the chronotropic dose 25 of isoproterenol ( the dose that increases the resting heart rate by 25 beats/min ) , plasma concentration of catecholamines , triiodothyronin and thyroxin , plasma renin activity and aldosterone , hemoglobin , hematocrit and oxyhemoglobin dissociation were measured on the last day of oxprenolol sr intake and 1 , 2 , 3 , 6 and 13 days after abrupt replacement by identical placebo tablets .
C0022245
isoproterenol
C0007412
catecholamines