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Similar forearm vasoconstriction to norepinephrine (NE) 480 pmol/min is depicted after sildenafil (open bar) and placebo (filled bar) administration (P = 0.62) (left side). Similar forearm vasodilation to NE 480 pmol/min coinfused with phentolamine (PHEN) 120 mcg/min is depicted after sildenafil (open bar) and placebo (filled bar) administration (P = 0.20) (right side).
