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   19020篇
  免费   1224篇
  国内免费   91篇
耳鼻咽喉   55篇
儿科学   637篇
妇产科学   162篇
基础医学   2953篇
口腔科学   78篇
临床医学   3485篇
内科学   1180篇
皮肤病学   97篇
神经病学   3535篇
特种医学   207篇
外科学   546篇
综合类   2032篇
现状与发展   1篇
一般理论   10篇
预防医学   4030篇
眼科学   21篇
药学   866篇
  3篇
中国医学   251篇
肿瘤学   186篇
  2023年   354篇
  2022年   473篇
  2021年   708篇
  2020年   744篇
  2019年   705篇
  2018年   677篇
  2017年   627篇
  2016年   697篇
  2015年   598篇
  2014年   1230篇
  2013年   1561篇
  2012年   1190篇
  2011年   1404篇
  2010年   1002篇
  2009年   1109篇
  2008年   1136篇
  2007年   1132篇
  2006年   888篇
  2005年   598篇
  2004年   531篇
  2003年   438篇
  2002年   339篇
  2001年   333篇
  2000年   224篇
  1999年   191篇
  1998年   151篇
  1997年   138篇
  1996年   103篇
  1995年   97篇
  1994年   86篇
  1993年   78篇
  1992年   63篇
  1991年   56篇
  1990年   61篇
  1989年   39篇
  1988年   44篇
  1987年   32篇
  1986年   45篇
  1985年   57篇
  1984年   53篇
  1983年   28篇
  1982年   38篇
  1981年   46篇
  1980年   35篇
  1979年   33篇
  1978年   23篇
  1977年   45篇
  1976年   24篇
  1975年   17篇
  1974年   17篇
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
目的 了解芦山地震5年后雅安市高血压患者心理卫生问题检出率及其影响因素,为促进地震灾区高血压患者心理健康提供参考。方法 采用分层整群随机抽样方法,于2018年12月选取雅安市高血压患者800例作为研究对象。采用自编居民基本信息调查表收集患者的基本资料,采用12项一般健康问卷(GHQ-12)评定患者近期是否存在心理卫生问题,采用Logistic回归分析其影响因素。结果 回收有效问卷744份(93.00%),检出存在心理卫生问题者79例(10.62%)。单因素分析结果显示,不同婚姻状况(P?0.01)、家庭人均月收入(P=0.012)、是否接受社会救助(χ2=25.194,P?0.01)的高血压患者心理卫生问题检出率差异均有统计学意义。Logistic回归分析显示,未婚/分居/离异/丧偶(OR=3.879,P=0.015)以及接受社会救助(OR=4.705,P?0.01)是高血压患者存在心理卫生问题的危险因素。结论 雅安市高血压患者心理卫生问题检出率较低,未婚/分居/离异/丧偶者以及接受社会救助的高血压患者心理卫生问题可能更突出。  相似文献   
2.
目的 调查川东北地区各组织机构开展社会心理服务的现状以及居民的心理健康状况,为该地区社会心理服务体系建设工作的进一步开展提供参考。方法 采用自编调查表对巴中市通江县、广元市利州区、达州市大竹县共计148家组织机构进行调查,包括各组织机构社会心理服务体系建设工作现状及心理健康服务开展情况;采用患者健康问卷抑郁量表(PHQ-9)、广泛性焦虑障碍量表(GAD-7)和自编心理健康服务需求调查表,对三地试点地区21 505名居民的心理健康状况及其对心理服务的需求进行调查。结果 在试点地区148家组织机构中,81家(54.7%)机构有开展心理健康服务的场所,58家(39.2%)机构配备了专兼职心理健康服务工作人员。在2019年,有95家(64.2%)机构开展了职工心理健康服务活动,104家(70.3%)机构开展了心理健康科普宣传活动。在75家教育机构中,67家(89.3%)机构对学生开展了心理健康教育活动,47家(62.7%)机构实现了心理健康课程在学生中全覆盖。居民的抑郁、焦虑检出率分别为36.8%和30.8%,有83.7%的居民有心理健康服务的需求,主要集中在个人成长、婚姻家庭、子女教育和压力管理方面。结论 川东北三市试点地区的社会心理服务工作有序进行,场地、经费及人才保障有待进一步加强。居民的抑郁和焦虑问题较突出,且对心理健康服务的需求较高。  相似文献   
3.
4.
背景严重精神障碍患者因自知力欠缺及高复发性、高致残性等特点,对社会稳定造成严重威胁。做好社区面访管理工作意义重大,通过定期面访患者本人,可以更好地综合评估患者病情,以便及时采取措施,提高管理服务质量。目的了解社区严重精神障碍患者规律面访情况及其影响因素,为提高社区患者的面访服务管理质量提供参考依据。方法2020年10—12月,利用2019年底江苏省严重精神障碍管理系统中建档管理的无锡市严重精神障碍患者基础档案及随访管理信息,分析当年度无锡市社区严重精神障碍患者规律面访情况,采用Logistic回归分析规律面访的影响因素。结果共纳入27 778例研究对象,其规律面访率为81.08%(22 523/27 778)。Logistic回归分析结果显示,非本地户籍〔OR(95%CI)=0.704(0.640,0.775)〕、年龄≤44岁〔OR(95%CI)=0.522(0.472,0.578)〕、学历为高中及以上〔高中/中专OR(95%CI)=0.493(0.446,0.545),大专及以上OR(95%CI)=0.470(0.415,0.532)〕、目前有正式工作〔OR(95%CI)=0.715(0.668,0.766)〕、未婚〔OR(95%CI)=0.746(0.665,0.838)〕、经济状况为非贫困〔OR(95%CI)=0.587(0.517,0.666)〕、没有进行抗精神病药物治疗〔OR(95%CI)=0.491(0.440,0.548)〕、服药时长0~10年〔OR(95%CI)=0.881(0.778,0.998)〕、不是"以奖代补"监护补助对象〔OR(95%CI)=0.807(0.704,0.926)〕、不参加社区康复服务〔OR(95%CI)=0.844(0.716,0.996)〕是患者规律面访的消极影响因素(P<0.05)。结论无锡市社区严重精神障碍患者规律面访率尚需进一步提高,应重点关注非本地户籍、年龄≤44岁、高中及以上学历、目前有正式工作、未婚、经济非贫困、没有进行抗精神病药物治疗、服药时长0~10年、不是监护补助对象和不参加社区康复服务的社区严重精神障碍患者。可通过制定倾斜性政策、开展宣传教育、降低患者病耻感、改善患者疾病认知、加强患者社会支持等措施提高患者规律面访率。  相似文献   
5.
6.
7.
8.
9.

