- ICH GCP
- Registro de ensaios clínicos dos EUA
- Ensaio Clínico NCT01537133
Airway Microbiome in Asthma: Relationships to Asthma Phenotype and Inhaled Corticosteroid Treatment
There are new, very sensitive methods for detecting bacteria. These methods show that hundreds of millions of microbes (organisms that can only be seen with microscopes), especially bacteria, live in healthy people. The collection of different microbes found in a site is called a "microbiome." The investigators know that microbiomes of the skin, sinuses, mouth, gastro-intestinal tract, etc. differ from each other. The make-up of the microbiome - which bacteria are found in a site - may be necessary for good health. For example, the microbiome of the mouth is different in people with inflammation of the gums (periodontitis), and the microbiome of the bowel is different in people with inflammation of the intestinal tract (inflammatory bowel disease).
The purpose of this research study is to find out if the microbiome in the lungs is different in healthy people without asthma compared to people with asthma. This study will also find out if the microbiome of the lungs changes when people with asthma take a daily "controller" medication called an inhaled corticosteroid.
Visão geral do estudo
Status
Intervenção / Tratamento
Descrição detalhada
Tipo de estudo
Inscrição (Real)
Estágio
- Não aplicável
Contactos e Locais
Locais de estudo
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California
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San Francisco, California, Estados Unidos, 94143-0130
- University of California, San Francisco, Adult
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Colorado
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Denver, Colorado, Estados Unidos, 80206
- National Jewish Health
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Illinois
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Chicago, Illinois, Estados Unidos, 60611
- Northwestern Memorial Hospital
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Massachusetts
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Boston, Massachusetts, Estados Unidos, 02115
- Brigham & Women's Hospital
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Missouri
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St. Louis, Missouri, Estados Unidos, 63110
- Washington University
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North Carolina
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Durham, North Carolina, Estados Unidos, 27110
- Duke University School of Medicine
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Winston-Salem, North Carolina, Estados Unidos, 27157
- Wake Forest University Health Sciences
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Pennsylvania
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Pittsburgh, Pennsylvania, Estados Unidos, 15213
- University of Pittsburgh, Adult
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Wisconsin
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Madison, Wisconsin, Estados Unidos, 53972
- University of Wisconsin
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Critérios de participação
Critérios de elegibilidade
Idades elegíveis para estudo
Aceita Voluntários Saudáveis
Gêneros Elegíveis para o Estudo
Descrição
Inclusion Criteria:
Asthmatic:
- History of physician-diagnosed asthma.
- Methacholine PC20 < 8mg/ml and/or FEV1 improvement ≥ 12% in response to 180 mcg albuterol.
- FEV1 ≥ 70% of predicted after 180 mcg albuterol.
- Stable asthma for ≥ 3 months prior to enrollment (no urgent care visits, no systemic corticosteroid treatment).
- Asthma Control Questionnaire 6 Score < 1.5.
- Able to provide informed consent.
- Able to perform spirometry as per ATS criteria.
- Evidence by allergen skin test of sensitivity to an aeroallergen.
- Willingness, if female and able to conceive, to utilize one medically-acceptable form of contraception.
Healthy Control:
- Evidence by allergen skin test of sensitivity to an aeroallergen.
- Able to provide informed consent.
- Able to perform spirometry as per ATS criteria.
Exclusion Criteria:
Asthmatic:
- Presence of lung disease other than asthma.
- Use of > 10 doses of nasal corticosteroids in the previous 3 months.
- Presence of significant medical illness or other chronic diseases whose treatment could affect the clinical features measured, responses to the therapies to be given in this study, or risks of participating in the study.
- History of atrial or ventricular tachyarrhythmia.
- Changes suggestive of cardiac ischemia on ECG at baseline.
- History of upper respiratory infection, sinusitis, bronchitis, or antibiotic use in the previous 3 months.
- History of chronic sinus disease.
- Smoking > 5 pack-years, or within the past year
- History of long-term controller medication use for asthma (inhaled or oral corticosteroid, leukotriene pathway antagonist, cromolyn, or theophylline within the preceding 6 months.
- History of bleeding disorder.
- Reduced creatinine clearance.
- Inability, in the opinion of the Study Investigator, to coordinate use of inhaler or otherwise comply with medication regimens.
- Contraindication to bronchoscopy on history or examination.
Healthy Control:
- History of chronic respiratory disease including asthma.
- Presence of significant medical illness or other chronic diseases whose treatment could affect the clinical features measured, responses to the therapies to be given in this study, or risks of participating in the study.
