A newborn child has a murmur and is cyanotic. An echocardiogram reveals that the tricuspid valve failed to develop and so no blood flows between the right atrium and ventricle. This condi-tion is described with the term tricuspid:
a. regurgitation.
b. stenosis.
c. atresia.
d. transposition.
ANS: C
Tricuspid atresia is failure of the tricuspid valve to develop; consequently, there is no communi-cation from the right atrium to the right ventricle. In regurgitation, blood moves backward, but is not obstructed. In stenosis, blood flow is narrowed, but not totally obstructed. In transposition, the two great vessels are on opposite sides.
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