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Exploring What Lies Ahead in the Field of Disinfecting Coronavirus 探索冠状病毒消毒领域的未来
Pub Date : 2021-05-06 DOI: 10.4236/OALIB.1107487
D. Ghernaout, N. Elboughdiri
Recently, huge awareness has been accorded to potential circulation of SARS- CoV-2 through water systems. This work deals with this problem and researches the behavior of coronaviruses (CoVs) in water media, with specific interest on the new data on the fresh SARS-CoV-2. The examination of the natural persistence of CoVs and the performance of the disinfection technologies are also discussed. All CoVs have a restricted stability in water media: 2 - 5 days in tap water and 2 - 6 days in wastewater were judged enough for 2-log reduction of SARS-CoV-2 titer. SARS-CoV-2 is distinguished by a weak construction and is vulnerable to traditional disinfection technologies that have been demonstrated to be very efficient in their neutralization. Approximately 5 min of exposure to sodium hypochlorite (1%), ethanol (70%), iodine (7.5%), soap solution and additional usual disinfectants was enough for reaching 7 - 8-log of SARS-CoV-2 titer decrease. Thermal treatment is efficacious in SARS-CoV-2 demobilization: 30 min at 56 or 5 min at 70°C were enough for attaining the total depletion of the infectivity. Further, SARS-CoV-2 remains vulnerable to sunlight and quickly demobilized by UV radiation. UV-C at 254 nm and intensity of 2.2 mW/cm2 yields 3-log of SARS-CoV-2 titer decrease in less than 3 s of application. Consequently for SARS-CoV-2 disinfection, usual injections of killing agents remain required for sanitation and for wastewater treatment. Relating to controlling CoVs diffusion and applying disinfection technologies, vigilance remains essential.
最近,人们对SARS- CoV-2可能通过水系统传播产生了极大的认识。这项工作解决了这一问题,并研究了冠状病毒(cov)在水介质中的行为,特别关注新鲜SARS-CoV-2的新数据。还讨论了冠状病毒自然持久性的检验和消毒技术的性能。所有冠状病毒在水介质中都具有有限的稳定性:在自来水中2- 5天和在废水中2- 6天被认为足以使SARS-CoV-2滴度降低2倍。SARS-CoV-2的特点是结构薄弱,容易受到传统消毒技术的影响,而传统消毒技术已被证明在中和方面非常有效。暴露于次氯酸钠(1%)、乙醇(70%)、碘(7.5%)、肥皂溶液和其他常用消毒剂约5分钟,足以使SARS-CoV-2滴度下降7 - 8 log。热处理在SARS-CoV-2复员中是有效的:在56°C下30分钟或在70°C下5分钟足以达到完全耗尽传染性。此外,SARS-CoV-2仍然容易受到阳光的影响,并会在紫外线辐射下迅速复原。在254 nm和2.2 mW/cm2强度的UV-C照射下,在不到3秒的时间内,SARS-CoV-2滴度降低了3倍。因此,对于SARS-CoV-2的消毒,仍然需要通常注射杀灭剂来进行卫生和废水处理。在控制冠状病毒扩散和应用消毒技术方面,保持警惕仍然至关重要。
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引用次数: 3
Study of Malt Bagasse Biomass as Biosorbent for Acetic Acid Removal in Effluents 麦芽甘蔗渣生物质作为生物吸附剂去除废水中乙酸的研究
Pub Date : 2021-05-06 DOI: 10.4236/OALIB.1107478
Thiago Reixach Pires de Souza, Wilson Sacchi Peternella
In the present work, the biomass known as the malt bagasse, a by-product of the brewing industry, was studied as a biosorbent of acetic acid, in order to evaluate its potential use as an ion exchanger in effluent treatment systems. The process is based on the phenomenon of biosorption, an interface phenomenon, which is the natural accumulation of a solute on the surface of a solid. The studied phenomenon is that of acetic acid adsorption in malt bagasse biomass. In the present work, the influence test of the biomass quantity was carried out, and it was verified that 40 g/L is the ideal concentration of malt bagasse in the acetic acid adsorption process. A kinetic study was also carried out, where a contact time of 20 minutes was defined to reach the balance between the solid/liquid phase. In the identification of the pseudo-second order kinetic model, it was the one that best fitted the experimental data, and based on the intra-particle diffusion model, it was found that more than one step comprises the biosorption mechanism, with intra-particle diffusion being limiting step. Based on this information, the chemical equilibrium test of the solid/liquid phase was performed using the mathematical models of Langmuir and Freundlich, thus presenting, for the malt bagasse, a maximum acetic acid adsorption capacity of approximately 30 mg/g. Where experimental data best fit the Langmuir isotherm. The results show a significant potential for the malt bagasse to remove organic acid in effluents.
