tokens: When circumflex artery blood flow was maintained constant , the increases in CxAD induced by cromakalim ( 10 micrograms / kg ) , pinacidil ( 30 micrograms / kg ) and nitroglycerin ( 10 micrograms / kg ) were reduced by 68 + / - 7 , 54 + / - 9 and 1 + / - 1 % , respectively .