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   22347篇
  免费   865篇
  国内免费   644篇
耳鼻咽喉   1070篇
儿科学   563篇
妇产科学   405篇
基础医学   736篇
口腔科学   469篇
临床医学   1394篇
内科学   1658篇
皮肤病学   142篇
神经病学   826篇
特种医学   394篇
外科学   9992篇
综合类   2596篇
预防医学   842篇
眼科学   187篇
药学   1160篇
  10篇
中国医学   144篇
肿瘤学   1268篇
  2024年   39篇
  2023年   376篇
  2022年   688篇
  2021年   811篇
  2020年   696篇
  2019年   819篇
  2018年   797篇
  2017年   620篇
  2016年   665篇
  2015年   754篇
  2014年   1457篇
  2013年   1289篇
  2012年   1418篇
  2011年   1527篇
  2010年   1447篇
  2009年   1420篇
  2008年   1277篇
  2007年   1273篇
  2006年   1075篇
  2005年   935篇
  2004年   775篇
  2003年   587篇
  2002年   522篇
  2001年   444篇
  2000年   318篇
  1999年   246篇
  1998年   190篇
  1997年   159篇
  1996年   172篇
  1995年   108篇
  1994年   100篇
  1993年   75篇
  1992年   47篇
  1991年   58篇
  1990年   48篇
  1989年   34篇
  1988年   31篇
  1987年   30篇
  1986年   41篇
  1985年   56篇
  1984年   62篇
  1983年   41篇
  1982年   44篇
  1981年   30篇
  1980年   37篇
  1979年   44篇
  1978年   47篇
  1976年   26篇
  1975年   33篇
  1974年   25篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
91.
目的:探讨双入路小切口坏死组织清除术联合持续灌注引流治疗感染性坏死性胰腺炎(INP)的临床疗效。方法:采用回顾性描述性研究方法。收集2016年4月至2019年7月陆军军医大学大坪医院收治的20例INP病人的临床资料;男11例,女9例;年龄为(42 ±9)岁。20例病人均行双入路小切口坏死组织清除术,联合术后...  相似文献   
92.
颈部坏死性筋膜炎6例   总被引:1,自引:0,他引:1  
目的:提高临床医师对颈部坏死性筋膜炎的认识。方法:回顾分析6例颈部坏死 性筋膜炎患者的临床资料及治疗结果。结果:6例患者经手术及药物治疗,5例治愈,1例因并发脓毒血症导致多器官功能衰竭死亡。结论:颈部坏死性筋膜炎 是一种进展迅速、病情凶险的感染性疾病,治疗上以尽早彻底清创、应用广谱抗菌素及支持治疗为主,增加对该病的认识有利于早期诊断,并有利于提高颈部坏死性筋膜炎的疗效。  相似文献   
93.
第一鳃裂囊肿及瘘管的诊断治疗   总被引:1,自引:0,他引:1  
目的 探讨先天性第一鳃裂囊肿及瘘管的诊断和治疗方法。方法 回顾性分析18例患者的病例资料,全部病例行手术切除。结果 18例患者中,第一鳃裂瘘 10例,外瘘口均位于耳垂后与乳突之间,内瘘口位于外耳道,其中位于骨与软骨交界处后下壁6例;囊肿8例,其中耳垂后4例,位于下颌角2例,腮腺筋膜内2例。术后病理均确诊为鳃裂囊肿或瘘管,随访未见复发。结论 先天性第一鳃裂囊肿及瘘管临床少见,易误诊、误治;影像学检查是术前确诊的重要依据;合理的手术方案是该病治愈的关键,完整切除囊肿及瘘管是避免复发的重要措施。  相似文献   
94.
