The study will evaluate pain and recovery after a single injection axillary plexus block combined with an intravenous dose of 0.1 mg/kg dexamethasone in ambulatory patients undergoing upper extremity bone surgery. The investigators will try to identify the risk factors involved in a decrease in the efficacy of dexamethaxone for the prevention of RP. The hypotheses are that : * The interindividual variability may modulate the preventive effect on "rebound pain" after axillary block, of pre-incisional administration of an anti-inflammatory dose of dexamethasone (0.1 mg/kg max 10 mg). * Patients with increased preoperative anxiety or underlying catastrophizing will experience more postoperative pain as the axillary PNB dissipates. * Elevated preoperative salivary lipocortin 1 and cortisol levels result in a lesser preventive effect of dexamethasone on the development of rebound pain.
See this in plain English?
AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Impact of sexe on the efficacy of DEXA on the occurrence of RP
Timeframe: Through study completion, an average of 1 year
Impact of BMI on the efficacy of DEXA on the occurrence of RP
Timeframe: Through study completion, an average of 1 year
Impact of preoperative anxiety levels on the efficacy of DEXA on the occurrence of RP
Timeframe: Through study completion, an average of 1 year
Impact of preoperative levels of pre-existing catastrophizin on the efficacy of DEXA on the occurrence of RP
Timeframe: Through study completion, an average of 1 year
Impact of preoperative levels of central sensitization on the efficacy of DEXA on the occurrence of RP
Timeframe: Through study completion, an average of 1 year
Impact of baseline levels of Lipocortin 1 and cortisol on the efficacy of DEXA on the occurrence of RP
Timeframe: Through study completion, an average of 1 year