Duration of Analgesia in Bier Block for Patients Undergoing Hand Surgery

patients in group a (n = 25) received 2% lidocaine3 mg/kg (maximum, 200 mg) for IVRA and 2 mL NaCl 0.9% IV , patients in group b (n = 25) received 2% lidocaine 3 mg/kg (maximum, 200 mg) plus 8 mg dexamethasone for IVRA and 2 mL NaCl 0.9% IV , and those in group c (n = 25) received 2% lidocaine 3 mg/kg (maximum, 200 mg) plus fentanyl IV