在目前的工作中,被称为麦芽甘蔗渣的生物质,酿造工业的副产品,被研究作为醋酸的生物吸附剂,以评估其在污水处理系统中作为离子交换剂的潜在用途。该过程基于生物吸附现象,这是一种界面现象,是溶质在固体表面的自然积累。研究的现象是麦芽甘蔗渣生物质对乙酸的吸附。在本工作中,进行了生物质量的影响试验,验证了40 g/L是麦芽甘蔗渣在醋酸吸附过程中的理想浓度。还进行了动力学研究,其中定义了20分钟的接触时间,以达到固/液相之间的平衡。在拟二级动力学模型的鉴定中,该模型与实验数据拟合最好,并基于颗粒内扩散模型,发现生物吸附机理包含多个步骤,其中颗粒内扩散是限制步骤。在此基础上,利用Langmuir和Freundlich数学模型进行了固/液相化学平衡测试,得出麦芽甘蔗渣对乙酸的最大吸附量约为30 mg/g。实验数据最符合朗缪尔等温线的地方。结果表明,麦芽甘蔗渣对废水中的有机酸具有较大的去除潜力。
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引用次数: 0
Exploring the Link between Organizational Learning and Transformational Leadership: A Review 探索组织学习与变革型领导的关系:综述
Pub Date : 2021-05-06 DOI: 10.4236/OALIB.1107242
I. Mohamed, N. M. M. Otman
This study highlights the relation between organizational learning and transformational leadership, recognizes the significance of transformational leadership and explores its association with organizational learning. Organizations can become more competitive by bridging the gap between the existing transformational leadership talents, skills and the organizational learning levels based on the leaders’ commitment and dedication that gives a new life to an organization. Some leaders have better capabilities and capacities to make their organizations more competitive as compared to others, and they do so by focusing on important factors, which improve organizational learning. Their aim is reinforcement of transformational leadership and improving the organizational members’ learning processes and competences to help them adapt to changes taking place in the business environment for achieving learning that results in organizational excellence. For exploring learning issues, results mentioned in the previous literature indicate that a positive relation exists between organizational learning and transformational leadership, while the former directly affects the development of creativity, skills, innovation, and capabilities.
本研究强调组织学习与变革型领导的关系,承认变革型领导的重要性,并探讨其与组织学习的关系。通过弥合现有的变革型领导才能、技能和组织学习水平之间的差距,组织可以变得更有竞争力,这是基于领导者的承诺和奉献精神,给组织带来了新的生命。一些领导者有更好的能力和能力,使他们的组织比其他人更有竞争力,他们这样做是通过关注重要因素,这提高了组织的学习。他们的目标是加强变革型领导,改善组织成员的学习过程和能力,帮助他们适应商业环境中发生的变化,实现学习,从而实现组织卓越。在探索学习问题方面,以往文献的研究结果表明,组织学习与变革型领导之间存在正相关关系,变革型领导直接影响创造力、技能、创新和能力的发展。
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引用次数: 9
Characteristics and Significance of X-Ray Fluorescence Anomaly of Granite Pegmatite Rare Metal Deposit in Renli, Hunan 湖南仁礼花岗伟晶岩稀有金属矿床x射线荧光异常特征及意义
Pub Date : 2021-05-06 DOI: 10.4236/OALIB.1107467
Longju Zhang
In the granite pegmatite niobium-tantalum rare metal mining area in Renli, Pingjiang County, Hunan Province, the multi-element X-ray fluorescence measurement of soil was carried out using a handheld X-ray fluorometer on three survey lines passing through known veins. The element combination and amplitude of the mineral-induced X-ray fluorescence anomaly and the spatial correlation between mineral-induced anomalies and the ore body are studied. The results show that there are positive anomalies of K, Nb, Ta, Rb, Y, and negative anomalies (or low-value areas) of Fe, Ni, Zn, and Zr at the outcropping site or above the outcropping projection site. Therefore, the abnormal X fluorescence of the target elements Nb, Ta, Rb, and the abnormal multi-element X fluorescence accumulation ratio of (Nb + Ta + Rb + Y)/(Fe + Ni + Sr + Zr) can be used as the basis for quickly evaluating the minerality of granite pegmatite veins.
