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 C
Explanation
Choice A rationale
Repaglinide is an oral diabetes medication that helps control blood sugar levels by causing the pancreas to produce insulin. However, it is not typically the first choice for treating gestational diabetes. It is usually used for type 2 diabetes and is not commonly recommended during pregnancy.
Choice B rationale
Glipizide is another oral diabetes medication that works by stimulating the pancreas to produce insulin. Like repaglinide, it is not typically used as a first-line treatment for gestational diabetes and is not commonly recommended during pregnancy.
Choice C rationale
Insulin is the most common treatment for gestational diabetes. It does not cross the placenta and thus does not cause hypoglycemia in the baby. It can be used safely during pregnancy and is effective in controlling blood glucose levels.
Choice D rationale
Acarbose is an alpha-glucosidase inhibitor, which works by slowing the absorption of carbohydrates from the intestine. It is not typically used in pregnancy due to lack of safety data.
Correct Answer is D
Explanation
Choice A rationale
Chadwick’s sign is a bluish discoloration of the cervix, vagina, and labia resulting from increased blood flow. This sign is commonly seen in early pregnancy, but it does not indicate the presence of blood in the peritoneum.
Choice B rationale
Chvostek’s sign is a clinical sign of existing nerve hyperexcitability seen in hypocalcemia. It refers to an abnormal reaction to the stimulation of the facial nerve. This sign is not related to a ruptured ectopic pregnancy.
Choice C rationale
Goodell’s sign is a significant softening of the vaginal portion of the cervix from increased vascularization. This vascular softening is seen in early pregnancy. It does not indicate the presence of blood in the peritoneum.
Choice D rationale
Cullen’s sign is the appearance of bruising in the skin around the umbilicus. It occurs when there is blood in the peritoneum, or intra-abdominal bleeding. In the case of a suspected ruptured ectopic pregnancy, Cullen’s sign would indicate the presence of blood in the peritoneum.
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