the magnitude of heart rate reduction was also greater after propranolol in responders ( from 101 +/- 14 to 80 +/- 9 beats/min , p less than 0.001 ) than in nonresponders ( from 86 +/- 11 to 74 +/- 9 beats/min , p less than 0.01 ) ( p less than 0.05 between the groups ) , despite equal plasma propranolol concentrations ( 84 +/- 50 vs 88 +/- 43 ng/ml , difference not significant ) .
C0428977
heart rate reduction
C0033497
propranolol