NENUFAR: Contribution of Fast-ripples to the Improvement of the Neurosurgical Management of Drug-refractory Epilepsy

Sponsor

University Hospital, Toulouse (Other)

Overall Status

Not yet recruiting

CT.gov ID

NCT06105645

Collaborator

Centre de recherche Cerveau et Cognition (CERCO) (Other), Dixi Medical (Other)

440

Enrollment

Location

Arms

Anticipated Duration (Months)

5.9

Patients Per Site Per Month

Study Details

Study Description

Brief Summary

The main aim of this study is to evaluate the contribution of fast-ripples (FR) information on the neurosurgery management of patients with drug-refractory epilepsy investigated by Stereo-ElectroEncephaloGraphy (SEEG), as measured by freedom from disabling seizures one-year post-surgery.

220 patients (for whom 4-6 usual clinical macro-electrodes will be replaced by hybrid micro-macro electrodes and for whom fast-ripples will be assessed) distributed over 5 centres and 220 control patients(who will undergo an SEEG with the usual electrodes and for whom fast-ripples will not be assessed) distributed over 6 centres. This is a controlled, non-randomized, parallel plan, prospective, multicentre exploratory study.

Condition or Disease	Intervention/Treatment	Phase
Epilepsy	Device: DIXI Medical Microdeep® Micro- Macro Depth electrodes Device: Standard electrodes	N/A

Detailed Description

This is a controlled, non-randomized, parallel plan, prospective, multicentre exploratory study. The design of the study relies on two groups of patients benefiting from a SEEG, equivalent in size: one with standard and hybrid electrodes for which fast-ripple information will be available for the neurosurgery decision, the other, who will serve as a control group, with standard electrodes only and for which no information regarding fast-ripples will be provided. For all patients undergoing SEEG, the decisions about eligibility to epilepsy surgery and, if eligible, about the best surgical plan, are taken during a multidisciplinary epilepsy meeting (MEM) within the 4 +/- 2 months following the SEEG. In the group of patients with standard and hybrid electrodes, the procedure as extensively tested previously, is to plan the implantation of the standard electrodes as usually done, and once done, to replace from 4 to 6 standard electrodes with hybrid electrodes. In this group, intracerebral ElectroEncephaloGraphy (EEG) data will be acquired for detection of fast-ripples, during one hour of a rest period for 2 days during the first week of SEEG, as well as during one cycle of night sleep when possible. Fast-ripples(number, localization and characteristics) for all these patients will be analysed by an expert group of neuroscientists based in Toulouse blind to the analysis of the Epileptogenic Zone (EZ), irritative and propagation zones and on all micro- and macro contacts, to the participating centre and to the period of recording. The results of the fast-ripple assessment will be provided to the clinicians on time for the MEM. They will incorporate this information along other usual clinical information gathered during the SEEG to reach a conclusion regarding the possibility of a neurosurgery. No analysis of the fast-ripples will be performed in the other group of patients with standard electrodes only. In this group, the conclusion regarding the possibility of a neurosurgery will thus be done during the MEM with the standard clinical information gathered during the SEEG only. Following epilepsy surgery, the typical follow-up performed in routine in all participating centres includes a clinical evaluation one year after surgery, during which Engel class is assessed.

Study Design

Study Type:

Interventional

Anticipated Enrollment :

440 participants

Allocation:

Non-Randomized

Intervention Model:

Parallel Assignment

Masking:

None (Open Label)

Primary Purpose:

Other

Official Title:

Contribution of Fast-ripples to the Improvement of the Neurosurgical Management of Drug-refractory Epilepsy

Anticipated Study Start Date :

Jan 1, 2024

Anticipated Primary Completion Date :

Apr 1, 2030

Anticipated Study Completion Date :

Apr 1, 2030

Arms and Interventions

Arm	Intervention/Treatment
Experimental: Arm with fast-ripples information Patients for whom 4-6 usual clinical macro-electrodes will be replaced by hybrid micro-macro electrodes and for whom fast-ripples will be assessed	Device: DIXI Medical Microdeep® Micro- Macro Depth electrodes It is a deep intracerebral electrode used in the pre-surgical diagnosis of certain drug-resistant epilepsies. It consists of micro- and macro-contacts and is designed for Stereo-ElectroEncephalography (SEEG) recording via the macro-contacts or micro-contacts and brief stimulation via the macro-contacts.
Active Comparator: Arm without fast-ripples information Patients who will undergo an SEEG with the usual electrodes and for whom fast-ripples will not be assessed.	Device: Standard electrodes Standard electrodes used usually during the SEEG

Arm

Intervention/Treatment

Experimental: Arm with fast-ripples information

Patients for whom 4-6 usual clinical macro-electrodes will be replaced by hybrid micro-macro electrodes and for whom fast-ripples will be assessed

Device: DIXI Medical Microdeep® Micro- Macro Depth electrodes

It is a deep intracerebral electrode used in the pre-surgical diagnosis of certain drug-resistant epilepsies. It consists of micro- and macro-contacts and is designed for Stereo-ElectroEncephalography (SEEG) recording via the macro-contacts or micro-contacts and brief stimulation via the macro-contacts.

