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Figure 5 (A) Examples of pulsed Doppler recordings of pulmonary vein flow (PVF) from pigs # 564, 566 and 569 at baseline paced at 70 beats/min (left panels) and ischemia paced at 70 beats/min (right panels). (B) Examples of left atrial (LA) pressure tracings (thick lines) from the same pigs, at baseline paced at 70 beats/min (left panels) and ischemia paced at 70 beats/min (right panels). White vertical arrows indicate 20 cm/s pulsed Doppler velocity scale. Note overall positive relation between LA peak a to x trough pressure difference and PVF early systolic peak velocity and inverse relation between height of LA pressure peak v wave or x trough and peak PVF late systolic wave velocity-time integral or peak velocity. The PVF late diastolic retrograde wave has been omitted. a = LA peak a pressure; c = LA peak c pressure; D = diastolic PVF wave; ECG = electrocardiographic tracing; ES = early systolic PVF wave; LS = late systolic PVF wave; P_pace = right atrial pacing artifact; R = EKG R wave; v = LA peak v pressure.