MCQ – 89214


A 5-year-old child is brought to the physician by his parents because he develops cyanosis with minimal exertion. The parents tell you that he has experienced occasional cyanotic episodes that first began soon after he was born, and that they appear to be becoming more frequent. During the episodes, the child assumes a squatting position because it makes him “feel better.” The parents recently emigrated to the United States and the child has never been evaluated by a physician before today. On physical examination, he is found to have an enlarged right ventricle. Which of the following embryological events most likely underlies his condition?


Endocardial cushion defect


Aortic arch constriction


Abnormal neural crest cell migration


Pulmonary hypertension

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