Active Comparator: Arm without fast-ripples information

Patients who will undergo an SEEG with the usual electrodes and for whom fast-ripples will not be assessed.

Device: Standard electrodes

Standard electrodes used usually during the SEEG

Outcome Measures

Primary Outcome Measures

Contribution of fast-ripples information on freedom seizures [12 months after epilepsy surgery]
Proportion of patients with Engel class I after one-year post-surgery in the group of patients with information of fast-ripples compared to patients without.

Secondary Outcome Measures

Contribution of fast-ripples information on improvement of epilepsy [12 months after epilepsy surgery]
Proportion of patients with Engel classes I to III one-year post-surgery of patients with information of fast-ripples compared to patients without.
Contribution of fast-ripples information on patients addressed to neurosurgery [12 months after epilepsy surgery]
Proportion of patients operated for their epilepsy in the group of patients with information of fast-ripples compared to patients without.
Adverse effects related to Stereo-electroencephalography [Day 0 (SEEG visit)]
Quantitative and qualitative description of adverse effects related to the Stereo-electroencephalography (SEEG) in the group of patients with information of fast-ripples compared to patients without.
Adverse effects of epilepsy surgery [6 months after surgical decision]
Quantitative and qualitative description of adverse effects related to epilepsy surgery in the group of patients with information of fast-ripples compared to patients without.
Adverse effects of hybrid electrodes [Day 0 (SEEG visit)]
Quantitative and qualitative description of adverse effects related to the hybrid electrodes.
Post-operative neurological deficit [12 months after epilepsy surgery]
Number of patients suffering from disabling post-operative neurological deficit, anxiety or depression in the group of patients with information of fast-ripples versus patients without
Evolution of quality of life using the score of Quality of life Epilepsy Inventory Epilepsy Inventory [12 months after epilepsy surgery]
Delta of quality of life using the score of Quality of life Epilepsy Inventory (QOLIE-31) between baseline and 12 months related to epilepsy surgery in the group of patients with information of fast-ripples compared to patients without. QOLIE-31 is a 31-item questionnaire with different proposal scores. The maximal total score is 100 : the higher the score, the better the quality of life
Level of satisfaction [12 months after epilepsy surgery]
Mean of level of satisfaction with the outcome of epilepsy surgery assessed using the Evaluation of changes in daily life after epilepsy surgery (EVOCQUE) self-questionnaire, 12 months after surgery, related to epilepsy surgery in the group of patients with information of fast-ripples compared to patients without. EVOCQUE is a self-questionnaire with ten different questions and proposal scores.
Recording of fast-ripples [Day 0 (SEEG visit)]
Number of fast-ripples recorded on the hybrid electrodes, on the one hand on the micro- contacts and on the other hand on the adjacent macro-contacts of the same hybrid electrode.
Distribution of the fast-ripples [Day 0 (SEEG visit)]
Number of fast-ripples in the Epileptogenic Zone, Irritative Zone and healthy zone
Number of fast-ripples recorded according to the period [Day 0 (SEEG visit)]
Number of fast-ripples recorded during one period of sleep, an equivalent period of nap and an equivalent period of sitcom watching.

Eligibility Criteria

Criteria

Ages Eligible for Study:

18 Years to 65 Years

Sexes Eligible for Study:

All

Accepts Healthy Volunteers:

Inclusion Criteria:

Patient suffering from drug-resistant focal epilepsy (DRFE), as defined by the International League Against Epilepsy, undergoing SEEG, the indication of which was selected during a multidisciplinary epilepsy meeting
Patient who has given written informed consent to allow the study data collection procedures
Patient covered by the French healthcare system.

Exclusion Criteria:

Patients under juridical protection (authorship, curators or safeguarding of justice).
Patient deprived of liberty by a judicial or administrative decision
Patient with a cardiac defibrillator
Thermocoagulation planned on one of the potential hybrid electrodes .
Patient in exclusion period of another study.
No other non-inclusion criteria since the study will only be proposed to patients who already meet the criteria for a SEEG