Examkin

Question

Difficulty: MediumPediatric Neurologic Disorders

A 7-month-old infant is evaluated in the neurology clinic for abnormal movements. For the past two weeks, the parents have noticed clusters of sudden, symmetric forward flexion of the neck and trunk, particularly upon awakening. Prior to this, the infant was able to sit with support and babble, but he has recently become less interactive and can no longer sit. On physical examination, vital signs are within normal limits. The infant cannot pull to stand. Skin examination under a Wood lamp reveals three distinct 2-cm hypopigmented macules on the torso. An electroencephalogram demonstrates a high-voltage, chaotic background with multifocal spikes and slow waves. Which of the following are correct regarding the evaluation and management of this patient? (Select all that apply)

  1. Initiation of vigabatrin is a first-line pharmacological treatment for this patient's seizure disorderAnswer
  2. An echocardiogram should be performed to screen for associated cardiac rhabdomyomasAnswer
  3. C
    The patient's inability to pull to stand at this age represents a significant gross motor delay requiring urgent specialist referral
  4. D
    The hypopigmented skin lesions should be empirically treated with systemic antimicrobial therapy
  5. E
    The live-attenuated varicella vaccine should be administered during this visit to ensure up-to-date immunizations

Answer

The correct steps include initiating vigabatrin for the infantile spasms and performing an echocardiogram to screen for cardiac rhabdomyomas.
The infant's presentation of symmetric flexion spasms, developmental regression, and an electroencephalogram showing hypsarrhythmia is diagnostic of infantile spasms (West syndrome). The presence of hypopigmented macules (ash-leaf spots) strongly points to Tuberous Sclerosis Complex (TSC) as the underlying etiology. In patients with TSC and infantile spasms, vigabatrin is the preferred first-line anticonvulsant due to its high efficacy in this specific population. Additionally, because TSC is a neurocutaneous syndrome associated with benign tumors in multiple organs, an echocardiogram is indicated to screen for cardiac rhabdomyomas, which are the most common cardiac tumors in affected infants.

Step-by-Step Solution

1
Identify the seizure type and EEG pattern
The clinical presentation of cluster flexion spasms with a chaotic, high-voltage EEG (hypsarrhythmia) is diagnostic of infantile spasms.
Accurate seizure classification dictates the specific pharmacological intervention.
2
Correlate seizures with physical exam findings to establish an underlying syndrome
The presence of infantile spasms combined with distinct hypopigmented macules (ash-leaf spots) strongly suggests Tuberous Sclerosis Complex (TSC).
TSC is a neurocutaneous disorder heavily associated with early-onset infantile spasms.
3
Select the appropriate diagnostic and therapeutic next steps based on the syndrome
Vigabatrin is indicated as the first-line treatment for TSC-associated infantile spasms, and an echocardiogram is indicated to screen for cardiac rhabdomyomas.
Standard of care for TSC requires tailored anticonvulsant therapy and systemic tumor screening.

Key Concept

Diagnosis and multisystem management of Tuberous Sclerosis Complex presenting with infantile spasms
Estimated Time:1m 30s
Rate this question

Topics

Pediatric Neurologic Disorders

More questions from this topic