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Review Question - QID 105556

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QID 105556 (Type "105556" in App Search)
A 5-year-old girl presents to the physician with increased muscle cramping in her lower extremities after walking extended distances. The young girl is in the 10th percentile for height. Her past medical history is notable only for a cystic hygroma detected shortly after birth. Which of the following findings is most likely in this patient?

Decreased blood pressure in the upper and lower extremities

13%

41/304

Barr bodies on buccal smear

5%

15/304

Endocardial cushion defect

22%

68/304

Inferior erosion of the ribs

47%

144/304

Apparent hypertrophy of the calves

6%

17/304

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This patient is suffering from an aortic coarctation, which is associated with Turner syndrome.

Aortic coarctation is a congenital condition that is most often found when the aorta narrows in the region where the ductus arteriosus inserts. The narrowing creates a blood flow/pressure gradient resulting in a decrease in blood flow/pressure to the lower extremities. The vascular system compensates by increasing flow through other vessels including the subclavian and intercostal arteries thus leading to notching of the ribs (erosions from the vasculature). Similar to aortic stenosis due to the narrowing the left ventricle must generate significantly higher pressures to generate blood flow throughout the peripheral circulation. In the long-term this can result in structural changes to the heart.

Incorrect Answers:
Answer 1: In general in coarctation associated with Turner Syndrome there is an increase in blood pressure in the upper extremities and a decrease in the lower extremities thus making the ankle brachial index a useful test.
Answer 2: Though Barr bodies are not a sensitive or specific test, one would expect to see an absence of Barr bodies (condensed X chromosome).
Answer 3: An endocardial cushion defect is due to defective neural crest cell migration and is seen commonly in Down Syndrome.
Answer 5: Atrophy of the lower extremities could be seen in aortic coarctation. In contrast pseudohypertrophy of the calves would be seen in Duchenne's muscular dystrophy.

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