在湖南省平江县仁礼花岗岩伟晶岩铌钽稀有金属矿区,利用手持式x射线荧光仪对三条穿过已知矿脉的测量线进行了土壤多元素x射线荧光测量。研究了矿致x射线荧光异常的元素组合、幅值以及矿致异常与矿体的空间相关性。结果表明:露头部位及露头投影部位以上存在K、Nb、Ta、Rb、Y正异常,Fe、Ni、Zn、Zr负异常(或低值区);因此,靶元素Nb、Ta、Rb的X荧光异常及(Nb + Ta + Rb + Y)/(Fe + Ni + Sr + Zr)的多元素X荧光异常累积比可作为快速评价花岗岩辉晶岩脉矿物性的依据。
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引用次数: 0
Monetary Policy Experiments in an Agent-Based Macroeconomic Model 基于主体的宏观经济模型中的货币政策实验
Pub Date : 2021-05-06 DOI: 10.4236/OALIB.1107471
Elder Mauricio Silva, G. V. Moura, Sergio Da Silva
We consider an interbank market and a central bank in an agent-based macroeconomic model with credit and capital to evaluate the effects of monetary policies—conventional and quantitative easing. We find quantitative easing outperforms Taylor’s rule-style policies in smoothing out the business cycle.
我们考虑银行间市场和中央银行在一个基于主体的宏观经济模型与信贷和资本,以评估货币政策的影响-传统和量化宽松。我们发现量化宽松在平滑商业周期方面优于泰勒的规则式政策。
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引用次数: 2
Nursing Care in the Functional Disabilities of the Elderly in Primary Health Care: Systematic Review with Meta-Synthesis 初级卫生保健中老年人功能障碍的护理:meta -综合的系统综述
Pub Date : 2021-05-06 DOI: 10.4236/OALIB.1107431
Ana Gracinda Ignácio da Silva, Maria Bárbara Freire Lameira, Joseba Campos, L. A. Neri, J. C. Garcez, Gabriel Fazzi Costa, Maria Rute de Souza Araújo, Milena Farah Damous Castanho Ferreira, D. Sardinha
When considering the elderly, we must realize the profound particularities in their daily lives, because the elderly has vulnerabilities that result from the aging process. This study aims to develop a systematic review followed by meta-synthesis based on the findings of qualitative primary scientific research, on nursing care in the face of Functional Incapacity of the Elderly in Primary Health Care starting with the research question: How does the nursing care process for elderly people with functional incapacity occur in primary health care? This is a systematic literature review with the elaboration of meta-synthesis. The search for the articles occurred in the databases of the Regional Portal VHL (Virtual Health Library); Brazilian Digital Library of Theses and Dissertations (BDTD); PubMed, Science Direct, and Google Scholar. The sample consisted of seven original articles of qualitative methodology, one of which was a mixed method. Data analysis followed the guidance of content analysis. The thematic category was identified: The process of nursing care for elderly patients with functional incapacity focuses on primary health care. It was concluded that nurses take care of elderly people with functional incapacity in the basic health unit, at home and in nursing homes, evaluating, planning, and implementing activities that prevent risks, treat complaints and integrate these elderly people into community projects. This care is performed through nursing consultation, integrated into programs, and using tools and protocols.
