The use of a peripheral nerve block (PNB) through local anesthetics administered may exacerbate the acute inflammatory process induced by the surgical trauma, which may cause rebound pain once the block is lifted, also called "Rebound pain" (RP).
The administration of a dose of Dexamethasone (DEXA) IV as an adjuvant, to optimize the effectiveness of PNB by increasing the duration of PNB , is already a validated practice in anesthesia. In addition the well known analgesic effects of DEXA on postoperative pain (dose\> 0.1 mg/kg) seem to contribute to the decrease in RP occurring in the first 24 hours after surgery . These protective properties of DEXA with respect to this phenomenon of hyperalgesia could be explained, among other things, by its modulatory actions on the inflammatory reaction and inhibitory actions on cyclooxygenase as well as its effect on the production of specific mediators such as cytokines.
However, even if DEXA can reduce the onset of RP in some patients, its efficacy seems to be variable and inconsistent between individuals, as suggested by the results of a retrospective observational study .
It can thus be assumed that some individuals are less sensitive to the preventive administration of DEXA and this for different reasons that it would be interesting to better understand .
Objectives:The primary objective will be to identify factors predisposing to variations in the efficacy of DEXA on the occurrence of RP by characterizing the basal stress state of the patient, the level of anxiety and pre-existing catastrophism, as well as the basal thresholds of Lipocortin 1 and cortisol and the basal inflammatory degree (CR high sensitivity) The secondary objective will be to evaluate the interindividual variability of the preventive efficacy of pre-incisional systemic administration of an anti-inflammatory dose of DEXA (0.1 mg/kg, 10 mg maximum) on the occurrence of RP during axillary block removal.
Method: Patients scheduled for elective upper extremity surgery will receive an axillary nerve block. An intravenous injection of DEXA 0.1mg/kg preoperatively will be offered to all patients included in the study. The PNB will be performed under real-time ultrasound guidance by a competent anesthesiologist using a local anesthetic solution of MEPIVACAINE 1%, for volumes administered varying between 15 and 30 ml (maximum 400 mg, 5-6 mg/Kg). The intensity, the neuropathic or catastrophic character of the pain as well as the preoperative anxiety will be collected through specific questionnaires (APAIS /Catastrophisation /CSI /NLR...). In addition, salivary samples of free cortisol and Lipocortin 1 and blood samples (CRP hs and NLR) will be collected before the PNB is performed. All patients will receive, if necessary, an adapted analgesia in the postoperative period and in the recovery room. Patients will be discharged with a standardized analgesic treatment. Patients will be followed up according to the study protocol established in the PACU (recovery room) at D1 to D4 D30 and at 3 months postoperatively (by telephone calls).
