Figure 3 - Panel A, Pulsed Doppler velocities recorded at the outflow of the "ventricular" chamber showing a flow profile similar to that observed in the human left ventricular outflow tract. Panel B, Regurgitant jet as documented by color Doppler flow mapping in a biological prosthetic valve positioned at the "ventricular" inflow level. Panel C, Pulsed Doppler velocities recorded at the inflow of the "ventricular" chamber showing aliasing related to the regurgitant jet (produced in a biological prosthetic valve) and the inflow velocities without (left) and with (right) simulation of "atrial" contraction (arrow represents velocities related to "atrial contraction").