tokens: Mean arterial pressure was decreased 30 + / - 8 per cent from control with infusion of fenoldopam ( 3 . 4 + / - 2 . 0 micrograms . kg - 1 . min - 1 ) and 34 + / - 4 per cent with infusion of sodium nitroprusside ( 5 . 9 micrograms . kg - 1 . min - 1 ) ( NS ) .