在考虑老年人时,我们必须认识到他们日常生活中的深刻特殊性,因为老年人在老龄化过程中具有脆弱性。本研究旨在以质性初级科学研究成果为基础,以“初级卫生保健中老年人功能丧失能力的护理过程是如何发生的”为研究问题,对初级卫生保健中老年人功能丧失能力的护理进行系统回顾和meta综合。这是一个系统的文献综述与元综合的阐述。在区域门户网站VHL(虚拟健康图书馆)的数据库中搜索文章;巴西数字论文图书馆(BDTD);PubMed, Science Direct和b谷歌Scholar。样本由7篇定性方法论的原创文章组成,其中一篇为混合方法。数据分析以内容分析为指导。确定了主题类别:对功能丧失能力的老年患者的护理过程侧重于初级保健。结论是,护士在基本保健单位、家中和养老院照顾有功能障碍的老年人,评估、规划和实施预防风险、处理投诉并将这些老年人纳入社区项目的活动。这种护理是通过护理咨询,整合到项目中,并使用工具和协议来执行的。
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引用次数: 0
Research on the Application of the Teaching Mode of “Integration of Competition, Certification and Training” in Cross-Border E-Commerce Course Teaching—Take Zhejiang Jinhua Vocational College of Science and Trade as an Example “赛、证、训一体化”教学模式在跨境电子商务课程教学中的应用研究——以浙江金华科贸职业学院为例
Pub Date : 2021-05-06 DOI: 10.4236/OALIB.1107448
Hongyan Wang
Cross-border e-commerce has become an important development mode of international trade, and the gap of cross-border e-commerce talents is very large. However, there are many bottlenecks in cross-border e-commerce teaching in higher vocational colleges. The teaching mode of “integration of competition, certificate and training” refers to improving students’ professional ability by participating in actual combat training and competitions related to their major. The author led her teaching team to apply and research the teaching mode of “integration of competition, certificate and training” in the teaching of cross-border e-commerce courses, and obtained some results for reference. This paper is the achievement of the general topic of the second batch of teaching reform research project (Zhejiang Provincial Department of Education JG20191068) in Zhejiang Province “13th Five-Year Plan”.
跨境电商已经成为国际贸易的重要发展方式,跨境电商人才缺口非常大。然而,高职院校跨境电子商务教学存在诸多瓶颈。“赛、证、训一体化”的教学模式是指通过参加与专业相关的实战训练和比赛,提高学生的专业能力。笔者带领教学团队对“赛、证、训一体化”的教学模式在跨境电子商务课程教学中进行了应用和研究,并取得了一些值得借鉴的成果。本文是浙江省“十三五”规划第二批教学改革研究项目(浙江省教育厅JG20191068)总课题的成果。
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引用次数: 1
Clinical Analysis of 76 Cases of Differentiated Thyroid Isthmic Carcinoma after Operation 分化型甲状腺峡部癌术后76例临床分析
Pub Date : 2021-05-06 DOI: 10.4236/OALIB.1107350
K. Xiang, Changfeng Zhang, Shunlin Zhao
Objective: To investigate the clinicopathological features and surgical treatment of differentiated thyroid isthmus carcinoma. Methods: The clinical data of 76 patients with differentiated thyroid isthmus cancer diagnosed and operated in our hospital from January 2015 to January 2019 were retrospectively analyzed. Results: 16 cases of single focus, 60 cases with unilateral or bilateral multiple lesions, 76 patients. Bilateral thyroidectomy and bilateral CLN dissection were performed in 57 cases, unilateral thyroidectomy plus isthmus resection plus lateral total resection and bilateral central lymph node dissection in 17 cases. 2 cases underwent bilateral thyroidectomy plus bilateral CLN dissection plus unilateral neck lateral lymph node dissection. Lymph node metastasis occurred in 42 cases and lymph node metastasis in 40 cases, including 16 cases of unilateral central lymph node metastasis, 24 cases of bilateral central lymph node metastasis, and 2 cases with lateral cervical lymph node metastasis. 16 cases of single isthmus thyroid cancer, unilateral CLNM in 7 cases (43.75%), bilateral CLNM in 4 cases (25%), no metastasis in 5 cases (31.25%), and no lateral lymph node metastasis. Hypocalcemia occurred in 7 cases and temporary hoarseness occurred in 3 cases, which returned to normal within 3 - 6 months. All 76 patients were followed up. No permanent hypoparathyroidism, cervical lymph node recurrence, distant metastasis or death occurred in all patients. Conclusion: The treatment of differentiated thyroid isthmic carcinoma should be based on the pathological diagnosis, with bilateral thyroidectomy and bilateral CLN dissection as the main treatment. For patients with single focus, diameter ≤ 1 cm and low-risk group, if the above reasons are excluded, isthmus + unilateral gland resection and bilateral central lymph node dissection are feasible.
