A Dose Response Study To Evaluate The Minimal Effective Dose Of 0.5% Isobaric Levo Bupivacaine In Continuous Spinal Anaesthesia For Elective Lower Limb Surgeries

This is a prospective single centre interventional dose response study designed to evaluate the minimal effective dose of 0.5 percent isobaric levobupivacaine for continuous spinal anaesthesia in patients undergoing elective intertrochanteric femur surgery.Adult patients scheduled for surgery under continuous spinal anaesthesia will be enrolled.0.5 percent Isobaric Levobupivacaine will be administered intrathecally through a spinal catheter in incremental doses as per the study protocol. The primary objective is to determine the minimal effective dose required to achieve adequate surgical anaesthesia. Secondary objectives include assessment of hemodynamic changes and onset and duration of sensory and motor block and total number of top ups required and incidence of adverse effects during the intraoperative and immediate postoperative period.