- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT04024852
Air Pollution, Physical Activity and Cardiovascular Function of Patients With Implanted Cardioverter Defibrillators
Air Pollution, Physical Activity and Cardiovascular Function of Patients With Implanted Cardioverter Defibrillators: A Randomized Controlled Trial of Indoor Versus Outdoor Activity
Study Overview
Detailed Description
Background: The Air Quality Health Index (AQHI) is a risk communication tool intended to provide information to the public on current and forecast air quality conditions. It was developed by the Canadian government to help the public make decisions to limit short-term exposure to air pollution and adjust their activity when air pollution levels are high, particularly for people who are sensitive to air pollution. Little research has been done to characterize the benefits of following AQHI advice. The AQHI is based on a weighted sum of concentrations of nitrogen dioxide (NO2), ozone (O3), and particulate matter of median aerodynamic diameter ≤ 2.5 µm (PM2.5) to provide information to the public on current and forecasted air quality conditions.
Objective: This study investigated whether patients with an implanted cardioverter defibrillator (ICD) who followed advice to exercise indoors on high AQHI days had reduced adverse impacts on cardiovascular measures compared with those who exercised outdoors on those days.
Methods: Participants with ICD were randomly divided into the control and intervention group. Both groups did daily 30-minute walked outdoors for maximum 70 days, and their data on blood pressure, pulse rate and blood oxygen saturation pre- and post-exercise were collected. Hourly ambient concentrations of PM2.5, O3, NO2, sulphur dioxide (SO2) and carbon monoxide (CO) were collected, and AQHI calculated. On days forecast with AQHI ≥5, the intervention group was advised to exercise indoors. Mixed-effects models were applied to analyze the associations between air pollution and cardiovascular measures.
Study Type
Enrollment (Actual)
Phase
- Not Applicable
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Description
Inclusion Criteria:
- Patients with structural heart disease with an implanted cardioverter difribrillator (ICD) in situ
- 18 years of age and older
- living and working in Toronto (Canada) and surrounding area
- The participants are healthy enough for mild outdoor activity (a 30-minute walk).
Exclusion Criteria:
- Decompensated heart failure (CHF) patients defined as a hospital admission for CHF or intravenous ionotropic administration within the preceding 6 months
- patients on class 1 and 11 antiarrhythmics and congenital heart disease patients
- patients who have experienced frequent or recent shocks (within the last 3 months of the experiment)
- patients who have underlying conditions that would interfere with mild daily exercise.
Study Plan
How is the study designed?
Design Details
- Primary Purpose: Other
- Allocation: Randomized
- Interventional Model: Parallel Assignment
- Masking: None (Open Label)
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
No Intervention: Control group
The control group did daily mild exercise (walking) outdoors for 30 minutes, for maximum 70 days.
|
|
Other: Intervention group
When Air Quality Health Index is below level 5, the intervention group did daily mild exercise (walking) outdoors for 30 minutes.
When Air Quality Health Index is equal to or above level 5, the group is advised to do mild exercise indoors for 30 minutes.
Total study period lasted for maximum 70 days.
|
When Air Quality Health Index is below level 5, the intervention group did daily mild exercise (walking) outdoors for 30 minutes.
When Air Quality Health Index is equal to or above level 5, the group is advised to do mild exercise indoors for 30 minutes.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
blood pressure
Time Frame: before and after 30-minute exercise
|
Systolic and diastolic blood pressure is measured in the dominant arm with the subject seated, using an automated sphygmomanometer (BIOS Medical, Newmarket, Ontario, Canada), taking the average of the three readings one minute apart
|
before and after 30-minute exercise
|
pulse rate
Time Frame: before and after 30-minute exercise
|
Pulse rate is measured using the pulse oximeter.
|
before and after 30-minute exercise
|
blood oxygen saturation
Time Frame: before and after 30-minute exercise
|
Oxygen saturation is measured using a pulse oximeter with a finger sensor (Choice MMed, Beijing Choice Electronic, China).
The oximeter is run continuously for 3 minutes to obtain each measurement and the average oxygen saturation during this period is recorded.
|
before and after 30-minute exercise
|
Collaborators and Investigators
Sponsor
Investigators
- Principal Investigator: Ling Liu, MD, PHD, Health Canada
Publications and helpful links
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Other Study ID Numbers
- OPAHH
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
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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