The nurse is teaching the mother of an inf

问题单项选择题

The nurse is teaching the mother of an infant with tetralogy of Fallot. The mother asks what to do when her infant becomes very blue and has trouble breathing after crying. The nurse should tell the mother（）

A. "Leave the infant alone until the crying stops. "

B. "Put the infant in the knee-chest position. "

C. "Offer the infant a bottle of formula. "

D. "Take the infant for a ride in the car. "

答案

参考答案：B

解析：

The infant is having a "tet" or blue spell, which is an acute spell of hypoxia and cyanosis. This occurs when the infant’s oxygen requirements are greater than what is supplied in the blood. Treatment involves placing the infant in the knee-chest position to reduce venous return from the extremities because that blood is desaturated. It also increases systemic vascular resistance, which causes more blood to be shunted to the pulmonary artery. Leaving the infant alone until the crying stops will cause an increase in cyanosis. An infant who is crying and having trouble breathing shouldn’t be offered a bottle because of the danger of aspiration. A ride in the car may quiet some infants, but it would be inappropriate in this situation.