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Chronic headache is common but difficult to treat. Most patients respond poorly to drugs. Nerve block is an effective treatment but has no continuous effect. The pulsed radiofrequency (PRF) technique has been shown to be effective in relieving head pain and extending the effect of nerve block.

journal of pain research

&lt;p&gt;Pulsed Radiofrequency of C2 Dorsal Root Ganglion Under Ultrasound-Guidance and CT Confirmed for Chronic Headache: Follow-Up of 20 Cases and Literature Review&lt;/p&gt;