Figure 3.

Extended mathematical model of the oscillogram. (A) Parametric model of the arterial compliance curve [$g=\frac{df}{d{P}_e}$ in Equation (3)] that is physiologic and readily leads to formulas for explaining the oscillometric BP estimation algorithms of Figure 1. The model parameters α and β reflect the compliance curve widths over negative and positive transmural pressures, respectively, while γ denotes the compliance curve height. (B) Model of the derivative of the oscillogram (dO/dP_e = kg(P_d − P_e) − kg(P_s − P_e)) obtained from the derivative of the model shown in Figure 2 and the arterial compliance curve model shown in (A). (C) Model of the oscillogram obtained by integrating the derivative model shown in (B).