Clinical trial NCT02932839: Investigating the Neuronal Bases of Epilepsy With Micro-electrode Arrays in Candidates for Epilepsy Surgery
Official title: Investigating the Neuronal Bases of Epilepsy With Micro-electrode Arrays in Patients Who Are Candidates for Epilepsy Surgery
Study type: INTERVENTIONAL
Overall status: COMPLETED
Phase: NA
Conditions: Epilepsy
Keywords: Epilepsy surgery
Micro-electrode arrays
Single-neuron recordings
Electrocorticography
Lead sponsor: Wyss Center for Bio and Neuroengineering
Sponsor class: OTHER
First posted: 2016-10-13
Enrollment: 3
Sex: ALL
Minimum age (years): 18
Standard ages: ADULT
OLDER_ADULT
Accepts healthy volunteers: no
Allocation: NA
Intervention model: SINGLE_GROUP
Primary purpose: BASIC_SCIENCE

Brief summary: This study aims to uncover the neuronal bases of epilepsy by recording the activity of single neurons in the brain of patients with epilepsy who are candidates for assessment with intracranial electroencephalography (EEG). A micro-electrode array will be inserted into the brain in addition to the standard intracranial EEG electrodes for up to 4 weeks.

Detailed description: Epilepsy is a disease characterized by the tendency to have seizures, which are thought to be due to excessive activity in the neurons of the brain. However, it is technically difficult to record the activity of neurons, especially in the brain of human patients. Therefore, there are gaps in what scientists know of what exactly goes wrong in neurons during epileptic seizures.

In this study, an array of micro-electrodes will be inserted into the brain of patients with epilepsy while they are undergoing a clinically indicated assessment with intracranial electroencephalography (EEG). The micro-electrode array is able to continuously record the activity of neurons in the human brain. In combination with the standard intracranial EEG, the recordings of the micro-electrode array will allow a better understanding of the relationship between epileptic seizures and the activity of neurons.

Eligibility criteria: Inclusion Criteria:

* Patient 18 years old or older
* Patient who suffers from potentially surgically remediable drug-resistant focal epilepsy
* Patient in whom neocortical resective surgery is deemed likely
* Patient who requires evaluation with intracranial subdural EEG electrodes
* Patient in whom a cortical area that is not eloquent (i.e. not involved in a critical neurological function like language or motor control) is deemed highly likely to be involved in seizure onset or propagation and is therefore an appropriate site for the implantation of the micro-electrode array
* Patient who is able and willing to provide informed consent

Exclusion Criteria:

* Patient in whom neocortical resective surgery is deemed unlikely (e.g. patients in whom a corpus callosotomy or another palliative epilepsy surgery procedure is planned)
* Patient who will be investigated with stereo-EEG electrodes only (these patients will not undergo a craniotomy for clinical purposes, and implantation of the micro-electrode array is therefore impossible)
* Patient whose epileptic seizures cause hypermotor or violent motor behavior (due to the risk of MD mechanical failure and related injury)
* Patient with a previous history of bacterial meningitis (due to the risk of thickening of the arachnoid membrane complicating the implantation of the micro-electrode array)
* Patient with severe psychiatric disease or psychological distress
* Patient with severe concomitant medical disease (including, but not limited to, cardiovascular disease, respiratory illness, renal failure, hepatic dysfunction, etc.)
* Patient with known compromise of the immune system caused by a medical condition or the chronic consumption of immunosuppressant medication (due to the increased risk of infection; this includes diabetes mellitus)
* Patient with colonization with methicillin-resistant Staphylococcus aureus (due to the increased risk of difficult-to-manage infection)
* Patient with known tendency for increased bleeding (due to the increased risk of hemorrhage)
* Patient with an implanted intracranial stimulator, vagus nerve stimulator, or cochlear implant that will remain active during the study (due to the potential for interference with the micro-electrode recordings)
* Women who are pregnant or breastfeeding during the study

Primary outcomes:
measure: Number of participants with study procedure- and investigational device-related serious adverse events, as defined in ISO 14155
timeFrame: On average 4 weeks
measure: Correlation between EEG markers of epileptic activity and single-neuron activity recorded by the investigational device
timeFrame: Up to 4 weeks
Secondary outcomes:
measure: Number of single neurons recorded from investigational device
timeFrame: Up to 4 weeks
Other outcomes:
Locations:
city: Geneva
country: Switzerland
facility: Hôpitaux Universitaires de Genève
Study officials:
affiliation: University Hospital, Geneva
name: Margitta Seeck, MD
role: PRINCIPAL_INVESTIGATOR
References: