- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT01475968
Physiological Changes in Adults With Metabolic Syndrome Exposed to Ultrafine Air Particles (XCON)
November 5, 2013 updated by: David Diaz-Sanchez
Physiological Changes in Adults With Metabolic Syndrome Exposed to Concentrated Ultrafine Chapel Hill Air Particles
The purpose of this study is to examine the acute health effects of concentrated ambient ultrafine (UF) particulate matter (PM) exposure in patients with metabolic syndrome.
Without lifestyle changes or medical intervention these patients are at considerable risk for developing diabetes and cardiovascular disease.
Subjects (25-70) were exposed to both UF PM and filtered air for 2hr (at least 2 week interval), physiologic endpoints were measure pre-, post-, and 20hr post-exposure.
Our hypothesis is that PM exposure in this population will result in changes in vascular and endothelial response as assessed by flow-mediated dilatation of the brachial artery and various heart rate variability and blood endpoints.
This study and similar studies of susceptible populations are needed to provide the EPA with information regarding the health risks associated with ambient levels of UF PM.
Study Overview
Status
Completed
Conditions
Intervention / Treatment
Study Type
Interventional
Enrollment (Actual)
48
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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North Carolina
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Chapel Hill, North Carolina, United States, 27599
- EPA Human Studies Facility
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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
25 years to 70 years (ADULT, OLDER_ADULT)
Accepts Healthy Volunteers
No
Genders Eligible for Study
All
Description
Inclusion Criteria:
- Age between 25-70 years old
Metabolic syndrome as defined by the participant having at least three of the following criteria:
- Abdominal obesity: Men waist circumference >102 cm (>40 in) Women waist circumference >88 cm (>35 in)
- Triglycerides: ≥150 mg/dL
- HDL cholesterol: Men <40 mg/dL and Women <50 mg/dL
- Blood pressure: ≥130/≥85 mmHg OR have a history of high blood pressure requiring medication
- Fasting glucose: ≥100 mg/dL and ≤126 mg/dL
- Normal resting electrocardiograph (ECG).
Exclusion Criteria:
- Current smoker or smoking history within 3 months of study (defined as more than one pack of cigarettes in the past 3 months).
- Oxygen saturation below 95% at the time of physical exam.
- Blood pressure ≥160/≥100 mmHg
- Fasting blood glucose >126 mg/dl
- Hypersensitivity to nitroglycerin or other nitrates
- Any chronic medical condition including active pulmonary disease, cardiovascular disease (coronary artery disease, heart failure, rhythm disturbances, etc.), neurological disease, liver disease, kidney disease, muscular disease, diabetes, other endocrine disease, hematologic/lymphatic disease, immune deficiency or autoimmune disease.
- Medications specifically prohibited include nitrates or other vasodilators (exception here includes erectile dysfunction medications if the participant agrees to refrain for 96 hours prior to study), anti-arrhythmics, physician prescribed anti-inflammatory agents, physician prescribed antioxidants, insulin and other medications for the treatment of diabetes. Participants must refrain from all over-the-counter anti-inflammatory agents, including aspirin, ibuprofen, and naproxen, and anti-oxidants for a period of one week prior to exposure. Low dose aspirin and statin regimens are acceptable. Medications not specifically mentioned here may be reviewed by the investigators prior to a participant's inclusion in the study. Additionally, medication regimens must remain constant during the study.
- Hepatitis B carriers
- Skin diseases or sensitivity precluding the use of ECG electrodes
- Active cancer, history of cancer within the last 5 years, untreated cancer. Potential participants may have a history of mild, treated skin cancer provided the condition does not interfere with ECG electrode placement.
- No exposure will be conducted within 4 weeks of a respiratory tract infection.
- History of serve migraines
- Pregnant women or nursing mothers
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: BASIC_SCIENCE
- Allocation: RANDOMIZED
- Interventional Model: CROSSOVER
- Masking: SINGLE
Arms and Interventions
Participant Group / Arm |
Intervention / Treatment |
---|---|
Active Comparator: Ultrafine Air Pollution Particulate Matter
<2.5 microns concentrated from outside ambient air
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Ultrafine (particle diameter less than 2.5 microns) Air Pollution Particulate Matter, concentrated from the ambient air outside of the Chapel Hill EPA Human Studies Facility
Other Names:
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Sham Comparator: Filtered Air
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Filtered Air
Other Names:
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What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Changes in Vascular Function
Time Frame: change from baseline 0 hr after exposure, and change from baseline 20 hr after exposure. There will be at leat 2 weeks between the exposures
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change from baseline 0 hr after exposure, and change from baseline 20 hr after exposure. There will be at leat 2 weeks between the exposures
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Secondary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Changes in heart rate variability
Time Frame: change from baseline 0 hr after exposure, and change from baseline 20 hr after exposure. There will be at leat 2 weeks between the exposures
|
10 minute electrocardiogram recording (measure by Holter ECG) in which the subject has been resting for 20 minutes prior.
Collected on a Mortara H12+ 12-Lead ECG Recorder (Mortara Instrument, Inc., Milwaukee, WI).
The digitally recorded ECGs were sampled at 180 Hz and all data were stored on flash cards before processing.
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change from baseline 0 hr after exposure, and change from baseline 20 hr after exposure. There will be at leat 2 weeks between the exposures
|
Collaborators and Investigators
This is where you will find people and organizations involved with this study.
Sponsor
Collaborators
Investigators
- Principal Investigator: Robert B Devlin, PhD, US EPA
- Principal Investigator: Candice B Smith, PhD, US EPA
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
December 1, 2004
Primary Completion (Actual)
June 1, 2011
Study Completion (Actual)
October 1, 2013
Study Registration Dates
First Submitted
November 14, 2011
First Submitted That Met QC Criteria
November 17, 2011
First Posted (Estimate)
November 22, 2011
Study Record Updates
Last Update Posted (Estimate)
November 7, 2013
Last Update Submitted That Met QC Criteria
November 5, 2013
Last Verified
November 1, 2013
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- XCON
- 04-1677 (Other Identifier: UNC IRB)
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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