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Fig. 6 | The Journal of Headache and Pain

Fig. 6

From: Effects of sildenafil and calcitonin gene-related peptide on brainstem glutamate levels: a pharmacological proton magnetic resonance spectroscopy study at 3.0 T

Fig. 6

Proportion of healthy participants who developed headache after sildenafil, CGRP and placebo. Blue, green and dark grey bars indicate headache. Light grey bars indicate no headache. During the scan sessions (0–4 h), 8 of 13 participants (62%) developed headache after CGRP (P = 0.041, compared to placebo), 8 of 15 (53%) developed headache after sildenafil (P = 0.131, compared to placebo), and 2 of 13 (13%) developed headache after placebo.

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The Journal of Headache and Pain

ISSN: 1129-2377

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