Electroencephalographic (EEG) Profils for Patients on Intravenous Ketamine.

About This Study

Chronic pain symptoms can lead to sleep and mood disorders, restrict domestic and work activities and have a significant impact on quality of life. The prevalence of chronic pain in the general population varies between 10 and 52% depending on the study, 7% of which is neuropathic pain. Anxiety-depression comorbidities are found in a large number of patients, with harmful consequences on pain since they exacerbate symptoms and their repercussions. Conversely, pain increases psychological distress. Ketamine has been used in the context of depressive episodes for its rapid action. It is also increasingly used in chronic pain due to its ability to regulate the "wind-up" effect, a phenomenon involved in the central hypersensitization that is inevitably present in neuropathic pain of prolonged duration. Several studies have found electroencephalographic (EEG) signatures associated with a good antidepressant response to Ketamine. The frequency, absolute and relative power and cordance of the EEG signal in certain frequency ranges (theta, alpha, beta and gamma) could be useful to guide and adapt therapies for depression and pain.

Conditions Studied

Interventions

• •Ketamine infusion

Eligibility

Inclusion Criteria:

* Patients \> 18 years old
* Eligible for Ketamine infusions in the context of chronic pain refractory to usual therapies
* Patient informed and having expressed his non-objection to participation in this research
* Patient who is not subject to a legal protection measure

Exclusion Criteria:

* Patients under 18 years of age.
* Patients with a contraindication to ketamine.
* Patient opposed to protocol participation
* Pregnant woman
* Patient under legal protection
* Patient not affiliated to a social security scheme