Comparison of the Efficacy of Ultrasound-guided Greater Occipital Nerve Block and Pulsed Radiofrequency Therapy in Chronic Migraine Patients

Exclusion Criteria

• •Patients who had been started on an effective preventive medication within the past three months;
• •Medication-overuse headache;
• •Treatment with peripheral nerve blocks, trigger point injections or botulinum toxin injections within the past three months;
• •Known allergic reaction to local anaesthetics;
• •Pregnancy or nursing;
• •History of another headaches;
• •History of chronic medical conditions (e.g. cardiovascular, hepatic, renal, endocrine);
• •History of other chronic pain syndromes (e.g. low back pain and fibromyalgia).