QuestionSBA
QuestionChoice
Incorrect - Atrial septal defects are non-cyanotic but would be associated with abnormal development in either the sinus venosus or the atria. It is not associated with abnormal septation of the truncus arteriosus and bulbus cordis.
10008321
b
Atrial Septal Defect
QuestionChoice
Incorrect - Tetralogy of Fallot is a cyanotic congenital heart defect. It is a combination of right ventricular hypertrophy, a ventricular septal defect with an overriding aorta, and pulmonary stenosis. This results from multiple areas of abnormal development, not just the truncus arteriosus and bulbus cordis.
10008322
c
Tetralogy of Fallot
QuestionChoice
Incorrect - Persistent truncus arteriosus is a cyanotic defect.
10008323
d
Persistent Truncus Arteriosus
QuestionChoice
Correct - Ventricular septal defects (VSDs) are non-cyanotic. The truncus arteriosus develops into the aorta and the pulmonary trunk through septum formation. Abnormal septation would lead to the development of a membranous VSD. The bulbus cordis develops into the outflow region of both ventricles
10008320
a
Membranous Ventricular Septal Defect
QuestionChoice
Incorrect - The foramen ovale provides a shunt in foetal circulation allowing blood to bypass the lungs. Typically it closes and becomes the fossa ovalis after birth, however it can sometimes remain open. It is not  associated with an abnormal septation of the truncus arteriosus and bulbus cordis.
10008324
e
Patent Foramen Ovale
Concept
Chapter
2693
3875
Formation of heart chambers
Topic
171
Embryology
14211
A baby boy is born with a congenital cardiac defect associated with an abnormal septation of the truncus arteriosus and bulbus cordis. On examination he appears pink and well-perfused.

Which of the following cardiac defects is the baby most likely to have?
a