Ankle–brachial pressure index

Ankle–brachial pressure index (ABPI) or ankle–brachial index (ABI) is a non-invasive method used in the diagnosis of peripheral arterial disease (PAD). The ABPI is the ratio of the blood pressure at the ankle to the blood pressure in the upper arm (brachium).

Etymology

The term "Ankle–brachial pressure index" is derived from the words "ankle", "brachial" and "pressure index". "Ankle" is derived from the Old English word "ancleow", which means "angle". "Brachial" is derived from the Latin word "brachium", which means "arm". "Pressure index" refers to the ratio of the blood pressure at the ankle to the blood pressure in the upper arm.

Procedure

The ABPI is calculated by dividing the systolic blood pressure at the ankle by the systolic blood pressure at the brachium. A low ABPI (less than 0.9) indicates a lower blood pressure at the ankle than at the brachium, which is a common symptom of PAD.

Clinical significance

The ABPI is a useful diagnostic tool for PAD, as it can help to identify patients who are at risk of developing the disease. A low ABPI is associated with an increased risk of cardiovascular events and mortality. In addition to its diagnostic value, the ABPI can also be used to monitor the progress of PAD and the effectiveness of treatment.

Related terms

• Peripheral artery disease
• Systolic blood pressure
• Cardiovascular disease

See also

• Toe–brachial pressure index

References

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