Abstract
Dear Sir I read with great interest the article of Peres et al. (1) on the effect of ‘Greater occipital nerve blockade for cluster headache’ and a recent letter to the editor (2). There is more precision in a subsequent publication by Dr M. Anthony (3) on the effect of blockade of the greater occipital nerve. He injected local anaesthetic during cluster attack on 20 patients and headache stopped for 16 of them. He injected local anaesthetic into 10 of the 20 patients outside attack and headache returned to 10 of them in the next 24 h. He injected depomedrol (160 mg, i.m.), the same dosage as he injected around the occipital nerve, in 10 patients and headache returned to 10 of them. This information does not give definite proof of the positive effect of occipital nerve blockade in cluster headache but we get closer than what is suggested in the letter.