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Figure 1 The effect of nitroglycerin (GTN) treatment on baroreflex sensitivity. The slopes of the relationship between spontaneous changes in systolic blood pressure (SBP) and reflex changes in the immediately following RR interval are presented. Up sequences are presented in the upper panel, while down sequences are presented in the lower panel. Pretreatment values (visit 1, solid lines) are compared with post-GTN treatment (visit 2, dashed lines). Thick lines represent the median value for the group on each visit; thinner lines represent the interquartile range.