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Zorluk: OrtaNeonatal Disorders

A 12-day-old male infant is brought to the emergency department by his parents due to decreased oral intake, excessive sleepiness, and a new skin rash that developed 24 hours ago. He was born at 39 weeks of gestation via spontaneous vaginal delivery to a 24-year-old primigravida. A fetal scalp electrode was utilized during labor for continuous heart rate monitoring. The mother's prenatal course was uncomplicated, and her prenatal laboratory results were within normal limits. The infant's temperature is 38.6°C (101.5°F), heart rate is 170/min, and respiratory rate is 45/min. Physical examination reveals an ill-appearing, lethargic infant with a bulging anterior fontanelle and increased tone in all extremities. On the scalp, there are several small, clustered, fluid-filled vesicles on an erythematous base. Which of the following is the most appropriate next step in management?

  1. A
    Reassure the parents and recommend gentle washing with mild soap
  2. B
    Obtain appropriate cultures and administer intravenous vancomycin and meropenem
  3. C
    Prescribe topical mupirocin and oral cephalexin and schedule a follow-up appointment in 48 hours
  4. Obtain appropriate cultures and administer intravenous acyclovir, ampicillin, and gentamicinCevap
  5. E
    Obtain cerebrospinal fluid for polymerase chain reaction and withhold therapy until results are finalized

Cevap

Obtain appropriate cultures and administer intravenous acyclovir, ampicillin, and gentamicin.
The correct answer combines standard empiric neonatal sepsis coverage (ampicillin and gentamicin) with specific antiviral therapy (acyclovir). This 12-day-old infant presents with fever, central nervous system signs (bulging fontanelle, lethargy, hypertonia), and a vesicular rash at a site of local trauma (fetal scalp electrode). This triad is highly suggestive of neonatal herpes simplex virus (HSV) infection with CNS involvement. Because bacterial meningitis and sepsis cannot be reliably differentiated from viral meningoencephalitis based purely on clinical signs in neonates, broad coverage for standard bacterial pathogens (such as Listeria monocytogenes, Group B Streptococcus, and E. coli) using ampicillin and gentamicin must be administered concurrently with acyclovir immediately after obtaining blood, surface, and cerebrospinal fluid cultures.

Adım Adım Çözüm

1
Evaluate the clinical presentation and physical exam findings.
The neonate is febrile, lethargic, and has a bulging fontanelle along with a vesicular rash on the scalp.
Identifying systemic illness and central nervous system involvement is critical for determining the severity of the infection.
2
Correlate the rash characteristics and history with potential pathogens.
Clustered vesicles at the site of a fetal scalp electrode strongly suggest neonatal herpes simplex virus (HSV) infection.
Fetal scalp electrodes break the skin barrier and are a known risk factor for vertical transmission of HSV from the maternal genital tract.
3
Determine the appropriate empiric management.
Select intravenous acyclovir, ampicillin, and gentamicin.
Ill-appearing neonates under 28 days of age require empiric bacterial coverage (ampicillin and an aminoglycoside) plus acyclovir when HSV is clinically suspected.

Anahtar Kavram

Neonatal herpes simplex virus (HSV) infection presenting with CNS involvement and a vesicular rash requires immediate empiric treatment with intravenous acyclovir, ampicillin, and gentamicin after obtaining appropriate cultures.
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Neonatal Disorders

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