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Non-Invasive Electrical Brain Stimulation Montages for Modulation of Human Motor Function
Published on: February 4, 2016
Extraoperative cortical stimulation of motor function in children
S Chitoku1, H Otsubo, Y Harada
1Division of Neurology and Department of Paediatrics, The Hospital for Sick Children, 555 University Ave., Toronto, Ontario, M5G 1X8, Canada.
Pediatric Neurology
|August 23, 2001
Summary
Younger children with epilepsy require higher electrical stimulation thresholds for motor cortex mapping. This is particularly true for those with neuronal migration disorders, necessitating careful adjustments during functional mapping.
Area of Science:
- Pediatric Neurology
- Neurosurgery
- Epileptology
Background:
- Accurate motor cortex mapping is crucial for epilepsy surgery planning in pediatric patients.
- Electrical cortical stimulation is a key technique for identifying functional brain areas.
- Understanding factors influencing stimulation thresholds can optimize surgical outcomes.
Purpose of the Study:
- To investigate factors influencing the amperage threshold for evoking functional responses in children with epilepsy.
- To compare stimulation thresholds between children with neuronal migration disorders and other pathologies.
- To determine the relationship between patient age and stimulation threshold for motor responses.
Main Methods:
- Retrospective review of 20 pediatric epilepsy surgery patients (4-18 years) who underwent subdural grid electrode placement.
- Extraoperative electrical cortical stimulation using 50-Hz biphasic pulses (0.2 ms duration) with a distance reference technique.
- Evaluation of amperage thresholds for primary motor responses and afterdischarges, grouped by underlying pathology.
Main Results:
- Amperage thresholds for primary motor function ranged from 2-20 mA (mean = 7.7 mA).
- A significant inverse relationship was observed between amperage threshold and age (P = 0.0005), with younger children requiring higher thresholds.
- Patients with neuronal migration disorders (Group A) required higher mean amperage (8.6 mA) compared to other disorders (Group B, 6.4 mA).
Conclusions:
- Age is a significant factor influencing motor cortex stimulation thresholds in pediatric epilepsy patients.
- Children with neuronal migration disorders exhibit higher amperage thresholds for motor functional mapping.
- These findings highlight the need for age- and pathology-specific adjustments in electrical stimulation parameters for effective motor cortex mapping in pediatric epilepsy surgery.
