[Reversible neuropsychological deterioration associated to zonisamide in a paediatric patient with tuberous...

Area of Science:

• Neuroscience
• Pediatric Neurology
• Epileptology

Background:

• Tuberous sclerosis complex (TSC) is a genetic disorder that can cause epilepsy.
• Refractory epilepsy often requires surgical evaluation.
• Neuropsychological assessments are crucial for evaluating cognitive function in epilepsy patients.

Observation:

• A case study of an 11-year-old boy with TSC and refractory left frontal epilepsy.
• High-dose zonisamide treatment was associated with cognitive deterioration.
• The Reliable Change Index was used to control for practice effects in assessments.

Findings:

• Zonisamide-induced cognitive deficits mimicked effects of the epileptogenic zone on the language-dominant hemisphere.
• Drug withdrawal led to significant improvements in overall intelligence, verbal comprehension, and language-related cognitive abilities.
• These improvements were observed beyond the expected practice effects from repeated testing.

Implications:

• Distinguishing drug-induced cognitive side effects from epilepsy-related deficits is critical for surgical decision-making.
• Careful medication management is essential in pediatric epilepsy patients undergoing presurgical evaluation.
• This case highlights the importance of comprehensive neuropsychological monitoring during epilepsy treatment.