Pasesa AVE-2000 Pro - Vascular Indices and Measurement Formulas; Arterial Pressure Volume Index (API) Explained; CSBP and CAPP Estimation Formulas

- 5 -
Vr Vr
VfVf
P1
P1
P2
P2
Differential
Pulse
Pulse
Pt
dPt
dt
Youngsters
Arteries Sffening by Aging
Oldsters
AVI = (Vr/Vf) x 20
• API (Arterial Pressure Volume Index)
API is a new vascular index that developed jointly by AIST and Shisei Datum in Japan.
Principle: The more elasc the arteries are, the more drasc the arterial volume changes when
the cu pressure decreases. The blood vessel sness is converted into numerical values using
the gradient of the curve as an index. The higher the value is, the higher risk of upper-arm arterial
sness it represents. The cu pressure-artery volume curve is rstly measured by a cu with a
decreasing working pressure, then the curve is ed with an arctan funcon (A*arctan(B*X+C)+D).
Finally, API is dened as the reciprocal of coecient B (API=1/B).
CSBP (Estimated Value) & CAPP (Estimated Value)
• CSBP (Central Systolic Blood Pressure, estimated value)
It is cobtained by taking age, radial artery systolic pressure, pulse pressure, arterial velocity pulse
index, arterial pressure volume index and other parameters as independent variables.
CSBP (Esmated Value) = 0.0447*age + 0.8392*PSBP + 0.1793*PDBP + 0.2718*AVI + 0.2881*API +
2.3339
• CAPP (Central Aortic Pulse Pressure, estimated value)
It is cobtained by taking age, radial artery systolic pressure, pulse pressure, arterial velocity pulse
index, arterial pressure volume index and other parameters as independent variables.
CAPP (Esmated Value) = 0.1613*age + 0.0923*PSBP + 0.8192*PPP + 0.2024*AVI + 0.2537*API -
13.1126