Bauman W, Wann L S, Childress R, Weyman A E, Feigenbaum H, Dillon J
Am J Cardiol. 1979 May;43(5):1049-52. doi: 10.1016/0002-9149(79)90373-4.
In a patient with idiopathic dilatation of the pulmonary artery the pulmonary valve echogram showed a prominent mid systolic closing motion or notching indistinguishable from that seen in pulmonary hypertension. Normal right ventricular and pulmonary arterial pressures were recorded simultaneously with echocardiograms of the pulmonary valve.
