in contrast , when 75 micrograms of nitroglycerin was administered directly into the left main coronary artery of 7 patients , it produced a small increase in great cardiac vein flow ( from 108 +/- 32 to 125 +/- 31 ml/min , p = 0.059 ) , no change in aortic pressure , and no relief of angina .
C1261082
left main
C0018787
cardiac