The effect of local anaesthetics on blood pressure volatility IV lidocaine vs epidural anesthesia in patients undergoing colorectal surgery

Interventions: intravenous lidocaine infusion during general anesthesia for colon surgery,combined general and epidural anesthesia for colon surgery;Active Comparator Procedure/Surgery,Active Comparator Procedure/Surgery;IV lidocaine,epidural anesthesia Primary outcome(s): Haemodynamics stability intraoperative period incidence of hypotension Study Design: Randomized