- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT02153359
Effects of Reducing Indoor Air Pollution on the Adult Asthmatic Response (INHALE 2)
August 20, 2019 updated by: Johns Hopkins University
This study is about asthma and how the environment affects asthma.
Scientists know that air pollution (such as cigarette smoke and other particles in the air) can make asthma symptoms worse.
This research is being done to study how the health of a person with asthma responds to an air cleaner.
The investigator hypothesize that an air cleaner will improve the health of persons with asthma.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Detailed Description
The investigators seek to determine the effect of placing air cleaner devices in the homes of adults with asthma on the adults' asthma health.
To this end, the investigators aim to study 40 adults with asthma that are 18-50 years of age and live in Baltimore.
Participants will receive either true air cleaners or sham cleaners in a blinded, randomized manner for one month, and then, after a washout period, participants will cross over and receive the other intervention (sham or true cleaner).
All participants will have environmental monitoring (personal and in-home) to determine participants' particulate matter exposure, and be followed repeatedly during the 3 month study period for markers of asthma disease, including respiratory symptoms, medication and health care utilization, pulmonary function, systemic markers of inflammation, and bronchoscopic evidence of airway inflammation or epithelial cell dysfunction.
Study Type
Interventional
Enrollment (Actual)
23
Phase
- Not Applicable
Contacts and Locations
This section provides the contact details for those conducting the study, and information on where this study is being conducted.
Study Locations
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Maryland
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Baltimore, Maryland, United States, 21287
- Johns Hopkins Hospital
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Baltimore, Maryland, United States, 21224
- Johns Hopkins Bayview Medical Center
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Participation Criteria
Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.
Eligibility Criteria
Ages Eligible for Study
18 years to 50 years (Adult)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Age 18-50 years of age
- Non-smoker (<100 cigarettes in lifetime)
- Physician diagnosis of asthma
- Symptoms of asthma and/or reliever medication use in the past 6 months
- Living in the current residence >= 6 months within Baltimore
- Enrollment in, and completion of, the observational environmental asthma study "Inhale 1"
Exclusion Criteria:
- Current diagnosis of another major pulmonary disease, other significant morbidity
- Pregnancy (as defined by a positive urine pregnancy test at screening of all women of child-bearing potential)
- Planning to relocate residence or activity that necessitates travel away from home for prolonged period of time during the study period
- Current use of an air cleaner in the home
Study Plan
This section provides details of the study plan, including how the study is designed and what the study is measuring.
How is the study designed?
Design Details
- Primary Purpose: Supportive Care
- Allocation: Randomized
- Interventional Model: Crossover Assignment
- Masking: Double
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Experimental: Air cleaner then sham air cleaner
A High Efficiency Particulate Air Cleaner (HEPA) intervention will be placed in the participant's home for one month.
During the last week of the month, health assessments will be conducted, which include in-home health questionnaires, symptom-, and activity- diaries/recalls, blood, and hand-held spirometry.
Participants will also be asked to wear a light backpack with air monitoring devices during the course of the day during the last week in order to measure participants' exposures to pollutants.
Finally, at the end of the month, participants will be asked to report to the Johns Hopkins outpatient endoscopy suite for bronchoscopy, during which airway sampling will occur under conscious sedation.
For the participants who started in the experimental arm, after this one month intervention period, they will then enter a wash-out period where no intervention or outcome measures are undertaken for at least one month prior to cross-over to the sham comparator arm.
|
|
Sham Comparator: Sham air cleaner then air cleaner
A sham air cleaner will be placed in the participant's home for one month.
During the last week of the month, health assessments will be conducted, which include in-home health questionnaires, symptom-, and activity- diaries/recalls, blood, and hand-held spirometry.
Participants will also be asked to wear a light backpack with air monitoring devices during the course of the day during the last week in order to measure participants' exposures to pollutants.
Finally, at the end of the month, participants will be asked to report to the Johns Hopkins outpatient endoscopy suite for bronchoscopy, during which airway sampling will occur under conscious sedation.
For the participants who started in the sham comparator arm, after this one month intervention period, they will then enter a wash-out period where no intervention or outcome measures are undertaken for at least one month prior to cross-over to the experimental arm.
