A nurse is caring for a preterm newborn who is in an incubator to maintain a neutral thermal environment. The father of the newborn asks the nurse why this is necessary.
Which of the following responses should the nurse make?
“Preterm newborns have a smaller body surface area than normal newborns”
“Preterm newborns lack adequate temperature control mechanisms”
“The heat in the incubator rapidly dries the sweat of preterm newborns”
“The added brown fat layer in preterm newborn reduces his ability to generate heat” .
The Correct Answer is B
Choice A rationale
While it is true that preterm newborns have a smaller body surface area than full-term newborns, this is not the primary reason for using an incubator. A smaller body surface area can contribute to heat loss, but the main issue is the lack of adequate temperature control mechanisms.
Choice B rationale
Preterm newborns lack the adequate temperature control mechanisms that full-term newborns have. They have less subcutaneous fat to insulate them and a higher surface area to volume ratio, which increases heat loss. They also lack the ability to shiver to generate heat.
Therefore, an incubator is used to maintain a neutral thermal environment.
Choice C rationale
The heat in the incubator does not rapidly dry the sweat of preterm newborns. In fact, preterm newborns do not sweat as efficiently as full-term newborns or adults, so they are less likely to lose heat through sweating.
Choice D rationale
The statement that the added brown fat layer in preterm newborn reduces his ability to generate heat is incorrect. In fact, preterm newborns have less brown fat than full-term newborns. Brown fat is a type of fat that generates heat when metabolized, and it is an important source of heat for newborns.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A rationale
While the fundus at the level of the umbilicus is a normal finding for a woman who is 4 hours postpartum, it is not the priority in this case. The fundus, which is the top part of the uterus, typically descends at a rate of approximately one fingerbreadth (or one cm) per day, and by the 12th postpartum day, it should no longer be palpable.
Choice B rationale
A saturated perineal pad in 30 minutes is a sign of excessive bleeding, also known as postpartum hemorrhage. This is a serious condition that can lead to shock and other complications if not treated promptly. Therefore, this finding should be prioritized by the nurse.
Choice C rationale
Approximated edges of an episiotomy are a normal finding in the postpartum period. An episiotomy is a surgical incision made in the perineum to enlarge the vaginal opening for delivery. After delivery, the episiotomy is sutured and should heal without complications with proper care. However, this is not the priority finding in this scenario.
Choice D rationale
Deep tendon reflexes 4+ could be a sign of preeclampsia, a pregnancy complication characterized by high blood pressure and signs of damage to another organ system, often the liver and kidneys. However, since the client is already 4 hours postpartum, this is less likely to be the priority.
Correct Answer is A
Explanation
Choice A rationale
This is the correct answer. In infants of mothers with poorly controlled diabetes, hyperinsulinemia can lead to increased oxygen consumption and metabolic rate, which can contribute to the development of respiratory distress syndrome.
Choice B rationale
Increased blood viscosity is not the most likely cause of respiratory distress in a macrosomic newborn of a mother with poorly controlled diabetes.
Choice C rationale
A brachial plexus injury is a potential complication of delivery for macrosomic infants, but it is not a cause of respiratory distress syndrome.
Choice D rationale
Increased deposits of fat in the chest and shoulder areas can make delivery more difficult and can increase the risk of birth injuries, but they are not the most likely cause of respiratory distress syndrome in a macrosomic newborn of a mother with poorly controlled diabetes.
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