alexa Usefulness of the Ankle-Brachial Index

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Usefulness of the Ankle-Brachial Index

The preferred method to calculate the Ankle-Brachial Index (ABI) for the diagnosis of Peripheral Arterial Disease (PAD) is to measure by the Doppler method the systolic pressures of the left and right brachial arteries in addition to the dorsalispedis and posterior tibial arteries in each leg [1,2]. For each leg, the higher of the dorsalispedis and posterior tibial pressures is divided by the higher brachial pressure, and the lower overall ABI of the 2 legs is used to diagnose the presence or absence of PAD. The cuff size should be appropriate with a width at least 40% of the limb circumference [2]. The ankle cuff should be placed just above the malleoli with the straight wrapping method [2]. The cuff should not be placed over a distal bypass to avoid the risk of bypass thrombosis [2]. The patient should be at rest for 5 to 10 minutes in the supine position, relaxed, head and heels supported, in a room with a temperature between 66˚ to 72˚Farenheit. The patient should not smoke for at least 2 hours prior to measurement of the ABI


Aronow WS (2014) Usefulness of the Ankle-Brachial Index. Angiol 2:e106.

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