Electrical Wada for pre-surgical memory testing: a case report.

Area of Science:

• Neurology
• Neurosurgery
• Epilepsy Research

Background:

• Intracarotid amobarbital procedure (Wada test) is crucial for assessing memory lateralization before epilepsy surgery.
• A patient with left temporal lobe epilepsy failed the Wada test, raising concerns for memory decline after surgery.
• The patient declined neuromodulation and opted for surgery, necessitating an alternative memory assessment.

Observation:

• A novel 'electric Wada' test was developed using hippocampal depth electrode stimulation.
• The patient demonstrated preserved memory function during electric Wada testing.
• This suggested adequate contralateral memory support for surgical intervention.

Findings:

• The patient underwent stereotactic laser amygdalohippocampotomy (SLAH) and remained seizure-free at 12 months.
• Post-surgical neuropsychological evaluation revealed no verbal or visuospatial memory decline.
• The electric Wada test accurately predicted preserved memory function, enabling successful surgical outcomes.

Implications:

• The electric Wada procedure offers a feasible alternative for memory assessment in epilepsy surgery candidates.
• This technique may improve surgical decision-making and reduce the risk of postoperative memory deficits.
• Further research is needed to optimize and validate the electric Wada paradigm for broader clinical use.