Spinal Versus Epidural Analgesia in Laparotomic Liver Surgery

The purpose of this study is to evaluate the efficacy of spinal analgesia for minor laparotomic hepatectomy compared with epidural analgesia, monitoring visual analog scale (VAS). The investigators expect at least the same post-operative pain control in the two groups (non inferiority of pain control with spinal analgesia compared to epidural analgesia). Second endpoint is to verify whether after spinal analgesia there is a decrease in patient\'s length of hospitalization according to enhanced recovery after surgery (ERAS) principles.