Cardiovascular Effects of Aerosols in Residences Study (CLEAR)
Subclinical Cardiovascular Health Benefits of Interventions to Reduce Exposure to Combustion-Derived Particulate Air Pollution
This study is focused on the effects of HEPA filtration to reduce exposures to combustion-derived air pollution (CDAP). Specifically, the study will evaluate the health benefits of HEPA filters and compare the cardiovascular toxicity of two major sources of CDAP, specifically traffic and residential wood combustion.
Specifically, the purpose of this study is to evaluate the ability of portable high efficiency particle air (HEPA) filters to reduce exposures to PM2.5 and air pollution indoors and to improve subclinical indicators of microvascular function and systemic inflammation among healthy adult participants.
The investigators hypothesize that HEPA filter use will help decrease indoor concentrations of CDAP thereby helping to mitigate the associated cardiovascular risks.
Descripción general del estudio
Estado
Condiciones
Intervención / Tratamiento
Descripción detallada
To address knowledge gaps about health risks of specific pollution sources and to provide new evidence on the health benefits of air pollution interventions, the objectives of this study are: 1) quantify the relationship between low-level exposures to combustion-derived PM air pollution and subclinical indicators of cardiovascular disease risk; and 2) compare the relative impact of HEPA filtration for two major PM sources (traffic and residential wood combustion) on these indicators.
The use of HEPA filters may help to mitigate cardiovascular risks factors caused by combustion-derived air pollution (CDAP), (specifically woodstove and traffic emissions). We hypothesize that HEPA filter use and improved woodstove technology will help decrease indoor occurrences of CDAP. This project will help address knowledge gaps in CDAP-related health risks and benefits of interventions. Specific objectives include establishing a relationship between exposure to CDAP and biomarkers of cardiovascular risk and evaluating the impact of HEPA filter use towards improved indoor air quality and health indicators.
Tipo de estudio
Inscripción (Actual)
Fase
- Fase 2
Contactos y Ubicaciones
Ubicaciones de estudio
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British Columbia
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Burnaby, British Columbia, Canadá, V5A 1S6
- Simon Fraser University
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Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
Acepta Voluntarios Saludables
Géneros elegibles para el estudio
Descripción
Inclusion Criteria:
- 19 years or older
- non-smoking household
- lives within study boundaries and in areas of interest
Exclusion Criteria:
- COPD
- asthma
- diabetes
- heart disease
- hypertension
- arthritis
- gum disease
- occupationally exposed to traffic exposures &/or woodsmoke
- if female, pregnant
Plan de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
- Propósito principal: Prevención
- Asignación: Aleatorizado
- Modelo Intervencionista: Asignación cruzada
- Enmascaramiento: Único
Armas e Intervenciones
Grupo de participantes/brazo |
Intervención / Tratamiento |
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Comparador activo: Indoor Air HEPA Filtration
HEPA filters will be placed in participant's main living area and bedroom.
Actual filtration will occur during only one of the two 7-day sampling periods.
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Two HEPA filters will be placed in participant's homes (one in the bedroom and one in the main living area); each HEPA will run for 2 consecutive 7-day sampling sessions.
During one of the 7-day sampling sessions, the HEPA filter will run without the internal filter in place (i.e., "placebo" filtration).
Otros nombres:
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Comparador de placebos: HEPA Filtration Placebo
For one of two 7-day sampling sessions, HEPA filters placed in participants' homes will be run without an actual filter in the housing unit.
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for one of the two 7-day sampling sessions, both HEPA filters placed in participants' homes will be run without the actual filter in the housing unit.
Otros nombres:
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¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
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Difference in reactive hyperemia measurement after HEPA filtration
Periodo de tiempo: after 1 week of filtration
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Participants endothelial function are tested after 1 week of HEPA filtration and after 1 week of non-HEPA filtration (placebo filtration).
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after 1 week of filtration
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Medidas de resultado secundarias
Medida de resultado |
Medida Descripción |
Periodo de tiempo |
|---|---|---|
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Difference in C-Reactive Protein after HEPA Filtration
Periodo de tiempo: after 1 week of filtration
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Participants CRP is measured after 1 week of HEPA filtration and after 1 week of non-HEPA filtration (placebo filtration).
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after 1 week of filtration
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Colaboradores e Investigadores
Patrocinador
Investigadores
- Investigador principal: Ryan Allen, PhD, Simon Fraser University, Canada
Publicaciones y enlaces útiles
Publicaciones Generales
- Allen RW, Carlsten C, Karlen B, Leckie S, van Eeden S, Vedal S, Wong I, Brauer M. An air filter intervention study of endothelial function among healthy adults in a woodsmoke-impacted community. Am J Respir Crit Care Med. 2011 May 1;183(9):1222-30. doi: 10.1164/rccm.201010-1572OC. Epub 2011 Jan 21.
- Kajbafzadeh M, Brauer M, Karlen B, Carlsten C, van Eeden S, Allen RW. The impacts of traffic-related and woodsmoke particulate matter on measures of cardiovascular health: a HEPA filter intervention study. Occup Environ Med. 2015 Jun;72(6):394-400. doi: 10.1136/oemed-2014-102696. Epub 2015 Apr 20.
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio
Finalización primaria (Actual)
Finalización del estudio (Actual)
Fechas de registro del estudio
Enviado por primera vez
Primero enviado que cumplió con los criterios de control de calidad
Publicado por primera vez (Estimar)
Actualizaciones de registros de estudio
Última actualización publicada (Estimar)
Última actualización enviada que cumplió con los criterios de control de calidad
Última verificación
Más información
Términos relacionados con este estudio
Palabras clave
Términos MeSH relevantes adicionales
Otros números de identificación del estudio
- Allen,R-MOP111042
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