Background

Weaning from mechanical ventilation and tracheostomy after prolonged intensive care consume enormous resources with optimal management not currently well described. Restoration of respiratory flow via the upper airway is essential and early cuff-deflation using a one-way valve (OWV) is recommended. However, extended OWV use may cause dry airways and thickened secretions which challenge the weaning process. High-flow therapy via the tracheostomy tube (HFT-T) humidifies inspired air and may be connected via an in-line OWV (HFT-T-OWV) alleviating these problems. We aim to provide clinical and experimental data on the safety of HFT-T-OWV along with a practical guide to facilitate clinical use during weaning from mechanical ventilation and tracheostomy.

Methods

Data on adverse events of HFT-T-OWV were retrieved from a quality register for patients treated at an intensive care rehabilitation center between 2019 and 2022. Benchtop experiments were performed to measure maximum pressures and pressure support generated by HFT-T-OWV at 25–60 L/min flow using two different HFT-T adapters (interfaces). In simulated airway obstruction using a standard OWV (not in-line) maximum pressures were measured with oxygen delivered via the side port at 1–3 L/min.

Results

Of 128 tracheostomized patients who underwent weaning attempts, 124 were treated with HFT-T-OWV. The therapy was well tolerated, and no adverse events related to the practice were detected. The main reason for not using HFT-T-OWV was partial upper airway obstruction using a OWV. Benchtop experiments demonstrated HFT-T-OWV maximum pressures <4 cmH2O and pressure support 0–0.6 cmH2O. In contrast, 1–3 L/min supplemental oxygen via a standard OWV caused pressures between 84 and 148 cmH2O during simulated airway obstruction.

Conclusions

Current study clinical data and benchtop experiments indicate that HFT-T-OWV was well tolerated and appeared safe. Pressure support was low, but humidification may enable extended use of a OWV without dry airway mucosa and thickened secretions. Results suggest the treatment could offer advantages to standard OWV use, with or without supplementary oxygen, as well as to HFT-T without a OWV, for weaning from mechanical ventilation and tracheostomy. However, for definitive treatment recommendations, randomized clinical trials are needed.  相似文献   
10.

Introduction

Left ventricular (LV) dysfunction is estimated to occur in 10%–25% of the general intensive care unit (ICU) population and is frequently seen as regional wall motion abnormalities (RWMAs). Although RWMA is mostly attributed to myocardial ischemia or infarction, some studies have suggested that nonischemic RWMA might also be prevalent. We sought to establish that RWMA can be seen in critically ill patients with normal coronary arteries and to explore reasons for RWMA in this population.

Methods

In this retrospective study, data from the hospital angiography register and the ICU register were collated between 2012 and 2019. Patients were identified who underwent angiography in conjunction with their ICU stay and had RWMA on echocardiography. Patients were divided into either those with non-obstructed or those with obstructed coronary arteries. Cardiac magnetic resonance imaging (cMRI) examinations were reviewed if they had been performed on patients with non-obstructed coronaries.

Results

We identified 53 patients with RWMA and non-obstructed coronary arteries and 204 patients with RWMA and obstructed coronary arteries. Patients with non-obstructed coronary arteries were more often female, younger, and had fewer cardiovascular risk factors. They less commonly had ST elevation, but more frequently had T-wave inversion or serious arrhythmias. Troponin levels were higher in patients with obstructed coronary arteries, but NT-proBNP was similar between the groups. There were no differences in risk-adjusted 90-day mortality between patients with non-obstructed versus obstructed coronary arteries (OR 1.21, [95% CI 0.56–2.64], p = .628). In those with non-obstructed coronary arteries, follow-up echocardiography was available for 38 patients, of whom 30 showed normalization of cardiac function. Of the 14 patients with non-obstructed coronary arteries on whom cMRI was performed, 7 had a tentative diagnosis of Takotsubo syndrome or myocardial stunning; 4 had a myocardial infarction (preexisting in 3 cases); 1 patient had acute myocarditis; 1 patient had post-myocarditis; and 1 patient was diagnosed with dilated cardiomyopathy.

Conclusion

RWMA can be seen to occur in critically ill patients in the absence of coronary artery obstruction. Several conditions can cause regional hypokinesia, and cMRI is useful to evaluate the underlying etiology.  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