Table 2 Definitions and formulas of parameters used in the assessment of arterial stiffness
Parameter | Definition | Formula |
|---|---|---|
Aortic Compliance | The absolute change in vessel diameter (or area) for a given change in pressure | ΔD/ΔP |
Aortic Distensibility | The absolute change in vessel diameter (or area) for a given change in pressure | ΔD/(ΔP × D) |
Stiffness Index | The ratio of the natural logarithm of SBP/DBP to the relative change in diameter | ln(Ps/Pd)/((Ds-Dd)/Dd) |