SPG Pulsed Radiofrequency for Chronic Cluster Headache

After the puncture needle reached the sphenopalatine ganglion (SPG), patients in the PRF group received PRF treatment in automatic mode for 360 s, at a maximum of 42°C, pulse frequency of 2 Hz, and pulse width of 20 ms.

After the puncture needle reached the sphenopalatine ganglion (SPG), patients in the NB group received nerve block with a mixture of 40 mg of triamcinolone and 2 ml of 0.75% bupivacaine with 2 ml of normal saline and 1:100000 epinephrine.