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   11422篇
  免费   797篇
  国内免费   142篇
耳鼻咽喉   13篇
儿科学   74篇
妇产科学   59篇
基础医学   356篇
口腔科学   37篇
临床医学   486篇
内科学   6031篇
皮肤病学   11篇
神经病学   638篇
特种医学   92篇
外科学   179篇
综合类   327篇
预防医学   1045篇
眼科学   28篇
药学   2740篇
  1篇
中国医学   92篇
肿瘤学   152篇
  2023年   51篇
  2022年   87篇
  2021年   271篇
  2020年   348篇
  2019年   474篇
  2018年   423篇
  2017年   458篇
  2016年   463篇
  2015年   397篇
  2014年   741篇
  2013年   1332篇
  2012年   564篇
  2011年   640篇
  2010年   540篇
  2009年   577篇
  2008年   588篇
  2007年   512篇
  2006年   421篇
  2005年   229篇
  2004年   289篇
  2003年   287篇
  2002年   239篇
  2001年   218篇
  2000年   208篇
  1999年   188篇
  1998年   210篇
  1997年   163篇
  1996年   185篇
  1995年   148篇
  1994年   127篇
  1993年   150篇
  1992年   113篇
  1991年   77篇
  1990年   51篇
  1989年   25篇
  1988年   43篇
  1987年   33篇
  1986年   26篇
  1985年   98篇
  1984年   70篇
  1983年   35篇
  1982年   28篇
  1981年   35篇
  1980年   31篇
  1979年   25篇
  1978年   28篇
  1977年   19篇
  1976年   23篇
  1975年   16篇
  1974年   19篇
排序方式: 共有10000条查询结果,搜索用时 171 毫秒
1.
目的探讨乙肝相关性肝癌临床病理学特征与溶血磷脂酸(LPA)和高敏C反应蛋白(hs-CRP)表达的相关性。方法选取2019年1月至2020年1月间河南省驻马店市中心医院收治的198例乙肝相关性肝癌患者作为乙肝组,198例酒精相关性肝癌患者作为酒精组。两组患者都进行血清hs-CRP和LPA表达检测,调查患者的病理学特征并进行相关性分析。结果乙肝组患者血清hs-CRP和LPA含量均高于酒精组,差异均有统计学意义(均P <0.05)。两组患者血清ALP、AFP、ALT、AST和GGT含量比较,差异均无统计学意义(P> 0.05)。乙肝组不同临床分期和组织学分化患者的血清hs-CRP和LPA含量比较,差异均有统计学意义(均P <0.05)。乙肝组患者的临床分期和组织学分化与血清hs-CRP和LPA表达均存在相关性,差异均有统计学意义(均P <0.05)。患者的临床分期和组织学分化均为影响hs-CRP和LPA表达的重要因素,差异均有统计学意义(均P <0.05)。结论相对于酒精相关性肝癌,乙肝相关性肝癌的血清hs-CRP和LPA呈现高表达,与患者的临床病理学特征存在相关性。  相似文献   
2.
酒精依赖是一种常见的精神类疾病,复饮率极高。作者对酒精依赖患者复饮的影响因素和护理干预措施的最新研究进展进行综述,为医护人员制定治疗护理策略提供参考信息。  相似文献   
3.
4.
Abstract

Purpose: In our study, we aimed to investigate the ganglion cell-inner plexiform layer thickness (GCIPL), retinal nerve fibre layer thickness (RNFL), mean macular volume (MMV), central macular thickness (CMT), mean macular thickness (MMT), and choroidal thickness (CT) values with optical coherence tomography (OCT) in patients who are diagnosed with alcohol use disorder (AUD).

Materials and methods: The study included 43 patients who were diagnosed with AUD, and 43 healthy controls. Detailed biomicroscopic examinations of all the participants, visual acuity, intraocular pressure, anterior and posterior segment examinations, and then, OCT measurements were carried out.

Results: Although the measured values for RNFL in the superior and temporal quadrant are within normal limits, they were slightly higher compared to those in the control group (p values 0.127 and 0.191 for superior quadrant and temporal quadrant, respectively). The CT measurements in all quadrants were higher than the control group; however, these measurements were not statistically significant (p?>?0.05). When the relation between clinical features and OCT findings of the patients were examined, it was determined that the ages of the patients were statistically significantly and inversely correlated with the temporal CT and also the nasal and temporal quadrants of RNFL.

