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Updated: May 15, 2026
Stereo-Electro-Encephalo-Graphy (SEEG) With Robotic Assistance in the Presurgical Evaluation of Medical Refractory Epilepsy: A Technical Note
Published on: June 13, 2016
Depth electrodes in pediatric epilepsy surgery
Janani Kassiri1, Jeff Pugh, Sharon Carline
1Comprehensive Epilepsy Program, University of Alberta Hospital, Edmonton, Alberta, Canada.
Insights
Depth electrodes accurately identify the seizure focus in pediatric epilepsy patients with intractable seizures. This surgical approach leads to seizure freedom without complications, expanding surgical options for young patients.
Area of Science:
- Neurology
- Neurosurgery
- Pediatric Epilepsy
Background:
- Accurate localization of the epileptogenic zone is crucial for successful epilepsy surgery in medically intractable cases.
- Few studies have explored the utility of depth electrodes in pediatric epilepsy populations.
- Depth electrodes offer a potential solution for localizing the seizure focus when other methods fail.
Purpose of the Study:
- To evaluate the safety and efficacy of intracranial depth electrodes for localizing the epileptogenic zone in pediatric epilepsy patients.
- To describe the technical approach for depth electrode implantation and surgical resection.
- To present case studies illustrating the benefits of depth electrodes in complex pediatric epilepsy scenarios.
Main Methods:
- Retrospective review of 18 pediatric epilepsy patients who underwent depth electrode studies.
- Patients had medically intractable epilepsy and failed surface electroencephalogram (EEG) and magnetic resonance imaging (MRI).
- Depth electrode placement followed by cortical resection according to established surgical protocols.
Main Results:
- Successful identification of the ictal onset zone in all 18 pediatric patients.
- All surgically treated patients achieved seizure freedom (Engel class I).
- No neurological complications were reported post-surgery.
Conclusions:
- Intracranial depth electrode placement is a safe and effective method for identifying the epileptogenic zone in pediatric epilepsy.
- This technique expands surgical candidacy for pediatric patients previously deemed unsuitable for epilepsy surgery.
- Depth electrode utilization provides crucial information for successful surgical outcomes in pediatric epilepsy.
Background:
The surgical removal of the epileptogenic zone in medically intractable seizures depends on accurate localization to minimize the neurological sequelae and prevent future seizures. To date, few studies have demonstrated the use of depth electrodes in a pediatric epilepsy population. Here, we report our study of pediatric epilepsy patients at our epilepsy center who were successfully operated for medically intractable seizures following the use of intracranial depth electrodes. In addition, we detail three individuals with distinct clinical scenarios in which depth electrodes were helpful and describe our technical approach to implantation and surgery.
Methods:
We retrospectively reviewed 18 pediatric epilepsy patients requiring depth electrode studies who presented at the University of Alberta Comprehensive Epilepsy Program between 1999 and 2010 with medically intractable epilepsy. Patients underwent cortical resection following depth electrode placement according to the Comprehensive Epilepsy Program surgical protocols after failure of surface electroencephalogram and magnetic resonance imaging to localize ictal onset zone.
Result:
The ictal onset zone was successfully identified in all 18 patients. Treatment of all surgical patients resulted in successful seizure freedom (Engel class I) without neurological complications.
Conclusion:
Intracranial depth electrode use is safe and able to provide sufficient information for the identification of the epileptogenic zone in pediatric epilepsy patients previously not considered for epilepsy surgery.
