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Fig. 1 | The Journal of Headache and Pain

Fig. 1

From: Calcitonin gene-related peptide in blood: is it increased in the external jugular vein during migraine and cluster headache? A review

Fig. 1

CGRP levels (pmol/l) in external julular vein during nitroglycerin (NTG)-induced cluster headache. Note that NTG per se did not increase CGRP. At the start of the cluster headache attacks there was no increase in CGRP. At the maximum of attack CGRP increased twofold. Sumatriptan caused a normalization of CGRP levels, redrawn from [21]

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