A Markov Chain based method for generating long-range dependence

This paper describes a model for generating time series which exhibit the statistical phenomenon known as long-range dependence (LRD). A Markov Modulated Process based upon an infinite Markov chain is described. The work described is motivated by applications in telecommunications where LRD is a known property of time-series measured on the internet. The process can generate a time series exhibiting LRD with known parameters and is particularly suitable for modelling internet traffic since the time series is in terms of ones and zeros which can be interpreted as data packets and inter-packet gaps. The method is extremely simple computationally and analytically and could prove more tractable than other methods described in the literatureComment: 8 pages, 2 figure

“Keep it simple”: older African Americans’ preferences for a health literacy intervention in HIV management

Carrie Ann Gakumo,1 Comfort C Enah,1 David E Vance,1,2 Efe Sahinoglu,3 Jim L Raper1,3,4 1School of Nursing, 2Center for Nursing Research, 3School of Medicine, 41917 HIV/AIDS Outpatient Clinic, University of Alabama at Birmingham, Birmingham, AL, USA Purpose: Health literacy is lower in minorities and older adults, and has been associated with nonadherence to medications, treatment, and care in people living with human immunodeficiency virus (HIV). Likewise, African Americans with HIV are more likely to be nonadherent to their HIV medications, less likely to keep their clinic appointments related to HIV treatment and care, and more likely to die during hospitalizations than their ethnic counterparts. The present study explored the preferences of older African Americans with HIV for a health literacy intervention to promote HIV management.Patients and methods: In this qualitative study, 20 older adult African Americans living with HIV were recruited from an HIV/acquired immunodeficiency syndrome outpatient clinic in the southeastern region of the US. Using patient-centered participatory design methods, semi-structured individual interviews were conducted to determine patient preferences for intervention development and design. Health literacy was also measured using the Rapid Estimate of Adult Literacy in Medicine – Revised (REALM-R).Results: Four major themes emerged related to intervention development and design: keep health information simple; use a team-based approach for health education; tailor teaching strategies to patients’ individual needs; and account for patients’ low experience, but high interest, in technology. Forty-five percent of the study population had low health literacy based on the revised Rapid Estimate of Adult Literacy in Medicine.Conclusion: Future interventions that target minorities and older adults living with HIV should consider patients’ learning needs, sex-specific and mental health needs, and delivery approaches, in order to increase uptake and improve disease management and health outcomes. Keywords: health disparities, health literacy, HIV/AIDS, medication adherence, older adults, racial disparitie

Does Sericin, as a Novel Pleurodesis Agent, Have Higher Effectiveness Compared to Talcum Powder, Doxycycline, and Silver Nitrate Pleurodesis? [¿Es el nuevo agente pleurodésico sericina más efectivo para pleurodesis que el polvo de talco, la doxiciclina y el nitrato de plata?]

Introduction: The usefulness of sericin as pleurodesis agent has previously been described. Present study aims to compare sericin pleurodesis regarding success, effectiveness, tolerability, and side-effects. Methods: Adult, 12-week-old Wistar-albino rats (n = 60), divided to five groups as sericin, talcum-powder, doxycycline, silver-nitrate and control. Agents were administrated through left thoracotomy, rats sacrificed twelve-days after. Results: Highest ratio of collagen fibers was observed in sericin group, and the intensity was higher than talcum-powder group (p < 0.05). Compared to silver nitrate, sericin group displayed better mesothelial reaction, and multi-layer mesothelium was also better (p < 0.05). Foreign body reaction and emphysema were less frequent in sericin group (p < 0.05). The presence of biological tissue in parenchyma was less prominent in sericin group (p < 0.05). Foreign body reaction on thoracic wall was less common in sericin group (p < 0.05). Presence of biological tissue glue in thoracic wall was less prominent in sericin group (p < 0.05). Glomerular degeneration was lower in sericin group compared to the silver nitrate group (p < 0.05), and tubular degeneration was less common in sericin group than talcum group (p < 0.05). Pericarditis was less common in sericin group compared to the other groups (p < 0.05). Conclusion: As an intrinsic, natural glue protein, sericin protects the lung parenchyma and tissues, and its glue-like characteristics enable pleurodesis. The success of sericin in pleurodesis was demonstrated in the present study based on investigations of the pleurae. Being cost-effective and better tolerated agent associated with a low potential of side effects, sericin is more effective, less expensive and provides more lung parenchyma protection. © 2018 SEPA

Fetuses with Neural Tube Defects: ethical approaches and the role of health care professionals in Turkish health care institutions

Neural tube defects (NTDs) are very serious malformations for the fetus, causing either low life expectancy or a chance of survival only with costly and difficult surgical interventions. In western countries the average prevalence is 1/1000-2000 and in Turkey it is 4/1000. The aim of the study was to characterize ethical approaches at institutional level to the fetus with an NTD and the mother, and the role of health care professionals in four major centers in Turkey. The authors chose perinatology units of four university hospitals and prepared questionnaires for the responsible professionals concerning their own and their institution's ethical approaches to the fetus with an NTD and the mother. The investigation revealed that there were no institutional ethical frameworks or ethics committees available to professional teams in the units. The roles of the health care professionals and their individual decisions and approaches based on ethical principles are described. The ethical decision-making process concerning fetuses with NTDs, examples of institutional approaches to the topic and institutional frameworks, and the role of nurses and other health care professionals are all discussed, based on a literature review. The authors suggest that institutional ethical frameworks, ethics committees, professionals' ethics education and multidisciplinary teamwork should be established for critical situations such as fetuses with an NTD