High Voltage VS Standard Voltage Radiofrequency in a Patient With Failed Back Surgery Syndrome

patients will be given standard pulsed radiofrequency (PRF) treatment: temperature 42 ℃, frequency 2 Hz, pulse width 20 ms, voltage 37-41 V, time 120 s.

patients will be given standard pulsed radiofrequency (PRF) treatment: temperature 42 ℃, frequency 2 Hz, pulse width 20 ms, voltage 50-90 V, At the beginning, the patient will feel a severe burning sensation in the original pain area, and slowly after the patient tolerates it. Increase the voltage and gradually increase to the maximum voltage that the patient can tolerate (up to 70-90 V) until the end of 900 s.