Figure 6From: Algorithmic processing of pressure waveforms to facilitate estimation of cardiac elastance Use of the shear transform, A. The desired point for MN is P. However, in this example the global minimum of the waveform is P 1, which is the initial guess for MN. A shear transform of the pressure waveform between P 1 and MX reveals a minimum (P 2) outside the range of D, and hence the time of P 2 is taken as the time of MN.Back to article page