Ankle-Brachial index

ABI. Adapted from TCT 2005

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Editors-In-Chief: C. Michael Gibson, M.S., M.D., Alexandra Almonacid M.D., Jeffrey J. Popma M.D.

Synonyms and keywords: ABI, ankle brachial index

Overview

• Ankle and brachial systolic pressures taken using a hand-held Doppler instrument
• Supine, after ~10 minutes rest
• The resting ABI should be used to stablish the lower extremity PAD diagnosis in patients with suspected lower extremity PAD
  • Exertional leg symptoms
  • Non healing wounds
  • 70 years and older or 50 years and older with history of smoking or diabetes
• ABI should be measured in both legs in all new patients with PAD of any severity to confirm the diagnosis and establish a baseline
• The toe-brachial index should be used to establish the lower extremity PAD diagnosis in patients in whom lower extremity PAD is clinically suspected but in whom the ABI test is not reliable due to noncompressible vessels (advance age or diabetes)
• Leg segmental pressure measurements are useful to establish the lower extremity PAD diagnosis when anatomic localization of lower extremity PAD is required to create a therapeutic plan.