Type of Anaesthesia Preoperative normal QTc &postoperative normal QTc Preoperative normal QTc &postoperative prolonged QTc Totals General Anaesthesia 65 (Group 2) 61 (Group 1) 126 Regional Anaesthesia or MAC 29 (Group 4) 13 (Group 3) 42 Total 94 74 168

Table 1: Distribution of patients according to type of anaesthesia and perioperative QTc interval changes.