目的:探讨分化型甲状腺峡部癌的临床病理特点及手术治疗方法。方法:回顾性分析我院2015年1月至2019年1月诊断并手术的分化型甲状腺峡癌76例患者的临床资料。结果:单发病灶16例,单侧或双侧多发病灶60例,76例。行双侧甲状腺切除术+双侧CLN清扫57例,单侧甲状腺切除术+峡部切除+外侧全切除术+双侧中央淋巴结清扫17例。2例行双侧甲状腺切除术+双侧CLN清扫+单侧颈部外侧淋巴结清扫。42例发生淋巴结转移,40例发生淋巴结转移,其中单侧中央淋巴结转移16例,双侧中央淋巴结转移24例,颈侧淋巴结转移2例。单侧峡部甲状腺癌16例,单侧CLNM 7例(43.75%),双侧CLNM 4例(25%),无转移5例(31.25%),无外侧淋巴结转移。7例出现低钙血症,3例出现暂时性声音嘶哑,3 ~ 6个月恢复正常。76例患者均接受随访。所有患者均无永久性甲状旁腺功能减退、颈部淋巴结复发、远处转移或死亡。结论:分化型甲状腺峡部癌的治疗应以病理诊断为基础,以双侧甲状腺切除术和双侧CLN清扫为主要治疗方法。对于单灶、直径≤1 cm的患者及低危组,若排除上述原因,可采用峡部+单侧腺体切除及双侧中央淋巴结清扫术。
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引用次数: 0
Effect of Feeding Graded Levels of Acid Soaked Cajanus cajan Seed on Carcass Characteristics and Organ Weight Changes of Broiler Finisher 酸浸Cajanus籽饲喂分级水平对肉鸡育肥猪胴体性状和器官重量变化的影响
Pub Date : 2021-05-06 DOI: 10.4236/OALIB.1107072
H. Amusa, S. D. Ogungbenro, T. Makanju, O. Okunlola, T. Adeoti, T. Oseni, I. A. Adebisi, F. L. Amusa
A total of (90) day old broilers were used for the study to determine the carcass characteristics and organ weight changes of broiler finisher fed graded levels of acid soaked Cajanus cajan seed meal diet. The birds were randomly assigned into 3 dietary treatments of 30 birds consisting of 3 replicates of (10) birds per replicates in a completely randomized design experiment. The seeds used were purchased from Towobowo market in Igboora. The raw pigeon pea seeds were pre-treated by soaking at the rate of 1 kg/3L of water for 12 hours after which the soaked seeds were soaked at the rate of 1 kg/3L of raw pap water filtrate for 24 hours, initial and final pH was taken. The sample was sundried for 3 days, milled and then included in the diet accordingly. Birds on T1 received the control diet, T2 received 10% level of processed pigeon pea, while T3 received 20% level of processed pigeon pea. The experiment lasted for eight weeks. At the end of the 8 weeks feeding trial, three (3) birds per treatment were sacrificed for carcass analysis and internal organs were harvested to determine the weight changes in the internal organs. Results showed that there was significant (P > 0.05) difference in the live weight, dress weight, plugged weight, dressing percentage, neck, wing, breast muscle, thigh, drum stick and shank. However, there was no significant (P 0.05) in liver, lungs, spleen, kidney, bile, GIT weight, open gizzard, empty gizzard, Proventriculus and GIT length and there was no significant (P < 0.05) difference in live weight and heart. Birds on T2 had the highest value of liver (2.15%), lungs (0.56%), GIT weight (4.72%) and GIT length (5.53%) while birds on T3 had the lowest value of liver (1.84%), lungs (0.37%), GIT weight (4.01%). It can be concluded that pigeon pea soaked in acidic medium can be fed to birds without having any negative effect on carcass characteristics and organ weight changes of broiler finisher.
