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Infantile spasms management

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"Infantile Spasms" AND treatment

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infantile spasms treatment guideline ACTH prednisolone vigabatrin 2025

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https://pmc.ncbi.nlm.nih.gov/articles/PMC9643068

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PMID: 41762758

Infantile epileptic spasms syndrome (IESS, formerly West syndrome) is a pediatric neurologic emergency. Suspected spasms require urgent assessment by a pediatric neurologist or epilepsy service, ideally within days. Do not wait to see whether they settle.

1. Confirm diagnosis promptly

  • Obtain a video-EEG that includes sleep, ideally capturing an event. Hypsarrhythmia supports the diagnosis but is not required.
  • Ask caregivers to record typical episodes. Spasms commonly occur in clusters, often on waking.
  • Begin etiologic evaluation alongside treatment:
    • Brain MRI
    • Genetic testing, often epilepsy gene panel with chromosomal microarray depending on context
    • Targeted metabolic tests where indicated
    • Look specifically for tuberous sclerosis complex and structural brain causes.
Guidance recommends EEG within a few days of suspicion and treatment immediately after confirmation, with clinical and EEG reassessment at about 14 days (IESS treatment guideline).

2. First-line treatment

The aim is complete cessation of clinical spasms and resolution of the abnormal EEG, not simply fewer events.

A. Hormonal treatment

For most infants without tuberous sclerosis or a contraindication to steroids, use one of:
  • High-dose oral prednisolone, or
  • ACTH given intramuscularly, according to a local pediatric epilepsy protocol.
ACTH/corticosteroids and vigabatrin are the therapies most likely to rapidly stop spasms; conventional antiseizure drugs alone are usually inadequate for first-line treatment. Katzung's Basic and Clinical Pharmacology, 16th Edition, section “Medications Effective for Infantile Spasms (West Syndrome).”

B. Vigabatrin

  • First choice in tuberous sclerosis complex (TSC).
  • Also used when hormonal therapy is contraindicated, unavailable, or as part of an initial combined regimen in some centers.
  • It requires counseling and monitoring for visual field/retinal toxicity. It may cause sedation and MRI signal changes in infants.

C. Combination therapy

Some guidelines support initial hormone plus vigabatrin where appropriate because it can increase early electroclinical remission. The choice between hormonal monotherapy and combination therapy should be made by the treating pediatric epileptologist, weighing cause, adverse effects, access, and family circumstances (guideline recommendations).
Evidence update: a 2026 umbrella review found high-dose hormonal therapy more effective than vigabatrin in IESS excluding TSC, while the added long-term benefit of combination treatment remained uncertain (PubMed PMID 41762758). This supports specialist-led individualized selection rather than delaying effective first-line treatment.

3. Reassess at 14 days

At approximately 2 weeks:
  • Ask whether all spasms have stopped, not merely reduced.
  • Repeat EEG with wake and sleep recording.
  • If spasms or epileptic EEG activity persist, escalate promptly. Do not continue an ineffective first-line regimen for weeks.
Typical next action is to switch or add another evidence-based first-line agent:
  • Hormonal treatment if vigabatrin was used first
  • Vigabatrin if hormonal treatment was used first
  • Consider combination therapy if not already used.

4. If treatment-resistant

Refer to a comprehensive pediatric epilepsy center. Options depend on the identified cause and may include:
  • Ketogenic dietary therapy
  • Topiramate, valproate, zonisamide, or benzodiazepines as second-line options
  • Epilepsy surgery evaluation for a focal resectable structural lesion
  • Etiology-specific therapies, for example management directed at TSC or a defined metabolic/genetic disorder.

5. Safety monitoring during treatment

ACTH/prednisolone

Monitor:
  • Blood pressure
  • Blood glucose
  • Weight and fluid retention
  • Infection or fever
  • Irritability, sleep disturbance, gastric symptoms
  • Electrolytes and adrenal suppression during tapering
Avoid live vaccines during significant immunosuppression and discuss infection exposure urgently with the treating team.

Vigabatrin

Monitor:
  • Visual function/retinal surveillance as feasible for age and local protocol
  • Excessive somnolence or poor feeding
  • MRI-related abnormalities if neurological deterioration occurs.

6. Developmental and family care

  • Start early intervention therapies promptly: physiotherapy, occupational therapy, speech/feeding support.
  • Provide seizure first-aid education and a written emergency plan.
  • Continue developmental, vision, hearing, and epilepsy follow-up because developmental impairment and later epilepsy syndromes remain possible even after spasm control. Adams and Victor's Principles of Neurology, 12th Edition, section “Infantile Spasms (West Syndrome).”
Immediate action: If an infant is having repeated clusters of sudden flexion or extension movements, regression, reduced interaction, or prolonged seizures, seek emergency pediatric assessment today.
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