Conclusions: Our study is the first study that examines the retinal GCIPL and CT with OCT in patients who are diagnosed with AUD. In our results, it was determined that there were no statistically significant differences between the participants in terms of OCT parameters. Further studies with larger sampling groups evaluating neurotransmission findings may provide wider results.  相似文献   
5.
Objective: There is a need for brief methods to screen for at-risk drinking. The FAST is a two-stepped structured questionnaire. In the FAST-1, one question categorizes into three groups: low-risk drinking, potential at-risk drinking or at-risk drinking. In the FAST-2, those with potential at-risk drinking are asked three additional questions. The aim was to study its effectiveness in screening for at-risk drinking among women and to define an optimal cut-off score.

Method: The FAST was validated against the Timeline Followback (TLFB) utilizing data from a health check of a group of 40-year old women (response rate 69.2%; n = 907/1311). The TLFB-based definition of at-risk drinking was consuming ≥140 grams of alcohol weekly (6.1% reported at-risk drinking).

Results and conclusions: Of all women, 54.5% could be correctly classified either as having low-risk or at-risk drinking with the FAST-1. The optimal cut-off score was ≥2 (sensitivity 0.82, specificity 0.86) which is lower than has previously been reported. Only those with a FAST-1 score of one needed further evaluation with the FAST-2. A FAST-2 score of ≥1 resulted in a positive screen for at-risk drinking. The FAST seems to be a valid and feasible method in screening for at-risk drinking among middle-aged women.  相似文献   

6.
7.
IntroductionEndoscopic surveillance guidelines for patients with repaired esophageal atresia (EA) rely primarily on expert opinion. Prior to embarking on a prospective EA surveillance registry, we sought to understand EA surveillance practices within the Eastern Pediatric Surgery Network (EPSN).MethodsAn anonymous, 23-question Qualtrics survey was emailed to 181 physicians (surgeons and gastroenterologists) at 19 member institutions. Likert scale questions gauged agreement with international EA surveillance guideline-derived statements. Multiple-choice questions assessed individual and institutional practices.ResultsThe response rate was 77%. Most respondents (80%) strongly agree or agree that EA surveillance endoscopy should follow a set schedule, while only 36% claimed to perform routine upper GI endoscopy regardless of symptoms. Many institutions (77%) have an aerodigestive clinic, even if some lack a multi-disciplinary EA team. Most physicians (72%) expressed strong interest in helping develop evidence-based guidelines.ConclusionsOur survey reveals physician agreement with current guidelines but weak adherence. Surveillance methods vary greatly, underscoring the lack of evidence-based data to guide EA care. Aerodigestive clinics may help implement surveillance schedules. Respondents support evidence-based protocols, which bodes well for care standardization. Results will inform the first multi-institutional EA databases in the United States (US), which will be essential for evidence-based care.Level of EvidenceThis is a prognosis study with level 4 evidence.  相似文献   
8.
PurposeThe purpose of this study was to analyze the management and outcomes of primary button battery ingestions and their sequelae at a single high-volume center, and to propose a risk score to predict the likelihood of a severe outcome.MethodsThe medical record was queried for all patients under 21 years old evaluated at our institution for button battery ingestion from 2008 to 2021. A severe outcome was defined as having at least one of the following: deep/circumferential mucosal erosion, perforation, mediastinitis, vascular or airway injury/fistula, or development of esophageal stricture. From a selection of clinically relevant factors, logistic regression determined predictors of a severe outcome, which were incorporated into a risk model.Results143 patients evaluated for button battery ingestion were analyzed. 24 (17%) had a severe outcome. The independent predictors of a severe outcome in multivariate analysis were location of battery in the esophagus on imaging (96%), battery size >/ = 2 cm (95%), and presence of any symptoms on presentation (96%), with P < 0.001 in all cases. Predicted probability of a severe outcome ranged from 88% when all three risk factors were observed, to 0.3% when none were present.ConclusionWe report the presentation, management, and complication profiles of a large cohort of BB ingestions treated at a single institution. A risk score to predict severe outcomes may be used by providers initially evaluating patients with button battery ingestion in order to allocate resources and expedite transfer to a center with pediatric endoscopic and surgical capabilities.Level of evidenceLevel IV.Type of studyClinical Research Paper.  相似文献   
9.
10.
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