After taking pain relief in all three groups, 1 hour since beginning, the resting VAS scores of all three groups fell below 4 points, of which CEA group has the best reduction with the average VAS score at H1. The resting VAS scores for all three groups decreased of which the average of CWI group was 2, 35 ± 1, 12, PCA group was 2, 48 ± 0, 98, CEA group was 2, 2 ± 0, 81.