The aim of this randomized trial is to assess the efficacy of analgesia using either thoracic epidural or intravenous infusions for open lumbar infrarenal aortic aneurys repair and compare Numerical Rating Scale (NRS) with Surgical Pleth Index (SPI) for monitoring pain perception postoperatively. Patients received either preemptive thoracic epidural analgesia using either 0,2% ropivacaine with fentanyl or 0,2% bupivacaine with fenthanyl or preemptive intravenous infusion using metamizole and tramadol.
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pain perception intraoperatively
Timeframe: from the skin incision till placement of last suture by the operator, an average of 2 hours