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   40527篇
  免费   3184篇
  国内免费   400篇
耳鼻咽喉   212篇
儿科学   607篇
妇产科学   747篇
基础医学   1208篇
口腔科学   621篇
临床医学   9390篇
内科学   3119篇
皮肤病学   218篇
神经病学   795篇
特种医学   530篇
外国民族医学   1篇
外科学   4150篇
综合类   6595篇
现状与发展   3篇
一般理论   3篇
预防医学   10737篇
眼科学   191篇
药学   3434篇
  120篇
中国医学   635篇
肿瘤学   795篇
  2024年   34篇
  2023年   818篇
  2022年   1283篇
  2021年   2004篇
  2020年   2568篇
  2019年   1573篇
  2018年   1481篇
  2017年   1525篇
  2016年   1572篇
  2015年   1565篇
  2014年   3733篇
  2013年   3395篇
  2012年   3077篇
  2011年   3045篇
  2010年   2529篇
  2009年   2101篇
  2008年   2124篇
  2007年   1836篇
  2006年   1688篇
  2005年   1283篇
  2004年   1086篇
  2003年   822篇
  2002年   576篇
  2001年   428篇
  2000年   352篇
  1999年   272篇
  1998年   258篇
  1997年   185篇
  1996年   158篇
  1995年   108篇
  1994年   98篇
  1993年   98篇
  1992年   62篇
  1991年   71篇
  1990年   37篇
  1989年   34篇
  1988年   31篇
  1987年   26篇
  1986年   23篇
  1985年   40篇
  1984年   25篇
  1983年   25篇
  1982年   15篇
  1981年   17篇
  1980年   14篇
  1979年   3篇
  1978年   7篇
  1977年   3篇
  1976年   2篇
  1974年   1篇
排序方式: 共有10000条查询结果,搜索用时 16 毫秒
61.

Background

Penetrating stab wounds in children are relatively rare and no clear recommendations for the optimal evaluation have been devised. An acceptable traditional approach to the patient with an abdominal stab wound who does not require urgent surgery is selective nonoperative management and serial exams. The use of routine computed tomography remains an actively utilized investigation for these patients at many institutions.

Purpose

We hypothesize that the approach to pediatric stab wound victims should be distinctly different than that of adult counterparts in order to minimize radiation exposure.

Methods

A retrospective cohort study involving abdominal stab wounds among pediatric trauma patients (age < 14) compared with adults between the years 1997 and 2016 was conducted utilizing the Israeli National Trauma Registry.

Results

A total of 92 children and 4444 adults were identified from the registry for inclusion. Among the children 20 (21.7%) patients had intraabdominal injury compared to 1730 (38.9%) among adult counterparts. Four children were hemodynamically unstable, two of them were referred directly to operating room and two others were treated without surgery. Among the remaining 88 children there was no observed mortality.

Conclusions

The majority of pediatric stab wounds trauma victims have minor abdominal injuries. We do not recommend the routine utilization of abdominal CT scan in the evaluation of abdominal stab wounds. Observation with serial exams and minimization of radiation exposure from CT are warranted in this unique population.

Type of study

Retrospective comparative study.

Level of evidence

3.  相似文献   
62.
《Surgery (Oxford)》2019,37(10):565-575
Acute gastrointestinal bleeding is a common medical emergency, accounting for approximately 85,000 admissions in the United Kingdom per annum. It is associated with significant morbidity and mortality. GI haemorrhage is commonly categorized according to source of blood loss; either upper GI (above the ligament of Treitz) or lower GI (below the ligament of Treitz). Rapid assessment, resuscitation and correction of coagulopathy should be undertaken to stabilize the haemodynamically compromised patient and definitive intervention should not be delayed. Clinicians may use of a range of treatment modalities, including endoscopic and interventional radiological techniques in order to get control of haemorrhage, which should be tailored to the site of bleeding and pathology. Where control is not achieved the clinician should consider either repeat intervention, use of alternative haemostatic techniques or different modalities to achieve haemostasis. Rarely is surgery the chosen treatment modality and surgical intervention should only be undertaken where all other measures to control haemorrhage have failed.  相似文献   
63.
Background and objectivesProcedural simulation training for difficult airway management offers acquisition opportunities. The hypothesis was that 3 hours of procedural simulation training for difficult airway management improves: acquisition, behavior, and patient outcomes as reported 6 months later.MethodsThis prospective comparative study took place in two medical universities. Second‐year residents of anesthesiology and intensive care from one region participated in 3 h procedural simulation (intervention group). No intervention was scheduled for their peers from the other region (control). Prior to simulation and 6 months later, residents filled‐out the same self‐assessment form collecting experience with different devices. The control group filled‐out the same forms simultaneously. The primary endpoint was the frequency of use of each difficult airway management device within groups at 6 months. Secondary endpoints included modifications of knowledge, skills, and patient outcomes with each device at 6 months. Intervention cost assessment was provided.Results44 residents were included in the intervention group and 16 in the control group. No significant difference was observed for the primary endpoint. In the intervention group, improvement of knowledge and skills was observed at 6 months for each device, and improvement of patient outcomes was observed with the use of malleable intubation stylet and Eschmann introducer. No such improvement was observed in the control group. Estimated intervention cost was 406€ per resident.ConclusionsA 3 h procedural simulation training for difficult airway management did not improve the frequency of use of devices at 6 months by residents. However, other positive effects suggest exploring the best ratio of time/acquisition efficiency with difficult airway management simulation.ClinicalTrials.gov IdentifierNCT02470195.  相似文献   
64.