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
PM2.5 Concentration (ug/m^3)
Time Frame: Approximately 1 month
|
Fine particulate matter (PM2.5)
concentration as assessed by a passive filter placed in the participant's home.
|
Approximately 1 month
|
PM2.5-10 Concentration (ug/m^3)
Time Frame: Approximately 1 month
|
Coarse particulate matter (PM2.5-10)
concentration as assessed by a passive filter placed in the participant's home.
|
Approximately 1 month
|
Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Number of Symptom-free Days
Time Frame: 7 days
|
The number of reported days without daytime asthma symptoms (symptom-free days) as based on daily symptom diaries recorded by the patient.
|
7 days
|
Number of Days With Activity Limitations
Time Frame: 7 days
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Number of reported days with activity limitations due to asthma symptoms.
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7 days
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Number of Nights Disrupted by Asthma Symptoms
Time Frame: 7 nights
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The number of nights spent sleeping that was disrupted due to asthma symptoms.
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7 nights
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Number of Days of School/Work Missed Due to Asthma Symptoms
Time Frame: 7 days
|
The number of days of school or work missed due to asthma symptoms.
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7 days
|
Number of Days of Unscheduled Visits to the Doctor Due to Asthma Symptoms
Time Frame: 7 days
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The number of days of unscheduled, urgent visits to the office, urgent care or emergency department due to asthma symptoms.
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7 days
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Asthma Disease Status as Assessed by the Asthma Control and Communication Instrument (ACCI)
Time Frame: Approximately 1 month
|
The ACCI is a validated clinical tool that measures asthma disease status during routine health care and is valid for use in both black and white populations.
The sum of each of the 5 ACCI asthma control domains results in a final ACCI score ranging from 0 (better control) to 19 (worse control).
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Approximately 1 month
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Asthma-specific Health-related Quality of Life as Assessed by the Asthma Quality of Life Questionnaire (AQLQ)
Time Frame: Approximately 1 month
|
The AQLQ is validated clinical tool to assess asthma-specific health-related quality of life instrument that taps both physical and emotional impact of disease.
Scores range from 1-7, with higher scores indicating better quality of life.
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Approximately 1 month
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Air Nicotine Concentration (ug/m^3)
Time Frame: Approximately 1 month
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Indoor air nicotine concentration as assessed by a passive filter placed in the participant's home.
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Approximately 1 month
|
Bronchoalveolar Lavage Differential Neutrophil Count
Time Frame: 1 Day
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The percentage of neutrophils in the bronchoalveolar lavage cell count.
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1 Day
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Bronchoalveolar Lavage Differential Eosinophil Count
Time Frame: 1 day
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The eosinophil percentage in the bronchoalveolar lavage cell count differential.
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1 day
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Pre-bronchodilator Forced Vital Capacity (Litres)
Time Frame: 1 day
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Pre-bronchodilator forced vital capacity (FVC) as assessed with spirometry
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1 day
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Pre-bronchodilator Forced Expiratory Volume in 1 Second (Litres)
Time Frame: 1 day
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The pre-bronchodilator forced expiratory volume in 1 second (FEV1) as assessed by spirometry.
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1 day
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FEV1 Percentage of FVC
Time Frame: 1 day
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The pre-bronchodilator forced expiratory volume in 1 second over the forced vital capacity as assessed by spirometry.
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1 day
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Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Investigators
- Principal Investigator: Sonali Bose, MD MPH, Johns Hopkins University
Study record dates
These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.
Study Major Dates
Study Start (Actual)
February 1, 2014
Primary Completion (Actual)
September 11, 2018
Study Completion (Actual)
September 11, 2018
Study Registration Dates
First Submitted
April 21, 2014
First Submitted That Met QC Criteria
May 29, 2014
First Posted (Estimate)
June 3, 2014
Study Record Updates
Last Update Posted (Actual)
September 12, 2019
Last Update Submitted That Met QC Criteria
August 20, 2019
Last Verified
August 1, 2019
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- NA_00082646
- 1K24ES021098-01 (U.S. NIH Grant/Contract)
- K23ES021789 (U.S. NIH Grant/Contract)
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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