目的:探讨左肝内胆管结石的治疗方法,提高手术切除率,降低手术风险系数。方法:回顾性总结63例左肝内胆管结石患者在常温下阻断左半肝血流,行左肝叶切除、肝内含石胆管直视下切开取石和肝胆管Roux-en-Y胆肠吻合等手术后,患者术后并发症、肝内胆管结石的复发率、再手术率以及术后患者的肝功能恢复情况等。结果:本组无手术死亡,治愈率82.4%,好转率17.6%,残石率8.3%。并发症23例,胆漏2例,膈下感染4例,切口感染9例,术后转氨酶升高6例,消化道出血2例,全部并发症经非手术治疗全愈。经1~8年随访,复查B超、CT、肝功等检查,随访率87.7%;复发6例,复发率9.52%。结论:该方法可以控制肝切除术中的失血,保留了健侧肝脏的血运,术中及术后对肝功能损伤较轻。是一种比较简单、可行、合理的肝血流阻断方法。  相似文献   
95.
Intervertebral disc degeneration (IDD) causes a variety of signs and symptoms, such as low back pain (LBP), intervertebral disc herniation, and spinal stenosis, which contribute to high social and economic costs. IDD results from many factors, including genetic factors, aging, mechanical injury, malnutrition, and so on. The pathological changes of IDD are mainly composed of the senescence and apoptosis of nucleus pulposus cells (NPCs), the progressive degeneration of extracellular matrix (ECM), the fibrosis of annulus fibrosus (AF), and the inflammatory response. At present, IDD can be treated by conservative treatment and surgical treatment based on patients'' symptoms. However, all of these can only release the pain but cannot reverse IDD and reconstruct the mechanical function of the spine. The latest research is moving towards the field of biotherapy. Mesenchymal stem cells (MSCs) are regard as the potential therapy of IDD because of their ability to self‐renew and differentiate into a variety of tissues. Moreover, the non‐coding RNAs (ncRNAs) are found to regulate many vital processes in IDD. There have been many successes in the in vitro and animal studies of using biotherapy to treat IDD, but how to transform the experimental data to real therapy which can apply to humans is still a challenge. This article mainly reviews the treatment strategies and research progress of IDD and indicates that there are many problems that need to be solved if the new biotherapy is to be applied to clinical treatment of IDD. This will provide reference and guidance for clinical treatment and research direction of IDD.  相似文献   
96.
ObjectiveTo compare the clinical efficacy of performing simple plate fixation with that using a plate combined with fracture end fixation to investigate the necessity of fracture end fixation outside the plate in cases of oblique fracture of the middle clavicle.MethodsThis was a retrospective follow‐up study of patients with middle clavicle oblique fractures (Robinson types 2A1 and 2A2) between 2015 and 2020. Patients were divided into two groups according to their treatment options: the simple plate fixation (SPF) group (n = 79; 43 men and 36 women; average age, 46.37 ± 14.54 years) and the plate combined with fracture local fixation (PLFP) group (n = 81; 36 men and 45 women; average age, 48.42 ± 12.55 years). Intraoperative blood loss, operation time, postoperative fracture healing time, postoperative shoulder function score (Constant–Murley and disabilities of the arm, shoulder, and hand [DASH] scores), clinical complications, and postoperative subjective satisfaction were compared between the two groups.ResultsOne hundred sixty patients with a sufficient follow‐up period were included in the final analysis: 79 in the SPF group (follow‐up time: 16.24 ± 3.94 months) and 81 in the PLFP group (follow‐up time: 16.15 ± 3.43 months). Age, sex, body mass index, follow‐up duration, fracture classification, and cause of injury were not significantly different between the two groups. There was no significant difference in blood loss, Constant–Murley and DASH scores, follow‐up period, and postoperative subjective satisfaction between the two groups (P > 0.05). The fracture healing time was shorter in the PLFP group than in the SPF group (4.41 ± 0.99 vs. 4.87 ± 1.60 months, P < 0.05), but the operation duration was longer in the PLFP group than in the SPF group (65.48 ± 16.48 min, P < 0.05). There were seven (complication rate, 8.86%) and five (complication rate, 6.17%) cases that had complications in the SPF and PLFP groups, respectively. There was no significant difference in the complication rates between the two groups (P > 0.05).ConclusionAlthough the healing time was shorter in the PLFP group than in the SPF group, the clinical efficiency of the two methods in the treatment of oblique fracture of the middle clavicle was similar.  相似文献   
97.
