Clinical Comparative Study Aiming to Evaluate Postoperative Effect of Using Intrathecal Dexmedetomidine and Fentanyl as an Adjuvant to Heavy Bupivacaine in Lower Limb Vascular Surgeries on Pain Intensity, Analgesic Requirement and Shivering. Patients and Methods After Approval of Medical Institution

Spinal anaesthesia is an excellent choice of numerous operating procedures. This is due to its effectiveness, rapid onset of action, easy to implement, patient stayed awake, and minimal drug cost.(1) It is also beneficial for patients with chronic airway disorders, reducing the risk of pulmonary aspiration and vomiting in patients with full stomach, as well as its fewer adverse effects, and speedy patient turnover. (2,1) In lower abdominal and lower limb surgeries, spinal anaesthesia is still the primary option. (3) The resultant nerve block is sufficient for patient welfare, while motor block eases the surgeon's work. Moreover, it grants efficient pain relief in the early post-operative period. (2) Yet, postoperative analgesia is a most important dilemma. (4) Thus, additional pain control is essential after spinal anaesthesia effect fades. Consequently, effective analgesia is crucial to accelerate rehabilitation and return to proper functional ability. Post-operative analgesia can be accomplished by numerous approaches specifically systemic opioid and non-opioid, local wound infiltration and peripheral nerve blocks, each approach have its own advantages and drawbacks.