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Figure 1 Pulmonary venous flow velocity profile in a 60-year-old normal subject. Pulmonary venous systolic wave is usually greater than early diastolic wave. Note the pulmonary venous first systolic wave (S1) and pulmonary venous second systolic wave (S2). AR = pulmonary venous atrial reversal wave; D = pulmonary venous early diastolic wave.