# A newborn of a birthing parent with poorly controlled type 1 diabetes mellitus is admitted to the neonatal intensive care unit. The infant was born at 38 weeks gestation via cesarean section due to macrosomia, weighing 4,200 grams (9 lbs 4 oz). The infant's initial blood glucose level is 30 mg/dL, and vital signs are: heart rate 165 bpm, respiratory rate 68 breaths/min with mild retractions, temperature 97.2°F (36.2°C). The infant appears lethargic and has a weak cry. Which nursing intervention is the highest priority for this infant during the first 24 hours after birth?

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## 문제

A newborn of a birthing parent with poorly controlled type 1 diabetes mellitus is admitted to the neonatal intensive care unit. The infant was born at 38 weeks gestation via cesarean section due to macrosomia, weighing 4,200 grams (9 lbs 4 oz). The infant's initial blood glucose level is 30 mg/dL, and vital signs are: heart rate 165 bpm, respiratory rate 68 breaths/min with mild retractions, temperature 97.2°F (36.2°C). The infant appears lethargic and has a weak cry. Which nursing intervention is the highest priority for this infant during the first 24 hours after birth?

The nurse is caring for a newborn whose birthing parent has poorly controlled type 1 diabetes mellitus. The infant was born at 38 weeks gestation via cesarean section due to macrosomia, weighing 4,200 grams (9 lbs 4 oz). The infant's initial blood glucose level is 35 mg/dL, and vital signs are: heart rate 165 bpm, respiratory rate 68 breaths/min with mild retractions, temperature 97.2°F (36.2°C). The infant appears jittery and has a weak cry.

## 보기

1. Administer prophylactic antibiotics to prevent sepsis
2. Monitor for signs of respiratory distress syndrome
3. Assess for congenital anomalies and birth injuries
4. Monitor blood glucose levels and treat hypoglycemia **✔ 정답**

**정답: 4**

## 해설

Infants of diabetic mothers are at highest risk for hypoglycemia in the first 24-48 hours due to hyperinsulinemia. Monitoring and treating hypoglycemia is the priority to prevent neurological damage.

## 심화 해설

Understanding the Priority: Hypoglycemia in Infants of Diabetic Mothers (IDMs)

The clinical presentation of this infant—born to a parent with poorly controlled type 1 diabetes, macrosomic at 4,200 grams, with a blood glucose of 30 mg/dL, lethargy, and a weak cry—is a classic and urgent picture of neonatal hypoglycemia. While monitoring for respiratory distress, assessing for anomalies, and considering infection risk are all important aspects of care for an IDM, the immediate threat to this infant's neurological integrity is the critically low blood glucose. The brain is almost entirely dependent on glucose for metabolism in the neonatal period, and prolonged or severe hypoglycemia can lead to neuronal injury and adverse neurodevelopmental outcomes [1]. The systematic review of clinical guidelines underscores that the first 24 to 72 hours of life represent the highest risk period for this metabolic disturbance, making aggressive monitoring and treatment the cornerstone of immediate management [1].

The pathophysiology stems from maternal hyperglycemia, which leads to fetal hyperglycemia and compensatory fetal hyperinsulinemia. At birth, when the constant maternal glucose supply is abruptly severed, the infant's high circulating insulin level drives glucose into cells, rapidly depleting serum glucose. This hyperinsulinemic state is the direct cause of the hypoglycemia, and it also explains why infants like this one are often macrosomic; insulin is a potent fetal growth hormone . The prospective cohort study on glucose patterns in at-risk newborns confirms that IDMs have a significantly higher incidence of hypoglycemia, and the presence of combined risk factors, such as macrosomia and maternal preexisting diabetes, dramatically increases the odds of developing this condition [2]. Therefore, the intervention that directly addresses this life-threatening pathophysiology is the highest priority.

Why the Other Options Are Not the Highest Priority

- Option 1: Administer prophylactic antibiotics to prevent sepsis. While sepsis can also cause lethargy and temperature instability, this infant's presentation is most directly explained by the known history of poorly controlled maternal diabetes and the documented severe hypoglycemia. Prophylactic antibiotics are not indicated without specific risk factors for sepsis, such as maternal chorioamnionitis or prolonged rupture of membranes, which are not mentioned in the scenario. Treating the confirmed metabolic emergency takes precedence over a prophylactic measure for a possible infection .

- Option 2: Monitor for signs of respiratory distress syndrome. This infant is already showing signs of respiratory distress with a rate of 68 breaths/min and mild retractions. This is a critical finding that requires close monitoring and supportive care. However, the underlying cause of this distress in an IDM born at 38 weeks is often related to the delayed fetal lung maturity associated with maternal diabetes or transient tachypnea of the newborn, and it may be exacerbated by the metabolic acidosis from hypoglycemia. While monitoring is essential, it is not the highest priority intervention over directly correcting the documented, dangerously low blood glucose, which can itself cause or worsen respiratory symptoms .

