In this double-blind study from October 4 , 2003 to April 26 , 2004 , 100 patients undergoing CABG with CPB were randomized at four centres to receive intravenous infusions of clevidipine ( 0.2-8gkg ( -1 ) min ( -1 ) ) or NTG ( 0.4 gkg ( -1 ) min ( -1 ) to a clinician-determined maximum dose rate ) from induction of anesthesia through 12hr postoperatively .