ObjectivePrecursor lesions may be identified in fallopian tube tissue after risk-reducing salpingo-oophorectomy (RRSO) in patients with pathogenic variants of BRCA1/2. Serous tubal intraepithelial carcinoma (STIC) is considered a precursor of high-grade serous carcinoma, whereas the significance of the p53 signature remains unclear. In this study, we investigated the relationship between the p53 signature and the risk of ovarian cancer.MethodsWe analyzed the clinicopathological findings and conducted DNA sequencing for TP53 variants of p53 signatures and STIC lesions isolated using laser capture microdissection in 13 patients with pathogenic variants of BRCA1/2 who underwent RRSO and 17 control patients with the benign gynecologic disease.Results TP53 pathogenic variants were detected significantly higher in RRSO group than control (p<0.001). No difference in the frequency of p53 signatures were observed between groups (53.8% vs 29.4%; p=0.17). TP53 sequencing and next-generation sequencing analysis in a patient with STIC and occult cancer revealed 2 TP53 mutations causing different p53 staining for STICs and another TP53 mutation shared between STIC and occult cancer.ConclusionThe sequence analysis for TP53 revealed 2 types of p53 signatures, one with a risk of progression to STIC and ovarian cancer with pathological variants in TP53 and the other with a low risk of progression without pathological variants in TP53 as seen in control.  相似文献   
98.
Open in a separate window OBJECTIVESPump thrombosis remains a major challenge in heart failure patients with left ventricular HeartWare assist device. Current International Society for Heart and Lung Transplantation recommendations favour surgical pump exchange over lysis because safety and efficacy of lysis has been controversially reported. This study summarizes our experience on our HeartWare thrombosis prevention strategy as well as thrombolysis through implementation of our institutional standardized HeartWare assist device protocol.METHODSOutcomes of all HeartWare thrombosis patients admitted between 2010 and 2020 were analysed. Thrombolysis therapy using tissue plasminogen activator was used as the first-line therapy in this study and thrombolysis therapy efficacy was defined as freedom from stroke, bleeding, recurrent HeartWare assist device thrombosis or surgical device exchange within 30 days after lysis application.RESULTSA total of 507 patients have been included in this study and 66 patients (13%) collectively developed a first HeartWare-thrombosis after a median of 12 months (8–22 months) after HeartWare implantation. Forty patients were treated with unstandardized lysis, of whom 7 patients had thrombolysis associated complications, such as incomplete thrombus resolution requiring surgical pump exchange in 4 patients, but also intracranial haemorrhage occurring in 3 patients. Three patients died in the non-protocol group. Eight device thrombosis patients were treated according to our protocol, showing no lysis-associated complication.CONCLUSIONSDespite current recommendations, preferring surgical HeartWare pump exchange in thrombosis, thrombolysis therapy for first HeartWare thrombosis can be safe and effective in a standardized protocol setting, including anticoagulation adjustment and intensified blood pressure control management.  相似文献   
99.
100.
目的 观察扁桃体下极被膜保留的扁桃体切除术在儿童阻塞性睡眠呼吸暂停(OSA)中的可行性及优势。方法 将2018年8月—2019年12月行扁桃体下极被膜保留扁桃体切除术(91例)与2017年1月—2018年7月行传统扁桃体切除术(100例)治疗儿童OSA患者的临床资料进行回顾性对比分析。比较两组手术时间、术中出血、术后疼痛评分、术后并发症、随访1年的情况。结果 两组手术时间及术中出血无明显差异,下极被膜保留组术后第1天、第3天疼痛评分显著低于传统手术组(P<0.05)。术后出血率传统手术组(7/100,7%)高于下极被膜保留组(2/91,2.19%)(P<0.05)。术后随访1年,两组均未出现局部感染及再发扁桃体肥大情况。结论 扁桃体下极被膜保留的扁桃体切除术是儿童OSA的一种安全可行的手术方式,可以有效降低术后出血风险及术后疼痛。  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