- Option 3: Assess for congenital anomalies and birth injuries. IDMs, especially those born to parents with pregestational diabetes, have a higher risk of congenital anomalies (e.g., cardiac, neural tube defects) and birth injuries (e.g., shoulder dystocia, clavicular fracture) due to macrosomia . A thorough head-to-toe physical assessment is a standard of care and must be performed. However, this is a secondary assessment task. The immediate, life-threatening problem is the severe hypoglycemia, which requires intervention within minutes to prevent brain injury. The physical assessment for anomalies and injuries can and should proceed concurrently with, but not before, the stabilization of blood glucose [1].

Clinical Management and Rationale for Treatment

The priority intervention is to confirm the low blood glucose with a laboratory sample if not already done, and immediately treat the hypoglycemia to restore euglycemia, typically with an intravenous dextrose bolus followed by a continuous infusion, while providing frequent feedings if the infant is clinically stable enough to feed orally. The goal is to maintain blood glucose levels above operational thresholds, which guidelines generally define as >45-50 mg/dL in the first 48 hours of life [1]. A study on IDMs in Iraq reinforces that maternal type 1 diabetes is a significant predictor of severe neonatal hypoglycemia, highlighting the necessity for a preemptive and aggressive management protocol from the moment of birth . The GLEAN study further supports that infants with this combination of risk factors require intensive surveillance, as their glucose nadir often occurs within the first few hours after birth [2]. By prioritizing the correction of hypoglycemia, the nurse directly mitigates the risk of acute neurological compromise and supports the infant's overall physiological stability, which in turn can improve respiratory effort and thermoregulation.References (research sources)

- [1]Neonatal Hypoglycemia: A Systematic Review of International and Local Clinical Guidelines with Clinical Implications.GuidelineRusu C, Matyas M, Kramer BW, Dorobanțu FR, Bodog A. (2026) · DOI: 10.3390/jcm15103921

- [2]Glucose Levels in At-risk Newborns (GLEAN): a prospective cohort study on glucose profiles in infants at risk of hypoglycemia.Research articleYap F, Chan D, Zheng RT, Bos LS, Rajadurai VS, Chandran S. (2025) · DOI: 10.3389/fendo.2025.1599366

## 임상 시나리오

IDM Hypoglycemia: Immediate PriorityTreat the glucose before the brain suffers.
The highest risk for hyperinsulinemic hypoglycemia is in the first 24 to 72 hours of life. A symptomatic infant with a blood glucose of 30 mg/dL requires immediate intervention to prevent neuronal injury.

Do not delay treatment for other assessments. The priority is to confirm the low reading and administer a rapid-acting glucose source (e.g., IV dextrose or early feeding per protocol) to raise blood glucose to a target of >45 mg/dL.

CautionA common pitfall is focusing on potential respiratory distress or macrosomia complications while overlooking the immediate metabolic crisis. Lethargy and a weak cry are neurologic symptoms of hypoglycemia, not just prematurity or sepsis.

## 핵심 개념

- **Infant of Diabetic Mother** — Newborns born to mothers with diabetes (gestational or pre-existing). They are at high risk for various complications such as hyperinsulinemia, hypoglycemia, respiratory distress syndrome, hyperbilirubinemia, and congenital anomalies.
- **Neonatal Hypoglycemia** — Neonatal hypoglycemia. Generally, a condition where blood glucose is below 40-45 mg/dL. In IDM, hyperinsulinemia occurring in response to maternal hyperglycemia is the main cause. It can cause neurological damage, so prompt treatment is necessary.
- **Hyperinsulinemia** — Hyperinsulinemia. A condition where the blood insulin level is abnormally high. It is the core pathophysiology of IDM, occurring when the fetus responds to the mother's hyperglycemia by causing the pancreatic beta cells to secrete excessive insulin.
- **Macrosomia** — Macrosomia. When birth weight exceeds the 90th percentile for the gestational age (generally 4000g or more). It occurs due to maternal hyperglycemia and hyperinsulinemia promoting fetal growth, and increases the risk of delivery complications (shoulder dystocia).
- **Respiratory Distress Syndrome** — Respiratory distress syndrome. A breathing disorder in newborns primarily caused by a deficiency of pulmonary surfactant. IDM increases the risk due to a higher rate of cesarean sections and maternal hyperglycemia, which can delay lung maturation. Symptoms include rapid breathing, chest retractions, and grunting.

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