Prospective multicenter cohort to determine patient profiles (associated factors, including allodynia) with a better response to pain desensitization by capsaicin delivered in the form of a high concentration patch (8%), in a population of patients with peripheral neuropathic pain and followed up in a pain consultation in the Auvergne Rhône Alpes region.
Patient over 18 years of age on the day of inclusion
Patient who has been informed and has not expressed opposition to participating in the study,
"Neuropathic Pain 4" score ("DN4" score) ≥ 4/10
AND pain according to the numerical scale (EN) > 4/10,
None
Eligible patients are identified during consultations for the treatment of their pain, carried out in the Chronic Pain Structures of the Auvergne Rhône-Alpes region. These patients must present peripheral neuropathic pain, whatever the etiology, and validated by a DN4 score ≥ 4/10 and a pain scale \> 4/10, with a stable analgesic treatment for at least one month and for whom the investigator proposes a desensitization to high concentration Capsaicin. Inclusion of consecutive patients in a consultation/day hospitalization setting.
Cohort
Prospective
Questionnaires
Other interventionIn current practice, capsaicin patch treatment is offered to patients with a 24-hour average pain level measured by the EN numerical scale : EN scale is \> 4 Pain monitoring questionnaires will be completed by patients every 6 weeks : Neuropathic Pain Symptom Invetory (NPSI Score), Patients' Global Impression of Change (PGIC scale), Numerical pain scale
Factors (profiles) associated with a better initial response to pain desensitization by capsaicin
A patient is a responder if he has a reduction in pain, as measured by a numerical pain scale, of at least 30% from baseline. The scale used is "EN - échelle numérique" in french, "NRS - Numerical Rating Scale" in english, between 0 and 10 (0 being the absence of pain and 10 the most intense pain).
Proportion [95% Confidence Interval (CI)] of patients "responder at 30%" at 1.5 months after each consecutive patch (e.g. at M4.5 for a second patch applied at M3)
Proportion [95% CI] of patients "initial responder" at 50%
Distribution of Neuropathic Pain Symptom Inventory (NPSI) score values over time: at inclusion, 3 months, 6 months, 9 months,12 months, and between inclusion and the end of follow-up
The NPSI scale is composed of 12 questions (10 descriptive questions of symptoms and 2 to evaluate the frequency and duration of pain). The score for the descriptive questions is between 0 and 100 (0 being the absence of pain and 10 the most intense pain).
Distribution of NPSI subscores values (Q8, Q9, Q10) over time: at inclusion, 3 months, 6 months, 9 months,12 months, and between inclusion and the end of follow-up
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