Introduction The aim of the study was to compare the incidence of acute and persistent postoperative pain following cardiac surgery performed through sternotomy (group S) or lateral thoracotomy (group T) at discharge from hospital, 3 and 6 months after surgery, using a fast track protocol. Methods Patients scheduled for elective cardiac surgery and postoperative fast track approach were prospectively included in the study. All patients were trained how to use the numerical rating scale (NRS (0 = no pain, 10 = worst pain)) to estimate the level of postoperative pain. Induction and maintenance of anaesthesia were performed according to our standard protocol. All patients were transferred to the post anaesthetic care unit with continuous perfusion of Propofol and Remifentanil, where they received a bolus of Piritramid 0.1 mg/Kg and Metamizol 1mg. Postoperative pain management was performed due to our standard multimodal analgesic protocol to achieve NRS Results 202 patients (96 in group S / 106 in group T) were included. There was no loss of patients during follow-up. Demographics of two groups were similar. The type of surgery performed in group S and T were: CABG (60.4% vs 16.6%), isolated valve (20.8% vs 52.8%) and CABG + single valve (0% vs 47.2%). The surgery was longer in group S (219.3±8.7 S vs 175.7±5.7min T (p There was no statistically significant difference in the incidence of pain at hospital discharge, 3 and 6 postoperative months between the two groups (table1). Discussion Our study showed no difference in the incidence of acute and persistent postoperative pain at 3 and 6 months in patients undergoing cardiac surgery with sternotomy or lateral thoracotomy using a fast track protocol.