Study of the Characteristics of Chronic Pain in Patients With Addiction

Study Overview
=================
Brief Summary
-----------------
It is described in the literature a higher prevalence of pain in patients with an addiction but there are few studies describing the pain profile of patients with use disorder. Pain has a very negative impact on the quality of life of opioid substituted patients. Improving knowledge on this point would make it possible to better guide specific care. The investigator proposes to conduct a single-center descriptive observational study using questionnaires, without changing the management of patients with chronic pain. The primary objective of the study is to determine the prevalence of chronic pain in patients with substance addiction hospitalized for addiction treatment.

Detailed Description
-----------------
It is described in the literature a higher prevalence of pain in patients with an addiction but there are few studies describing the pain profile of patients with use disorder. Pain has a very negative impact on the quality of life of opioid substituted patients. Improving knowledge on this point would make it possible to better guide specific care. The investigator proposes to conduct a single-center descriptive observational study using questionnaires, without changing the management of patients with chronic pain. All patients admitted to hospitalization in the addiction department of the LORIENT Hospital will be offered participation in the study. The primary objective of the study is to determine the prevalence of chronic pain in patients with substance addiction hospitalized for addiction treatment. The study will also evaluate the impact on daily activities of the presence of two chronic pathologies: chronic pain and addiction, describe the frequency of the two main psychiatric comorbidities of chronic pain: anxiety and depression, describe the different components of chronic pain in patients with substance addiction, and get information on analgesic medications.

Official Title
-----------------
Descriptive, Prospective Study of the Characteristics of Chronic Pain in Patients With Addiction to at Least One Substance

Conditions
-----------------
Chronic Pain, Addiction

Participation Criteria
=================
Eligibility Criteria
-----------------
Inclusion Criteria: > 18 years old Presence of addiction to at least one substance, based on DSM-5 criteria Hospitalized in the addiction service of LORIENT Hospital Knowing how to read and write French Not objecting to their participation in the study after informed information Exclusion Criteria: Already included during a precedent hospitalization Adults subject to legal protection or deprived of their liberty.

Ages Eligible for Study
-----------------
Minimum Age: 18 Years

Sexes Eligible for Study
-----------------
All

Accepts Healthy Volunteers
-----------------
No

Study Plan
=================
How is the study designed?
-----------------
What is the study measuring?
-----------------
Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Prevalence of chronic pain in patients with substance addiction hospitalized for addiction treatment. | Percentage of patients presenting with pain for more than three months among patients hospitalized in an addiction service for the management of an addiction | During the hospitalization, maximum 1 month | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Pain intensity in the last 24 hours | Results of the Brief Pain Inventory : worst and least of pain in the last 24 hours | During the hospitalization, maximum 1 month | 
| Interference of pain on the quality of life | Result of Brief pain inventory on general activity, mood, walking ability, normal work, relations with other people, sleep, enjoyment of life. On a scale from 0 (does not interfere) to 10 (completely interferes) | During the hospitalization, maximum 1 month | 
| Localisation of pain | Drawing on a diagram of a human body | During the hospitalization, maximum 1 month | 
| Describe the frequency of the two main psychiatric comorbidities of chronic pain: anxiety | Results of the anxiety scale of Hospital Anxiety and Depression scale. Positive if > 8. Minimum 0, maximum 21 | During the hospitalization, maximum 1 month | 
| Describe the frequency of the two main psychiatric comorbidities of chronic pain: depression | Results of the depression scale of Hospital Anxiety and Depression scale. Positive if > 8. Minimum 0, maximum 21 | During the hospitalization, maximum 1 month | 
| Describe the prevalence of fibromyalgia among patients with substance addiction | Results of the Fibromyalgia Rapid Screening Tool. Suspicion of fibromyalgia if >5 yes. Maximum 6 yes | During the hospitalization, maximum 1 month | 
| Information on analgesics medication | Collection of current analgesic medication taken every day | During the hospitalization, maximum 1 month | 
| Describe the prevalence of neuropathic pain among patients with substance addiction | Results of the DN3 (neuropathic pain 3). Suspicion of neuropathic pain when > 3/7 | During the hospitalization, maximum 1 month |