Two-chambered right ventricle: simulating two-chambered left ventricle.

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Abstract
Two cases [infants] are described of an unusual variant of 2-chambered right ventricle. In both, the ventricular septal defect was between the distal chamber of the right ventricle and the left ventricle. The extensive dividing septum between proximal and distal parts of the right ventricle converted the latter, hemodynamically, into part of the left ventricle. In the 1st case the distal chamber supported the aorta in the left anterior position, the pulmonary artery arising from the proximal part of the right ventricle. In the 2nd the pulmonary artery arose from the distal chamber and the aorta from the proximal chamber. In both the ventriculoarterial connection was double outlet right ventricle and there was functional arterial concordance in case 1 and discordance in case 2. The distal right ventricular chamber resembled the rudimentary chamber of a univentricular heart.