Doppler echocardiographic documentation of diastolic pulmonary artery forward flow

Global and Regional Right Ventricular Dysfunction in Pulmonary Hypertension

“…[20][21][22] From RV ejection velocities we measured the time interval between the onset of the Q-wave and the onset, peak, and end of ejection. The onset of diastole was taken from the end-ejection marked as the onset of the pulmonary component of the second heart sound (P2) of the superimposed phonocardiogram.…”

Biphasic Pulmonary Regurgitation

“…When atrial contraction follows, there is an increase in the intraventricular pressure, sometimes exceeding the pulmonary artery pressure, causing a late diastolic forward flow, seen on the Doppler tracing. 5 In this patient, the presence of moderate regurgitation resulted in a steeper deceleration slope and shorter duration of the CW Doppler tracing of pulmonary regurgitation. With atrial BIPHASIC REGURGITATION contraction, the resultant rapid increase in right ventricular volume and right ventricular diastolic pressure reached a point where right ventricular pressure became almost equal to the declining pulmonary artery diastolic pressure, with a resultant near cessation of the regurgitant flow.…”

“…When atrial contraction follows, there is an increase in the intraventricular pressure, sometimes exceeding the pulmonary artery pressure, causing a late diastolic forward flow, seen on the Doppler tracing. 5 In this patient, the presence of moderate regurgitation resulted in a steeper deceleration slope and shorter duration of the CW Doppler tracing of pulmonary regurgitation. With atrial 720…”

Restrictive Right Ventricular Physiology

“…A pulsed-wave (PW) Doppler of pulmonary arterial flow was obtained with the sample volume 1 cm distal to the pulmonary valve (3,4,7). Restrictive RV physiology was defined as the presence of antegrade pulmonary arterial flow in late diastole throughout the respiratory cycle (3,7). Prominent hepatic vein and superior vena cava diastolic flow reversals, if any, were recorded by PW Doppler and color M-mode techniques (4,8).…”

“…This late diastolic forward flow in the pulmonary artery coincided with premature pulmonary valve opening (3). Simultaneous catheter pressure monitoring demonstrated that this flow occurred when RV enddiastolic pressure equaled or exceeded pulmonary arterial diastolic pressure (3,7). Such findings suggested that RV compliance fell and the cavity became stiff and, therefore, acted as a passive conduit between the right atrium and the pulmonary artery during atrial systole.…”