- ICH GCP
- Registro de ensayos clínicos de EE. UU.
- Ensayo clínico NCT00037427
Airway Responses Following Chlorine Gas Exposure
Descripción general del estudio
Estado
Condiciones
Descripción detallada
DESIGN NARRATIVE:
The specific aims of the study are to determine: (1) the effects of asthma with pre-existing airway hyper reactivity on the pulmonary function and airway reactivity and inflammation responses to chlorine; (2) the effects of chlorine concentration on the pulmonary function and airway reactivity and inflammation responses to chlorine; and (3) to assess the time dynamics of the pulmonary function and airway reactivity and inflammation responses to chlorine. It is hypothesized that both airway hyperactivity and higher chlorine concentration will result in larger changes in pulmonary function and airway reactivity and inflammation responses, and that these changes will have differential time courses following chlorine exposure. This study uses two controlled human exposure experiments, utilizing a single-blind, repeated-measures, and counter- balanced design. The two subject groups for both experiments will consist of 21 individuals with no airway hyperactivity, and 21 individuals with both asthma and airway hyperactivity. In Experiment One, subjects are exposed for 15 minutes separately to each of: (1) chlorine at 0.4 ppm; (2) chlorine at 1.0 ppm; and (3) filtered air (Control). Pulmonary function and airway reactivity are measured immediately pre-exposure and 1 and 20 hours post-exposure. Airway inflammation, as determined by cellular and biochemical components from sputum-induction, is measured 65 hours pre-exposure and 20 hours post-exposure. In Experiments Two, subjects are exposed for 15 minutes separately to each of: (1) chlorine (concentration determined from Experiment One); (2) filtered air (Control). Pulmonary function and airway reactivity are measured immediately pre-exposure and at 3 and 72 hours post-exposure. Sputum-induction is performed 65 hours pre-exposure and at 3 and 72 hours post-exposure. The results of this study will provide information on a major irritant chemical relevant to occupational environments. Specially, the susceptibility of a large sub-population at increased risk, the dose-response effects, and the post-exposure time dynamics of the effects of chlorine gas will be determined.
The study completion date listed in this record was obtained from the "End Date" entered in the Protocol Registration and Results System (PRS) record.
Tipo de estudio
Criterios de participación
Criterio de elegibilidad
Edades elegibles para estudiar
Acepta Voluntarios Saludables
Géneros elegibles para el estudio
Descripción
Plan de estudios
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Colaboradores e Investigadores
Patrocinador
Investigadores
- Colin Solomon, University of California at San Francisco
Fechas de registro del estudio
Fechas importantes del estudio
Inicio del estudio
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
Términos MeSH relevantes adicionales
Otros números de identificación del estudio
- 1170
- R01HL069664 (Subvención/contrato del NIH de EE. UU.)
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. .