tokens: The effects of i . v . bolus administration of cromakalim ( 1 - 10 micrograms / kg ) and pinacidil ( 3 - 100 micrograms / kg ) on large ( circumflex artery ) and small coronary arteries and on systemic hemodynamics were investigated in chronically instrumented conscious dogs and compared to those of nitroglycerin ( 0 . 03 - 10 micrograms / kg ) .