144
5-10. Explanation of Technical Terms
PVR
(Pulse Volume Record)
This is a record of the size of the pulse wave. The device measures this from the arm cuffs and
ankle cuffs.
PWV
(Pulse Wave Velocity)
Pulse wave velocity is the speed at which the pulse is transmitted from the heart to the end artery
when blood is expelled during contraction. The harder the arteries, the faster the pulse travels.
This is mainly used to evaluate hardness of the artery wall.
The PWV is calculated as follows:
The wave velocity in the arteries can be measured at the following sites, allowing PWV values to
be calculated for each. In general the device uses the "right brachial - ankle PWV (baPWV)" as the
PWV.
• Ascending aorta - carotid artery hcPWV
• Ascending aorta - right brachial hbPWV
• Ascending aorta - femoral artery hfPWV
• Femoral artery - ankle PWV faPWV
• Right brachial - ankle baPWV
• Ascending aorta -ankle PWV haPWV
TBI
(Toe Brachial Index)
The TBI is calculated as follows:
This index is an evaluation of the severity of constriction and blockage of lower limb peripheral
arteries. It is mainly used to evaluate blockage of blood flow in peripheral arteries of patients with
the following diseases or conditions.
• Diabetes
• Dialysis patients
• Burger's disease (TAO)
• Collagen disease
L (distance)
PTT (Pulse Transit Time)
Ankle systolic pressure
Brachial systolic pressure
(higher of left and right brachia)
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