Continous Infusion of Nefopam for Patients Undergoing Pancreatoduodenectomy

The goal of this clinical trial is to determine whether continuous nefopam administration, as part of a multimodal analgesia strategy, reduces opioid consumption and improves patient satisfaction after pancreatoduodenectomy. The main questions are: Does nefopam administration reduce opioid consumption after pancreatoduodenectomy? Does nefopam administration reduce postoperative pain levels after pancreatoduodenectomy? Researchers will compare two other analgesic strategies, namely continuous lidocaine infusion and epidural analgesia, to assess whether they lead to better outcomes. Participants will complete the QoR-15 questionnaire and report their pain levels at predefined time points before and after surgery.