NCT03658538

Brief Summary

COPD is characterized by lung injury and inflammation caused by noxious particles and gases, including those emanating from cigarette smoke and air pollution. Despite the clear detrimental impact of poor air quality on respiratory outcomes, regardless of smoking status, to investigators' knowledge, there are no studied environmental interventions targeting indoor air quality to improve respiratory health of smokers, thus ignoring a potential target for harm reduction. Investigators propose a randomized controlled intervention trial to test whether targeted reductions of multiple indoor pollutants (PM, SHS and NO2) in homes of smokers with COPD will improve respiratory outcomes. Investigators have chosen a potent, multimodal intervention (active air cleaners + Motivational intervention for SHS reduction) in order to maximize the opportunity to prove that there is a health benefit to active smokers with COPD from indoor air pollution reduction.

Trial Health

87
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment
144

participants targeted

Target at P75+ for not_applicable

Timeline
Completed

Started Jun 2019

Longer than P75 for not_applicable

Geographic Reach
1 country

1 active site

Status
completed

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

First Submitted

Initial submission to the registry

August 30, 2018

Completed
6 days until next milestone

First Posted

Study publicly available on registry

September 5, 2018

Completed
9 months until next milestone

Study Start

First participant enrolled

June 3, 2019

Completed
5.2 years until next milestone

Primary Completion

Last participant's last visit for primary outcome

August 15, 2024

Completed
3 months until next milestone

Study Completion

Last participant's last visit for all outcomes

November 7, 2024

Completed
11 months until next milestone

Results Posted

Study results publicly available

September 24, 2025

Completed
Last Updated

September 24, 2025

Status Verified

September 1, 2025

Enrollment Period

5.2 years

First QC Date

August 30, 2018

Results QC Date

August 15, 2025

Last Update Submit

September 4, 2025

Conditions

Outcome Measures

Primary Outcomes (2)

  • Change in Quality of Life -St. George's Respiratory Questionnaire (SGRQ)

    St. George's Respiratory Questionnaire (SGRQ). The total score is from 0 to 100. Higher scores indicate more quality of life limitations.

    Baseline and 6 months

  • Change in Dyspnea as Assessed by the University of California San Diego Shortness of Breath Questionnaire (SDSOBQ)

    Dyspnea will be assessed using the University of California San Diego Shortness of Breath Questionnaire (SDSOBQ). The SDSOBQ scoring will range from 0 to 120 (with higher scores indicating greater difficulty breathing).

    Baseline and 6 months

Secondary Outcomes (5)

  • Change in COPD Health Status Will be Assessed by the COPD Assessment Test (CAT)

    Baseline and 6 months

  • Change in Dyspnea (Breathlessness) as Assessed by the Modified Medical Research Council Questionnaire (mMRC)

    Change from baseline and 6 months post-randomization

  • Difference in the Proportion (Probability) of Health Care Utilization Due to COPD-related Exacerbations

    From Baseline to 6 months

  • Lung Function as Assessed by the Post Forced Expiratory Volume in 1 Second (FEV1%) Predicted

    Baseline and 6 months

  • Change in the Clinical COPD Questionnaire (CCQ)

    Baseline and 6 months

Other Outcomes (3)

  • Change in Systemic Markers of Inflammation in Serum (Interleukin-8)

    Baseline and 6 months

  • Change in Systemic Markers of Inflammation in Serum (C-reactive Protein)

    Baseline and 6 months

  • Change in Markers of Oxidative Stress in Urine (8-isoprostane)

    Baseline and 6 months

Study Arms (2)

Active Treatment

ACTIVE COMPARATOR

The active treatment arm will receive two portable active HEPA air cleaners as well as 4 sessions of phone based motivational interviewing to support a home smoking ban and SHS reduction (in addition to the smoking cessation counseling received by all study participants).

