单选题
1分
A 6-week-old female infant exhibits dry scaly skin and a protruding tongue after having trouble brea...
A 6-week-old female infant exhibits dry scaly skin and a protruding tongue after having trouble breast-feeding. A diagnosis of congenital hypothyroidism is made. The mother asks the nurse why the child was not diagnosed with this condition at birth. Which of the following would be the nurse's best response?
参考答案: D
参考解析: With congenital hypothyroidism, failure of normal development occurs during the embryonic period or when an inborn error of metabolism prevents the normal synthesis of thyroxine. Although the condition is present at birth, maternal thyroxine can pass through the placenta to the fetus, supplying the fetus and neonate sufficiently. Thus, in most neonates, the signs of hypothyroidism are commonly masked at birth.