A 22-year-old pregnant woman presents to her OB/GYN for a prenatal checkup. The fetal heart-beat sounds irregular, and a fetal echocardiogram reveals an atrioventricular canal (AVC) defect. This defect is the result of:
a. failure of the ductus arteriosus to close.
b. incomple fusion of the endocardial cush-ions.
c. a patent foramen ovale.
d. a right-to-left shunt.
ANS: B
AVC defect is the result of incomplete fusion of endocardial cushions. A patent ductus is the failure of the ductus arteriosus to close. The infant will not experience a patent foramen ovale. Flow is generally left to right, not right to left.
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