Examkin

Question

Difficulty: HardNeonatal Disorders

A 48-hour-old male neonate is evaluated in the newborn nursery during routine morning rounds. He was born at 39 weeks gestation via spontaneous vaginal delivery. His 22-year-old mother had prolonged rupture of membranes for 20 hours and developed a temperature of 38.2°C (100.8°F) shortly before delivery. She received two doses of intravenous ampicillin intrapartum. The infant's Apgar scores were 8 and 9 at 1 and 5 minutes, respectively. The infant's vital signs are temperature 37.1°C (98.8°F), heart rate 145/min, and respiratory rate 42/min. He is exclusively breastfeeding, latching well, and has had appropriate urine and meconium output. Physical examination reveals an alert, vigorous neonate. There is a prominent rash consisting of scattered 1- to 3-cm erythematous macules, many containing a central 1- to 2-mm pale-yellow pustule, distributed over the chest, abdomen, back, and proximal extremities. The palms and soles are completely spared. A complete blood count obtained at 24 hours of life shows a leukocyte count of 18,500/mm³ with 65% neutrophils and 10% bands. Which of the following is the most appropriate next step in the management of this patient?

  1. Reassurance and continued clinical observationAnswer
  2. B
    Obtain blood and cerebrospinal fluid cultures, and start intravenous ampicillin and gentamicin
  3. C
    Administer intravenous acyclovir
  4. D
    Apply topical mupirocin to the skin lesions
  5. E
    Perform a skin scraping of a pustule for Gram stain and bacterial culture

Answer

Reassurance and continued clinical observation is the most appropriate next step because the infant has a benign rash (Erythema toxicum neonatorum) and is clinically stable, making physiologic leukocytosis and maternal sepsis risk factors insufficient grounds for invasive workup.
The infant is clinically well and presents with erythema toxicum neonatorum (ETN), a benign, self-limiting neonatal rash. ETN classically appears between 24 and 72 hours of life as erythematous macules with central papules or pustules, characteristically sparing the palms and soles. The infant also has risk factors for early-onset sepsis (maternal fever, prolonged rupture of membranes). However, modern pediatric guidelines recommend that well-appearing, term infants born in the setting of maternal chorioamnionitis be managed with close clinical observation rather than immediate laboratory evaluation or empiric antibiotics. Furthermore, a leukocyte count of 18,500/mm³ with a mild left shift is a normal physiologic finding in a 24-hour-old neonate and does not indicate infection. Therefore, reassurance and continued observation is the correct management.

Step-by-Step Solution

1
Evaluate the infant's rash based on its appearance, distribution, and timing.
The rash consisting of erythematous macules with central pale-yellow pustules appearing at 48 hours and sparing the palms and soles is characteristic of Erythema toxicum neonatorum (ETN).
Identifying the specific dermatologic finding is crucial to distinguish a benign self-limiting condition from a serious infectious process.
2
Analyze the infant's complete blood count (CBC).
The leukocyte count of 18,500/mm³ with a mild left shift (10% bands) falls within the normal physiologic range for a 24-hour-old neonate.
Distinguishing physiologic neonatal leukocytosis from an infectious process prevents unnecessary clinical anxiety and interventions.
3
Assess the infant's risk for early-onset sepsis (EOS) in the context of their current clinical status.
Despite maternal risk factors (fever, prolonged rupture of membranes), the infant is born at term, is completely asymptomatic, and maintains normal vital signs.
Current pediatric guidelines dictate that well-appearing, term infants exposed to chorioamnionitis should be managed with close clinical observation rather than immediate empiric antibiotics.
4
Determine the next best step in management.
Because the infant has a benign rash and does not meet criteria for empiric sepsis treatment, reassurance and continued clinical observation is the correct action.
Avoiding over-treatment in stable, low-risk neonates aligns with antibiotic stewardship and standard pediatric protocols.

Key Concept

Management of well-appearing term neonates with benign rashes and maternal risk factors for sepsis
Rate this question

Topics

Neonatal Disorders

More questions from this topic