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Figure 1 Follow-up transesophageal echocardiogram from a study patient. A, Echocardiogram at rest showing enlargement of the right ventricle and right atrium. An open atrial septostomy is clearly defined (arrow). B, Doppler demonstration of the functioning of septostomy is established by the existence of a mild right to left shunt at rest. Simultaneous measurement of SaO2% by pulse oxymetry at rest is 84%. C, Augmentation of right to left shunt at mild supine exercise can be clearly demonstrated. SaO2% decreased to 68% during this state.
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