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Figure 5 Mean changes from baseline in sitting heart rate after GTN administration. Sublingual GTN (500 µg) was administered 1 h after oral sildenafil (50 mg), as indicated by the arrow. Baseline (time 0) is the average of the measurements taken immediately before sildenafil or placebo administration. Values represent mean ± SEM; n = 15; bpm = beats per minute; HR = heart rate; GTN = glyceryl trinitrate.
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