 2. Epidural analgesia: An epidural catheter will be inserted before induction of anesthesia in a sitting position between T9 and T10 - T12 and L1 vertebrae. A test dose of 4 ml 0.5 bupivacaine will be administered to rule out intravascular injection or subarachnoid or subdural block. Standard general anesthesia will be performed. Thirty minutes before the end of the surgery, patients will be administered a bolus of a mixture of bupivacaine 0.5 3 ml sufentanil 10 mcg 2 ml NS 5 ml followed by a continuous infusion of a mixture containing in 1 ml bupivacaine 0.125 and sufentanil 0.4 mcg at 8 mlh. At the same time patients will have the possibility to use PCA device with morphine, bolus dose 1 mg, lock-out interval 5 min for 3 days at a surgical ICU. Epidural infusion will be stopped 24 hours after surgery. 