问题
单项选择题
A child, age 4, is admitted with a tentative diagnosis of congenital heart disease. When assessment reveals a bounding radial pulse coupled with a weak femoral pulse, the nurse suspects that the child has（）
A. patent ductus arteriosus.
B. coarctation of the aorta.
C. a ventricular septal defect.
D. truncus arteriosus.
答案
参考答案：B
解析：
Coarctation of the aorta causes signs of peripheral hypoperfusion, such as a weak femoral pulse and a bounding radial pulse. These signs are rare in patent ductus arteriosus, ventricular septal defect, and truncus arteriosus.