本试验以90日龄肉鸡为试验对象,研究饲喂不同水平酸浸Cajanus籽粕饲粮后肉鸡胴体特性和器官重量的变化。试验采用完全随机设计,随机分为3个饲粮处理,每组30只,每组3个重复,每个重复10只。所使用的种子是从伊博拉的Towobowo市场购买的。以1 kg/3L水浸泡12小时预处理生鸽豆种子,再以1 kg/3L生鸽豆水滤液浸泡24小时,测定初始pH值和终pH值。样品干燥3 d,研磨后加入日粮。T1组饲喂对照饲粮,T2组饲喂10%水平的鹰嘴豆,T3组饲喂20%水平的鹰嘴豆。实验持续了8周。8周饲养结束时,每个处理处死3只禽鸟进行胴体分析,取内脏,测定内脏重量变化。结果表明:活重、屠宰重、塞重、屠宰率、颈部、翅膀、胸肌、大腿、鼓棒和小腿的屠宰率差异显著(P > 0.05)。肝、肺、脾、肾、胆汁、胃肠道重量、开囊、空囊、前心室、胃肠道长度差异无统计学意义(P < 0.05),活重和心脏差异无统计学意义(P < 0.05)。T2组的肝脏(2.15%)、肺(0.56%)、胃肠道重量(4.72%)和胃肠道长度(5.53%)值最高,T3组的肝脏(1.84%)、肺(0.37%)和胃肠道重量(4.01%)值最低。由此可见,在酸性培养基中浸泡的鸽豆可以饲喂禽类,对肉鸡育肥肉的胴体特性和器官重量变化没有负面影响。
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引用次数: 0
Hemophagocytic Lymphohistiocytosis Secondary to Varicella Zoster with Acute Liver Failure 水痘带状疱疹并发急性肝衰竭继发的噬血细胞性淋巴组织细胞增多症
Pub Date : 2021-05-06 DOI: 10.4236/OALIB.1107367
S. Ramasundram, Chong Kah Kian
Hemophagocytic lymphohistiocytosis (HLH) is an aggressive and life threatening syndrome of excessive immune activation. This condition can be inherited or secondary to other diseases. The therapeutic success is directly related to the rapid diagnosis with the patient who has high clinical suspicious index such as febrile illness with cytopenia, liver enzyme derangement, raised serum ferritin and low fibrinogen levels. Infection is a common trigger both in those with a genetic predisposition and in sporadic cases. We report a 31 years old man who presented with diagnosis of severe varicella zoster infection with multiorgan involvement. The laboratory data showed thrombocytopenia, an elevated level of the liver transaminases and coagulopathy. Antiviral therapy along with supportive treatment initiated. However the general condition deteriorated and he eventually required mechanical ventilation with intensive care unit support. He had persistent high spiking temperature, acute liver failure and raised serum ferritin. With the history of steroid contained health supplements ingestion prior to current hospitalization leading to immunosuppressed state, HLH was diagnosed and treatment was directed towards suppressing the overt immune response. Dexamethasone is chosen here because it can cross the blood brain barrier and tapered over the eight week induction. He responded well to treatment and discharged home.
噬血细胞性淋巴组织细胞增多症(HLH)是一种侵袭性和威胁生命的过度免疫激活综合征。这种情况可以遗传或继发于其他疾病。治疗成功与否直接关系到对临床疑点较高的发热性疾病伴细胞减少、肝酶紊乱、血清铁蛋白升高、纤维蛋白原水平低等患者的快速诊断。感染是遗传易感性和散发病例的常见诱因。我们报告一个31岁的男子谁提出诊断严重水痘带状疱疹感染与多器官受累。实验室数据显示血小板减少症,肝转氨酶水平升高和凝血功能障碍。开始抗病毒治疗和支持性治疗。然而,一般情况恶化,他最终需要机械通气和重症监护病房支持。他有持续的高峰值温度,急性肝功能衰竭和血清铁蛋白升高。由于在目前住院之前摄入含有类固醇的健康补充剂导致免疫抑制状态,因此诊断出HLH,并针对抑制显性免疫反应进行治疗。这里选择地塞米松是因为它可以穿过血脑屏障并且在诱导的八周内逐渐减少。他对治疗反应良好,出院回家了。
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引用次数: 0
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