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Background Poorly controlled acute pain after surgery is associated with a variety of unwanted postoperative consequences, including patient suffering, distress, myocardial ischemia, prolonged hospital stay and increase of chronic pain. Neuroaxial block is used for postoperative pain management and decrease analgesic use. Objective to compare the analgesic efficacy of both, intravenous and perineural administration of dexamethasone during femoral and sciatic nerve block using bupivacaine in patients undergoing below knee surgeries. Patients and Methods In our study, 50 patients were randomly divided into two equal groups: Group A (Perineural Dexamethasone group) [n = 25]: Those cases received 2ml volume of dexamethasone (8mg) combined with the 20 ml of bupivacaine of 0.5% concentration in each block, followed by injecting 5 ml saline intravenous. Group B (Systemic Dexamethasone group) [n = 25]: Those cases received 2 ml of dexamethasone (8mg) diluted over 3 cm saline in a 5 ml syringe following injection of the perineural 20 ml bupivacaine (0.5%) combined with 2 ml saline to have the same syringe volume for each block. Results Our study showed that onset time for sensory block was (25.39 ± 3.79) mins for systemic group and (18.85 ± 4.11) mins in perineural group with a significant statistical difference (P &amp;lt; 0.001) between both groups as the onset of sensory block in perineural group was significantly shorter than the systemic group and the duration of sensory block was (650.00 ± 62.8) mins in systemic group and (718.52 ± 62.06) mins in perineural group. The duration of sensory block was significantly shorter in systemic group than in perineural group with statistically high significant difference between groups (P &amp;lt; 0.001). Onset time for motor block was (30.61 ± 4.89) mins in systemic group and (27.59 ± 3.31) mins in perineural group. Perineural group had shorter time of onset than systemic dexamethasone group with a significant difference between groups (P = 0.013). The duration of analgesia was significantly longer in perineural group than systemic group (P &amp;lt; 0.001) Conclusion Dexamethasone was seen to be a potent adjunct to local anesthetic to prolong post operative analgesia with negligible side effects &amp; better outcome to the perineural route.

Efficacy of perineural versus systemic dexamethasone in prolonging analgesia after ultrasound guided femoral and sciatic nerve block for patients undergoing below knee surgeries