Four subgroups based on tau levels in Alzheimer's disease observed in two independent cohorts

BackgroundAs Alzheimer's disease (AD) pathology presents decades before dementia manifests, unbiased biomarker cut-points may more closely reflect presence of pathology than clinically defined cut-points. Currently, unbiased cerebrospinal fluid (CSF) tau cut-points are lacking.MethodsWe investigated CSF t-tau and p-tau cut-points across the clinical spectrum using Gaussian mixture modelling, in two independent cohorts (Amsterdam Dementia Cohort and ADNI).ResultsIndividuals with normal cognition (NC) (total n =1111), mild cognitive impairment (MCI) (total n =1213) and Alzheimer's disease dementia (AD) (total n =1524) were included. In both cohorts, four CSF t- and p-tau distributions and three corresponding cut-points were identified. Increasingly high tau subgroups were characterized by steeper MMSE decline and higher progression risk to AD (cohort/platform-dependent HR, t-tau 1.9-21.3; p-tau 2.2-9.5).LimitationsThe number of subjects in some subgroups and subanalyses was small, especially in the highest tau subgroup and in tau PET analyses.ConclusionsIn two independent cohorts, t-tau and p-tau levels showed four subgroups. Increasingly high tau subgroups were associated with faster clinical decline, suggesting our approach may aid in more precise prognoses

T Lymphocytes Promote the Antiviral and Inflammatory Responses of Airway Epithelial Cells

T cells modulate the antiviral and inflammatory responses of airway epithelial cells to human rhinoviruses (HRV)

Cationic Host Defence Peptides:Potential as Antiviral Therapeutics

There is a pressing need to develop new antiviral treatments; of the 60 drugs currently available, half are aimed at HIV-1 and the remainder target only a further six viruses. This demand has led to the emergence of possible peptide therapies, with 15 currently in clinical trials. Advancements in understanding the antiviral potential of naturally occurring host defence peptides highlights the potential of a whole new class of molecules to be considered as antiviral therapeutics. Cationic host defence peptides, such as defensins and cathelicidins, are important components of innate immunity with antimicrobial and immunomodulatory capabilities. In recent years they have also been shown to be natural, broad-spectrum antivirals against both enveloped and non-enveloped viruses, including HIV-1, influenza virus, respiratory syncytial virus and herpes simplex virus. Here we review the antiviral properties of several families of these host peptides and their potential to inform the design of novel therapeutics

A Case Study of the Implementation of a Competency-based Curriculum in a Caribbean Teaching Hospital

Objective: Several teaching hospitals are currently modifying their curriculum to comply with the changing demands in medical education. As a result, we decided to evaluate whether a competency-based curriculum implemented in a Caribbean teaching hospital fulfilled the requirements as defined by the CanMEDS framework. Methods: We made use of a triangulation method in the survey to obtain information on the educational process. Two separate methods were used consisting of site visits by visiting professors and a medical educator. The focus was on the structure, content and assessments of the educational activities. Results: Major recommendations included increased involvement of medical specialists in the educational activities in the clinical workplace. There was need for improvement of communication between medical specialists, patients, nurses, trainees and residents. Overall, improvements were observed in the structure of clinical rotations and content of the training programme. Conclusion: The implemented assessment programme provided necessary information for effective evaluation of the competency-based curriculum. We were able to identify new and feasible methods for improving the curriculum in our educational setting. Keywords: Assessment, competency-based curriculum, teaching hospita

Understanding the impact of interprofessional collaboration on the quality of care: a case report from a small-scale resource limited health care environment

Jamiu O Busari,1,2 Franka M Moll,3 Ashley J Duits3-5 1Department of Educational Development and Research, Faculty of Health, Medicine and Life Sciences, University of Maastricht, Maastricht, the Netherlands; 2Department of Pediatrics, Zuyderland Medical Center, Heerlen, the Netherlands; 3Department of Medical Education, St. Elisabeth Hospital, Willemstad, Curaçao; 4Institute for Medical Education, University Medical Center Groningen, Groningen, the Netherlands; 5Red Cross Blood Bank Foundation, Willemstad, Curaçao Background: A critical assessment of current health care practices, as well as the training needs of various health care providers, is crucial for improving patient care. Several approaches have been proposed for defining these needs with attention on communication as a key competency for effective collaboration. Taking our cultural context, resource limitations, and small-scale ­setting into account, we researched the applicability of a mixed focus group approach for analysis of the communication between doctors and nurses, as well as the measures for improvement. Study objective: Assessment of nurse-physician communication perception in patient care in a Caribbean setting. Methods: Focus group sessions consisting of nurses, interns, and medical specialists were conducted using an ethnographic approach, paying attention to existing communication, risk evaluation, and recommendations for improvement. Data derived from the focus group sessions were analyzed by thematic synthesis method with descriptive themes and development of analytic themes. Results: The initial focus group sessions produced an extensive list of key recommendations which could be clustered into three domains (standardization, sustainment, and collaboration). Further discussion of these domains in focus groups showed nurses’ and physicians’ domain perspectives and effects on patient care to be broadly similar. Risks related to lack of information, knowledge sharing, and professional respect were clearly described by the participants. Conclusion: The described mixed focus group session approach for effectively determining current interprofessional communication and key improvement areas seems suitable for our small‑scale, limited resource setting. The impact of the cultural context should be further ­evaluated by a similar study in a different cultural context. Keywords: interprofessional communication, focus group sessions, nurses’ perspective, cultural context, quality of car

Health care transformation in a resource-limited environment: exploring the determinants of a good climate for change

