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Determination of the cardio-ankle vascular index (CAVI). Ps, systolic blood pressure of brachial artery; Pd, diastolic blood pressure; haPWV, pulse wave velocity from the origin of the aorta to the ankle at mid pressure; ∆P, Ps-Pd; ρ, blood density; a and b, constants to convert the values of CAVI to those of Hasegawa's hfPWV; T, time of the pulse from aortic valve to the ankle; L, length of the arterial tree from the origin of aorta to the ankle.
