Fig. 3.

Illustration of parameters derived from blood pressure curve required by 2WK model based methods. Time-decay method: exponential decay of blood pressure during diastolic phase governed by time constant τ is illustrated with red-dots. Area method: area under the blood pressure curve indicated by C and blood pressure values at the beginning and end of this part of blood pressure curve are measured. Two-area method: A area and the sum of B and C areas enter the calculation procedure introduced in the text.