tokens: Diltiazem ( 30 micrograms / kg / min ) also prevented the decrease in percentage segmental shortening from 34 + / - 14 % to 63 + / - 18 % of the control value ( P < . 05 ) and ST - segment elevation from 4 . 7 + / - 0 . 7 mV to 2 . 1 + / - 0 . 7 mV ( P < . 01 ) at 3 min after ISO infusion with stenosis .