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Figure 3 (A) Example of pulsed Doppler PV flow velocity tracing from pig # 565 (baseline paced at 70 beats/min). White arrow indicates 20 cm/s pulsed Doppler velocity scale. Thick white arrow points at missing end-diastolic reverse wave. Black arrow indicates point of flow velocity nadir between the late systolic and early diastolic waves. (B) Example of pulsed Doppler left ventricular outflow tract (LVOT) velocity tracing from pig # 564 (baseline paced at 70 beats/min). a = start of LVOT velocity; b = peak LVOT velocity; c = end of LVOT velocity; D = early diastolic wave; ES = early systolic wave; LAP = left atrial pressure tracing; LS = late systolic wave; P_pace = right atrial pacing artifact; R = ECG R wave.