IRCT201306307984N9 IRCT 2013-09-11 Tehran university of medical sciences, Vice-chancellor for research Comparing the effect of Pulsed and Conventional Radiofrequency celiac plexus neurolysis on Abdominal Cancer Pain Comparing the effect of Pulsed and Conventional Radiofrequency celiac plexus neurolysis on Abdominal Cancer Pain 2012-05-08 anticipated 50 Complete https://irct.ir/trial/8427 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Parallel, Purpose: Treatment. 2-3 Abdominal cancers. Intervention 1: The patients are first divided into 2 groups each containing 25 persons. In the first group or the PRF group, celiac plexus block would be performed under fluoroscopy and sterile condition after placing the patient on prone position on the OR table. All the patients should have IV line and pulse-oxymetry plus blood pressure and ECG monitoring. The target point is on the anterolateral part of the first lumbar vertebrae. After prep and drape of the skin, a skin wheal would be made by injection of Lidocaine 2 %( 5 ml) into the subcutaneous tissues. The C-arm will be placed in 30 degrees ipsilateral oblique position and the 150 mm RF cannula with 10 mm active tip will be introduced in tunnel vision towards the L1 vertebral body. In the lateral view the needle tip should reach 1-2 centimeter in front of the L1 body. Then 2 ml contrast media (Visipaque 270 mg/dl) would confirm the correct position and 5 ml Ropivacaine 0.5 % ( long-acting local anesthetic) would be injected. Afterwards the Radiofrequency waves in the pulsed mode at 42 degrees and for two cycles of 15 minutes would be started with an interval of 30 seconds between the two. Intervention 2: In the second group the same method is used except for the final stage for which the conventional mode with RF cycles of 90 degrees and for 90 seconds will be used twice with an interval of 30 seconds. At the end of the procedure, the patients will be transferred to the recovery room and they will be discharged if no complication occurs after2 hours.