isoproterenol sensitivity was determined as the intravenous dose that increased heart rate by 25 bpm ( cd25 ) and this was increased from 1.8 +/- 0.3 micrograms after placebo to 38.9 +/- 8.3 micrograms after propranolol and 8.3 +/- 1.7 micrograms after atenolol .
C0022245
isoproterenol
C0039231
increased