In this clinical study, the investigators will justify the current practice of combined continuous caudal epidural with general anaesthesia in adult patients undergoing lumbar fixation versus general anaesthesia. Furthermore, the investigators will determine the analgesic requirement, rescue analgesia, hemodynamic changes and possible complications with continuous caudal epidural analgesia.
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Determining the total amount of fentanyl that will be consumed as intra operative analgesia
Timeframe: during intraoperative period (from induction of anesthesia until recovery from general anaesthesia)