What are modes of heat loss in the newborn? Choose all that apply.
Perspiration.
Evaporation.
Conduction.
Radiation.
Convection.
Urination.
Correct Answer : B,C,D,E
Choice A rationale
Perspiration involves the active secretion of sweat by the sweat glands; this mechanism is typically immature and inefficient in newborns, especially preterm infants, making it a minor and ineffective mode of heat loss, and more likely to lead to dehydration than effective thermoregulation. Heat loss usually occurs through other passive mechanisms.
Choice B rationale
Evaporation is the loss of heat that occurs when water is converted to vapor, such as from the amniotic fluid on the skin immediately after birth or from wet linens. This process can cause significant and rapid heat loss in a newborn if the infant is not quickly dried and placed under a radiant warmer, requiring immediate intervention.
Choice C rationale
Conduction is the loss of heat from the newborn's body to a cooler surface through direct contact. This can happen when the infant is placed on an un-warmed mattress, scale, or examining table. Using pre-warmed surfaces and blankets minimizes this type of heat transfer away from the infant's core temperature.
Choice D rationale
Radiation is the transfer of heat from the newborn's body to a cooler object nearby but not in direct contact, such as a cold window or wall of the incubator. This is a major route of heat loss and is minimized by using double-walled isolettes or placing cribs away from cold exterior surfaces.
Choice E rationale
Convection is the loss of heat from the newborn's body surface to the cooler surrounding air currents. This heat loss can be exacerbated by drafts from open doors, air conditioning vents, or the flow of oxygen. Maintaining a neutral thermal environment and avoiding drafts are key interventions to minimize convective loss.
Choice F rationale
Urination involves the excretion of urine, a fluid at body temperature. While the act removes a small amount of heat, it is not considered one of the primary or significant modes of neonatal heat loss, which are dominated by the physical processes of evaporation, conduction, radiation, and convection due to the newborn's large surface-area-to-mass ratio.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
Choice A rationale
The principle of supply and demand, mediated by prolactin and the removal of the inhibitory protein feedback inhibitor of lactation (FIL), dictates that frequent, effective milk removal is the primary stimulus for milk synthesis. During growth spurts, an infant's increased demand and subsequent frequent emptying of the breasts signal the body to up-regulate the production of milk to meet the heightened caloric and volume needs, reinforcing optimal supply.
Choice B rationale
Human milk is naturally low in both Vitamin D and iron because, evolutionarily, infants relied on their prenatal iron stores (lasting about 6 months) and sun exposure for Vitamin D. Commercial formulas are fortified with these nutrients, typically making them higher in both Vitamin D and iron compared to un-supplemented human milk.
Choice C rationale
Breast milk composition changes during a single feeding. The milk released at the start (fore milk) is watery and lower in fat to satisfy thirst, while the milk released at the end (hind milk) is creamy and significantly higher in fat to satisfy caloric needs. This transition is essential for ensuring infant satiety and weight gain.
Choice D rationale
Colostrum, the thick, yellow pre-milk fluid produced in the first few days, is highly concentrated and richer in certain components, particularly immunoglobulins (antibodies like secretory IgA), proteins, and minerals, than mature milk. It has a high concentration of immune factors and growth factors and is perfectly suited for the newborn's needs.
Correct Answer is D
Explanation
Choice A rationale
Reducing fluid intake is ineffective and potentially harmful because milk production is an active physiological process involving water. Dehydration could negatively impact overall maternal health, including kidney function, and does not directly address the underlying cause of engorgement, which is vascular congestion and accumulated milk. Adequate hydration is essential for maintaining optimal milk volume.
Choice B rationale
Using a breast pump whenever engorged can be counterproductive because the principle of supply and demand dictates that frequent, vigorous milk removal signals the body to produce more milk, potentially worsening the engorgement cycle. It is only helpful to pump a small amount to soften the areola just before feeding.
Choice C rationale
Skipping feedings to "rest" sore breasts is the opposite of the required action. Milk stasis and non-removal are the primary causes of engorgement. Allowing milk to build up further increases pressure, leading to greater discomfort, potential blocked ducts, and even increased risk of mastitis, hindering the resolution of engorgement.
Choice D rationale
Frequent and effective milk removal, typically every 2-3 hours, is the most crucial action to resolve engorgement. This relieves the pressure from milk stasis, stimulates the let-down reflex, and ensures the breast is adequately drained, which down-regulates future milk production to meet the infant's actual needs, thus reducing the swelling. —.
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