to determine the systolic functional response of the aged left ventricle to catecholamines , 16 healthy , physically active subjects aged 62 to 72 years ( group a ) and 19 healthy adults aged 18 to 28 years ( group b ) were evaluated before and during infusion of 8 micrograms/kg/min of dobutamine .
C0007412
catecholamines
C0012963
dobutamine