ratios of doses causing a 50 % inhibition of tachycardia to that on hypotension induced by isoprenaline were as follows : d-32 ( 0.69 ) , propranolol ( 0.67 ) , atenolol ( 0.03 ) and ips-339 ( 6.3 ) .
C0039231
tachycardia
C0022245
isoprenaline