Index of ankle pressures

__BEZOBSAHU__ Ankle brachial pressure index ABPI, ankle brachial pressure index, ABPI, Doppler index, DI) is a non-invasive diagnostic method providing information on the ratio of arterial pressures on the upper and lower extremities.

This is an easily performed examination for the detection of asymptomatic atherosclerosis. The sensitivity and specificity of the examination is about 80%, the most reliable for ICHDK . Reduced values ​​predict further development of angina pectoris , MI , heart failure , ICHDK or CMP . False negative values ​​are usually obtained in patients with diabetes mellitus or mediocalcinosis . For these patients, we choose other methods (e.g. thumb-arm index, toe-brachial index ). [1] .

Calculation

We perform the actual calculation for both lower limbs separately. We divide the measured pressure on the lower limbs by the blood pressure value on the upper limbs (highest or highest average value). náhled|420px|stanovení ABI pomocí tužkové sondy ultrazvuku

$ABI={\frac {TK_{\text{kotník}}}{TK_{\text{paže}}}}$

Calculator

Hodnocení indexu ABI
mediocalcinosis	> 1.4
normal value	1–1.4
limit values	0.91–0.99
abnormal - DK ischemia	≤ 0.9

Measurement

Perfusion pressures are determined using a Doppler ultrasound examination or oscillometric measurement using the ABI system.

Doppler determination of ABI and oscillometric determination of ABI cannot be confused. Oscillometric examination overestimates low ABI values ​​and underestimates high ABI values . An oscillometric examination has a high negative predictive value, it is faster and its results do not depend on the experience of the examiner. It is therefore more suitable as an ICHDK screening method in primary care..

Discrepancies between results increase at ABI thresholds (especially in incompressible arteries with calcinosis). In these patients Doppler measurement of ankle pressure is the method of choice.

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