positive inotropic and chronotropic responses to dm9278 in both atrial and ventricular preparations were suppressed slightly but not significantly by 1-3 micrograms of propranolol , which completely blocked the positive chronotropic and inotropic effects of norepinephrine ( 0.01-0.1 micrograms ) .
C1372804
positive chronotropic
C0028351
norepinephrine