- History of atrial or ventricular tachyarrhythmia.
- Changes suggestive of cardiac ischemia on ECG at baseline.
- History of upper respiratory infection, sinusitis, bronchitis, or antibiotic use in the previous 3 months.
- Methacholine PC20 < 16 mg/ml or FEV1 improvement ≥ 12% in response to albuterol.
- History of chronic sinus disease
- Smoking > 5 pack-years, or within the past year
- Use of > 10 doses of a nasal corticosteroid preparation in the previous 3 months
- FEV1 or FVC < 80% predicted.
- History of bleeding disorder.
- Reduced creatinine clearance.
- Contraindication to bronchoscopy on history or examination.
Plano de estudo
Como o estudo é projetado?
Detalhes do projeto
- Alocação: Randomizado
- Modelo Intervencional: Atribuição Paralela
- Mascaramento: Quadruplicar
Armas e Intervenções
Grupo de Participantes / Braço |
Intervenção / Tratamento |
|---|---|
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Sem intervenção: Controle Saudável
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Experimental: Inhaled corticosteroid
Fluticasone (250 mcg/puff, one puff, twice a day)
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Dry Powder Inhaler: 250 mcg/puff, one puff, twice a day
Outros nomes:
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Comparador de Placebo: Placebo
Placebo fluticasone (one puff, twice a day)
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Dry Powder Inhaler: Placebo
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Sem intervenção: Atopic Non-asthmatics
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O que o estudo está medindo?
Medidas de resultados primários
Medida de resultado |
Descrição da medida |
Prazo |
|---|---|---|
|
Microbial Community Richness
Prazo: baseline and after 6 weeks of treatment
|
Richness is the total number of different bacterial taxa detected in the sample.
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baseline and after 6 weeks of treatment
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Microbial Community Diversity
Prazo: baseline and after 6 weeks of treatment
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The Shannon diversity index is a type of entropy measure and is a function of the distribution of the total number of organisms across all of the species.
If S is the total number of species in the sample and p_i is the number of organisms in the i-th species divided by the total number of organisms, then Diversity = -Σ p_i log(p_i).
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baseline and after 6 weeks of treatment
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Microbial Community Evenness
Prazo: baseline and after 6 weeks of treatment
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Pielou's evenness index is a scaled measure of biodiversity and is equal to the observed Shannon diversity index divided by the maximum possible Shannon diversity index, which would occur if all of the species in the sample were equally abundant.
Evenness = D/log(S), where D is the Shannon Diversity index and log(S) is the maximum diversity of the sample.
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baseline and after 6 weeks of treatment
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Colaboradores e Investigadores
Patrocinador
Colaboradores
Investigadores
- Investigador principal: Lewis Smith, MD, Northwestern Memorial Hospital
- Investigador principal: Richard Martin, MD, National Jewish Health
- Investigador principal: Christine Sorkness, MD, University of Wisconsin, Madison
- Investigador principal: Sally Wenzel, MD, University of Pittsburgh Medical Center
- Investigador principal: Stephen Peters, MD, Wake Forest University Health Sciences
Publicações e links úteis
Datas de registro do estudo
Datas Principais do Estudo
Início do estudo
Conclusão Primária (Real)
Conclusão do estudo (Real)
Datas de inscrição no estudo
Enviado pela primeira vez
Enviado pela primeira vez que atendeu aos critérios de CQ
Primeira postagem (Estimativa)
Atualizações de registro de estudo
Última Atualização Postada (Estimativa)
Última atualização enviada que atendeu aos critérios de controle de qualidade
Última verificação
Mais Informações
Termos relacionados a este estudo
Termos MeSH relevantes adicionais
- Doenças Respiratórias
- Doenças do sistema imunológico
- Doenças pulmonares
- Hipersensibilidade, Imediata
- Doenças brônquicas
- Doenças Pulmonares Obstrutivas
- Hipersensibilidade Respiratória
- Hipersensibilidade
- Asma
- Efeitos Fisiológicos das Drogas
- Agentes Autônomos
- Agentes do Sistema Nervoso Periférico
- Antiinflamatórios
- Agentes dermatológicos
- Agentes broncodilatadores
- Agentes Antiasmáticos
- Agentes do Sistema Respiratório
- Agentes Antialérgicos
- Fluticasona
Outros números de identificação do estudo
- AsthmaNet 003
- U10HL098115 (Concessão/Contrato do NIH dos EUA)
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