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5-10. Explanation of Technical Terms
ABI (Ankle / Brachial Pressure Index)
ABI is calculated by the equation below.
Ankle systolic blood pressure
Brachial systolic blood pressure
(higher of left and right brachia)
The ABI can be used to diagnose arteriosclerosis obliterans and evaluate the health of the
cardiovascular system in the entire body. ABI is mainly used to evaluate atherosclerosis
(hardening of arteries due to an atheromatous plaque).
AI (Augmentation Index)
This indicates the percentage of the pressure wave effected in the carotid artery wave that is
reflected to form the reflected wave.
subtraction of the maximum wave height (P1) of the presystolic component.
Example of increasing AI value as the wave height of the post-systolic component rises
Example of decreasing AI value as the wave height of the pre-systolic component rises
%MAP (%Mean Arterial Pressure)
This value is one of the pulse waveform indices that are calculated from the blood pressure values.
It expresses as a percentage the mean value (P2) of the area of the PVR waveform divided by the
amplitude of the pulse (P1). This value is calculated as follows:
Pulse
pressure
Soft (i.e. 45%)
P expresses the post-systolic component (P2) after
P1: Pulse wave amplitude
P2: Mean value of the area
Hard (i.e. 38%)
Constricted (i.e. 50%)
(the level at which
and
are equal)
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