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  Echo 4C

Contributor: Jeffrey Delaney

Echo studies

Echo TEE Echo Subcostal

Tricuspid atresia (TA) implies complete agenesis of the tricuspid valve with loss of continuity between right atrium and right ventricle. Several associated cardiovascular malformations must be present for this lesion to be compatible with life: an atrial communication (ASD or PFO) must be present for systemic venous return to cross to the left atrium and be pumped from the left ventricle.

Relative or absolute hypoplasia of the right ventricle is an obvious consequence of the loss of direct AV connection. This can vary considerably, however, depending on the presence of a ventricular septal defect (VSD). A VSD will allow for entry of blood into the right ventricle and the pulmonary artery. If a VSD does not exist, the ventricle receives no flow and will be extremely small, with hypoplasia or atresia of the pulmonary valve and trunk. The echo shown on the left is a '4 chamber view' of a newborn with TA, a VSD and a small RV.

If the ventricular septum is intact, a separate systemic arterial-to-pulmonary source is required such as a PDA or an aorto-pulmonary collateral vessel.

Clinical considerations...

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