Device: Active HEPA Air CleanerBehavioral: Motivational interviewing

Control Arm

SHAM COMPARATOR

Homes in the control group will receive Sham air cleaners that have the internal HEPA filter removed, but which will run normally, including similar noise, airflow and overall appearance compared to active air cleaners, thus blinding participants to filter status. The control arm will not receive phone based motivational interviewing to support a home smoking ban and SHS reduction, they will receive only smoking cessation counseling.

Device: Sham Air Cleaner

Interventions

The active treatment arm will receive two active air cleaners with HEPA and carbon filters to support a home smoking ban and SHS reduction.

Active Treatment

The active treatment arm will receive 4 sessions of phone based motivational interviewing to support a home smoking ban and SHS reduction (in addition to the smoking cessation counseling received by all study participants). The Control arm will receive only continued counseling for smoking cessation.

Active Treatment

The Control arm will receive sham air cleaners

Control Arm

Eligibility Criteria

Age40 Years+
Sexall
Healthy VolunteersNo
Age GroupsAdult (18-64), Older Adult (65+)

You may qualify if:

  • Age ≥ 40 years,
  • Physician diagnosis of COPD,
  • Global Initiative for Obstructive Lung Disease (GOLD) Stage II-IV disease with Forced Expiratory Volume (FEV1)/ Forced Vital Capacity (FVC) \<70% and FEV1 (% predicted) \<80%. IF FEV1/FVC \<70% and FEV1 (% predicted) ≥ 80%, additional requirement will apply/will be asked: COPD Assessment Test (CAT) score ≥ 10 OR exacerbation history during the last 12 months.
  • Tobacco exposure ≥ 10 pack-years
  • Current smoker with an exhaled Carbon Monoxide (eCO) ≥ 7 ppm to confirm smoking status. We will employ a combination of self-report and a biochemical marker to identify former-smokers. (If no eCO performed due to COronaVIrus Disease-19 (COVID-19) pandemic safety reasons, we will rely on self-report smoking status and self-report 7-day abstinence questionnaire answers)
  • No home smoking ban. IF smoking is not allowed indoor (inside participant's home) then a "home air quality assessment visit" may be done.

You may not qualify if:

  • Chronic systemic corticosteroids,
  • Other chronic lung disease including asthma,
  • Living in location other than home (e.g., long term care facility)
  • Home owner or occupant planning to move or change residence within study period.
  • Air Cleaners drop off (home visits temporary criteria due to COVID-19).

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

Johns Hopkins Bayview Campus

Baltimore, Maryland, 21224, United States

Location

MeSH Terms

Conditions

Pulmonary Disease, Chronic Obstructive

Interventions

Motivational Interviewing

Condition Hierarchy (Ancestors)

Lung Diseases, ObstructiveLung DiseasesRespiratory Tract DiseasesChronic DiseaseDisease AttributesPathologic ProcessesPathological Conditions, Signs and Symptoms

Intervention Hierarchy (Ancestors)

Directive CounselingCounselingMental Health ServicesBehavioral Disciplines and ActivitiesHealth ServicesHealth Care Facilities Workforce and Services

Results Point of Contact

Title
Dr. Nadia Hansel
Organization
Johns Hopkins University

Study Officials

  • Nadia N Hansel, MD, MPH

    Johns Hopkins University

    PRINCIPAL INVESTIGATOR

Publication Agreements

PI is Sponsor Employee
Yes

Study Design

Study Type
interventional
Phase
not applicable
Allocation
RANDOMIZED
Masking
TRIPLE
Who Masked
PARTICIPANT, CARE PROVIDER, INVESTIGATOR
Purpose
OTHER
Intervention Model
PARALLEL
Sponsor Type
OTHER
Responsible Party
SPONSOR

Study Record Dates

First Submitted

August 30, 2018

First Posted

September 5, 2018

Study Start

June 3, 2019

Primary Completion

August 15, 2024

Study Completion

November 7, 2024

Last Updated

September 24, 2025

Results First Posted

September 24, 2025

Record last verified: 2025-09

Data Sharing

IPD Sharing
Will not share

Locations