Abdominal Plane Blocks (APB) in Chronic Abdominal Pain (CAP)

APB Steroids treatment: under real time ultrasound guidance, a 100 mm needle is introduced into the specified plane (subcostal TAP for upper abdomen pain, posterior TAP for lower abdomen pain or TQL for flank and lower abdominal pain). Normal saline (10 ml) is used to open the fascial plane (saline hydrodissection). Then 40 mg of depomedrone diluted in 10 ml of 0.25% levo-bupivacaine is injected into the plane. . A total of 80 mg of depomedrone (steroid) will be used.