Background

Epidemiology of patients with worsening heart failure and reduced ejection fraction (HFrEF) in the real-world setting is not well described.

Objectives

The purpose of this study was to describe incidence, clinical characteristics, treatment, and outcomes of patients with HFrEF who develop worsening heart failure (HF) in the real-world setting.

Methods

Data on patients with incident HFrEF from the National Cardiovascular Data Registry PINNACLE were linked to pharmacy, private practitioner, and hospital claims databases. Incidence, clinical characteristics, treatment (angiotensin-converting enzyme inhibitor/angiotensin receptor blocker, beta-blocker, and mineralocorticoid receptor antagonist) and outcomes of patients with worsening HF, defined as ≥90 days of stable HF with subsequent worsening requiring intravenous diuretic agents, were assessed.

Results

Of 11,064 HFrEF patients, 1,851 (17%) developed worsening HF on average 1.5 years following initial HF diagnosis. Patients who developed worsening HF were more likely to be African American, be octogenarians, and have higher comorbidity burden (p < 0.001). At the onset of worsening HF, 42.4% of patients were on monotherapy, 43.4% were on dual therapy, and 14.1% were on triple therapy. A total of 48%, 61%, and 98% of patients were on >50% target dose for angiotensin-converting enzyme inhibitor/angiotensin receptor blocker, beta-blocker, and mineralocorticoid receptor antagonist, respectively. The 2-year mortality rate was 22.5%, and 56% of patients were rehospitalized within 30 days of the worsening HF event.

Conclusions

In the real-world setting, 1 in 6 patients with HFrEF develop worsening HF within 18 months of HF diagnosis. These patients have a high risk for 2-year mortality and recurrent HF hospitalizations. The use of standard-of-care therapies both before and after the onset of worsening HF is low. With high unmet medical need, patients with worsening HF require novel treatment strategies as well as greater optimization of existing guideline-directed therapy.  相似文献   
65.
66.
67.
儿童系统性红斑狼疮(childhood-onset systemic lupus erythematosus,cSLE)是特指在18岁之前发病的系统性红斑狼疮。可累积全身多脏器、多系统,有多达60%的患儿会出现狼疮性肾炎(lupus nephritis,LN),其中19%的患儿进展为终末期肾病。感染和终末期肾病是导致发展中国家cSLE死亡的常见原因。由于疾病本身和治疗都会影响患儿的身心和生长发育,做好cSLE与LN的慢病管理对控制病情、提高长期生存率极为重要。本文总结了近年来国内外系统性红斑狼疮慢病管理的经验,并对cSLE与LN慢病管理和治疗进展进行综述,旨在提高治疗达标率,减少疾病复发及并发症的发生,使患儿获益。  相似文献   
68.
IntroductionEwing sarcoma (EWS) is a highly malignant tumor of bone and soft tissue that occasionally arises from viscera. Visceral EWS (V-EWS) is challenging to manage given its varied organ distribution and often late-stage presentation. We aimed to characterize our institutional experience with V-EWS, focusing on its surgical management, and to compare V-EWS outcomes against those with osseous (O-EWS) and soft tissue EWS (ST-EWS).MethodsRetrospective review of all EWS patients ≤21 years presenting to a single institution between 2000 and 2022. Patient- and disease-specific characteristics were compared. Overall and relapse-free survival were estimated using Kaplan Meier methods and log-rank test.Results156 EWS patients were identified: 117 O-EWS, 20 ST-EWS, and 19 V-EWS. V-EWS arose in the kidney (n = 5), lung (n = 5), intestine (n = 2), esophagus (n = 1), liver (n = 1), pancreas (n = 1), adrenal gland (n = 1), vagina (n = 1), brain (n = 1), and spinal cord (n = 1). No significant demographic differences were detected between EWS groups. V-EWS was more frequently metastatic at presentation (63.2%; p = 0.005), yet no significant overall or relapse-free survival differences emerged between EWS groups, with similar follow-up intervals. While V-EWS required multiple unique operative strategies to gain primary control, no significant difference in treatment strategies appeared between groups. Surgery-only primary control was associated with improved overall and relapse-free survival in all groups.ConclusionsV-EWS presents unique management challenges in children and adolescents given its variable sites of origin. This large cohort is the first to describe the surgical management and outcomes of V-EWS, demonstrating more frequent metastatic presentation, while achieving similar survival across groups.Level of evidenceLevel 2 – Cohort Study.  相似文献   
69.
唐娇  胡霞  刘敏豪  邓肖云 《全科护理》2022,20(5):657-660
目的:探究SHEL模式下基层医院护理人员高警示药品安全管理培训的效果。方法:选取2020年7月—2021年6月在医院从事临床护理工作的80名护理人员,随机将其分为观察组与对照组各40人。对照组实施常规培训模式,观察组实施SHEL模式培训,比较两组护理人员高警示药品相关知识及技能掌握程度、意外事件发生率及核心能力。结果:培训后观察组护理人员理论及操作得分分别为(86.75±6.18)分及(93.19±4.28)分,核心能力得分为(228.98±8.37)分,均明显高于对照组(P<0.05),同时观察组护理人员在护理过程中出现给药前未双人核对、药品分类不清及交接记录不全的概率分别为0.95%、0.95%及1.90%,明显低于对照组(P<0.05),且未出现药物外渗及滴速有误等情况。结论:对基层医院护理人员实施SHEL模式下高警示药品安全管理培训,能够有效提高护理人员高警示药品理论、技能掌握程度及核心能力,同时有助于降低护理工作中意外事件的发生概率。  相似文献   
70.
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