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Figure 2: Apical four-chamber echocardiographic images are shown of all three infants. (a) The apical four-chamber view of the first case. The buttress of the atrial septum is completely fused with the parietal atrioventricular junction. Hence, there is no direct communication between the cavity of the left atrium and the ventricles. The right atrium has a biventricular atrioventricular connection. (b and c) The apical four-chamber views in the second (b) and third (c) cases. The atrial septum is deviated to the left, but is not fused to the parietal atrioventricular junction, permitting flow beneath the leading edge of the primary atrial septum

Figure 2: Apical four-chamber echocardiographic images are shown of all three infants. (a) The apical four-chamber view of the first case. The buttress of the atrial septum is completely fused with the parietal atrioventricular junction. Hence, there is no direct communication between the cavity of the left atrium and the ventricles. The right atrium has a biventricular atrioventricular connection. (b and c) The apical four-chamber views in the second (b) and third (c) cases. The atrial septum is deviated to the left, but is not fused to the parietal atrioventricular junction, permitting flow beneath the leading edge of the primary atrial septum