tokens: After the control ISO infusion with stenosis was performed , equihypotensive doses of CD - 832 ( 3 and 10 micrograms / kg / min , n = 7 ) , nifedipine ( 1 and 3 micrograms / kg / min , n = 9 ) or diltiazem ( 10 and 30 micrograms / kg / min , n = 7 ) were infused 5 min before and during the second and third ISO infusion .