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Difficulty: MediumPediatric Neurologic Disorders

A 3-week-old boy is brought to the pediatric clinic by his parents due to 'seizures'. The parents report that over the past week, the infant has exhibited repetitive, rhythmic jerking movements of his arms and legs. These movements occur exclusively when he is asleep and cease immediately when his limbs are gently held or when he wakes up. The infant was born at 39 weeks gestation via an uncomplicated vaginal delivery. He is exclusively breastfed, feeds vigorously, and has normal urine and stool output. On physical examination, the infant is alert and has normal tone, reflexes, and pupil reactivity. His anterior fontanelle is flat and soft. Skin examination reveals multiple 1- to 3-mm yellow-white pustules on a broadly erythematous base scattered across his chest and back. Which of the following statements regarding this patient's condition and management are correct? (Select 2 that apply)

  1. An electroencephalogram performed during an active episode would not demonstrate any epileptiform discharges.Answer
  2. The abnormal movements are expected to resolve spontaneously without intervention by 2 to 6 months of age.Answer
  3. C
    This clinical presentation is highly predictive of delayed acquisition of gross and fine motor milestones.
  4. D
    The cutaneous findings mandate prompt hospitalization and initiation of intravenous acyclovir.
  5. E
    The patient should receive a live-attenuated viral vaccine during this visit to prevent post-infectious meningoencephalitis.

Answer

The correct statements are that an electroencephalogram (EEG) performed during an active episode would not demonstrate any epileptiform discharges, and the abnormal movements are expected to resolve spontaneously without intervention by 2 to 6 months of age.
The patient's clinical presentation is highly characteristic of benign neonatal sleep myoclonus. This condition presents in the first few weeks of life with repetitive myoclonic jerks that occur exclusively during sleep and immediately cease when the infant is awakened or the limb is restrained. Because this is a non-epileptic phenomenon, an electroencephalogram (EEG) captured during an episode will show a normal background sleep architecture without any epileptiform discharges. The condition is entirely benign and self-limiting, typically resolving spontaneously between 2 and 6 months of age without any long-term neurologic sequelae. Reassurance is the only necessary intervention.

Step-by-Step Solution

1
Analyze the infant's neurologic symptoms.
The rhythmic jerking occurs only during sleep and stops with gentle restraint or upon waking.
These are classic hallmark features of benign neonatal sleep myoclonus, differentiating it from true neonatal seizures which do not stop with physical restraint.
2
Evaluate the dermatologic findings.
Multiple yellow-white pustules on an erythematous base are observed in a healthy, vigorously feeding neonate.
This physical finding perfectly describes erythema toxicum neonatorum, a benign physiologic rash, effectively ruling out infectious etiologies like neonatal herpes simplex virus.
3
Determine the appropriate management and prognosis based on the clinical picture.
The condition is non-epileptic and benign, requiring no antiepileptic drugs, antiviral therapy, or immediate vaccinations.
Recognizing physiologic and benign neonatal conditions is crucial to prevent unnecessary hospitalizations, invasive testing, and inappropriate therapies.

Key Concept

Differentiating benign neonatal sleep myoclonus and erythema toxicum neonatorum from true neonatal seizures and infectious etiologies.
Estimated Time:1m 30s
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Topics

Pediatric Neurologic Disorders

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