Diffusion Tensor Imaging in Epilepsy With Continuous Spikes and Waves During Sleep

• Conditions: Cryptogenic Epilepsy
• Interventions: Other: Continuous spikes and waves during slow sleep (CSWS)

• Registration Number: NCT03035513
• Lead Sponsor: University Hospital, Clermont-Ferrand

Brief Summary

Continuous Spikes and Waves during Sleep (CSWS) is a rare paediatric epileptic encephalopathy. Even if the correlation between the severity of the epilepsy and the cognitive consequences is well established, the mechanisms involved in epileptic cognitive degradation are complex and poorly understood. In CSWS, there are many arguments for the implication of cortical and subcortical cerebral structures. Among them the thalamus seems to play a crucial role. In fact it is strongly implicated in the sleep and this function is determining for learning. Moreover, it is part of the propagation pathway of generalized forms of epilepsy like absences in animal studies. Unfortunately there is no animal model for CSWS to confirm this theory. In human studies, few cases are caused by thalamic injuries but most of the time conventional MRI is normal. Despite few literature on CSWS, some studies reported abnormal functional connectivity especially in the thalamus.

The investigators hypothesize that the first utilisation of diffusion tensor imaging (DTI) and tractography will be useful in CSWS to confirm the implication of a cortico-thalamo-cortical network showing an abnormal structural connectivity. The investigators will try to determinate if a particular thalamic nucleus is concerned and demonstrate a link between the disease severity (duration and cognitive consequences) and the importance of structural abnormalities.

Using resting state functional MRI (fMRI), the investigators will also try to investigate the default mode network. Its implication was also suggested in the literature.

Detailed Description

Continuous Spikes and Waves during Sleep (CSWS) is a rare paediatric epileptic encephalopathy. Even if the correlation between the severity of the epilepsy and the cognitive consequences is well established, the mechanisms involved in epileptic cognitive degradation are complex and poorly understood. In CSWS, there are many arguments for the implication of cortical and subcortical cerebral structures. Among them the thalamus seems to play a crucial role. In fact it is strongly implicated in the sleep and this function is determining for learning. Moreover, it is part of the propagation pathway of generalized forms of epilepsy like absences in animal studies. Unfortunately there is no animal model for CSWS to confirm this theory. In human studies, few cases are caused by thalamic injuries but most of the time conventional MRI is normal. Despite few literature on CSWS, some studies reported abnormal functional connectivity especially in the thalamus.

The investigators hypothesize that the first utilisation of diffusion tensor imaging (DTI) and tractography will be useful in CSWS to confirm the implication of a cortico-thalamo-cortical network showing an abnormal structural connectivity. The investigators will try to determinate if a particular thalamic nucleus is concerned and demonstrate a link between the disease severity (duration and cognitive consequences) and the importance of structural abnormalities.

Using resting state functional MRI (fMRI), the investigators will also try to investigate the default mode network. Its implication was also suggested in the literature.

Study Timeline

• Status Verified: 2017-01
• Study Start: 2017-01
• Study First Submitted: 2017-01-13
• Study First Submitted QC: 2017-01-27
• Last Update Submitted: 2017-01-27
• Study First Posted: 2017-01-30
• Last Update Posted: 2017-01-30
• Primary Completion: 2020-02
• Study Completion: 2020-02

Recruitment & Eligibility

• Status: UNKNOWN
• Sex: All
• Target Recruitment: 45

Inclusion Criteria

• • for the patients, diagnosis of CSWS according to the current diagnostic criteria (ILAE 2001)
• minimal age of 5 years old
• written consent to participate in the study from the subjects who could write and/or from the parents or legal representative

Exclusion Criteria

• rejection of the patient or its legal representative
• no respect of inclusion criteria

Study & Design

• Study Type: OBSERVATIONAL
• Study Design: Not specified

Arm && Interventions

Group	Intervention	Description
CSWS patients	Continuous spikes and waves during slow sleep (CSWS)	The data of CSWS patients will be statistically compared to healthy volunteers
healthy volunteers	Continuous spikes and waves during slow sleep (CSWS)	The data of CSWS patients will be statistically compared to healthy volunteers

Primary Outcome Measures

Name	Time	Method
Structural connectivity of the thalamo-cortical network	at day 1	Structural connectivity of the thalamo-cortical network will be assessed using DTI fractional anisotropy.; The data of CSWS patients will be statistically compared to healthy volunteers

Secondary Outcome Measures

Name	Time	Method
Some comparisons with electrophysiological and neuropsychological data will be done	at day 1

Trial Locations

Locations (1)

CHU Clermont-Ferrand; 🇫🇷 Clermont-ferrand, France