Tricuspid Atresia

Tricuspid atresia means that the tricuspid valve didn't develop normally. As a result, the right ventricle may also not develop, and hence there is usually only a single ventricle.

Because there is no tricuspid valve, blue blood returning to the heart from the body cannot enter the right ventricle (see diagram). This blue blood then shunts across an atrial septal defect (ASD) to the left atrium, and mixes with the red blood returning from the lungs. The mixture of blue and red in the left atrium enters the single ventricle, and from there is ejected into both the aorta and the pulmonary artery.

Tricuspid atresia comes in a larger number of

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