The Comparison of Effectiveness Between Epidural Combined Bilateral US TAP Block Versus Epidural Alone for Gynaecology Operation.

The goal of this clinical trial is to compare effectiveness between epidural combined with TAP block versus epidural alone in gynaecology operation participant .The main question\[s\] it aims to answer are: * what is the pain score for both groups * what is the requirement of epidural infusion between the 2 groups Participants will be given general anesthesia for the operation with the epidural insertion prior to induction. Patient will be randomized into epidural plus TAP block or epidural alone for the study. The US TAP block will be given at the end of operation prior to extubation. Researchers will compare pain score, epidural infusion requirment between the two groups.