Results
Endoscopic trainees' Simulated Colonoscopy Objective Performance Evaluation scores correlated significantly with total colonoscopy experience (r = .61, P = .003) and experience in the past 12 months (r = .63, P = .002). Significant differences were seen among practicing endoscopists, nonendoscopic surgeons, and trainees (P < .0001). When the 4 tasks were analyzed, each showed significant correlation with colonoscopy experience (scope manipulation, r = .44, P = .044; tool targeting, r = .45, P = .04; loop management, r = .47, P = .032; mucosal inspection, r = .65, P = .001) and significant differences in performance between the endoscopist groups, except for mucosal inspection (scope manipulation, P < .0001; tool targeting, P = .002; loop management, P = .0008; mucosal inspection, P = .27).Conclusions
Simulated Colonoscopy Objective Performance Evaluation objectively assesses the technical skills required to perform endoscopy and shows promise as a platform for proficiency-based skills training. 相似文献209.
目的探讨腰椎间盘内镜技术(microendoscopic disectomy,MED)结合类固醇激素神经根鞘内注射治疗腰椎间盘突出症的效果。方法 2010-02—2012-12收治的60例腰椎椎间盘突出患者随机分为MED组30例,行MED手术,MED神经根鞘内注射组治疗30例,行MED手术并在神经根鞘杰注入5 mg地塞米松。记录两组手术前后疼痛视觉模拟量表(visualanalogue scale,VAS)评分、直腿抬高角度及术后恢复正常工作的时间,术中、术后并发症发生情况。结果与治疗前比较,两组患者治疗后VAS评分明显减低,直腿抬高角度明显升高,差异有统计学意义(P0.05);与MED组比较,MED神经根鞘内注射组患者治疗后VAS评分及直腿抬高角度的改变更明显,差异有统计学意义(P0.05);MED神经根鞘内注射组患者治疗后恢复正常工作时间明显短于MED组患者(P0.05);MED神经根鞘内注射组患者出现2例并发症,发生率6.7%,术中硬脊膜撕裂并出现脑脊液漏1例,术后因侧隐窝减压不充分和瘢痕粘连再手术1例;MED组患者出现切口感染1例,发生率为3.3%(P0.05)。结论后路脊柱显微内镜结合鞘内注射类固醇激素治疗腰椎椎间盘突出,能显著改善术后疼痛、恢复肢体活动范围及更早的恢复日常生活。 相似文献
210.
目的:探讨内镜辅助下置管治疗尿道球部断裂的治疗方法与效果。方法回顾性分析2004年7月~2012年9月内镜辅助下置管治疗尿道球部断裂19例的临床资料。结果19例全部手术治疗成功,术后留置导尿管4~8周,拔除导尿管后均能通畅排尿,定期行尿道扩张4次后,随访6~12个月,最大尿流率均>15 ml/s,无尿道狭窄、尿失禁等发生,勃起功能较术前无明显下降。结论内镜辅助下尿道置管术是一种治疗尿道球部断裂损伤的有效选择。 相似文献