Figure 200h

The left upper panel : Sound and pressure correlates of S2 in a 45 year old woman with the normotensive atrial septal defect (shunt= 2:1). Wide, fixed splitting of S2 is demonstrated; P2 and A2 are coincident with their respective incisurae, and the duration of the hangout interval is nearly equal to the A2-P2 interval.
Upper right panel: Simultaneous right and left ventricular pressures clearly show that the duration of right and left ventricular systole is equal.
Lower left panel: Sound and pressure correlates of a patient with idiopathic dilation of the pulmonary artery. P2 is coincident with the incisura of the pulmonary artery and separated from the right ventricular tracing by a hangout interval of 90ms (almost identical to the splitting interval).
Lower right panel: Similar sound and pressure correlates in a patient with mild valvular pulmonary stenosis and aneurysmal dilation of the pulmonary artery. Most of the delay in P2 is due to a wide hangout interval of 56ms. In each patient all pressures are recorded by catheter- tipped micromanometers .

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