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Sponsors and Collaborators: |
The Cleveland Clinic Summit Doppler Systems, Inc. |
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Information provided by: | The Cleveland Clinic |
ClinicalTrials.gov Identifier: | NCT00452309 |
The purpose of this study is to test a correction factor which would allow ankle brachial indexes taken in the seated position to accurately predict an ankle brachial index taken in the supine position.
Condition |
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Peripheral Arterial Disease |
Study Type: | Observational |
Study Design: | Screening, Cross-Sectional, Defined Population, Prospective Study |
Official Title: | Validation of a Correction Factor for Measurement of an Accurate Ankle-Brachial Index in the Seated Position |
Estimated Enrollment: | 50 |
Study Start Date: | March 2007 |
Study Completion Date: | August 2007 |
Peripheral arterial disease (PAD) is a highly prevalent medical condition. Patients with PAD are usually diagnosed on the basis of a simple diagnostic procedure know as the ankle-brachial index (ABI). The ABI is the ratio of ankle pressure to arm pressure after measurement of blood pressures in the arms and legs using a hand-held Doppler device. In order for the ABI measurement to be accurate, the test is conducted with the patient in the supine position. This eliminates the influence of hydrostatic pressure on the ankle and toes which can lead to a falsely elevated reading. Unfortunately, many patients are unable to lie supine for ABI measurement, including: the wheel-chair bound, patients with degenerative disease of the spine or arthritis with chronic back pain, and patients with advanced cardiopulmonary disease and orthopnea.
Given the importance of detecting PAD across a broad spectrum of patients, there is a need to identify a mechanism for reliable measurement of the ABI for patients who cannot lie supine. The purpose of this study is to test a correction factor for the effects of hydrostatic pressure on the lower extremities to allow for accurate ABI calculation in the seated position.
100 Subjects with suspected arterial disease in the vascular lab will be enrolled. Arm, ankle, and toe pressure measurements will be made in the supine and seated positions. The seated ankle pressures will be corrected for hydrostatic pressure using a mechanical formula. The ABI and toe brachial index (TBI) will be calculated.
Ages Eligible for Study: | 60 Years and older |
Genders Eligible for Study: | Both |
Inclusion Criteria:
Exclusion Criteria:
United States, Ohio | |
Cleveland Clinic Foundation | |
Cleveland, Ohio, United States, 44120 |
Principal Investigator: | Heather L Gornik, M.D. | The Cleveland Clinic |
Study ID Numbers: | IRB 06-1007 |
Study First Received: | March 25, 2007 |
Last Updated: | September 25, 2007 |
ClinicalTrials.gov Identifier: | NCT00452309 History of Changes |
Health Authority: | United States: Cleveland Clinic Foundation Institutional Review Board |
peripheral arterial disease pad ankle brachial index abi PAD |
Peripheral Vascular Diseases Vascular Diseases |
Peripheral Vascular Diseases Vascular Diseases Cardiovascular Diseases |