A nurse places a newborn under a radiant warmer and monitors temperature hourly.
A nursing student asks why temperature regulation is so critical for newborns.

The nurse explains that maintaining body temperature primarily prevents:

Cold stress, which increases oxygen consumption and depletes glucose stores.

Vasoconstriction, which only affects the skin.

Tachycardia, which resolves on its own.

Respiratory depression, which is not clinically significant.

Answer and Explanation

The Correct Answer is A

Choice A rationale

Newborns possess a high surface-area-to-volume ratio and limited subcutaneous fat, making them highly susceptible to rapid heat loss. Cold stress triggers non-shivering thermogenesis, where the infant metabolizes brown adipose tissue. This metabolic process significantly increases oxygen consumption and accelerates the utilization of glucose. If prolonged, this leads to hypoxia, metabolic acidosis, and hypoglycemia. Normal axillary temperature for a newborn ranges from 36.5 degrees Celsius to 37.5 degrees Celsius. Maintaining the thermoneutral zone prevents these complications.

Choice B rationale

While peripheral vasoconstriction is a physiological response to cold, it is not an isolated skin event. It represents a systemic attempt to shunt blood toward vital organs to preserve core temperature. However, persistent vasoconstriction in a neonate can lead to decreased peripheral perfusion and may eventually contribute to pulmonary vasoconstriction. This can revert the infant to fetal circulation patterns, such as a patent ductus arteriosus, which complicates respiratory and cardiovascular stability beyond mere skin changes.

Choice C rationale

Tachycardia is an initial compensatory response to the metabolic demands of cold stress, but it is not a benign or self-resolving issue in this context. The increased heart rate reflects the infant's struggle to circulate oxygenated blood to tissues that are working harder to generate heat. If the underlying hypothermia is not corrected, the infant will eventually become exhausted, leading to bradycardia, decreased cardiac output, and potential cardiovascular collapse as energy and oxygen stores are completely depleted.

Choice D rationale

Respiratory depression is a very significant clinical finding in a newborn and is often a late sign of severe cold stress. As the infant's oxygen demands exceed their ability to ventilate, and as metabolic acidosis develops from brown fat metabolism, the respiratory drive may eventually fail. Labeling respiratory changes as insignificant ignores the reality that cold stress is a leading cause of respiratory distress syndrome and can necessitate intensive care interventions to prevent neonatal mortality.

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Correct Answer is C

Explanation

Choice C rationale

Evaporation is the loss of heat that occurs when liquid is converted to vapor. At birth, the infant is covered in amniotic fluid; as this fluid evaporates from the skin, it pulls significant heat away from the body. Drying the infant immediately and thoroughly with warm blankets is the primary nursing intervention to stop this process. This prevents cold stress, which can lead to increased oxygen consumption and metabolic acidosis in the newborn.

Choice D rationale

Warming the crib pad is an intervention specifically designed to prevent heat loss through conduction. Conduction is the transfer of heat from the newborn's body to a cooler solid surface in direct contact with the skin. While maintaining a warm sleep surface is an important part of thermoregulation, it does not address the moisture-based heat loss associated with evaporation. The removal of moisture from the skin is the only way to mitigate evaporative cooling.

A. Continue to document these observations. B. Start Pitocin. C. Notify the care provider immediately. D. Insert a Foley catheter.

Correct Answer is C

Explanation

Choice A rationale

Documentation is a necessary nursing responsibility, but it is not the priority when a fetal heart rate remains dangerously low. A prolonged deceleration, where the heart rate stays at 80 beats per minute for five minutes, indicates significant fetal distress and potential hypoxia. Failing to take immediate action beyond documentation could result in fetal injury or death. Priority must be given to interventions that address the underlying cause of the bradycardia.

Choice B rationale

Pitocin is a synthetic form of oxytocin used to induce or augment labor by increasing the frequency and intensity of uterine contractions. Administering Pitocin during a prolonged fetal heart rate deceleration is contraindicated because contractions can further decrease blood flow to the placenta and worsen fetal hypoxia. The goal in this situation is to relax the uterus and improve oxygenation, not to stimulate more activity that could stress the fetus.

Choice C rationale

A fetal heart rate of 80 beats per minute for five minutes constitutes a medical emergency known as a prolonged deceleration. Normal fetal heart rate is between 110 and 160 beats per minute. Since initial nursing interventions like repositioning and oxygen did not resolve the bradycardia, the healthcare provider must be notified immediately to evaluate the need for an emergency cesarean section or other urgent medical interventions to save the fetus.

Choice D rationale

Inserting a Foley catheter may be part of the preparation for an emergency cesarean section, but it is not the immediate priority over notifying the provider. The nurse must first ensure that the medical team is aware of the critical fetal status. While a catheter helps drain the bladder to provide better surgical access, the most time-sensitive action is communicating the sustained fetal bradycardia to a physician who can order a delivery.

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A nurse places a newborn under a radiant warmer and monitors temperature hourly. A nursing student asks why temperature regulation is so critical for newborns. The nurse explains that maintaining body temperature primarily prevents:

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Naxlex Comprehensive Predictor Exams

A nurse is assisting with the delivery of a newborn in the delivery room. How can the nurse prevent heat loss in the newborn resulting from evaporation?

Correct Answer is C

Explanation

Correct Answer is C

Explanation

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A nurse places a newborn under a radiant warmer and monitors temperature hourly.
A nursing student asks why temperature regulation is so critical for newborns.

The nurse explains that maintaining body temperature primarily prevents: