This is a retrospective and transverse multicenter study to identify predictive factors for adherence to TENS by chronic pain patients followed in structures specialized in Chronic Pain management (SPC). The study contains 2 parts: * A retrospective part of data collection in the patient follow-up file of the SPC during the 6 months elapsed after the first rental prescription. * A transversal part, aimed at collecting additional information on the use of TENS, satisfaction and quality of life during a telephone interview after 6 months of use.
Study Type
OBSERVATIONAL
Enrollment
500
Patients must fill questionnaires to collect socio-demographics, aetiology and characteristics of pain, efficacy and tolerance regarding the TENS. Study sites must fill questionnaires to collect information regarding the type of pain management centre, the characteristics of the clinician, the characteristics of the TENS prescribed.
Determination of predictive factors explaining compliance to TENS.
Compliance is evaluated on a 6 month period prior to the inclusion. Compliant patients to TENS are defined as having 0, 1 or 2 to score of Morisky Medication Adherence Scale. Factors which can explain the lack of compliance will be collected and categorized within "pain centre", "clinician", "TENS characteristics", "patient socio-demographics", "aetiology and characteristics of pain", "efficacy and tolerance" data.
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient
Efficacy parameters: follow up visits
Efficacy parameters: Rate of patients followed at 1, 3 and 6 months after the initiation session to TENS and rate and time of premature discontinuation of treatment.
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient at the following timepoints: T1month, T3month, T6month
Efficacy parameters: observance
Rate of observant patients at 1, 3 and 6 months after the TENS initiation session.
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient at the following timepoints: T1month, T3month, T6month
Efficacy parameters: pain intensity
Pain intensity (PI) collected using an 11 point digital scale (EN) (0 - 10, 0 = no pain; 10 = maximum pain imaginable) during the first contact with the investigator/nurse (D0) (patient record), then 1, 3 and 6 months after the TENS initiation session (patient record) and during the 8 days preceding the last use of TENS.
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient at the following timepoints: TENS initiation, T1month, T3month, T6month and on a 8-day period preceding the last use of TENS
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Efficacy parameters: Pain intensity differences
Pain intensity differences (PID) on the average intensity scores at 1, 3 and 6 months after the TENS initiation session and during the 8 days preceding the last use of TENS (PI inclusion - PI T-time).
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient at the following timepoints: TENS initiation, T1month, T3month, T6month and on a 8-day period preceding the last use of TENS
Efficacy parameters: Sum of Pain intensity differences
Sum of pain intensity differences (SPID) on the average intensity scores at 1, 3 and 6 months after the TENS initiation session and during the 8 days preceding the last use of TENS, weighted on the time factor: SPID0-Xmonth = Σ \[T (i) -T (i-1)\] xPID (i).
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient at the following timepoints: TENS initiation, T1month, T3month, T6month and on a 8-day period preceding the last use of TENS
Efficacy parameters: punctual relief
Relief (PAR) using an 11-point numeric scale (0% -100%, 0 = no relief; 100% = complete relief) at 1, 3 and 6 months (patient record) after the introduction to TENS and during the 8 days preceding the last use of TENS.
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient at the following timepoints: TENS initiation, T1month, T3month, T6month and on a 8-day period preceding the last use of TENS
Efficacy parameters: Total relief
Total relief (TOTPAR) or TOTPARt0-tx = Σ \[T (x) -T (x-1)\] xPAR (x) when T (0) = 0, T (x) is the selected evaluation time and PAR (x) is the PAR value at the times 1, 3 and 6 months after the TENS initiation session and during the 8 days preceding the last use of the TENS
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient at the following timepoints: TENS initiation, T1month, T3month, T6month and on a 8-day period preceding the last use of TENS
Efficacy parameters: Quality of life
Quality of life questionnaire (EQ-5D) when TENS was last used.
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient at the following timepoints: on the day of the last use of TENS
Efficacy parameters: Impression of change
Patients' Global Impression of Change (PGIC) when the TENS was last used.
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient at the following timepoints: on the day of the last use of TENS
Efficacy parameters: Satisfaction
Satisfaction when TENS was last used.
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient at the following timepoints: on the day of the last use of TENS
Efficacy parameters: wish for continuation
Number of patients wishing to continue treatment and purchase the device
Time frame: Data are collected the day of the inclusion.
Mode of use of the TENS
For each of the 4 TENS allowed in the study, description of the program used and collection of the duration of use, the number of sessions per day and the duration of the post-effect as well as compliance with the instructions for use of the TENS during follow-up.
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient.
Tolerance parameters: AEs
Number, delay of onset and type of serious and non-serious AEs (SAEs) occurring during the 6 months of follow-up and attributable, according to the opinion of the investigator, to treatment.
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient.
Tolerance parameters: premature discontinuation
Number of premature discontinuations before 6 months for tolerance problems
Time frame: Data are collected the day of the inclusion retrospectively on a 6 month period prior to the inclusion of each patient.