Cardiovascular Effects of Exposure to Ozone (MOSES)
The Multicenter Ozone Study in Elderly Subjects will investigate whether short-term exposure of elderly volunteers to ambient levels of ozone in a controlled exposure setting causes acute cardiovascular responses as assessed by changes in blood pressure, cardiac function, and systemic biomarkers of inflammation, endothelial dysfunction, and thrombosis.
|Study Design:||Time Perspective: Prospective|
|Official Title:||Multicenter Ozone Study in Elderly Subjects|
- Change in endothelial function [ Time Frame: Baseline (16 hours before exposure) and 4 hours after exposure ] [ Designated as safety issue: No ]Brachail artey flow-mediated dilation and nitroglycerin-mediated dilation
- Change in heart rate variability [ Time Frame: Baseline (0.5 hours before exposure) and 0.2, 2, and 21.5 after exposure ] [ Designated as safety issue: No ]measured with Holter monitor
- Change in prothrombotic vascular state [ Time Frame: Baseline (17 hour before exposure) and 3.5 and 22 hours after exposure ] [ Designated as safety issue: No ]Peripheral blood samples will be taken and stored as plasma for measurement of von Willenbrand Factor antigen
- Change in cardiac repolarization [ Time Frame: Baseline (0.5 hours before exposure) and 0.2, 2, and 21.5 after exposure ] [ Designated as safety issue: No ]from Holter monitor
- Change in markers of systemic inflammation [ Time Frame: Baseline (17 hour before exposure) and 3.5 and 22 hours after exposure ] [ Designated as safety issue: No ]Peripheral blood samples will be taken and stored as plasma for measurements of inflammatory markers
- Change in lung function [ Time Frame: Baseline (0.2 hours before exposure) and 0.5, 3, and 22.5 hours after exposure ] [ Designated as safety issue: No ]Spirometry
- Lung inflammation [ Time Frame: 22 hours after exposure ] [ Designated as safety issue: No ]A sputum sample will be obtained and stored for measurement of inflammatory mediators
Biospecimen Retention: Samples With DNA
|Study Start Date:||January 2012|
|Estimated Study Completion Date:||December 2014|
|Estimated Primary Completion Date:||December 2014 (Final data collection date for primary outcome measure)|
This multicenter study will investigate whether short-term exposure of elderly volunteers to ambient levels of O3 in a controlled exposure setting while intermittently exercising causes acute cardiovascular responses. The study is based on the suppositions that: 1) elderly people are a susceptible group for cardiovascular effects; and 2) effects are more likely with exercise.
The study will involve approximately 90 healthy volunteers aged ≥55 and ≤70 who meet strict criteria for inclusion. They will be exposed for 3 hours to clean air, 0.07 ppm O3 (near the current NAAQS), and 0.12 ppm O3 (a level measured in several locations in the US). A suite of cardiovascular and pulmonary endpoints will be measured on the day before the exposure and up to 22 hours after the exposures. The study is being conducted at three centers using a common protocol and common SOPs. Most the endpoints will be analyzed by core laboratories to reduce the variability in the results. A Data Coordination and Analysis Center will assemble all the data generated by the three centers and conduct the statistical analyses on the combined data sets.
The study has 3 main objectives:
- To determine the relationship of altered autonomic balance (measured as changes in heart rate and heart rate variability (HRV)), cardiac arrhythmia, and repolarization and ozone exposure.
- To identify instances of altered systemic vascular function [measured as brachial artery flow-mediated dilation (FMD)without and with nitroglycerin (NTG) when exposed to ozone.
- To identify pro-thrombotic vascular state (measured as increase in von Willebrand factor antigen in blood - primary endpoints) when exposed to ozone.
Additional objectives include:
- To identify any increase in micro particle-associated tissues factor (measured as number of particles and tissue factor activity) and platelet activation) in ozone exposure.
- To identify if markers of systemic oxidative stress and inflammation and any correlation with the cardiovascular effects and degree of airway injury (measured as CC16) and airway inflammatory effects (neutrophils and cytokines in induced sputum) in ozone exposure.
- To determine if cardiovascular effects in ozone exposure are correlated with airway inflammatory effects, but not lung function effects.
|Contact: Maria G Costantini, PhDfirstname.lastname@example.org|
|United States, California|
|University of California at San Francisco||Recruiting|
|San Francisco, California, United States, 94143|
|Contact: Hofer Wong 415-206-8951 email@example.com|
|Principal Investigator: John Balmes, MD|
|United States, Massachusetts|
|New England Research Institutes, Inc.||Active, not recruiting|
|Watertown, Massachusetts, United States, 02472|
|United States, New York|
|University of Rochester||Recruiting|
|Rochester, New York, United States, 14642|
|Contact: Erika Little 585-275-4163 firstname.lastname@example.org|
|Principal Investigator: Mark Frampton, MD|
|United States, North Carolina|
|University of North Carolina at Chapel Hill||Recruiting|
|Chapel Hill, North Carolina, United States, 27599|
|Contact: Martha Almond 919-966-0759 email@example.com|
|Principal Investigator: Philip Bromberg, MD|
|Principal Investigator:||Anne Stoddard, PhD||New England Research Institutes|