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Mechanisms of Disability in Peripheral Arterial Disease

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00046592
Recruitment Status : Completed
First Posted : October 1, 2002
Last Update Posted : February 18, 2016
Information provided by:
National Heart, Lung, and Blood Institute (NHLBI)

Brief Summary:
To determine the mechanisms by which atherosclerotic peripheral artery disease (PAD) causes functional impairment and to define the degree to which peripheral artery disease associated pathophysiologic findings change over time.

Condition or disease
Cardiovascular Diseases Arterial Occlusive Diseases Peripheral Vascular Diseases

Detailed Description:


Research demonstrates that men and women with lower extremity peripheral arterial disease (PAD) have poorer functioning than men and women without PAD. Preliminary data also indicate that more severe PAD at baseline, as measured by the ankle brachial index (ABI), is associated with a greater incidence of functional loss. However, the pathophysiologic mechanisms in the lower extremities responsible for PAD-related functional impairment and functional loss are not well defined.


The study cohort will consist of 790 individuals identified from three Chicago-area medical centers, of whom 500 will have PAD. Participants will undergo a baseline and two annual follow-up visits. Pathophysiologic findings in the lower extremities refer to reduced muscle mass, reduced muscle quality, and reduced peripheral sensory and motor function. Quality of muscle tissue is defined as the ratio of muscle force to muscle mass. Muscle mass will be measured with Computed Tomography (CT). Peripheral nerve function will be determined using surface electroneurography (ENG). Lower extremity functional measures will consist of measures pertinent to functioning during daily living and include six minute walk distance, seven-day physical activity level (assessed by accelerometer), walking speed, balance tests, and lower extremity muscle power.

The cross-sectional study will test the hypotheses that a) chronic lower extremity arterial ischemia is associated with specific pathophysiologic findings in lower extremity muscle and nerve and that b) these ischemia-related pathophysiologic findings are associated with lower extremity functional limitation.The longitudinal study will test the hypotheses that a) greater baseline lower extremity arterial ischemia as measured by ABI is associated with greater progression of pathophysiologic findings over two year follow-up and that b) greater ischemia-related pathophysiologic findings in the legs at baseline is associated with greater functional decline over two year follow up. Results will be used to develop interventions designed to improve lower extremity functioning and prevent functional decline in persons with PAD.

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Study Type : Observational
Study Start Date : August 2002
Actual Primary Completion Date : July 2007
Actual Study Completion Date : July 2007

Resource links provided by the National Library of Medicine

Information from the National Library of Medicine

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Ages Eligible for Study:   59 Years to 80 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
No eligibility criteria

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00046592

Sponsors and Collaborators
National Heart, Lung, and Blood Institute (NHLBI)
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OverallOfficial: Mary McDermott Northwestern University Feinberg School of Medicine
Layout table for additonal information Identifier: NCT00046592    
Other Study ID Numbers: 1185
R01HL071223 ( U.S. NIH Grant/Contract )
First Posted: October 1, 2002    Key Record Dates
Last Update Posted: February 18, 2016
Last Verified: January 2008
Additional relevant MeSH terms:
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Cardiovascular Diseases
Vascular Diseases
Peripheral Vascular Diseases
Peripheral Arterial Disease
Arterial Occlusive Diseases