Fig. 4From: Effects of sildenafil and calcitonin gene-related peptide on brainstem glutamate levels: a pharmacological proton magnetic resonance spectroscopy study at 3.0 TMean arterial pressure, heart rate and end-tidal CO2 tension after sildenafil, CGRP and placebo. The mean arterial pressure, heart rate and end-tidal CO2 tension were normal on all three study daysBack to article page