A nurse is caring for a postterm newborn who is 42 weeks ges… | 마이메르시 MyMerci
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Maternal Newborn Health
문제

A nurse is caring for a postterm newborn who is 42 weeks gestation. Which nursing intervention should be the priority for this infant?

해설
Postterm newborns are at high risk for hypoglycemia due to depleted glycogen stores and increased metabolic demands, making frequent blood glucose monitoring and early feeding the priority. Other options address infection, hyperbilirubinemia, or thermoregulation, which are less immediate concerns.
같은 주제 다음 문제A nurse is assessing a postterm newborn who was born at 42 weeks gestation. Which assessme…

심화 해설


Understanding the Priority for a Postterm Newborn

A newborn delivered at 42 weeks gestation is classified as postterm. These infants have exhausted the placental reserves that typically sustain them during the final weeks of pregnancy. As the placenta ages and begins to calcify, its ability to transfer oxygen and, critically, glucose to the fetus diminishes. This leads to a state of depleted glycogen stores at birth. While postterm newborns face several risks, including meconium aspiration syndrome and polycythemia, the immediate metabolic crisis they are prone to is hypoglycemia. The body's compensatory mechanisms are limited because the substrate (glycogen) is already low, and the infant's metabolic rate remains high. Therefore, the priority nursing intervention is vigilant monitoring of blood glucose levels to detect and manage this rapid decline before neurological sequelae occur.


Analyzing the Options


  • Option 1: Administer prophylactic antibiotics. Prophylactic antibiotics are not routinely indicated simply based on postmaturity. Antibiotic therapy is initiated when there are specific risk factors for or clinical signs of neonatal sepsis, such as maternal chorioamnionitis or prolonged rupture of membranes. Postmaturity alone, without evidence of infection, does not justify this intervention as a priority over a more immediate and common metabolic threat.

  • Option 2: Initiate phototherapy. Postterm infants are indeed at a higher risk for polycythemia, which can lead to increased red blood cell breakdown and subsequent hyperbilirubinemia. However, phototherapy is a treatment for jaundice that develops over time, not an immediate prophylactic measure at birth. The onset of pathologic jaundice typically occurs after the first 24 hours, making this a secondary concern to the acute risk of hypoglycemia in the immediate transition period.

  • Option 3: Place in a radiant warmer. Maintaining thermoregulation is a fundamental component of newborn care, as hypothermia can increase metabolic demand and exacerbate hypoglycemia. While placing the infant under a radiant warmer is an important supportive measure, it is an intervention that manages a contributing factor. The direct, independent nursing action that identifies the core problem is the blood glucose assessment itself. Monitoring is the priority action that guides the need for and type of subsequent interventions, including warming.

  • Option 4: Monitor blood glucose levels closely. This is the correct priority. Due to placental insufficiency and depleted glycogen stores, the postterm newborn has a significantly impaired ability to maintain euglycemia after the maternal glucose supply is cut off at birth. This is not a potential complication; it is a predictable metabolic emergency. Early and frequent point-of-care glucose monitoring allows the nurse to identify hypoglycemia rapidly and intervene with feeding or intravenous dextrose, preventing neuroglycopenic damage .




Connecting to the Reference Material

The provided research on meconium aspiration syndrome (MAS) highlights a critical co-morbidity that reinforces the importance of glucose monitoring. The study identifies that MAS is a life-threatening condition resulting from the aspiration of meconium-stained amniotic fluid, which is a common occurrence in postterm pregnancies due to fetal distress and passage of meconium in utero . An infant with MAS experiences severe respiratory distress, leading to increased work of breathing and a hypermetabolic state. This physiological stress drastically increases glucose consumption. When this elevated demand is superimposed on a postterm infant's already depleted glycogen stores, the risk of severe, symptomatic hypoglycemia becomes imminent. The management of a postterm newborn, especially one who may develop MAS, requires the nurse to anticipate this dual metabolic and respiratory challenge. Stabilizing blood glucose is foundational; a hypoglycemic brain cannot tolerate the hypoxemia that accompanies MAS, and conversely, hypoxemia from MAS will accelerate the metabolic crisis of hypoglycemia. Therefore, close glucose surveillance is the non-negotiable first step in preventing a cascade of multi-organ dysfunction .

임상 시나리오

Clinical Practice Guide: Postterm Newborn Hypoglycemia Screening

A 42-week gestation newborn is admitted to the well-baby nursery. The nurse prioritizes blood glucose monitoring based on the following evidence-based protocol.

  • Screening Initiation: Obtain point-of-care blood glucose at 1 hour of life, before the second feeding, or at any time symptoms of hypoglycemia (jitteriness, lethargy, poor feeding, temperature instability) are observed.
  • Frequency: For asymptomatic at-risk infants, screen before feeds for the first 12–24 hours. If initial glucose is < 40–45 mg/dL (2.2–2.5 mmol/L), increase frequency to every 1–2 hours and notify the provider.
  • Intervention Thresholds: Symptomatic hypoglycemia or glucose < 25–30 mg/dL (1.4–1.7 mmol/L) warrants immediate IV dextrose bolus (2 mL/kg D10W) and continuous infusion. Asymptomatic infants with glucose 30–45 mg/dL may be managed with feeding (breast milk or formula) and recheck in 1 hour.
  • Ongoing Monitoring: Taper monitoring once glucose levels remain stable > 50–60 mg/dL (2.8–3.3 mmol/L) for three consecutive pre-feed checks. Document all results and feeding tolerance.

Rationale: Postterm infants have depleted hepatic glycogen stores due to placental aging and insufficiency. They cannot mount an adequate counter-regulatory response, placing them at high risk for neuroglycopenic injury if hypoglycemia is not promptly identified and corrected.

핵심 개념

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