A nurse is assessing a newborn who was born at 38 weeks gestation and weighs 2,100 grams. Which assessment finding would be most characteristic of a small for gestational age (SGA) newborn?
1Loose, wrinkled skin with minimal subcutaneous fat✓ 정답
2Large fontanelles with wide suture lines
3Abundant lanugo covering the entire body
4Weak muscle tone with poor reflexes
해설
SGA newborns have loose, wrinkled skin with minimal subcutaneous fat due to intrauterine growth restriction. Other options are more characteristic of preterm or other conditions.
Clinical Judgment
This question assesses the ability to identify the most characteristic physical finding of a small for gestational age (SGA) newborn. The key is understanding the impact of chronic intrauterine growth restriction (IUGR) on subcutaneous fat and muscle mass. SGA newborns have reduced fat and muscle stores due to insufficient nutrient supply, but brain growth is often relatively preserved (asymmetric IUGR). This causes the skin to appear loose and wrinkled because it is too large for the body. The other options are more closely related to characteristics of preterm infants.
Memory Tip: Think of SGA as Wrinkled Skin, Wasted. In contrast, preterm infants have more prominent features like Lanugo, Lax tone.
KR vs US: Both Korea and the US share the same definition of SGA (below the 10th percentile for gestational age) and basic management principles (prevention of hypoglycemia and hypothermia, nutritional support). However, US NGN questions often emphasize clinical judgment based on these characteristic findings (the 'Recognizing Cues' step of the CJMM) and the subsequent prioritization of interventions.
임상 시나리오
Clinical Practice Guide
The most important initial interventions when caring for an SGA newborn are prevention and early detection of hypoglycemia. Due to insufficient glycogen stores, the first feeding should be started within 1–2 hours after birth, and regular blood glucose monitoring should be performed. Additionally, because reduced subcutaneous fat makes thermoregulation difficult, a neutral thermal environment should be maintained, and immediate drying and warming should be prioritized.
Caution: Do not confuse the characteristics of SGA with those of preterm infants. The question specifies "38 weeks gestation," so this is not a preterm infant. "Large fontanelles/wide sutures" and "Abundant lanugo" are features of immaturity relative to gestational age, meaning they are characteristics of preterm infants.
핵심 개념
Small for Gestational Age — Newborns whose birth weight is below the 10th percentile for their gestational age. This is a result of intrauterine growth restriction (IUGR).
Intrauterine Growth Restriction — Fetal condition not reaching expected growth potential. Main cause of SGA.
Asymmetric IUGR — A type of IUGR where head (brain) growth is relatively preserved, but abdominal circumference and muscle/fat mass are markedly reduced. It is associated with the "wrinkled skin" finding commonly seen in SGA newborns.
Lanugo — Soft downy hair covering the body during the fetal period. It is more abundant and persists longer in premature infants, and decreases as the infant approaches full term.
Neutral Thermal Environment — An environment where a newborn can maintain normal body temperature with minimal energy expenditure. This is especially important for SGA newborns, as they have less subcutaneous fat and are vulnerable to temperature regulation issues.