Study Evaluating the Efficacy of Loco-regional Anaesthesia PECS on Chronic Pain of a Mastectomy (PECS)

Study Evaluating the Efficacy of Loco-regional Anaesthesia PECS on the Rate of Chronic Pains 6 Month After a Mastectomy Associated or Not With Axillary Node Dissection and/or a Reconstruction Prosthesis.

A non-randomized, mono-centric, prospective interventional study that will assess the efficacy of the loco-regional anesthesia PECS on the rate of chronic pain, 6 month after a patient will have either received a mastectomy or a mastectomy associated with axillary nodes dissection, and/or a reconstruction by prosthesis.

The aim of this study is to assess the care given to treat breast cancer while the patient receives a total mastectomy. It is done by evaluating the technique of anesthesia PECS used during this procedure so that the rate of chronic pain can be measured 6 month after the operation. As well as total mastectomy, patients are also eligible for an axillary lymph node dissection (ALND) and a reconstruction of the breast by prosthesis as options. Other objectives of the study include: Evaluating the effectiveness of the PECS anesthesia technique on the trajectory of acute post-operative pain and on chronic pain after 12 month of the surgery Evaluating the type and intensity of the pain Evaluating the quality of life Study the link between chronic pain and the trajectory of acute pain.

Loco-regional anaesthesia Anesthesia technique used : loco-regional PECS for patients requiring Mastectomy; And/or Axillary node dissection ; And/or Reconstruction of breast by prosthesis

The rate of chronic pain will be assessed in percentage (%) based on the criteria of the International Association for the Study Pain (IASP) during an algology medical consultation.

A representation of the trajectory of pain in the 3 days will be drawn. This pain trajectory is defined as the kinetics of the average daily visual analog scale (VAS) score for 3 days.

All side effects (e.g. nausea, vomiting etc.) will be recorded, with its date, time, severity, relation with the treatment, treatment associated and evolution. The intensity of adverse events will be scored using the criteria from NCI-CTCAE version 4.0.

Assessed based on the criteria of the International Association for the Study Pain (IASP) collected via telephone call.

The type of chronic pain will be determined using the DN4 score. The DN4 score is a form used for the diagnostic of neuropathic pain.

QLQ-C30 from the EORTC (quality of life in general, physical condition, limitations to activities, cognitive functions, emotional and social and symptoms occurrences related to cancer or the treatment)

Inclusion Criteria: Patients with unilateral breast cancer Surgery must be a total mastectomy +/- axillary lymph node dissection and +/- reconstruction by prosthesis; unless first surgery was performed more than 5 years prior to total mastectomy without any residual pain Age ≥ 18 ans Non-opposition of patients Exclusion Criteria: Reconstruction by other than prosthesis Previous breast surgery in the last year Hypersensitivity or allergy of anaesthetics Coagulopathy and local infections Pregnant or breastfeeding Patients under guardianship