Tessa A van Boekholt,1 Ashley J Duits,2–4 Jamiu O Busari5,6 1Department of Public Health, United Nations High Commissioner for Refugees Uganda Operation, Arua, Uganda; 2Department of Medical Education, St. Elisabeth Hospital, Willemstad, Curaçao; 3Institute for Medical Education, University Medical Center Groningen, Groningen, The Netherlands; 4Red Cross Blood Bank Foundation, Willemstad, Curaçao; 5Department of Educational Development and Research, Faculty of Health, Medicine and Life Sciences, University of Maastricht, Maastricht, The Netherlands; 6Department of Pediatrics, Zuyderland Medical Center, Heerlen, The Netherlands Purpose: In a continued effort to improve the health care services, a project was set up to develop and implement a care pathway for the effective management of pressure ulcers in the St Elisabeth Hospital in Curaçao, the Dutch Caribbean. To ensure the effective implementation of our intervention, we decided to investigate what factors define the implementation climate of a health care institution within a resource-limited environment. Methods: We used a participatory tool approach in this study, where a mixed team of health professionals worked on two parts of a health improvement project, namely: 1) workforce leadership development through a clinical leadership training program; and 2) health care quality improvement through the pressure ulcer care pathway development. In-depth interviews were held with ten participants to gain insight into their experiences of the implementation climate in the hospitals and inductive analysis was used to identify the (sub)themes. Results: Identified themes that described the implementation climate included: 1) the attitude of staff toward policy changes; 2) vision of the organization; 3) collaboration; 4) transparency and communication; 5) personal development; and 6) resources. These factors were interrelated and associated with several potential consequences such as loss of motivation among staff, loss of creativity to solve issues, the emergence of the feeling “us” vs “them”, short-term solutions to problems, and a sense of suspicion/frustration among staff members. Conclusion: From this study, positive subconstructs for a favorable implementation climate in a hospital organization were lacking and those that were identified were suboptimal. The inability to satisfy all the subconstructs seemed to be the consequence of insufficient resources and infrastructure within the current health system. A favorable implementation climate in a resource-limited environment is closely tied to the availability of health care resources and infrastructure. Keywords: care pathway, implementation, health care, leadership, Caribbean, pressure ulcer, interprofessional collaboratio

Epidemiology of Febrile Diseases in the Emergency Department of a Caribbean Island: The Curaçao Experience

Objective: The aetiology of febrile diseases in tropical countries often remains poorly characterized. We aim to describe the aetiology and outcome of febrile illnesses at the Emergency Department (ED) in Curaçao. Methods: From April 2008 – April 2009, all adult febrile patients (T > 38.5°C) at the ED of the St Elisabeth Hospital, Curaçao, Netherlands Antilles, were included. Clinical data were recorded, routine laboratory measurements and blood cultures were taken. Final diagnoses were made at discharge by an independent physician and in retrospect by the main investigator. Results: Four hundred and three patients were included: 223 patients (55.6%) were hospitalized, 32 patients (7.9%) died and 18 patients (4.5%) were admitted to the Intensive Care Unit. In 129 febrile patients (32.0%), infection was proven; 84.4% of patients had bacterial (29.0% urinary tract infection, 23.2% pneumonia infection), 5.6% viral and 10.0% parasitic or fungal infections. Twenty-one patients (5.2%) were discharged with a non-infectious diagnosis and 172 patients (42.7%) without a clear diagnosis. Conclusion: A high mortality rate of 7.9% was observed. We found a high prevalence of bacterial infections, with pneumonia and urinary tract infections as the most common causes of fever. One in 20 patients did not have an infectious disease. Keywords: Caribbean region, emergency medicine, epidemiology, fever "Epidemiología de las Enfermedades Febriles en el Departamento de Emergencias de una Isla Caribeña: la Experiencia de Curazao" RESUMEN Objetivo: La etiología de las enfermedades febriles en los países tropicales posee aún una pobre caracterización. El presente trabajo se propone describir la etiología y la evolución clínica de las enfermedades febriles en el Departamento de Emergencias (DE) de Curazao. Métodos: De abril 2008 – abril 2009, todos los pacientes febriles adultos (T > 38.5°C) en el DE del Hospital Saint Elisabeth, de Curazao, Antillas Holandesas, fueron incluidos. Se registraron los datos clínicos, se tomaron las medidas de rutina de laboratorio y los cultivos de sangre. Los diagnósticos finales se hicieron a la hora del alta por un médico independiente y en retrospectiva por el investigador principal. Resultados: Se incluyeron cuatrocientos tres pacientes: 223 pacientes (55.6%) fueron hospitalizados, 32 pacientes (7.9%) murieron, y 18 pacientes (4.5%) fueron ingresados en la Unidad de Cuidados Intensivos. En 129 pacientes febriles (32.0%) se comprobó la infección; 84.4% de los pacientes tenían infección bacteriana (29.0% infección de las vías urinarias, 23.2% infección por pneumonia), 5.6% viral y 10.0% infección parasitaria o fúngica. Veintiún pacientes (5.2%) fueron dados de alta con un diagnóstico no infeccioso, y 172 pacientes (42.7%) sin un diagnóstico claro. Conclusión: Se observó una alta tasa de mortalidad de 7.9%. Se halló una alta prevalencia de infecciones bacterianas, siendo la pneumonía y las infecciones de las vías urinarias las causas más comunes de fiebre. Uno de cada 20 pacientes no tenía una enfermedad infecciosa. Palabras claves: región del Caribe, medicina de emergencia, epidemiología, fiebr