Fukuda VaSera VS-2000 Series, Operation Manual

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13-4
Chapter 13 Appendix
(6) Vascular length
(7) CAVI Measurement Value
There are following types of CAVI depending on the measurement locations.
R-CAVI: CAVI between the heart valve and the right ankle artery.
L-CAVI: CAVI between the heart valve and the left ankle artery.
R/L-CAVI are calculated from the brachial pulse wave obtained from the right brachial cuff and pulse waves obtained
from the right and left ankle cuffs.
[2] Oscillometric Method
This is an indirect blood pressure measurement method. Attach the cuff to the brachium, apply the pressure to the blood
vessels and gradually reduce the pressure. The blood pressure values are determined by analyzing the shape of the pulse
waves obtained during this process. The cuff pressure at the point where the pulse pressure wave sharply increases is
generally referred to as the systolic blood pressure, and the cuff pressure at the point where the pulse pressure wave sharply
decreases is referred to as the diastolic blood pressure.
[3] ABI (Ankle-Brachial Index)
The ABI (ankle brachial index) is a quotient obtained by dividing the ankle systolic blood pressure by the brachial systolic blood
pressure. It is an index used to evaluate the degree of stenosis and occlusion resulting from atherosclerosis in the lower limbs.
It is also called ABPI (ankle-brachial pressure index) or API (ankle pressure index).
R-ABI and L-ABI are obtained through the following formulas:
The typical brachial blood pressure is determined according to the following conditions:
Obtain the vascular length to calculate PWV.
• AF: Direct distance between the sternal border in the second intercostal
space and the femoral artery pulsating site.
• L1: Vascular length between the heart valve and the femoral artery
pulsating site (=1.3 × AF)
• L2: Direct distance between the femoral artery pulsating site to the center of
the knee joint
• L3: Direct distance between the center of the knee joint to the center of the
cuff applied to the ankle.
• L: Vascular length between the heart valve and ankle artery (= L1 + L2 + L3)
The PWV is obtained using the following formula.
• Heart valve - right (left) ankle artery PWV
Korotkoff Sound
Cuff Pressure
Amplitude Change of
Cuff Inner Pressure
Systolic BP
Diastolic BP
Right ankle systolic blood pressure
Left ankle systolic blood pressure
Typical brachial systolic blood pressure
Typical brachial systolic blood pressure
R-ABI =
L-ABI =