How a 3-D-Printed Heart Replica Helped Plan a Double Switch Procedure (Video)

This is a printed heart for a 10-year-old child who was born with congenitally corrected transposition of the great arteries and a double outlet right ventricle. So we see here the right atrium is connected with the left ventricle, and both great vessels come out of the right ventricle. This is the aorta, which is anterior, and the primary artery is posterior.



For the complexity of this lesion, the patient was routed for a univentricular heart in the form of an extracardiac Fontan circulation, where the IVC is hooked up to the right pulmonary artery and the SVC is hooked up to the right pulmonary artery, excluding the intracardiac repair.



Unfortunately, his Fontan circuit had failed, and he presented with protein-losing enteropathy. So the question was, could we convert this heart back into a biventricular repair by rerouting the inside of the heart into two functioning ventricles? The way to do this, in general, is something that’s called a double switch technique. In this particular patient, we were able to take that extracardiac conduit out, and through 3-D printing, we were able to see and open this. This is the real structure of his heart.



We saw that we can route the inferior vena cava into the tricuspid valve, and the pulmonary veins will drain into the mitral valve, which will be the left ventricle. Once we opened here, we were able to see and examine that this is the VSD, this would be routable to the aorta. So the left ventricle will eject through the VSD into the tunnel, and into the aorta.



We were only able to see that this is feasible with 3-D printing. The intracardiac anatomy is very difficult to see sometimes with only an echo, or other modalities, for that matter. This patient underwent reconstruction with a double switch technique, and he was discharged home with a two-functioning biventricular repair.