- ICH GCP
- Registro de ensayos clínicos de EE. UU.
- Ensayo clínico NCT00775099
Combustion Derived Air Pollution and Vascular Function
The Effects of Combustion-Derived Air Pollution on Vascular Vasomotor and Fibrinolytic Function in Healthy Volunteers (Diesel Exposure)
Air pollution is a major cause of cardiovascular morbidity and mortality. The components of air pollution responsible and the mechanisms through which they might mediate these harmful effects remain only partially understood. The link between cardiovascular disease and air pollution is strongest for fine particulate matter. Fine particulate matter (PM) is produced from the combustion of fossil fuels with the most significant threat thought to be posed by small particles less than 10µm (PM 10) which can be inhaled into the lungs. We propose to identify the precise component of diesel exhaust that mediates the adverse cardiovascular effects using a carbon particle generator, and a particle concentrator. The aim of this study proposal is to assess the vascular effects of different types and components of air pollution in healthy subjects. We intend to test the hypotheses that:
- Combustion derived nanoparticulate causes an acute impairment of endothelial vasomotor and fibrinolytic function in healthy volunteers.
- Exposure to combustion derived air pollution is associated with increased thrombus formation.
Descripción general del estudio
Estado
Condiciones
Intervención / Tratamiento
Tipo de estudio
Inscripción (Actual)
Fase
- No aplica
Contactos y Ubicaciones
Ubicaciones de estudio
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-
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Edinburgh, Reino Unido, EH16 4SB
- University of Edinburgh
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Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
- Niño
- Adulto
- Adulto Mayor
Acepta Voluntarios Saludables
Géneros elegibles para el estudio
Descripción
Inclusion Criteria:
- Healthy volunteers
Exclusion Criteria:
- Current smokers
- Significant occupational exposure to air pollution
- History of lung disease
- Women of child-bearing potential
- Malignant arrhythmias
- Renal or hepatic failure
- Significant co-morbidity
- Systolic blood pressure >190 or <100 mmHg
- Previous history of blood dyscrasia
- Unable to tolerate the supine position
- Lack of informed consent
- Blood donation within last 3 months
Plan de estudios
¿Cómo está diseñado el estudio?
Detalles de diseño
- Propósito principal: Ciencia básica
- Asignación: Aleatorizado
- Modelo Intervencionista: Asignación cruzada
- Enmascaramiento: Triple
Armas e Intervenciones
Grupo de participantes/brazo |
Intervención / Tratamiento |
---|---|
Experimental: Filtered Air Exposure
1 hour exposure to filtered air during intermittent exercise
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Forearm venous occlusion plethysmography to measure forearm blood flow during intra-arterial infusion of the vasodilators Verapamil (10-100 µg/min), bradykinin (100-1000 pmol/min), sodium nitroprusside (2-8 µg/min) and Acetylcholine (5-20 mg/min).
Otros nombres:
Ex-vivo assessment of thrombus formation using Badimon Chamber
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Experimental: Diesel Exhaust Exposure
1 hour exposure to dilute diesel exhaust at a concentration of 300 µg/m3 during intermittent exercise
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Forearm venous occlusion plethysmography to measure forearm blood flow during intra-arterial infusion of the vasodilators Verapamil (10-100 µg/min), bradykinin (100-1000 pmol/min), sodium nitroprusside (2-8 µg/min) and Acetylcholine (5-20 mg/min).
Otros nombres:
Ex-vivo assessment of thrombus formation using Badimon Chamber
|
Experimental: Filtered Diesel Exposure
1 hour exposure to diesel exhaust with all particulates filtered out using teflon filter with intermittent exercise
|
Forearm venous occlusion plethysmography to measure forearm blood flow during intra-arterial infusion of the vasodilators Verapamil (10-100 µg/min), bradykinin (100-1000 pmol/min), sodium nitroprusside (2-8 µg/min) and Acetylcholine (5-20 mg/min).
Otros nombres:
Ex-vivo assessment of thrombus formation using Badimon Chamber
|
Experimental: PALAS Exposure
1 hour exposure to pure carbon particles produced by PALAS generator during intermittent exercise
|
Forearm venous occlusion plethysmography to measure forearm blood flow during intra-arterial infusion of the vasodilators Verapamil (10-100 µg/min), bradykinin (100-1000 pmol/min), sodium nitroprusside (2-8 µg/min) and Acetylcholine (5-20 mg/min).
Otros nombres:
Ex-vivo assessment of thrombus formation using Badimon Chamber
|
¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Periodo de tiempo |
---|---|
Forearm blood flow measured by forearm venous occlusion plethysmography in response to infused vasodilators
Periodo de tiempo: 6-8 hours after exposure
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6-8 hours after exposure
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Medidas de resultado secundarias
Medida de resultado |
Periodo de tiempo |
---|---|
Ex-vivo thrombus formation assessed using the Badimon chamber
Periodo de tiempo: 6 hours after exposure
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6 hours after exposure
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Arterial stiffness measured by radial artery tonometry
Periodo de tiempo: Before and after exposure
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Before and after exposure
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Heart rate and heart rate variability measured with 3 lead Holter electrographic monitors
Periodo de tiempo: During and for 24 hours after exposure
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During and for 24 hours after exposure
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Blood pressure
Periodo de tiempo: During and after exposure and during forearm study
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During and after exposure and during forearm study
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Plasma t-PA and PAI concentrations following infusion of bradykinin
Periodo de tiempo: During forearm study
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During forearm study
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Plasma inflammatory markers IL-6, TNF-alpha, IL-1 and hsCRP
Periodo de tiempo: Before and after exposure
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Before and after exposure
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Platelet monocyte binding as measured by flow cytometry
Periodo de tiempo: After the exposure
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After the exposure
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Colaboradores e Investigadores
Patrocinador
Investigadores
- Investigador principal: Nicholas L Mills, MB BCh MRCP, University of Edinburgh
Publicaciones y enlaces útiles
Publicaciones Generales
- Mills NL, Tornqvist H, Robinson SD, Gonzalez M, Darnley K, MacNee W, Boon NA, Donaldson K, Blomberg A, Sandstrom T, Newby DE. Diesel exhaust inhalation causes vascular dysfunction and impaired endogenous fibrinolysis. Circulation. 2005 Dec 20;112(25):3930-6. doi: 10.1161/CIRCULATIONAHA.105.588962.
- Langrish JP, Watts SJ, Hunter AJ, Shah AS, Bosson JA, Unosson J, Barath S, Lundback M, Cassee FR, Donaldson K, Sandstrom T, Blomberg A, Newby DE, Mills NL. Controlled exposures to air pollutants and risk of cardiac arrhythmia. Environ Health Perspect. 2014 Jul;122(7):747-53. doi: 10.1289/ehp.1307337. Epub 2014 Mar 25.
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
Otros números de identificación del estudio
- 05/S1103/46
Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .
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