halothane antagonizes the inotropic and chronotropic effects of epinephrine , but increases the incidence of ventricular tachycardia from 6 % to 28 % , and the incidence of premature ventricular excitations from 0 % to 40 % , compared with epinephrine alone .
C0042514
ventricular tachycardia
C0014563
epinephrine