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Difficulty: MediumNeonatal Disorders

A 9-day-old male infant is brought to the pediatric emergency department by his parents due to a new rash on his head and decreased oral intake over the past 24 hours. The infant was born at 39 weeks gestation via vaginal delivery. Birth weight was 3,400 g (7 lb 8 oz) and APGAR scores were 8 and 9 at 1 and 5 minutes, respectively. Labor was complicated by fetal heart rate decelerations necessitating the placement of a fetal scalp electrode. Maternal group B Streptococcus screening was negative. Vital signs show a temperature of 38.1°C (100.6°F), heart rate of 165/min, and respiratory rate of 45/min. Physical examination reveals a cluster of 2- to 4-mm fluid-filled vesicles on an erythematous base located on the vertex of the scalp. The anterior fontanelle is flat, but the infant appears lethargic and is slow to respond to examination. Which of the following is the most appropriate next step in management?

  1. Admission for full sepsis workup and initiation of intravenous ampicillin, gentamicin, and acyclovirAnswer
  2. B
    Admission for blood and urine cultures, and initiation of intravenous ampicillin and gentamicin
  3. C
    Reassurance and routine newborn care
  4. D
    Application of topical mupirocin to the lesions and close outpatient follow-up
  5. E
    Prescription for oral cephalexin and discharge home with a 24-hour follow-up appointment

Answer

Admission for full sepsis workup and initiation of intravenous ampicillin, gentamicin, and acyclovir
The correct answer accurately outlines the mandatory management for a neonate presenting with signs of sepsis and a specific rash suggestive of Herpes Simplex Virus (HSV). The infant has fever, lethargy, poor feeding, and a vesicular rash on the scalp at the site of a prior fetal scalp electrode. This presentation is highly concerning for neonatal HSV infection, which is often acquired through the birth canal and can be inoculated via scalp monitors. Neonatal HSV can manifest as skin, eye, and mouth (SEM) disease, central nervous system (CNS) disease, or disseminated disease. Any febrile neonate (<28 days) with a vesicular rash requires hospital admission, a full sepsis workup (including lumbar puncture to evaluate for CNS HSV or bacterial meningitis), and immediate empiric intravenous therapy consisting of ampicillin, gentamicin, and acyclovir.

Step-by-Step Solution

1
Analyze the patient's age and vital signs.
The patient is a 9-day-old neonate with a documented fever of 38.1°C (100.6°F) and lethargy.
Any infant younger than 28 days with a fever requires a comprehensive evaluation to rule out life-threatening neonatal sepsis.
2
Evaluate the morphological characteristics and location of the rash.
The rash consists of clustered vesicles on an erythematous base, located precisely where a fetal scalp electrode was placed during delivery.
Vesicles on an erythematous base in a neonate are highly suspicious for Herpes Simplex Virus (HSV). The scalp monitor site provided a portal of entry for the virus during birth.
3
Synthesize findings to determine the most appropriate next step in management.
The clinical picture strongly suggests neonatal HSV with possible systemic or central nervous system (CNS) involvement, alongside the baseline risk for bacterial sepsis.
Immediate action includes hospital admission, a full invasive diagnostic workup (blood, urine, and cerebrospinal fluid cultures), and empiric treatment targeting both common bacterial pathogens (ampicillin and gentamicin) and HSV (acyclovir).

Key Concept

Neonatal Herpes Simplex Virus (HSV) Infection
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Topics

Neonatal Disorders

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