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Study design was double-blinded, randomized and conducted twice on two separate study days. Headache data were obtained between scan sequences during post drug MRI. Timing of post drug MRI was selected based on previous reports of attacks after CGRP and sildenafil.3
Drug: CGRP and sildenafil; 1H-MRS: proton magnetic resonance spectroscopy; pCASL: pseudo-continuous arterial spin labeling; PCM: phase-contrast mapping; MRI: magnetic resonance imaging.
