Mechanisms of Exacerbation of Asthma

Status

Terminated

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT00594750

Acronym

MECA

Enrollment

Registered

2008-01-16

Start date

2006-05-01

Completion date

2025-08-05

Last updated

2026-03-09

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Asthma

Brief summary

The purpose of this study is to identify the causes of asthma that were not previously suspected, to better understand the effects of inhaled steroids on asthma and to identify new way to treat asthma.

Detailed description

In this study, we will explore mechanisms of exacerbation in asthma by careful characterization studies in asthmatics presenting in acute severe exacerbation. Specifically, we will determine the frequency of secretor status in these subjects by blood and saliva testing, and we will also perform a detailed cellular and biochemical analysis of their airway secretions. We will collect airway secretions using two methods. One method will be to have subjects cough sputum into a clean plastic container. The other method only applies to asthmatics with near-fatal asthma requiring intubation and mechanical ventilation. In these asthmatics, we will collect airway secretions by tracheal aspirate using methods normally applied in their clinical care.

Interventions

None listed

Study design

Observational model

COHORT

Time perspective

CROSS_SECTIONAL

Eligibility

Sex/Gender

ALL

Age

18 Years to 75 Years

Healthy volunteers

Inclusion criteria

1. Male and female subjects with a history of asthma between the ages of 18 to 75 years. 2. Physician diagnosis of asthma. 3. Currently experiencing an acute exacerbation of asthma. This exacerbation may be severe necessitating treatment in the emergency room, ICU, or hospital ward. 4. Ability to provide informed consent.

Exclusion criteria

1. Lung disease other than asthma. 2. Females who are lactating or who are pregnant. 3. Use of recreational drugs in the 1 month preceding the study.

Design outcomes

Primary

Measure	Time frame
rheological measurements (viscosity and elasticity) in sputum from patients with acute severe asthma	1-2 years

Countries

United States

Contacts

PRINCIPAL_INVESTIGATORJohn V Fahy, M.D., M.Sc.

University of California, San Francisco

Outcome results